704 lines
21 KiB
JavaScript
704 lines
21 KiB
JavaScript
/**
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* @file
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* Drupal's states library.
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*/
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(function ($) {
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'use strict';
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/**
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* The base States namespace.
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*
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* Having the local states variable allows us to use the States namespace
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* without having to always declare "Drupal.states".
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*
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* @namespace Drupal.states
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*/
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var states = Drupal.states = {
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/**
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* An array of functions that should be postponed.
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*/
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postponed: []
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};
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/**
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* Attaches the states.
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*
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* @type {Drupal~behavior}
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*/
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Drupal.behaviors.states = {
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attach: function (context, settings) {
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var $states = $(context).find('[data-drupal-states]');
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var config;
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var state;
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var il = $states.length;
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for (var i = 0; i < il; i++) {
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config = JSON.parse($states[i].getAttribute('data-drupal-states'));
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for (state in config) {
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if (config.hasOwnProperty(state)) {
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new states.Dependent({
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element: $($states[i]),
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state: states.State.sanitize(state),
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constraints: config[state]
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});
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}
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}
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}
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// Execute all postponed functions now.
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while (states.postponed.length) {
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(states.postponed.shift())();
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}
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}
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};
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/**
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* Object representing an element that depends on other elements.
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*
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* @constructor Drupal.states.Dependent
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*
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* @param {object} args
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* Object with the following keys (all of which are required)
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* @param {jQuery} args.element
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* A jQuery object of the dependent element
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* @param {Drupal.states.State} args.state
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* A State object describing the state that is dependent
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* @param {object} args.constraints
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* An object with dependency specifications. Lists all elements that this
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* element depends on. It can be nested and can contain
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* arbitrary AND and OR clauses.
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*/
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states.Dependent = function (args) {
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$.extend(this, {values: {}, oldValue: null}, args);
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this.dependees = this.getDependees();
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for (var selector in this.dependees) {
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if (this.dependees.hasOwnProperty(selector)) {
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this.initializeDependee(selector, this.dependees[selector]);
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}
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}
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};
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/**
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* Comparison functions for comparing the value of an element with the
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* specification from the dependency settings. If the object type can't be
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* found in this list, the === operator is used by default.
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*
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* @name Drupal.states.Dependent.comparisons
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*
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* @prop {function} RegExp
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* @prop {function} Function
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* @prop {function} Number
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*/
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states.Dependent.comparisons = {
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RegExp: function (reference, value) {
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return reference.test(value);
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},
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Function: function (reference, value) {
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// The "reference" variable is a comparison function.
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return reference(value);
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},
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Number: function (reference, value) {
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// If "reference" is a number and "value" is a string, then cast
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// reference as a string before applying the strict comparison in
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// compare().
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// Otherwise numeric keys in the form's #states array fail to match
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// string values returned from jQuery's val().
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return (typeof value === 'string') ? compare(reference.toString(), value) : compare(reference, value);
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}
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};
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states.Dependent.prototype = {
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/**
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* Initializes one of the elements this dependent depends on.
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*
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* @memberof Drupal.states.Dependent#
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*
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* @param {string} selector
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* The CSS selector describing the dependee.
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* @param {object} dependeeStates
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* The list of states that have to be monitored for tracking the
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* dependee's compliance status.
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*/
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initializeDependee: function (selector, dependeeStates) {
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var state;
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var self = this;
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function stateEventHandler(e) {
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self.update(e.data.selector, e.data.state, e.value);
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}
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// Cache for the states of this dependee.
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this.values[selector] = {};
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for (var i in dependeeStates) {
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if (dependeeStates.hasOwnProperty(i)) {
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state = dependeeStates[i];
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// Make sure we're not initializing this selector/state combination
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// twice.
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if ($.inArray(state, dependeeStates) === -1) {
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continue;
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}
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state = states.State.sanitize(state);
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// Initialize the value of this state.
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this.values[selector][state.name] = null;
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// Monitor state changes of the specified state for this dependee.
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$(selector).on('state:' + state, {selector: selector, state: state}, stateEventHandler);
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// Make sure the event we just bound ourselves to is actually fired.
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new states.Trigger({selector: selector, state: state});
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}
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}
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},
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/**
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* Compares a value with a reference value.
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*
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* @memberof Drupal.states.Dependent#
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*
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* @param {object} reference
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* The value used for reference.
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* @param {string} selector
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* CSS selector describing the dependee.
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* @param {Drupal.states.State} state
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* A State object describing the dependee's updated state.
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*
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* @return {bool}
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* true or false.
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*/
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compare: function (reference, selector, state) {
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var value = this.values[selector][state.name];
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if (reference.constructor.name in states.Dependent.comparisons) {
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// Use a custom compare function for certain reference value types.
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return states.Dependent.comparisons[reference.constructor.name](reference, value);
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}
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else {
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// Do a plain comparison otherwise.
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return compare(reference, value);
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}
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},
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/**
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* Update the value of a dependee's state.
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*
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* @memberof Drupal.states.Dependent#
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*
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* @param {string} selector
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* CSS selector describing the dependee.
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* @param {Drupal.states.state} state
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* A State object describing the dependee's updated state.
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* @param {string} value
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* The new value for the dependee's updated state.
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*/
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update: function (selector, state, value) {
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// Only act when the 'new' value is actually new.
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if (value !== this.values[selector][state.name]) {
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this.values[selector][state.name] = value;
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this.reevaluate();
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}
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},
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/**
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* Triggers change events in case a state changed.
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*
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* @memberof Drupal.states.Dependent#
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*/
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reevaluate: function () {
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// Check whether any constraint for this dependent state is satisfied.
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var value = this.verifyConstraints(this.constraints);
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// Only invoke a state change event when the value actually changed.
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if (value !== this.oldValue) {
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// Store the new value so that we can compare later whether the value
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// actually changed.
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this.oldValue = value;
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// Normalize the value to match the normalized state name.
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value = invert(value, this.state.invert);
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// By adding "trigger: true", we ensure that state changes don't go into
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// infinite loops.
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this.element.trigger({type: 'state:' + this.state, value: value, trigger: true});
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}
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},
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/**
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* Evaluates child constraints to determine if a constraint is satisfied.
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*
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* @memberof Drupal.states.Dependent#
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*
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* @param {object|Array} constraints
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* A constraint object or an array of constraints.
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* @param {string} selector
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* The selector for these constraints. If undefined, there isn't yet a
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* selector that these constraints apply to. In that case, the keys of the
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* object are interpreted as the selector if encountered.
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*
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* @return {bool}
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* true or false, depending on whether these constraints are satisfied.
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*/
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verifyConstraints: function (constraints, selector) {
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var result;
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if ($.isArray(constraints)) {
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// This constraint is an array (OR or XOR).
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var hasXor = $.inArray('xor', constraints) === -1;
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var len = constraints.length;
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for (var i = 0; i < len; i++) {
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if (constraints[i] !== 'xor') {
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var constraint = this.checkConstraints(constraints[i], selector, i);
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// Return if this is OR and we have a satisfied constraint or if
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// this is XOR and we have a second satisfied constraint.
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if (constraint && (hasXor || result)) {
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return hasXor;
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}
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result = result || constraint;
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}
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}
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}
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// Make sure we don't try to iterate over things other than objects. This
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// shouldn't normally occur, but in case the condition definition is
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// bogus, we don't want to end up with an infinite loop.
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else if ($.isPlainObject(constraints)) {
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// This constraint is an object (AND).
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for (var n in constraints) {
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if (constraints.hasOwnProperty(n)) {
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result = ternary(result, this.checkConstraints(constraints[n], selector, n));
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// False and anything else will evaluate to false, so return when
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// any false condition is found.
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if (result === false) { return false; }
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}
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}
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}
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return result;
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},
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/**
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* Checks whether the value matches the requirements for this constraint.
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*
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* @memberof Drupal.states.Dependent#
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*
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* @param {string|Array|object} value
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* Either the value of a state or an array/object of constraints. In the
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* latter case, resolving the constraint continues.
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* @param {string} [selector]
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* The selector for this constraint. If undefined, there isn't yet a
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* selector that this constraint applies to. In that case, the state key
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* is propagates to a selector and resolving continues.
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* @param {Drupal.states.State} [state]
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* The state to check for this constraint. If undefined, resolving
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* continues. If both selector and state aren't undefined and valid
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* non-numeric strings, a lookup for the actual value of that selector's
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* state is performed. This parameter is not a State object but a pristine
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* state string.
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*
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* @return {bool}
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* true or false, depending on whether this constraint is satisfied.
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*/
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checkConstraints: function (value, selector, state) {
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// Normalize the last parameter. If it's non-numeric, we treat it either
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// as a selector (in case there isn't one yet) or as a trigger/state.
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if (typeof state !== 'string' || (/[0-9]/).test(state[0])) {
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state = null;
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}
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else if (typeof selector === 'undefined') {
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// Propagate the state to the selector when there isn't one yet.
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selector = state;
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state = null;
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}
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if (state !== null) {
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// Constraints is the actual constraints of an element to check for.
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state = states.State.sanitize(state);
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return invert(this.compare(value, selector, state), state.invert);
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}
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else {
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// Resolve this constraint as an AND/OR operator.
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return this.verifyConstraints(value, selector);
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}
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},
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/**
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* Gathers information about all required triggers.
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*
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* @memberof Drupal.states.Dependent#
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*
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* @return {object}
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*/
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getDependees: function () {
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var cache = {};
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// Swivel the lookup function so that we can record all available
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// selector- state combinations for initialization.
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var _compare = this.compare;
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this.compare = function (reference, selector, state) {
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(cache[selector] || (cache[selector] = [])).push(state.name);
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// Return nothing (=== undefined) so that the constraint loops are not
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// broken.
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};
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// This call doesn't actually verify anything but uses the resolving
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// mechanism to go through the constraints array, trying to look up each
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// value. Since we swivelled the compare function, this comparison returns
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// undefined and lookup continues until the very end. Instead of lookup up
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// the value, we record that combination of selector and state so that we
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// can initialize all triggers.
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this.verifyConstraints(this.constraints);
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// Restore the original function.
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this.compare = _compare;
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return cache;
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}
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};
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/**
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* @constructor Drupal.states.Trigger
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*
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* @param {object} args
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*/
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states.Trigger = function (args) {
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$.extend(this, args);
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if (this.state in states.Trigger.states) {
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this.element = $(this.selector);
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// Only call the trigger initializer when it wasn't yet attached to this
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// element. Otherwise we'd end up with duplicate events.
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if (!this.element.data('trigger:' + this.state)) {
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this.initialize();
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}
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}
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};
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states.Trigger.prototype = {
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/**
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* @memberof Drupal.states.Trigger#
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*/
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initialize: function () {
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var trigger = states.Trigger.states[this.state];
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if (typeof trigger === 'function') {
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// We have a custom trigger initialization function.
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trigger.call(window, this.element);
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}
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else {
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for (var event in trigger) {
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if (trigger.hasOwnProperty(event)) {
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this.defaultTrigger(event, trigger[event]);
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}
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}
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}
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// Mark this trigger as initialized for this element.
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this.element.data('trigger:' + this.state, true);
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},
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/**
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* @memberof Drupal.states.Trigger#
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*
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* @param {jQuery.Event} event
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* @param {function} valueFn
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*/
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defaultTrigger: function (event, valueFn) {
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var oldValue = valueFn.call(this.element);
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// Attach the event callback.
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this.element.on(event, $.proxy(function (e) {
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var value = valueFn.call(this.element, e);
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// Only trigger the event if the value has actually changed.
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if (oldValue !== value) {
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this.element.trigger({type: 'state:' + this.state, value: value, oldValue: oldValue});
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oldValue = value;
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}
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}, this));
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states.postponed.push($.proxy(function () {
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// Trigger the event once for initialization purposes.
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this.element.trigger({type: 'state:' + this.state, value: oldValue, oldValue: null});
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}, this));
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}
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};
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/**
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* This list of states contains functions that are used to monitor the state
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* of an element. Whenever an element depends on the state of another element,
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* one of these trigger functions is added to the dependee so that the
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* dependent element can be updated.
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*
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* @name Drupal.states.Trigger.states
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*
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* @prop empty
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* @prop checked
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* @prop value
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* @prop collapsed
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*/
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states.Trigger.states = {
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// 'empty' describes the state to be monitored.
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empty: {
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// 'keyup' is the (native DOM) event that we watch for.
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keyup: function () {
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// The function associated with that trigger returns the new value for
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// the state.
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return this.val() === '';
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}
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},
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checked: {
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change: function () {
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// prop() and attr() only takes the first element into account. To
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// support selectors matching multiple checkboxes, iterate over all and
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// return whether any is checked.
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var checked = false;
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this.each(function () {
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// Use prop() here as we want a boolean of the checkbox state.
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// @see http://api.jquery.com/prop/
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checked = $(this).prop('checked');
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// Break the each() loop if this is checked.
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return !checked;
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});
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return checked;
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}
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},
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// For radio buttons, only return the value if the radio button is selected.
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value: {
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keyup: function () {
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// Radio buttons share the same :input[name="key"] selector.
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if (this.length > 1) {
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// Initial checked value of radios is undefined, so we return false.
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return this.filter(':checked').val() || false;
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}
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return this.val();
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},
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change: function () {
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// Radio buttons share the same :input[name="key"] selector.
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if (this.length > 1) {
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// Initial checked value of radios is undefined, so we return false.
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return this.filter(':checked').val() || false;
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}
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return this.val();
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}
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},
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collapsed: {
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collapsed: function (e) {
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return (typeof e !== 'undefined' && 'value' in e) ? e.value : !this.is('[open]');
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}
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}
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};
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/**
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* A state object is used for describing the state and performing aliasing.
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*
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* @constructor Drupal.states.State
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*
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* @param {string} state
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*/
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states.State = function (state) {
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/**
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* Original unresolved name.
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*/
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this.pristine = this.name = state;
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// Normalize the state name.
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var process = true;
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do {
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// Iteratively remove exclamation marks and invert the value.
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while (this.name.charAt(0) === '!') {
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this.name = this.name.substring(1);
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this.invert = !this.invert;
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}
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// Replace the state with its normalized name.
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if (this.name in states.State.aliases) {
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this.name = states.State.aliases[this.name];
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}
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else {
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process = false;
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}
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} while (process);
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};
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/**
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* Creates a new State object by sanitizing the passed value.
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*
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* @name Drupal.states.State.sanitize
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*
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* @param {string|Drupal.states.State} state
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*
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* @return {Drupal.states.state}
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*/
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states.State.sanitize = function (state) {
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if (state instanceof states.State) {
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return state;
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}
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else {
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return new states.State(state);
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}
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};
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/**
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* This list of aliases is used to normalize states and associates negated
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* names with their respective inverse state.
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*
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* @name Drupal.states.State.aliases
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*/
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states.State.aliases = {
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enabled: '!disabled',
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invisible: '!visible',
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invalid: '!valid',
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untouched: '!touched',
|
|
optional: '!required',
|
|
filled: '!empty',
|
|
unchecked: '!checked',
|
|
irrelevant: '!relevant',
|
|
expanded: '!collapsed',
|
|
open: '!collapsed',
|
|
closed: 'collapsed',
|
|
readwrite: '!readonly'
|
|
};
|
|
|
|
states.State.prototype = {
|
|
|
|
/**
|
|
* @memberof Drupal.states.State#
|
|
*/
|
|
invert: false,
|
|
|
|
/**
|
|
* Ensures that just using the state object returns the name.
|
|
*
|
|
* @memberof Drupal.states.State#
|
|
*
|
|
* @return {string}
|
|
*/
|
|
toString: function () {
|
|
return this.name;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Global state change handlers. These are bound to "document" to cover all
|
|
* elements whose state changes. Events sent to elements within the page
|
|
* bubble up to these handlers. We use this system so that themes and modules
|
|
* can override these state change handlers for particular parts of a page.
|
|
*/
|
|
|
|
$(document).on('state:disabled', function (e) {
|
|
// Only act when this change was triggered by a dependency and not by the
|
|
// element monitoring itself.
|
|
if (e.trigger) {
|
|
$(e.target)
|
|
.prop('disabled', e.value)
|
|
.closest('.js-form-item, .js-form-submit, .js-form-wrapper').toggleClass('form-disabled', e.value)
|
|
.find('select, input, textarea').prop('disabled', e.value);
|
|
|
|
// Note: WebKit nightlies don't reflect that change correctly.
|
|
// See https://bugs.webkit.org/show_bug.cgi?id=23789
|
|
}
|
|
});
|
|
|
|
$(document).on('state:required', function (e) {
|
|
if (e.trigger) {
|
|
if (e.value) {
|
|
var label = 'label' + (e.target.id ? '[for=' + e.target.id + ']' : '');
|
|
var $label = $(e.target).attr({'required': 'required', 'aria-required': 'aria-required'}).closest('.js-form-item, .js-form-wrapper').find(label);
|
|
// Avoids duplicate required markers on initialization.
|
|
if (!$label.hasClass('js-form-required').length) {
|
|
$label.addClass('js-form-required form-required');
|
|
}
|
|
}
|
|
else {
|
|
$(e.target).removeAttr('required aria-required').closest('.js-form-item, .js-form-wrapper').find('label.js-form-required').removeClass('js-form-required form-required');
|
|
}
|
|
}
|
|
});
|
|
|
|
$(document).on('state:visible', function (e) {
|
|
if (e.trigger) {
|
|
$(e.target).closest('.js-form-item, .js-form-submit, .js-form-wrapper').toggle(e.value);
|
|
}
|
|
});
|
|
|
|
$(document).on('state:checked', function (e) {
|
|
if (e.trigger) {
|
|
$(e.target).prop('checked', e.value);
|
|
}
|
|
});
|
|
|
|
$(document).on('state:collapsed', function (e) {
|
|
if (e.trigger) {
|
|
if ($(e.target).is('[open]') === e.value) {
|
|
$(e.target).find('> summary a').trigger('click');
|
|
}
|
|
}
|
|
});
|
|
|
|
/**
|
|
* These are helper functions implementing addition "operators" and don't
|
|
* implement any logic that is particular to states.
|
|
*/
|
|
|
|
/**
|
|
* Bitwise AND with a third undefined state.
|
|
*
|
|
* @function Drupal.states~ternary
|
|
*
|
|
* @param {*} a
|
|
* @param {*} b
|
|
*
|
|
* @return {bool}
|
|
*/
|
|
function ternary(a, b) {
|
|
if (typeof a === 'undefined') {
|
|
return b;
|
|
}
|
|
else if (typeof b === 'undefined') {
|
|
return a;
|
|
}
|
|
else {
|
|
return a && b;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Inverts a (if it's not undefined) when invertState is true.
|
|
*
|
|
* @function Drupal.states~invert
|
|
*
|
|
* @param {*} a
|
|
* @param {bool} invertState
|
|
*
|
|
* @return {bool}
|
|
*/
|
|
function invert(a, invertState) {
|
|
return (invertState && typeof a !== 'undefined') ? !a : a;
|
|
}
|
|
|
|
/**
|
|
* Compares two values while ignoring undefined values.
|
|
*
|
|
* @function Drupal.states~compare
|
|
*
|
|
* @param {*} a
|
|
* @param {*} b
|
|
*
|
|
* @return {bool}
|
|
*/
|
|
function compare(a, b) {
|
|
if (a === b) {
|
|
return typeof a === 'undefined' ? a : true;
|
|
}
|
|
else {
|
|
return typeof a === 'undefined' || typeof b === 'undefined';
|
|
}
|
|
}
|
|
|
|
})(jQuery);
|