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Rob Davies 2017-02-13 15:31:17 +00:00
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web/core/misc
drupal.js

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/**
* @file
* Defines the Drupal JavaScript API.
*/
/**
* A jQuery object, typically the return value from a `$(selector)` call.
*
* Holds an HTMLElement or a collection of HTMLElements.
*
* @typedef {object} jQuery
*
* @prop {number} length=0
* Number of elements contained in the jQuery object.
*/
/**
* Variable generated by Drupal that holds all translated strings from PHP.
*
* Content of this variable is automatically created by Drupal when using the
* Interface Translation module. It holds the translation of strings used on
* the page.
*
* This variable is used to pass data from the backend to the frontend. Data
* contained in `drupalSettings` is used during behavior initialization.
*
* @global
*
* @var {object} drupalTranslations
*/
/**
* Global Drupal object.
*
* All Drupal JavaScript APIs are contained in this namespace.
*
* @global
*
* @namespace
*/
window.Drupal = {behaviors: {}, locale: {}};
// Class indicating that JavaScript is enabled; used for styling purpose.
document.documentElement.className += ' js';
// Allow other JavaScript libraries to use $.
if (window.jQuery) {
jQuery.noConflict();
}
// JavaScript should be made compatible with libraries other than jQuery by
// wrapping it in an anonymous closure.
(function (domready, Drupal, drupalSettings, drupalTranslations) {
'use strict';
/**
* Helper to rethrow errors asynchronously.
*
* This way Errors bubbles up outside of the original callstack, making it
* easier to debug errors in the browser.
*
* @param {Error|string} error
* The error to be thrown.
*/
Drupal.throwError = function (error) {
setTimeout(function () { throw error; }, 0);
};
/**
* Custom error thrown after attach/detach if one or more behaviors failed.
* Initializes the JavaScript behaviors for page loads and Ajax requests.
*
* @callback Drupal~behaviorAttach
*
* @param {HTMLDocument|HTMLElement} context
* An element to detach behaviors from.
* @param {?object} settings
* An object containing settings for the current context. It is rarely used.
*
* @see Drupal.attachBehaviors
*/
/**
* Reverts and cleans up JavaScript behavior initialization.
*
* @callback Drupal~behaviorDetach
*
* @param {HTMLDocument|HTMLElement} context
* An element to attach behaviors to.
* @param {object} settings
* An object containing settings for the current context.
* @param {string} trigger
* One of `'unload'`, `'move'`, or `'serialize'`.
*
* @see Drupal.detachBehaviors
*/
/**
* @typedef {object} Drupal~behavior
*
* @prop {Drupal~behaviorAttach} attach
* Function run on page load and after an Ajax call.
* @prop {Drupal~behaviorDetach} detach
* Function run when content is serialized or removed from the page.
*/
/**
* Holds all initialization methods.
*
* @namespace Drupal.behaviors
*
* @type {Object.<string, Drupal~behavior>}
*/
/**
* Defines a behavior to be run during attach and detach phases.
*
* Attaches all registered behaviors to a page element.
*
* Behaviors are event-triggered actions that attach to page elements,
* enhancing default non-JavaScript UIs. Behaviors are registered in the
* {@link Drupal.behaviors} object using the method 'attach' and optionally
* also 'detach'.
*
* {@link Drupal.attachBehaviors} is added below to the `jQuery.ready` event
* and therefore runs on initial page load. Developers implementing Ajax in
* their solutions should also call this function after new page content has
* been loaded, feeding in an element to be processed, in order to attach all
* behaviors to the new content.
*
* Behaviors should use `var elements =
* $(context).find(selector).once('behavior-name');` to ensure the behavior is
* attached only once to a given element. (Doing so enables the reprocessing
* of given elements, which may be needed on occasion despite the ability to
* limit behavior attachment to a particular element.)
*
* @example
* Drupal.behaviors.behaviorName = {
* attach: function (context, settings) {
* // ...
* },
* detach: function (context, settings, trigger) {
* // ...
* }
* };
*
* @param {HTMLDocument|HTMLElement} [context=document]
* An element to attach behaviors to.
* @param {object} [settings=drupalSettings]
* An object containing settings for the current context. If none is given,
* the global {@link drupalSettings} object is used.
*
* @see Drupal~behaviorAttach
* @see Drupal.detachBehaviors
*
* @throws {Drupal~DrupalBehaviorError}
*/
Drupal.attachBehaviors = function (context, settings) {
context = context || document;
settings = settings || drupalSettings;
var behaviors = Drupal.behaviors;
// Execute all of them.
for (var i in behaviors) {
if (behaviors.hasOwnProperty(i) && typeof behaviors[i].attach === 'function') {
// Don't stop the execution of behaviors in case of an error.
try {
behaviors[i].attach(context, settings);
}
catch (e) {
Drupal.throwError(e);
}
}
}
};
// Attach all behaviors.
domready(function () { Drupal.attachBehaviors(document, drupalSettings); });
/**
* Detaches registered behaviors from a page element.
*
* Developers implementing Ajax in their solutions should call this function
* before page content is about to be removed, feeding in an element to be
* processed, in order to allow special behaviors to detach from the content.
*
* Such implementations should use `.findOnce()` and `.removeOnce()` to find
* elements with their corresponding `Drupal.behaviors.behaviorName.attach`
* implementation, i.e. `.removeOnce('behaviorName')`, to ensure the behavior
* is detached only from previously processed elements.
*
* @param {HTMLDocument|HTMLElement} [context=document]
* An element to detach behaviors from.
* @param {object} [settings=drupalSettings]
* An object containing settings for the current context. If none given,
* the global {@link drupalSettings} object is used.
* @param {string} [trigger='unload']
* A string containing what's causing the behaviors to be detached. The
* possible triggers are:
* - `'unload'`: The context element is being removed from the DOM.
* - `'move'`: The element is about to be moved within the DOM (for example,
* during a tabledrag row swap). After the move is completed,
* {@link Drupal.attachBehaviors} is called, so that the behavior can undo
* whatever it did in response to the move. Many behaviors won't need to
* do anything simply in response to the element being moved, but because
* IFRAME elements reload their "src" when being moved within the DOM,
* behaviors bound to IFRAME elements (like WYSIWYG editors) may need to
* take some action.
* - `'serialize'`: When an Ajax form is submitted, this is called with the
* form as the context. This provides every behavior within the form an
* opportunity to ensure that the field elements have correct content
* in them before the form is serialized. The canonical use-case is so
* that WYSIWYG editors can update the hidden textarea to which they are
* bound.
*
* @throws {Drupal~DrupalBehaviorError}
*
* @see Drupal~behaviorDetach
* @see Drupal.attachBehaviors
*/
Drupal.detachBehaviors = function (context, settings, trigger) {
context = context || document;
settings = settings || drupalSettings;
trigger = trigger || 'unload';
var behaviors = Drupal.behaviors;
// Execute all of them.
for (var i in behaviors) {
if (behaviors.hasOwnProperty(i) && typeof behaviors[i].detach === 'function') {
// Don't stop the execution of behaviors in case of an error.
try {
behaviors[i].detach(context, settings, trigger);
}
catch (e) {
Drupal.throwError(e);
}
}
}
};
/**
* Encodes special characters in a plain-text string for display as HTML.
*
* @param {string} str
* The string to be encoded.
*
* @return {string}
* The encoded string.
*
* @ingroup sanitization
*/
Drupal.checkPlain = function (str) {
str = str.toString()
.replace(/&/g, '&amp;')
.replace(/"/g, '&quot;')
.replace(/</g, '&lt;')
.replace(/>/g, '&gt;');
return str;
};
/**
* Replaces placeholders with sanitized values in a string.
*
* @param {string} str
* A string with placeholders.
* @param {object} args
* An object of replacements pairs to make. Incidences of any key in this
* array are replaced with the corresponding value. Based on the first
* character of the key, the value is escaped and/or themed:
* - `'!variable'`: inserted as is.
* - `'@variable'`: escape plain text to HTML ({@link Drupal.checkPlain}).
* - `'%variable'`: escape text and theme as a placeholder for user-
* submitted content ({@link Drupal.checkPlain} +
* `{@link Drupal.theme}('placeholder')`).
*
* @return {string}
* The formatted string.
*
* @see Drupal.t
*/
Drupal.formatString = function (str, args) {
// Keep args intact.
var processedArgs = {};
// Transform arguments before inserting them.
for (var key in args) {
if (args.hasOwnProperty(key)) {
switch (key.charAt(0)) {
// Escaped only.
case '@':
processedArgs[key] = Drupal.checkPlain(args[key]);
break;
// Pass-through.
case '!':
processedArgs[key] = args[key];
break;
// Escaped and placeholder.
default:
processedArgs[key] = Drupal.theme('placeholder', args[key]);
break;
}
}
}
return Drupal.stringReplace(str, processedArgs, null);
};
/**
* Replaces substring.
*
* The longest keys will be tried first. Once a substring has been replaced,
* its new value will not be searched again.
*
* @param {string} str
* A string with placeholders.
* @param {object} args
* Key-value pairs.
* @param {Array|null} keys
* Array of keys from `args`. Internal use only.
*
* @return {string}
* The replaced string.
*/
Drupal.stringReplace = function (str, args, keys) {
if (str.length === 0) {
return str;
}
// If the array of keys is not passed then collect the keys from the args.
if (!Array.isArray(keys)) {
keys = [];
for (var k in args) {
if (args.hasOwnProperty(k)) {
keys.push(k);
}
}
// Order the keys by the character length. The shortest one is the first.
keys.sort(function (a, b) { return a.length - b.length; });
}
if (keys.length === 0) {
return str;
}
// Take next longest one from the end.
var key = keys.pop();
var fragments = str.split(key);
if (keys.length) {
for (var i = 0; i < fragments.length; i++) {
// Process each fragment with a copy of remaining keys.
fragments[i] = Drupal.stringReplace(fragments[i], args, keys.slice(0));
}
}
return fragments.join(args[key]);
};
/**
* Translates strings to the page language, or a given language.
*
* See the documentation of the server-side t() function for further details.
*
* @param {string} str
* A string containing the English text to translate.
* @param {Object.<string, string>} [args]
* An object of replacements pairs to make after translation. Incidences
* of any key in this array are replaced with the corresponding value.
* See {@link Drupal.formatString}.
* @param {object} [options]
* Additional options for translation.
* @param {string} [options.context='']
* The context the source string belongs to.
*
* @return {string}
* The formatted string.
* The translated string.
*/
Drupal.t = function (str, args, options) {
options = options || {};
options.context = options.context || '';
// Fetch the localized version of the string.
if (typeof drupalTranslations !== 'undefined' && drupalTranslations.strings && drupalTranslations.strings[options.context] && drupalTranslations.strings[options.context][str]) {
str = drupalTranslations.strings[options.context][str];
}
if (args) {
str = Drupal.formatString(str, args);
}
return str;
};
/**
* Returns the URL to a Drupal page.
*
* @param {string} path
* Drupal path to transform to URL.
*
* @return {string}
* The full URL.
*/
Drupal.url = function (path) {
return drupalSettings.path.baseUrl + drupalSettings.path.pathPrefix + path;
};
/**
* Returns the passed in URL as an absolute URL.
*
* @param {string} url
* The URL string to be normalized to an absolute URL.
*
* @return {string}
* The normalized, absolute URL.
*
* @see https://github.com/angular/angular.js/blob/v1.4.4/src/ng/urlUtils.js
* @see https://grack.com/blog/2009/11/17/absolutizing-url-in-javascript
* @see https://github.com/jquery/jquery-ui/blob/1.11.4/ui/tabs.js#L53
*/
Drupal.url.toAbsolute = function (url) {
var urlParsingNode = document.createElement('a');
// Decode the URL first; this is required by IE <= 6. Decoding non-UTF-8
// strings may throw an exception.
try {
url = decodeURIComponent(url);
}
catch (e) {
// Empty.
}
urlParsingNode.setAttribute('href', url);
// IE <= 7 normalizes the URL when assigned to the anchor node similar to
// the other browsers.
return urlParsingNode.cloneNode(false).href;
};
/**
* Returns true if the URL is within Drupal's base path.
*
* @param {string} url
* The URL string to be tested.
*
* @return {bool}
* `true` if local.
*
* @see https://github.com/jquery/jquery-ui/blob/1.11.4/ui/tabs.js#L58
*/
Drupal.url.isLocal = function (url) {
// Always use browser-derived absolute URLs in the comparison, to avoid
// attempts to break out of the base path using directory traversal.
var absoluteUrl = Drupal.url.toAbsolute(url);
var protocol = location.protocol;
// Consider URLs that match this site's base URL but use HTTPS instead of HTTP
// as local as well.
if (protocol === 'http:' && absoluteUrl.indexOf('https:') === 0) {
protocol = 'https:';
}
var baseUrl = protocol + '//' + location.host + drupalSettings.path.baseUrl.slice(0, -1);
// Decoding non-UTF-8 strings may throw an exception.
try {
absoluteUrl = decodeURIComponent(absoluteUrl);
}
catch (e) {
// Empty.
}
try {
baseUrl = decodeURIComponent(baseUrl);
}
catch (e) {
// Empty.
}
// The given URL matches the site's base URL, or has a path under the site's
// base URL.
return absoluteUrl === baseUrl || absoluteUrl.indexOf(baseUrl + '/') === 0;
};
/**
* Formats a string containing a count of items.
*
* This function ensures that the string is pluralized correctly. Since
* {@link Drupal.t} is called by this function, make sure not to pass
* already-localized strings to it.
*
* See the documentation of the server-side
* \Drupal\Core\StringTranslation\TranslationInterface::formatPlural()
* function for more details.
*
* @param {number} count
* The item count to display.
* @param {string} singular
* The string for the singular case. Please make sure it is clear this is
* singular, to ease translation (e.g. use "1 new comment" instead of "1
* new"). Do not use @count in the singular string.
* @param {string} plural
* The string for the plural case. Please make sure it is clear this is
* plural, to ease translation. Use @count in place of the item count, as in
* "@count new comments".
* @param {object} [args]
* An object of replacements pairs to make after translation. Incidences
* of any key in this array are replaced with the corresponding value.
* See {@link Drupal.formatString}.
* Note that you do not need to include @count in this array.
* This replacement is done automatically for the plural case.
* @param {object} [options]
* The options to pass to the {@link Drupal.t} function.
*
* @return {string}
* A translated string.
*/
Drupal.formatPlural = function (count, singular, plural, args, options) {
args = args || {};
args['@count'] = count;
var pluralDelimiter = drupalSettings.pluralDelimiter;
var translations = Drupal.t(singular + pluralDelimiter + plural, args, options).split(pluralDelimiter);
var index = 0;
// Determine the index of the plural form.
if (typeof drupalTranslations !== 'undefined' && drupalTranslations.pluralFormula) {
index = count in drupalTranslations.pluralFormula ? drupalTranslations.pluralFormula[count] : drupalTranslations.pluralFormula['default'];
}
else if (args['@count'] !== 1) {
index = 1;
}
return translations[index];
};
/**
* Encodes a Drupal path for use in a URL.
*
* For aesthetic reasons slashes are not escaped.
*
* @param {string} item
* Unencoded path.
*
* @return {string}
* The encoded path.
*/
Drupal.encodePath = function (item) {
return window.encodeURIComponent(item).replace(/%2F/g, '/');
};
/**
* Generates the themed representation of a Drupal object.
*
* All requests for themed output must go through this function. It examines
* the request and routes it to the appropriate theme function. If the current
* theme does not provide an override function, the generic theme function is
* called.
*
* @example
* <caption>To retrieve the HTML for text that should be emphasized and
* displayed as a placeholder inside a sentence.</caption>
* Drupal.theme('placeholder', text);
*
* @namespace
*
* @param {function} func
* The name of the theme function to call.
* @param {...args}
* Additional arguments to pass along to the theme function.
*
* @return {string|object|HTMLElement|jQuery}
* Any data the theme function returns. This could be a plain HTML string,
* but also a complex object.
*/
Drupal.theme = function (func) {
var args = Array.prototype.slice.apply(arguments, [1]);
if (func in Drupal.theme) {
return Drupal.theme[func].apply(this, args);
}
};
/**
* Formats text for emphasized display in a placeholder inside a sentence.
*
* @param {string} str
* The text to format (plain-text).
*
* @return {string}
* The formatted text (html).
*/
Drupal.theme.placeholder = function (str) {
return '<em class="placeholder">' + Drupal.checkPlain(str) + '</em>';
};
})(domready, Drupal, window.drupalSettings, window.drupalTranslations);