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/*!
* @file jQuery Once
* @description Act on jQuery elements only once.
* @version 2.0.0-alpha.6
* @link http://github.com/robloach/jquery-once
* @author Rob Loach (http://robloach.net)
* @license MIT, GPL-2.0
*/
(function (factory) {
"use strict";
if (typeof exports === 'object') {
factory(require('jquery'));
} else if (typeof define === 'function' && define.amd) {
define(['jquery'], factory);
} else {
factory(jQuery);
}
}(function ($) {
"use strict";
var cache = {}, uuid = 0;
/**
* Filter elements by whether they have not yet been processed.
*
* @param {string} [id]
* (Optional) The data id used to determine whether the given elements have
* already been processed or not.
*
* When id is not provided, it becomes a unique identifier, depicted as a
* number. The element's data id will then be represented in the form of
* "jquery-once-#".
* @returns jQuery element collection of elements that have now run once by
* the given id.
*
* @example
* // Change the color to green only once.
* $('p').once('changecolor').css('color', 'green');
*
* @see removeOnce
* @see findOnce
*
* @public
* @global
*/
$.fn.once = function (id) {
if (typeof id !== 'string') {
// Generate a numeric ID if the id passed is not a string.
if (!(id in cache)) {
cache[id] = ++uuid;
}
id = cache[id];
}
// Filter the elements by which do not have the data yet.
var name = 'jquery-once-' + id;
return this.filter(function() {
return $(this).data(name) !== true;
}).data(name, true);
};
/**
* Removes the once data from the given elements, based on the given ID.
*
* @param {string} id
* A required string representing the name of the data id which should be used
* when filtering the elements. This only filters elements that have already
* been processed by the once function. The id should be the same id that
* was originally passed to the once() function.
*
* @returns jQuery element collection of elements that now have their once
* data removed.
*
* @example
* // Remove once data with the "changecolor" ID.
* $('p').removeOnce('changecolor').each(function() {
* // This function is called for all elements that had their once removed.
* });
*
* @see once
*
* @public
* @global
*/
$.fn.removeOnce = function (id) {
// Filter through the elements to find the once'd elements.
return this.findOnce(id).removeData('jquery-once-' + id);
};
/**
* Filters elements that have already been processed once.
*
* @param {string} id
* A required string representing the name of the data id which should be used
* when filtering the elements. This only filters elements that have already
* been processed by the once function. The id should be the same id that
* was originally passed to the once() function.
*
* @returns jQuery element collection of elements that have been run once.
*
* @example
* // Find all elements that have the changecolor'ed once.
* $('p').findOnce('changecolor').each(function() {
* // This function is called for all elements that has already once'd.
* });
*
* @see once
*
* @public
* @global
*/
$.fn.findOnce = function (id) {
// Filter the elements by which do have the data.
var name = 'jquery-once-' + id;
return this.filter(function() {
return $(this).data(name) === true;
});
};
}));
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