80 linhas
2.9 KiB
JavaScript
80 linhas
2.9 KiB
JavaScript
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/**
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* jQuery Once Plugin v1.2
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* http://plugins.jquery.com/project/once
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*
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* Dual licensed under the MIT and GPL licenses:
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* http://www.opensource.org/licenses/mit-license.php
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* http://www.gnu.org/licenses/gpl.html
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*/
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(function ($) {
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var cache = {}, uuid = 0;
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/**
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* Filters elements by whether they have not yet been processed.
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*
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* @param id
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* (Optional) If this is a string, then it will be used as the CSS class
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* name that is applied to the elements for determining whether it has
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* already been processed. The elements will get a class in the form of
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* "id-processed".
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*
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* If the id parameter is a function, it will be passed off to the fn
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* parameter and the id will become a unique identifier, represented as a
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* number.
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*
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* When the id is neither a string or a function, it becomes a unique
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* identifier, depicted as a number. The element's class will then be
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* represented in the form of "jquery-once-#-processed".
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*
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* Take note that the id must be valid for usage as an element's class name.
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* @param fn
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* (Optional) If given, this function will be called for each element that
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* has not yet been processed. The function's return value follows the same
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* logic as $.each(). Returning true will continue to the next matched
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* element in the set, while returning false will entirely break the
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* iteration.
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*/
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$.fn.once = function (id, fn) {
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if (typeof id != 'string') {
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// Generate a numeric ID if the id passed can't be used as a CSS class.
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if (!(id in cache)) {
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cache[id] = ++uuid;
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}
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// When the fn parameter is not passed, we interpret it from the id.
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if (!fn) {
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fn = id;
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}
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id = 'jquery-once-' + cache[id];
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}
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// Remove elements from the set that have already been processed.
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var name = id + '-processed';
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var elements = this.not('.' + name).addClass(name);
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return $.isFunction(fn) ? elements.each(fn) : elements;
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};
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/**
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* Filters elements that have been processed once already.
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*
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* @param id
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* A required string representing the name of the class which should be used
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* when filtering the elements. This only filters elements that have already
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* been processed by the once function. The id should be the same id that
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* was originally passed to the once() function.
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* @param fn
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* (Optional) If given, this function will be called for each element that
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* has not yet been processed. The function's return value follows the same
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* logic as $.each(). Returning true will continue to the next matched
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* element in the set, while returning false will entirely break the
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* iteration.
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*/
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$.fn.removeOnce = function (id, fn) {
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var name = id + '-processed';
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var elements = this.filter('.' + name).removeClass(name);
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return $.isFunction(fn) ? elements.each(fn) : elements;
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};
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})(jQuery);
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