54 lines
1.4 KiB
JavaScript
54 lines
1.4 KiB
JavaScript
/*!
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* jQuery Textarea AutoSize plugin
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* Author: Javier Julio
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* Licensed under the MIT license
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*/
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;(function ($, window, document, undefined) {
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var pluginName = "textareaAutoSize";
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var pluginDataName = "plugin_" + pluginName;
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var containsText = function (value) {
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return (value.replace(/\s/g, '').length > 0);
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};
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function Plugin(element, options) {
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this.element = element;
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this.$element = $(element);
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this.init();
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}
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Plugin.prototype = {
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init: function() {
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var height = this.$element.outerHeight();
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var diff = parseInt(this.$element.css('paddingBottom')) +
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parseInt(this.$element.css('paddingTop')) || 0;
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if (containsText(this.element.value)) {
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this.$element.height(this.element.scrollHeight - diff);
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}
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// keyup is required for IE to properly reset height when deleting text
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this.$element.on('input keyup', function(event) {
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var $window = $(window);
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var currentScrollPosition = $window.scrollTop();
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$(this)
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.height(0)
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.height(this.scrollHeight - diff);
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$window.scrollTop(currentScrollPosition);
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});
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}
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};
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$.fn[pluginName] = function (options) {
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this.each(function() {
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if (!$.data(this, pluginDataName)) {
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$.data(this, pluginDataName, new Plugin(this, options));
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}
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});
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return this;
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};
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})(jQuery, window, document);
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