40 lines
1.5 KiB
Plaintext
40 lines
1.5 KiB
Plaintext
(function($){
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$.fn.extend({
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elastic: function() {
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var mimics = new Array('paddingTop','paddingRight','paddingBottom','paddingLeft','fontSize','lineHeight','fontFamily','width','fontWeight');
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return this.each(function() {
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if(this.type == 'textarea') {
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var textarea = $(this);
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var marginbottom = parseInt(textarea.css('lineHeight'))*2 || parseInt(textarea.css('fontSize'))*2;
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var minheight = parseInt(textarea.css('height')) || marginbottom;
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var goalheight = 0;
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var twin = null;
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function update() {
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if (!twin)
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{
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twin = $('<div />').css({'display': 'none','position': 'absolute'}).appendTo('body');
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$.each(mimics, function(){
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twin.css(this,textarea.css(this));
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});
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}
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var content = textarea.val().replace(/<|>/g, ' ').replace(/\n/g, '<br />').replace(/&/g,"&").replace(/ /g,' ')
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if (twin.text() != content)
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{
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twin.html(content);
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goalheight = (twin.height()+marginbottom > minheight)?twin.height()+marginbottom:minheight;
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if(Math.abs(goalheight - textarea.height()) > 10)
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textarea.animate({'height': goalheight},500);
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}
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}
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textarea.css({overflow: 'hidden',display: 'block'}).bind('focus',function() { self.periodicalUpdater = window.setInterval(function() {update();}, 400); }).bind('blur', function() { clearInterval(self.periodicalUpdater); });
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update();
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}
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});
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}
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});
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})(jQuery); |