65 lines
2.1 KiB
Plaintext
65 lines
2.1 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 lineheight = parseInt(textarea.css('lineHeight'),10) || parseInt(textarea.css('fontSize'),'10');
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var minheight = parseInt(textarea.css('height'),10) || lineheight*3;
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var maxheight = parseInt(textarea.css('max-height'),10) || 0;
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var goalheight = 0;
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var twin = null;
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var first = true;
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if(maxheight < 0) maxheight = 0;
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if (!twin)
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{
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twin = $('<div />').css({'position': 'absolute','display':'none'}).appendTo(textarea.parent());
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$.each(mimics, function(){
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twin.css(this.toString(),textarea.css(this.toString()));
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});
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};
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function update() {
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var content = textarea.val().replace(/<|>/g, ' ').replace(/\n/g, '<br />').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()+lineheight*2 > minheight)?twin.height()+lineheight*2:minheight;
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if(goalheight <= maxheight || maxheight == 0){
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textarea.css({overflow: 'hidden'});
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if(Math.abs(goalheight - textarea.height()) > lineheight){
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textarea.css({'height': goalheight+(lineheight*2) + 'px'});
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}
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} else {
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textarea.css({overflow: 'auto'});
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if(maxheight != textarea.height()){
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textarea.css({'height': maxheight + 'px'});
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if(first){
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temp = textarea.val();
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textarea.val('');
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setTimeout(function() {
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textarea.val(temp);
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}, 1);
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first = false;
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}
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}
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}
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}
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}
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textarea.css({overflow: 'auto'}).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); |