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shadow does not get built until the the textarea has been rendered. This #4

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shadow does not get built until the the textarea has been rendered. This #4

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47 changes: 28 additions & 19 deletions javascripts/jquery.autogrow-textarea.js
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@

(function($) {

/*
Expand All @@ -6,24 +7,35 @@
$.fn.autogrow = function(options) {

this.filter('textarea').each(function() {

var $this = $(this),
minHeight = $this.height(),
lineHeight = $this.css('lineHeight');

var shadow = $('<div></div>').css({
position: 'absolute',
top: -10000,
left: -10000,
width: $(this).width() - parseInt($this.css('paddingLeft')) - parseInt($this.css('paddingRight')),
fontSize: $this.css('fontSize'),
fontFamily: $this.css('fontFamily'),
lineHeight: $this.css('lineHeight'),
resize: 'none'
}).appendTo(document.body);
minHeight = -1,
lineHeight = '';

var shadow = undefined;

var update = function() {

//only set the shadow if it has not been set already and this is
//the first time that update has been called with $this having a
//height of > 0
if(shadow === undefined && $this.height() !== 0){
minHeight = $this.height(),
lineHeight = $this.css('lineHeight');
shadow = $('<div></div>').css({
position: 'absolute',
top: -10000,
left: -10000,
width: $(this).width() - parseInt($this.css('paddingLeft')) - parseInt($this.css('paddingRight')),
fontSize: $this.css('fontSize'),
fontFamily: $this.css('fontFamily'),
lineHeight: $this.css('lineHeight'),
resize: 'none'
}).appendTo(document.body);
}
//If we do not have a shadow yet, it is because $this does not have
//a height or width. Do nothing.
if(shadow === undefined){
return;
}
var times = function(string, number) {
for (var i = 0, r = ''; i < number; i ++) r += string;
return r;
Expand All @@ -40,15 +52,12 @@
$(this).css('height', Math.max(shadow.height() + 20, minHeight));

}

$(this).change(update).keyup(update).keydown(update);

update.apply(this);

});

return this;

}

})(jQuery);
})(jQuery);