js控制textarea高度自适应

浏览数：50 / 时间：2015年06月09日

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
.chackTextarea-area{line-height: 20px; font-size: 14px;padding: 0;border: 1px solid #CDCDCD; width: 400px;}
</style>
<script type="text/javascript" src="jquery-1.7.1.js"></script>
<script type="text/javascript">
(function($){
    $.fn.autoTextarea = function(options) {
        var defaults={
            maxHeight:null,
            minHeight:$(this).height()
        };
        var opts = $.extend({},defaults,options);

        $(this).bind("paste cut keydown keyup focus blur",function(){
            var height,style=this.style;
            this.style.height =  opts.minHeight + ‘px‘;
            if (this.scrollHeight > opts.minHeight) {
                if (opts.maxHeight && this.scrollHeight > opts.maxHeight) {
                    height = opts.maxHeight;
                    style.overflowY = ‘scroll‘;
                } else {
                    height = this.scrollHeight;
                    style.overflowY = ‘hidden‘;
                }
                style.height = height  + ‘px‘;
            }
        });
    };
})(jQuery);
</script>
</head>
<body>
<div>
    <textarea name="textarea" id="textarea" cols="60" rows="1" class="chackTextarea-area"></textarea>
</div>   
<script type="text/javascript">
    $(".chackTextarea-area").autoTextarea({maxHeight:220});
</script>
</body>
</html>