可控制伸缩高度的textarea

2013-10-14 04:50:41 -0700

<style type="text/css">
/* Reset style */
* { margin:0; padding:0; word-break:break-all; }
body { background:#FFF; color:#333; font:12px/1.4em Helvetica, Arial, sans-serif; }
h1, h2, h3, h4, h5, h6 { font-size:1em; }
a { color:#333; text-decoration:none; }
	a:hover { text-decoration:underline; }
ul, li { list-style:none; }
fieldset, img { border:none; }
input, textarea, select, button { font:12px Helvetica, Arial, sans-serif; }
.button { padding:0 10px; height: 22px; border: 1px solid; border-color: #EEE #999 #999 #EEE; background: #DDD; color: #333; line-height: 20px; cursor: pointer; margin-left:2px; }
.submit { padding:0 10px; height: 22px; border: 1px solid; border-color: #DDD #CC8305 #CC8305 #DDD; background: #FFA200; color: #FFF; line-height: 20px; letter-spacing: 1px; cursor: pointer; }

/* edit style */
#edit { width:300px; margin:50px; }
	.edit_caption { width:100%; overflow:hidden; margin-bottom:1px; overflow:hidden; }
	.edit_caption span { display:block; float:left; margin:0 1px; padding:4px 10px; background:#DDD; cursor:pointer; }
	.edit_caption span:hover { background:#EEE; }
	#edit textarea { width:300px; height:80px; margin:0; padding:0; }
</style>

<script type="text/javascript">
var addH=1;
function addHeight() {
  if (!document.getElementById('comment_content')) return flase;
	var comment = document.getElementById('comment_content');
	var nowH = parseInt(comment.style.height);
	if (nowH < 250) {	
		nowH+=2;
		comment.style.height=nowH+"px";
		addH++;
		if (addH > 25){ 
			addH=1;
		} else {
		window.setTimeout("addHeight()","10");
		}
	}
}

function minHeight() {
  if (!document.getElementById('comment_content')) return flase;
	var comment = document.getElementById('comment_content');
	var nowH = parseInt(comment.style.height);
	if (nowH > 50) {
		nowH-=2;
		comment.style.height=nowH+"px";
		addH++;
		if (addH > 25){ 
			addH=1;
		} else {
		window.setTimeout("minHeight()","10");
		}
	}
}

</script>

</head>
<body>
<div id="edit">
	<div class="edit_caption">
		<span class="tool_bigger" onclick="addHeight()">放大</span>
		<span class="tool_smaller" onclick="minHeight()">缩小</span>
	</div>
	<div><textarea id="comment_content" tabindex="1" rows="8" name="comment_content" style="height:100px">输入框文字</删除我textarea>

代码演示

放大缩小

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