jQuery学习笔记9——多行文本框流动条高度变化
这个例子中用的是滚动条的scrollTop属性
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>多行文本框滚动条高度变化</title>
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<script type="text/javascript" src="jquery-1.2.6.min.js"></script>
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<script type="text/javascript">
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$(document).ready(function(){
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var $comment = $("#comment");//获取评论框
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$(".bigger").click(function(){//判断是否处于动画
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if(!$comment.is(":animated")){
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$comment.animate({scrollTop:"+=50"},400);
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}
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});//“放大”按钮绑定单击事件
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$(".small").click(function(){//判断是否处于动画
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if(!$comment.is(":animated")){
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$comment.animate({scrollTop:"-=50"},400)
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}
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});//"缩小"按钮绑定单击事件
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})
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</script>
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<style type="text/css">
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.msg_caption span{ background:#ccc; display:inline-block; width:60px; text-align:center; height:28px; line-height:28px; cursor:pointer;}
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</style>
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</head>
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<body>
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<form>
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<div class="msg">
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<div class="msg_caption">
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<span class="bigger">向下</span>
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<span class="small">向上</span>
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</div>
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<div>
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<textarea id="comment" rows="8" cols="20">
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</textarea>
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</div>
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</div>
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</form>
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</body>
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</html>
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