$(document).ready(function() {
var widthvalue;
if (jQuery.browser.msie) {
$("#DropDownList1").focus(function() {
widthvalue = $(this).css("width");
$(this).css("width", "auto");
}).blur(function() {
$(this).css("width", widthvalue);
});
}
});
http://kb.cnblogs.com/a/773764/
<head runat="server">
<title>无标题页</title>
<script src="jquery-1.5.2.js" type="text/javascript"></script>
<script language="javascript" type="text/javascript">
$(document).ready(function () {
//为了不至于和页面上其他元素混乱，所以把TreeView控件放在一个id为Treeview的div中，然后
//再查找checkbox
$("#Treeview table tr td input[type=checkbox]").live("click",
function () {
$("#Treeview div[id=" + $(this).attr("id").toString().replace(/CheckBox/, "Nodes") + "] table tr td input[type=checkbox]")
.attr("checked", $(this).attr("checked"));
}
);
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div id ="Treeview" runat="server">
<asp:TreeView ID="TreeView1" runat="server" ShowCheckBoxes="All">
<Nodes>
<asp:TreeNode Text="学院" Value="学院">
<asp:TreeNode Text="工商学院" Value="工商学院"></asp:TreeNode>
<asp:TreeNode Text="计算机学院" Value="计算机学院"></asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="市" Value="市">
<asp:TreeNode Text="济南市" Value="济南市">
<asp:TreeNode Text="历城区" Value="历城区"></asp:TreeNode>
<asp:TreeNode Text="章丘市" Value="章丘市"></asp:TreeNode>
</asp:TreeNode>
<asp:TreeNode Text="济宁市" Value="济宁市"></asp:TreeNode>
</asp:TreeNode>
</Nodes>
</asp:TreeView>
</div>
<asp:Button ID="Button1" runat="server" Text="Button" />
</form>
</body>
</html>