asp.net中js+jquery添加下拉框值和后台获取示例

时间:2022-09-07 20:42:10

代码如下:


<html xmlns="http://www.w3.org/1999/xhtml"> 
<head runat="server"> 
<title></title> 
<script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script> 
<script type="text/javascript"> 
$(function () { 
$(".cg2").change(function () { 
var id = $(this).attr("id"); 
var value = $(this).val(); 
var newid = '#'+id.replace('_1_', '_2_');//把第一列id替换成第二列id 
//alert(newid); 
var data = "t1*v1|t2*v2|t3*v3";//后台获取的数据格式,这里用固定值了 
var datas = data.split('|');//分割成多组 
for (var i = 0; i < datas.length; i++) { 
var d1 = datas[i].split('*');//每组分割成 显示值和真实值 
$(newid).append("<option value=\""+d1[1]+"\">" + d1[0] + "</option>"); 
//alert(d1); 

// alert(id + "|||" + value); 
}); 
}) 

</script> 
</head> 
<body> 
<form id="form1" runat="server"> 
<div>为了满足两列,任意多行。后台动态生成下拉框,还要前后列联级的需求。使用js+jquery,用服务器控件+Ajax也不行,老是选择之后就 
<asp:DropDownList ID="ddl_1_1" CssClass="cg2" runat="server"> 
<asp:ListItem Text="txt1" Value="val1"></asp:ListItem> 
<asp:ListItem Text="txt1" Value="val1"></asp:ListItem> 
<asp:ListItem Text="txt1" Value="val1"></asp:ListItem> 
</asp:DropDownList> 
<asp:DropDownList ID="ddl_2_1" runat="server"> 
</asp:DropDownList><br/> 
<asp:DropDownList ID="ddl_1_2" CssClass="cg2" runat="server"> 
<asp:ListItem Text="txt2" Value="val2"></asp:ListItem> 
<asp:ListItem Text="txt2" Value="val2"></asp:ListItem> 
<asp:ListItem Text="txt2" Value="val2"></asp:ListItem> 
</asp:DropDownList> 
<asp:DropDownList ID="ddl_2_2" runat="server"> 
</asp:DropDownList><br/> 
<asp:Button ID="ButtonGet" runat="server" Text="获取" onclick="ButtonGet_Click" /> 
<asp:Label ID="Label1" runat="server" Text=""></asp:Label> 
</div> 
</form> 
</body> 
</html> 

//后台 

protected void Page_Load(object sender, EventArgs e) 

if (!IsPostBack) 





protected void ButtonGet_Click(object sender, EventArgs e) 

///获取通过js加选择的 ddl_2_1 控件选中的值,显示在Label1上。 
Label1.Text = Request["ddl_2_1"].ToString();