jQuery 如何在asp.net代码隐藏中获取HiddenField值
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How to get HiddenField value in asp.net code-behind
提问by user441222
How to get HiddenField value in asp.net code-behind？ Thanks in advance!
如何在 asp.net 代码隐藏中获取 HiddenField 值？提前致谢！
public partial class ReadCard : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache);
}
protected void Button1_Click(object sender, EventArgs e)
{
this.ClientScript.RegisterStartupScript(this.GetType(), "MyClick ", "<script>ReadCard();</script> ");
string b= HiddenField1.Value; //How to get the value "123"??
}
}
aspx:
ASP：
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<meta http-equiv="expires" content="0"/>
<meta http-equiv="cache-control" content="no-cache"/>
<meta http-equiv="pragma" content="no-cache"/>
<script src="jquery-1.5.2.min.js" type="text/javascript"></script>
<script type="text/javascript">
function ReadCard() {
$("#HiddenField1").val("123");
}
</script>
</head>
<body>
<form id="form1" runat="server">
<asp:HiddenField ID="HiddenField1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
</form>
</body>
</html>
回答by McGarnagle
The client ID isn't necessarily the same as the server ID (unless you're using CliendIDMode=Static. You can insert a server tag to get the client ID.
客户端 ID 不一定与服务器 ID 相同（除非您使用的是CliendIDMode=Static。您可以插入服务器标记来获取客户端 ID。
Note also that you have to put the script inside a document.readytag, or put the script at the bottom of the page -- otherwise the script won't find HiddenField1, as it will not have been loaded into the DOM yet.
另请注意，您必须将脚本放在document.ready标签内，或将脚本放在页面底部——否则脚本将找不到 HiddenField1，因为它尚未加载到 DOM 中。
$(document).ready(function() {
$("<%= HiddenField1.ClientID %>").val("123");
});
回答by Aristos
Your issue is on how you set it.
你的问题在于你如何设置它。
$("#<%=HiddenField1.ClientID%>").val("123");
You need to use the rendered control id.
您需要使用呈现的控件 ID。
Follow up. This code
跟进。这段代码
protected void Button1_Click(object sender, EventArgs e)
{
this.ClientScript.RegisterStartupScript(this.GetType(), "MyClick ", "<script>ReadCard();</script> ");
string b= HiddenField1.Value; //How to get the value "123"??
}
is actually the same as :
实际上是一样的：
protected void Button1_Click(object sender, EventArgs e)
{
HiddenField1.Value = "123";
}
Because you actually you try to set the value with registering a javascript code, but why ? you can direct set that value from code behind.
因为您实际上尝试通过注册 javascript 代码来设置该值，但为什么呢？您可以直接从后面的代码中设置该值。
Where do you really wont to get that value ?
你真的不会在哪里得到那个价值？
回答by Shree
Try :
尝试 ：
$("#<%= HiddenField1.ClientID %>").val("123");
And in .cs file:
在 .cs 文件中：
string b= HiddenField1.Value;
