How to get HiddenField value in asp.net code-behind
How to get HiddenField value in asp.net code-behind？ Thanks in advance!
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:
<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>
Answer
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.
Note also that you have to put the script inside a document.ready tag, 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.
$(document).ready(function() {
$("<%= HiddenField1.ClientID %>").val("123");
});