How can I pass a javascript value to asp.net variable?
How can I pass a javascript value to asp.net variable?
Run Sample | Download SourceYou can take following steps to read value from javascript. 1. Create html hidden field on page. 2. Set its value on client side using javascript. 3. Read html hidden field using Request.Forms["hiddenfieldname"] Following sample code shows how to achieve that functionality <%@ Page Language="C#" %>
<script runat="server">
string servervariable;
void ServerBtn_Click(object sender, EventArgs e)
{
servervariable = Request.Form["Hidden1"];
MessageField.Text = servervariable;
}
</script>
<head runat="server">
<title></title>
</head>
<body>
<p>
Following sample demonstrates a way to pass value from
javascript function to asp.net.
</p>
<p>
Since javascript function does not have access to
server side code we have to store value in
hidden field and then read hidden field value
from server side code.
</p>
<form id="form1" runat="server">
<div>
<input id="Hidden1" name="Hidden1" type="Hidden"
runat="server" value="old value" />
<input type="button"
onclick="alert(document.getElementById('Hidden1').value)"
value="Read Value From Client">
<input type="button"
onclick="document.getElementById('Hidden1').value = 'New Value'"
value="Set Value From Client">
<asp:Button runat="server" ID="ServerBtn"
OnClick="ServerBtn_Click" Text="Read Value From Server Side" />
</div>
<p>
<asp:Literal runat="server" ID="MessageField" />
</p>
</form>
</body>
</html>
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