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I am facing a problem in using more than one instance of an aspx user control in a aspx page. This happens when I tried to fetch User control element value through Java script.
User Control Code:
<script type="text/javascript">
function ucFun()
{
var a = document.getElementById("<%=tbName.ClientID%>");
alert(a.value);
return false;
}
</script>
<asp:Label Text="Name" runat="server" ID="lblname"></asp:Label>
<asp:TextBox ID="tbName" runat="server" ></asp:TextBox>
<asp:Button ID="btSubmit" runat="server" Text="Go" OnClientClick="ucFun()" />
Web Form Code
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<uc:cont runat="server" ID="ucID" />
<uc:cont runat="server" ID="Cont1" />
<uc:cont runat="server" ID="Cont2" />
</div>
</form>
</body>
</html>
on clicking the Go button, it displays null int he alert box, as the element is undefined. However, When I have one instance of User control in the form, it rightly displayed the text box value.
Is there any way we should write this..
321
After some searching found a different solution.
http://www.aspsnippets.com/Articles/Issue-JavaScript-in-WebUserControl-not-working-when-used-multiple-times-on-same-page.aspx
Here they append an uniqueID with the javascript name, thereby there is no conflict with the javascripts.
UserControl.CS
protected string uniqueKey;
protected void Page_Load(object sender, EventArgs e)
{
this.uniqueKey = Guid.NewGuid().ToString("N");
this.Button1.Attributes["onclick"] = "return DisplayMessage_" + uniqueKey + "();";
}
UserControl.aspx
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="UC_TestCS.ascx.cs" Inherits="UC_TestCS" %>
<script type ="text/javascript">
function DisplayMessage_<%=uniqueKey %>() {
var message = document.getElementById("<%=TextBox1.ClientID %>").value;
alert(message);
return false;
}
</script>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Show Message" />
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