I'm trying to set the value of an ASP TextBox via javascript when I click a button but I can't get the ClientID of my TextBox control using code blocks.
I get this error :
The Controls collection cannot be modified because the control contains code blocks (ie <% ... %>)
Here's my .aspx:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="App.aspx.cs" Inherits="StatsWeb.App" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<link href="Styles/Site.css" rel="Stylesheet" type="text/css" />
<script>
function testf() {
alert("here");
document.getElementById('<%= TextBox1.ClientID %>').value = "asd";
return false;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Menu ID="Menu1" runat="server" DataSourceID="XmlDataSource1"
CssClass="Menu" StaticDisplayLevels="2" MaximumDynamicDisplayLevels="5" >
<DataBindings>
<asp:MenuItemBinding DataMember="rule" TextField="name" ValueField="value"/>
<asp:MenuItemBinding DataMember="splitByField" TextField="name" ValueField="value" NavigateUrl="javascript:testf()"/>
<asp:MenuItemBinding DataMember="splitByObject" TextField="name" ValueField="value"/>
<asp:MenuItemBinding DataMember="statDefinition" TextField="name" ValueField="value"/>
</DataBindings>
</asp:Menu>
<asp:XmlDataSource ID="XmlDataSource1" runat="server"
DataFile="~/App_Data/stats.xml"></asp:XmlDataSource>
<asp:Literal ID="Message" runat="server" Text="Status:"></asp:Literal>
<asp:TextBox ID="TextBox1" runat="server" EnableTheming="True" Height="137px"
Rows="6" TextMode="MultiLine" Width="842px"></asp:TextBox>
</div>
</form>
</body>
</html>
Replace
<asp:MenuItemBinding DataMember="splitByField" TextField="name" ValueField="value" NavigateUrl="javascript:testf()"/>
with
<asp:MenuItemBinding DataMember="splitByField" TextField="name" ValueField="value" OnClientClick="return testf()"/>
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