Passing javascript variable to VB.Net
Question
I have the code needed to pass a variable from javascript to vb.net, but it is not working for some reason and I can't seem to figure out what is wrong with the code. Please help. I declared a hidden variable and it stores the value and is then posted back, but the variable in the codebehind file is always empty.
Aspx code ( EDITED: )
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="WebApplication3.WebForm1" %>
<%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:HiddenField ID="nwLatHidden" runat="server" Value="" />
<telerik:RadScriptManager ID="RadScriptManager1" runat="server">
<Scripts>
<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.Core.js">
</asp:ScriptReference>
<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQuery.js">
</asp:ScriptReference>
<asp:ScriptReference Assembly="Telerik.Web.UI" Name="Telerik.Web.UI.Common.jQueryInclude.js">
</asp:ScriptReference>
</Scripts>
</telerik:RadScriptManager>
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
</telerik:RadAjaxManager>
<telerik:RadHtmlChart runat="server" ID="RadHtmlChart1">
<Legend>
<Appearance Position="Bottom">
<TextStyle FontSize="14" Color="Blue" FontFamily="Courier New, sans-serif" />
</Appearance>
</Legend>
<PlotArea>
<XAxis>
<Items>
<telerik:AxisItem LabelText="KM41872"/>
<telerik:AxisItem LabelText="KM41873"/>
<telerik:AxisItem LabelText="KM41871"/>
</Items>
<MajorGridLines Visible="false" />
<MinorGridLines Visible="false" />
</XAxis>
<YAxis>
<MinorGridLines Visible="false" />
</YAxis>
<Series>
<telerik:LineSeries Name="Mean">
<SeriesItems>
<telerik:CategorySeriesItem Y="0.59" />
<telerik:CategorySeriesItem Y="0.63" />
<telerik:CategorySeriesItem Y="0.6" />
<telerik:CategorySeriesItem Y="0.65" />
<telerik:CategorySeriesItem Y="0.64" />
<telerik:CategorySeriesItem Y="0.63" />
<telerik:CategorySeriesItem Y="0.65" />
<telerik:CategorySeriesItem Y="0.67" />
<telerik:CategorySeriesItem Y="0.63" />
</SeriesItems>
</telerik:LineSeries>
<telerik:LineSeries Name="Min">
<SeriesItems>
<telerik:CategorySeriesItem Y="0.55" />
<telerik:CategorySeriesItem Y="0.56" />
<telerik:CategorySeriesItem Y="0.55" />
<telerik:CategorySeriesItem Y="0.61" />
<telerik:CategorySeriesItem Y="0.56" />
<telerik:CategorySeriesItem Y="0.57" />
<telerik:CategorySeriesItem Y="0.59" />
<telerik:CategorySeriesItem Y="0.61" />
<telerik:CategorySeriesItem Y="0.55" />
</SeriesItems>
</telerik:LineSeries>
<telerik:LineSeries Name="Max">
<SeriesItems>
<telerik:CategorySeriesItem Y="0.66" />
<telerik:CategorySeriesItem Y="0.74" />
<telerik:CategorySeriesItem Y="0.66" />
<telerik:CategorySeriesItem Y="0.71" />
<telerik:CategorySeriesItem Y="0.72" />
<telerik:CategorySeriesItem Y="0.73" />
<telerik:CategorySeriesItem Y="0.71" />
<telerik:CategorySeriesItem Y="0.74" />
<telerik:CategorySeriesItem Y="0.71" />
</SeriesItems>
</telerik:LineSeries>
</Series>
</PlotArea>
</telerik:RadHtmlChart>
</form>
<script type="text/javascript">
document.getElementById('nwLatHidden').value = '6.00';
</script>
</body>
</html>
Codebehind: Public Class WebForm1 Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim nwLat As String
nwLat = nwLatHidden.Value.ToString
End Sub
End Class
1 answers
solution1
0 2014-07-09 19:04:21
try this
document.getElementById('<%=nwLatHidden.clientID').value = '6.00';
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