Calling JavaScript Function

Question

1.80/5 (2 votes)

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I want to Call Java Script Function in vb.net code behind in button event I tried all Codes like

VB

System.Web.UI.ScriptManager.RegisterClientScriptBlock(Page, GetType(Page), "Script", " SendMsguserout();", True)

but it doesn't work this is the code in java script

JavaScript

var count = 1;
       function SendMsg()
       {
           if(document.getElementById('txtMessage').value != '')
           {
               CallServer(document.getElementById('txtMessage').value, "");
               var strMsg = document.getElementById('lblChatMessages').innerHTML;
               document.getElementById('lblChatMessages').innerHTML = strMsg + '<a name="+ count + "></a><font color="red">Me :</font> ' + document.getElementById('txtMessage').value + '<br>';
               location.href = '#' + count;
               count =parseInt(count) + 1;
               //return false;
           }
       }

I want to Call it here

VB

Protected Sub ImageButton1_Click(sender As Object, e As System.Web.UI.ImageClickEventArgs) Handles ImageButton1.Click

        Dim doc As New XmlDocument()
        doc.Load(Me.Server.MapPath("XML/" & ViewState("CID") & ".xml"))
        Dim node As XmlNode = doc.SelectSingleNode("DocumentElement/chatMessages/UserStatus[. = ' 1']")
        If node IsNot Nothing Then

          Call it here 
        Else

         Call it here 





        End If

    End Sub

Posted 26-Mar-13 1:38am

mohammed besher

Updated 26-Mar-13 1:43am

Vani Kulkarni

v3

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Comments

bbirajdar 26-Mar-13 7:50am

Client side code CANNOT BE called from server side... Server side code executes in the IIS server and client side executes in browser

kishore sharma 26-Mar-13 8:14am

You can call from server side,have you added script manager on that page,you need to add script manager.

bbirajdar 26-Mar-13 8:49am

No No No....RegisterClientScriptBlock is used to REGISTER the script onto the page and NOT TO EXECUTE or CALL it.. Read more hee on msdn http://msdn.microsoft.com/en-us/library/system.web.ui.clientscriptmanager.registerclientscriptblock.aspx

You need a client side event to call this registered script.

bbirajdar 26-Mar-13 8:50am

Moreever the script is wrong since he is using server ID of the controls. He should use client ID

var strMsg = document.getElementById('lblChatMessages').innerHTML;

2 solutions

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Sheikh Muhammad Haris · Answer 1 · 2013-03-26T04:34:00

Solution 2

Add ScriptManager to your aspx page.

Posted 26-Mar-13 4:34am

Sheikh Muhammad Haris

govardhan4u · Answer 2 · 2013-03-26T01:48:00

Solution 1

Try like this.

ScriptManager.RegisterStartupScript(Me, GetType(Page), "Alert", "Javascript:Delete_SuccessMsg();", True)

Posted 26-Mar-13 1:48am

govardhan4u

Comments

mohammed besher 26-Mar-13 7:56am

Thanks I tried it But it doesn't work

govardhan4u 26-Mar-13 8:03am

Any error message. Try to keep the break point there.
Just try if javascript is executing by keeping a alert msg like
ScriptManager.RegisterStartupScript(Me, GetType(Page), "Alert", "Javascript:alert('test');", True)

mohammed besher 26-Mar-13 8:40am

ScriptManager.RegisterStartupScript(Me, GetType(Page), "Alert", "Javascript:alert('test');", True) works very well

govardhan4u 26-Mar-13 8:43am

Then check if you have specified script path or not in the page?
<script language="javascript" type="text/javascript" src="/Folder1/JavaScripts/Test.js"></script>

mohammed besher 26-Mar-13 8:52am

but this function in same page Did i have to put it in separate folder ?????

mohammed besher 26-Mar-13 8:55am

that is code in the page

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="execChatWindow.aspx.vb" Inherits="execChatWindow" %>

<!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 id="Head1" runat="server">
<title>Executive Chat Window</title>
<link href="style.css" rel="stylesheet" />
<script type="text/javascript">
var count = 1;
function SendMsg() {

if (document.getElementById('txtMessage').value != '') {
CallServer(document.getElementById('txtMessage').value, "");
var strMsg = document.getElementById('lblChatMessages').innerHTML;
document.getElementById('lblChatMessages').innerHTML = strMsg + 'Me : ' + document.getElementById('txtMessage').value + '<br>';
location.href = '#' + count;
count = parseInt(count) + 1;
//return false;
}
}

function ReceiveServerData(arg, context) {
//alert('Processed callback.');
document.getElementById('txtMessage').value = '';
}

</script>

<script type="text/javascript">
// Script to generate an automatic postBack to the server

govardhan4u 26-Mar-13 9:04am

Keep that javascript method in separate file and gives its path here.

mohammed besher 26-Mar-13 9:13am

I don't understand your way Can You Write Code ? please

kishore sharma 26-Mar-13 10:07am

Page.ClientScript.RegisterStartupScript(this.GetType(), "MyScript",
"javascript:TestJavascriptFunction();", true);
Use Like this if you use ScriptManager. class you need script manager in page