call javascript function on page load by code behind in c#

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i have a dropdown like tihs

ASP.NET

<asp:DropDownList ID="ddlodem" runat="server">

And trying to call javascript like this.
On page load i am writting this line

C#

ddlodem.Attributes.Add("onchange", "return OdemaVisible('<%=ddlOdem.ClientID%>','divOdema','divOedema')")

but it is not working

Posted 27-Sep-13 23:41pm

satpal 2

Updated 28-Sep-13 1:32am

Dholakiya Ankit

v3

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Comments

Dholakiya Ankit 28-Sep-13 7:33am

Can you post your javascript function?

satpal 2 5-Oct-13 3:45am

here is code for javascript function

function OdemaVisible(x, y, z) {
alert("Sat1");
var ddlscanchoice = document.getElementById('<%=ddlOdem.ClientID%>').options[document.getElementById('<%=ddlOdem.ClientID%>').selectedIndex].text;

if (ddlscanchoice == "Yes") {
document.getElementById(y).style.visibility = "visible";
document.getElementById(z).style.visibility = "visible";
}
else {

document.getElementById(y).style.visibility = "hidden";
document.getElementById(z).style.visibility = "hidden";

}
}

Dholakiya Ankit 5-Oct-13 6:20am

Don't use client id do like this inspect element in your browser and get client id copied and put it in to code then see the result and instead onchange use onclick event....and then tell me ......
-ank

Harshil_Raval 28-Sep-13 7:45am

What is not working? Are you not able to call that function on change event? or function is not working as your need?

satpal 2 5-Oct-13 3:45am

here is code for javascript function

function OdemaVisible(x, y, z) {
alert("Sat1");
var ddlscanchoice = document.getElementById('<%=ddlOdem.ClientID%>').options[document.getElementById('<%=ddlOdem.ClientID%>').selectedIndex].text;

if (ddlscanchoice == "Yes") {
document.getElementById(y).style.visibility = "visible";
document.getElementById(z).style.visibility = "visible";
}
else {

document.getElementById(y).style.visibility = "hidden";
document.getElementById(z).style.visibility = "hidden";

}
}

3 solutions

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**Azee** · Answer 1 · 2013-09-27T23:58:00

Solution 1

Here this'll work:

C#

ddlOdem.Attributes["onchange"] ="OdemaVisible('"+ddlOdem.ClientID+"','divOdema','divOedema')";

Cheers

Goodluck

Posted 27-Sep-13 23:58pm

Azee

Comments

satpal 2 28-Sep-13 6:18am

Asif ..it is still not working

Azee 28-Sep-13 11:20am

I replicated your scenario and the JavaScript function does get called. There could be something wrong in your function. Debug your JavaScript function. Try alerts from line to line. If its not your function that post your complete code. I'll take a look.

satpal 2 5-Oct-13 3:38am

here is code for javascript function

function OdemaVisible(x, y, z) {
alert("Sat1");
var ddlscanchoice = document.getElementById('<%=ddlOdem.ClientID%>').options[document.getElementById('<%=ddlOdem.ClientID%>').selectedIndex].text;

if (ddlscanchoice == "Yes") {
document.getElementById(y).style.visibility = "visible";
document.getElementById(z).style.visibility = "visible";
}
else {

document.getElementById(y).style.visibility = "hidden";
document.getElementById(z).style.visibility = "hidden";

}
}

Rakesh Meel · Answer 2 · 2013-09-28T01:23:00

Solution 2

visit here...

http://social.msdn.microsoft.com/Forums/vstudio/en-US/a5f09794-3224-4c9d-8453-688a303a9198/call-javascript-function-from-c-codebehind[^]

Posted 28-Sep-13 1:23am

Rakesh Meel

Singh Gyan · Answer 3 · 2013-09-29T00:40:00

Solution 3

You need to use RegsiterClientScipt. This will help you to call javascript function either before page load or after page load.

Posted 29-Sep-13 0:40am

Singh Gyan