Call javascript function after return statement

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Hi All
Please help me with below issue.

I have submit form in which there are 3 options- 1. Text,2.Video,3.Image
if user select anyone option from above then respective div will open.

my javascript function is-

C#

function fn_radio()
{

//var form1="ContentPlaceHolder1";
var form1="ctl00_ContentPlaceHolder1";
//alert("hi");

if(document.getElementById(form1+'_rdo_text').checked)
{
//alert("text");
    document.getElementById("hidden_radio").value= "text";
    document.getElementById("div_text").style.display="block";
    document.getElementById("div_video").style.display="none";
    document.getElementById("div_image").style.display="none";
    document.getElementById("plus1").style.display="none";
}
if(document.getElementById(form1+'_rdo_video').checked)
{
//alert("video");
    document.getElementById("hidden_radio").value= "video";
    document.getElementById("div_video").style.display="block";
    document.getElementById("div_text").style.display="none";
    document.getElementById("div_image").style.display="none";
    document.getElementById("plus1").style.display="none";
}
if(document.getElementById(form1+'_rdo_image').checked)
{
//alert("image");
    document.getElementById("hidden_radio").value= "images";
    document.getElementById("div_text").style.display="none";
    document.getElementById("div_video").style.display="none";
    document.getElementById("div_image").style.display="block";
    document.getElementById("plus1").style.display="block";
}

 return true;   // return false to stop postback
}

Now the problem is- i am checking image size in code behind file. n if it returns false then i want to call above function.

what to do?
Pls help me out...

Posted 22-Apr-13 2:21am

Sweetynewb

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4 solutions

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TrushnaK · Answer 1 · 2013-04-22T02:29:00

Solution 1

Add this line to your code from where you want to call js function:-

ScriptManager.RegisterStartupScript(this, GetType(), "radioEle", "fn_radio();", true)

Posted 22-Apr-13 2:29am

TrushnaK

Updated 22-Apr-13 2:42am

v2

Comments

Ali Reza Barkhordari 22-Apr-13 8:34am

Note1 :It's better to use ClientScript , isn't ? Note 2: 'Me' is in VB not C#

TrushnaK 22-Apr-13 8:44am

I used that because:-

You've pretty much identified the primary difference. The ScriptManager is meant to be used with async postbacks, which is why it works with the UpdatePanel. The ClientScript class is for synchronous postbacks. So, if you're going to be posting back from an UpdatePanel, be sure to use the ScriptManager instead of ClientScript.

Sweetynewb 22-Apr-13 8:51am

yes but where should i write this? bcoz after return statement it exits codebehind funcion

TrushnaK 22-Apr-13 8:55am

Before exit of your function. remember it calls after code behind function.

Ali Reza Barkhordari · Answer 2 · 2013-04-22T02:32:00

Hi Sweetynewb , good time...

you can try this strategy:

*** In Server side ( Code-Behind file / .cs file )

C#

protected void BtnSubmit_clicked (object sender , eventargs e)
{
// check your image size here
if ( size is okay)
// do some thing
else
{
string str = "fn_radio();";
ClientScript.RegisterStartupScript(this.GetType , "myScript" , str , true);
}
}

Zafar Sultan · Answer 3 · 2013-04-22T02:32:00

In your code behind include the following code on condition:

C#

System.Text.StringBuilder JSText = new System.Text.StringBuilder();
JSText.Append(@"<script language='javascript'>");
JSText.Append(@"fn_radio();");
JSText.Append(@"</script>");
 
if (!ClientScript.IsStartupScriptRegistered("MyScript"))
{
ClientScript.RegisterStartupScript(this.GetType(), "MyScript", JSText .ToString());
}

If you are using AsyncPostback, you will have to use ScriptManager.RegisterStartupScript

Naz_Firdouse · Answer 4 · 2013-04-22T02:33:00

Solution 4

Instead of returning false from code behind,call this function like...

JavaScript

Page.ClientScript.RegisterStartupScript(this.Page.GetType(), "checkRadio", "fn_radio();");

Posted 22-Apr-13 2:33am

Naz_Firdouse

Updated 22-Apr-13 2:35am

v3

Call javascript function after return statement

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