How to call javascript function in asp.net pageload event only on pageload

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How to call javascript function in asp.net pageload event only on pageload

i tried it, i got the output but it is executed on all the time that means when i click the button it gets executed so that if any body tell how can i execute that function only once on pageload

i used this code

<body  onload="Return myfunction();"

Posted 9-Dec-12 23:03pm

Member 9644686

Updated 10-Dec-12 20:56pm

Savalia Manoj M

v2

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Krunal Rohit · Answer 1 · 2012-12-09T23:04:00

Solution 1

C#

window.onload = function()
                {
                   Function();
                };

Posted 9-Dec-12 23:04pm

Krunal Rohit

Comments

Member 9644686 10-Dec-12 5:06am

where can i place it,

[no name] 10-Dec-12 5:08am

in javascript...

J.Karthick · Answer 2 · 2012-12-10T20:35:00

Hi,

I assume you are using AJAX control in your page,
you can call your JAVASCRIPT function by using SCRIPTMANAGER control in your page_load event like

if(!ispostback)
{
 ScriptManager.RegisterStartupScript(this, this.GetType(), "KeyClient", "<script>return myFunction();;</Script>", false);
}

Dee_Bee · Answer 3 · 2012-12-09T23:29:00

Solution 2

C#

if (!IsPostBack)
  
{
          
ddlTaskLevel.Attributes.Add("onchange", "javascript:return function()"); 
} // for example i took a drop down box.

place this in page load in code behind.

Posted 9-Dec-12 23:29pm

Dee_Bee

Updated 10-Dec-12 22:33pm

v3

sisir patro · Answer 4 · 2012-12-11T00:59:00

HI,

you can try like this also.

XML

<head runat="server">
    <title>Calling javascript function from code behind example</title>
        <script type="text/javascript">
            function showDialogue() {
                alert("this dialogue has been invoked through codebehind.");
            }
        </script>
</head>
..........

lblJavaScript.Text = "<script type='text/javascript'>showDialogue();</script>";

Or you can also try like the below code in page load.

Page.ClientScript.RegisterClientScriptBlock(typeof(ScriptManager), "CallMyMethod", "myMethod();");

Thanks

Sathesh Kumar A · Answer 5 · 2014-05-08T02:11:00

Solution 7

inside head tag

window.onload = function()
{
Function();
};

Posted 8-May-14 2:11am

Sathesh Kumar A

Comments

CHill60 8-May-14 8:15am

No different to Solution 1 posted a year and a half ago

Dileep Goplakrishnan 7-Jan-15 3:44am

Thanks bro...

Manglani, Umesh · Answer 6 · 2012-12-10T20:29:00

You want to add the event only first time or when Page Load first. You can either check IsPostBack property within Page_Load event and Add the JS functional if it is False. Whenever the page is posted back, the IsPostBack becomes True, so it won't be added again.

C#

protected void Page_Load(object sender, EventArgs e)
{
        if (!IsPostBack)
        {
           btnYourButton.Attributes.Add("onclick","JSFunctionaName();");
        }
}