CODEWITHSUNDEEP
c#.netasp.netjavascript
Vaibhav Jain
Vaibhav Jain

Reputation: 34407

Run JavaScript code at ASP.NET page load

I have a radiobox <asp:RadioButtonList CssClass="list" Style="width: 150px" ID="rdo_RSD_ExcerciseRoT" runat="server" Font-Bold="false" RepeatDirection="Horizontal" RepeatLayout="Table" TextAlign="Left" > <asp:ListItem Text="Yes" onclick="en();" Value="Y"></asp:ListItem> <asp:ListItem Text="No" onclick="dis();" Value="N" Selected="True"></asp:ListItem> </asp:RadioButtonList>

AS you may see second listitem is selected by default. But issue is, when my page is getting load dis() is not getting called. I want to run dis() on page load too.

I tried google, some blogs suggest the use of Page.RegisterStartupScript Method. But I dont exactly know what is the problem and why we should use this above mentioned method. I would appreciate if someone please tell me why this function is not getting called and how to call it.

Edit: I am giving Javascript code also, if it helps.

    <script type="text/javascript">
    function dis()
    {
        ValidatorEnable(document.getElementById('<%=RequiredFieldValidator32.ClientID%>'), false);
    }

    function en()
    {
        ValidatorEnable(document.getElementById('<%=RequiredFieldValidator32.ClientID%>'), true);
    }


</script>

Upvotes: 2

Views: 8910

Answers (5)

Sebastian P.R. Gingter
Sebastian P.R. Gingter

Reputation: 6085

Default list items are SET by default. They don't get CLICKED on page load to select them. So this is the reason the function defined for OnClick is not called.

You coud either include a script - Tag in that you call dis() or you could use RegisterStartupScript.

The script tag would look like:

<script type="text/javascript">
  dis();
</script>

And would have to be included in the page's html source.

RegisterScriptControl does this internally. It also has the option to gather several startup script calls and renders them in a single script-tag.

Upvotes: 1

Joel Coehoorn
Joel Coehoorn

Reputation: 415600

You need to run the script when the page loads because no one has clicked your list item yet. You should use Page.RegisterStartupScript vs <body onload="..."> to do this for three reasons:

  1. Asp.net may want to use the normal <body onload="..."> script for something else.
  2. You can control whether or not you want the script to also run on postbacks
  3. RegisterStartupScript can protect you from naming conflicts (say, a custom control you use wants to run a script with the same name at startup as well) and from accidentally setting the script to run more than once.

Upvotes: 0

Sphvn
Sphvn

Reputation: 5343

<body onload="dis()">

</body>

done.

Upvotes: 0

Sefler
Sefler

Reputation: 2237

If you want to execute C# code on Server side on page load, overide

 protected void Page_Load(object sender, EventArgs e)

If you want to execute JavaScript on page load, use "onLoad" in "<body>" tag. like

<body onload="dis();">

Hope it helps.

Upvotes: 0

Amarghosh
Amarghosh

Reputation: 59451

dis() is assigned to the onclick - meaning it'll be called only when the list item is clicked on by the user. You can call dis() from the onload of the <body> if you want.

Upvotes: 1

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