Calling an ASP generated button click from a javascript

Question

I've following button on my web control,

<asp:Button runat="server" ID="btnSave" Text="Save" onclick="btnSave_Click"  OnClientClick="myShowWaitScreenWithNoClose('Processing...', 'Saving survey.Please wait it may take minutes..');" CssClass="buttons" Height="46px" Width="212px" Visible="false"  />

and I'm trying to click this button using JavaScript from code behind. Like,

protected void Page_Load(object sender, EventArgs e)
{

 if (!IsPostBack)
   {
        ScriptManager.RegisterStartupScript(this, this.GetType(), "scr", "setTimeout(function(){document.getElementById('btnSave').click(); return false;}, 180000);", true);
   }
}

But it throws an error Error: TypeError: document.getElementById(...) is null

Brad M · Accepted Answer · 2013-03-19 15:31:15Z

3

It throws this error because the ID you declare is not the same as what is rendered.

<asp:Button runat="server" ID="btnSave" clientIdMode="static">

Add the clientIdMode="static" attribute so your ID will render exactly as your declared it.

answered Mar 19, 2013 at 15:31

Brad M

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Comments

Icarus · Accepted Answer · 2013-03-19 15:32:19Z

1

Is returning null most likely because the id of the btnSave control is changed when it's rendered on the client side unless you use CliendIDMode="static"

For your code to work, you need to change it to:

  if (!IsPostBack)
   {
        ScriptManager.RegisterStartupScript(this, this.GetType(), "scr", "setTimeout(function(){document.getElementById('"+btnSave.ClientID+"').click(); return false;}, 180000);", true);
   }

answered Mar 19, 2013 at 15:32

Icarus

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Comments

Muhammad Hani · Accepted Answer · 2013-03-19 15:31:20Z

0

To get a server-side control via Javascript, use the below

document.getElementById('<%=btnSave.ClientID%>').click();

answered Mar 19, 2013 at 15:31

Muhammad Hani

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1 Comment

Ris Over a year ago

Tried following but same error, ScriptManager.RegisterStartupScript(this, this.GetType(), "scr", "setTimeout(function(){document.getElementById('<%=btnSave.ClientID%>').click(); return false;}, 180000);", true);

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