Can I assume asp.net form's ID always being the same?

Question

I want to submit a simple asp.net form in jQuery

can I assume

$("form[0]").submit()

always works, cross browser?

Answer 1

You mean something like this

$("#aspnetForm").submit()

Something like above would work cross browser as you said

The code you pasted is cross browser too. It won't work on ANY browser so maybe that counts as cross browser :-) just a joke

Answer 2

These will:

$("#aspnetForm").submit()

or

var theForm = document.forms['aspnetForm'];
theForm.submit()

Answer 3

No, you can't assume this. $("form[0]").submit() will submit the first form on the page. However, you can have more than one form on an ASP.NET page, though only one of these forms can be a server-side form (with runat="server" attribute).

If what you want is to submit the server-side form on an ASP.NET page then I think the best way would be to do it in code-behind by registering a script. It's a bit more hassle, but should always work (and when there is no server-side form it will detect it). Something like this:

protected override void OnPreRender(EventArgs e)
{
    base.OnPreRender(e);

    if (this.Form != null)
    {
        string js = String.Format("$('#{0}').submit()", this.Form.ClientID);
        Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "Submit", js, true);
    }
}