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How is the default submit button on an HTML form determined?

Answer 1

+2 A:

HTML 4 does not make it explicit. The current HTML5 draft pretty much lets the browser do whatever it wants.

David Dorward 2009-05-29 10:31:09

Answer 2

+5 A:

If you submit the form via Javascript (i.e. formElement.submit() or anything equivalent), then none of the submit buttons are considered successful and none of their values are included in the submitted data. (Note that if you submit the form by using submitElement.click() then the submit that you had a reference to is considered active; this doesn't really fall under the remit of your question since here the submit button is unambiguous but I thought I'd include it for people who read the first part and wonder how to make a submit button successful via JS form submission. Of course, the form's onsubmit handlers will still fire this way whereas they wouldn't via form.submit() so that's another kettle of fish...)

If the form is submitted by hitting Enter while in a non-textarea field, then it's actually down to the user agent to decide what it wants here. The specs don't say anything about submitting a form using the enter key while in a text entry field (if you tab to a button and activate it using space or whatever, then there's no problem as that specific submit button is unambiguously used). All it says is that a form must be submitted when a submit button is activated, it's not even a requirement that hitting enter in e.g. a text input will submit the form.

I believe that Internet Explorer chooses the submit button that appears first in the source; I have a feeling that Firefox and Opera choose the button with the lowest tabindex, falling back to the first defined if nothing else is defined. There's also some complications regarding whether the submits have a non-default value attribute IIRC.

The point to take away is that there is no defined standard for what happens here and it's entirely at the whim of the browser - so as far as possible in whatever you're doing, try to avoid relying on any particular behaviour. If you really must know, you can probably find out the behaviour of the various browser versions but when I investigated this a while back there were some quite convoluted conditions (which of course are subject to change with new browser versions) and I'd advise you to avoid it if possible!

Andrzej Doyle 2009-05-29 10:41:13

Re para 2: My basic question was whether there's anything in any spec to the effect of "If the browser provides any means of submitting a form without specifying a submit control...". But I gather from David's reply that there isn't.My point about IE was that sometimes pressing Enter submits a form and doesn't set any submit button. A consequence is that, if you have multiple forms submitting to the same script, you can't rely on submit buttons to distinguish them. This came up in the project I'm working on.

Stewart 2009-05-29 11:06:23

Answer 3

A:

From your comments:

A consequence is that, if you have multiple forms submitting to the same script, you can't rely on submit buttons to distinguish them.

I drop an <input type="hidden" value="form_name" /> into each form.

If submitting with javascript: add submit events to forms, not click events to their buttons. Saavy users don't touch their mouse very often.

rpflo 2009-05-29 14:15:09

Indeed, but that begs this question:http://stackoverflow.com/questions/541869/determine-which-element-submitted-a-form-from-within-onsubmit

Stewart 2009-06-02 13:15:46

Answer 4

+1 A:

I had a form with 11 submit buttons on it, and it would always use the first submit button when the user pressed enter. I read elsewhere that it is not a good idea (bad practice) to have more than one submit button on a form, and the best way to do this is have the button you want as default, as the only submit button on the form. The other buttons should be made into "TYPE=BUTTON" and an onClick event added that calls your own submit routine in Javascript. Something like this :-

<SCRIPT Language="JavaScript">
function validform()
{
  // do whatever you need to validate the form, and return true or false accordingly
}

function mjsubmit()
{
  if (validform()) { document.form1.submit(); return true;}
  return false;
}
</SCRIPT>
<INPUT TYPE=BUTTON NAME="button1" VALUE="button1" onClick="document.form1.submitvalue='button1'; return mjsubmit();">
<INPUT TYPE=BUTTON NAME="button2" VALUE="button2" onClick="document.form1.submitvalue='button2'; return mjsubmit();">
<INPUT TYPE=SUBMIT NAME="button3" VALUE="button3" onClick="document.form1.submitvalue='button3'; return validform();">
<INPUT TYPE=BUTTON NAME="button4" VALUE="button4" onClick="document.form1.submitvalue='button4'; return mjsubmit();">

Here, button3 is the default, and although you are programmatically submitting the form with the other buttons, the mjsubmit routine validates them. HTH.

graphic 2010-03-17 13:06:21

Bad idea. Your form won't work with JS disabled. JS ought to be used unobtrusively.

BalusC 2010-03-17 13:07:44

Very few browsers have JS turned off by default, even the ones on iPods! On the form I was citing, JS off would render it useless! So much hinges on JS running.

graphic 2010-03-17 13:21:00

Turned off by default or not, those who have JS disabled ought not to have to switch it on just to get around such a silly little snag as this.

Stewart 2010-03-20 15:46:11

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How is the default submit button on an HTML form determined?

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