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jquery submit form with button on event change

when a checkbox is checked, i want the form to submit. However I need parameters contained in my submit button to be part of the request.
This bit of script submits the form but not using the button. I guess because jquery submits it some other way.
$(e.target).find("input[type='radio']").attr("checked", true)
$(".edit_booking").submit()
I've tried pointing jquery to the button containing the params via it's ID and using a click event, but this doesn't work either.
$(e.target).find("input[type='radio']").attr("checked", true)
$("#bookings_next").click()
Bits of the form:
<form novalidate="novalidate" class="simple_form edit_booking" id="edit_booking_9486" action="/venues/plymouth/bookings/9486" accept-charset="UTF-8" method="post">
.............
<input type="submit" name="forward_button" value="Next step" id="bookings_next" />
Many thanks

aha, simple!
$('#bookings_next').trigger('click');
I have to trigger the event.

How can i fire a function inside an input-field? or a default button with that function without actually submitting?

It works:
When the button is used
The problem is:
When pressing enter inside the text-field, the default action seems to be submit. I just want it to use the button available as default. Is this possible or will i have to highjack the enterpress with javascript?
Code:
<form>
<label>Password:<input type="password" id="pass" name="pass"></label>
<input type="button" value="hämta data" onclick="getData('password.txt')"/>
</form>

By default, pressing Enter in the last field of a form submits the form. Try this:
<form onsubmit="return false;">
so that submitting the form doesn't do anything.

How do I detect how a form was submitted via JavaScript?

I have a form with multiple submit buttons and I'm listening for the 'submit' event via JavaScript. I want to know which submit button or form field (if the user pressed 'Enter/Return') triggered the submit event. Is there a way to get the HTML element that the user clicked on or pressed 'Enter/Return' in?
Update since people aren't understanding me:
This is via JavaScript before the form is submitted. No server-side detection allowed. I also need to handle the form being submitted via the user pressing Enter or Return.
Code
<form action="" method="POST">
<input type="text" name="first_name">
<input type="text" name="item">
<input type="submit" value="Add item">
<input type="submit" value="Submit">
</form>
Clicking 'Add Item' or pressing Return/Enter inside name="item" will add another form field.
Final Note
As far as I can tell, there isn't a way to detect which form field triggered a form submission. If you need to prevent submitting a form that has multiple buttons and/or from Enter/Return, you'll need to use <input type="button"> and bind event handlers to the form fields you want to stop form submission from.

If you have multiple submit buttons, the way you can tell is by giving each of them a unique name attribute, like this:
<input type="submit" name="submit1" value="Submit 1"/>
<input type="submit" name="submit2" value="Submit 2"/>
<input type="submit" name="submit3" value="Submit 3"/>
The one that is focused is sent along with the form submit, so if you clicked the one with a name of "submit2", that would come through in the form POST (or GET). If enter is hit, the first button in the source (in this case submit1) is considered the default and is sent along. You could set it to display:none to use as a dummy for detecting whether enter was pressed vs actually clicking a submit button.
EDIT:
In response to your comments, to capture the enter key getting pressed in certain elements you can do this with jQuery.
Note, you'll need to give first_name and add_item id attributes, and turn add_item into a type="button" instead of type="submit".
HTML:
<form action="" method="POST">
<input type="text" name="first_name"/>
<input type="text" id="item" name="item"/>
<input type="button" id="add_item" value="Add item"/>
<input type="submit" value="Submit"/>
</form>
JS:
$("#item").keydown(function(event){
if(event.keyCode == 13) {
addFields();
event.preventDefault();
event.stopPropagation();
}
});
$("#add_item").click(function(event) {
addFields();
});

You could set the onclick event on each element you are interested and call a javascript function with a different parameter for each element clicked.
From that function you send the idendifier of the button to the server side as a parameter

Just put a different name on each submit button, whichever one was clicked will be submitted (i.e. its name/value pair) with the form. Forms have worked like this since the begining of (WWW) time.
If the form is sumitted by enter or other keypress, no the first submit button name/value pair will be submitted.
Edit
Re-reading your question, you may want to determine how the form was submitted before it is sent. A click listener on the form can remember the last submit button clicked, but in Firefox, pressing enter in an input dispatches a fake click on the first submit button so you can't detect it.
I think you can't do it reliably other than using the basic method suggested above or Jordan's hidden submit button. If you say why you need to do this, perhaps more help can be provided.

here's an option if you don't mind using jQuery:
example: http://jsfiddle.net/U4Tpw/
use something like
$('form').submit(function() {
// identify the form by getting the id attribute
handleWhichForm($(this).attr('id'));
});

Posting a form with hidden fields without submit button click

I have a form as
<form action="" method="post">
<input name="Descripcion" type="hidden" value="" id="Descripcion" runat="server" />
<input id="Submit1" type="submit" value="Comprar" />
Instead of clicking on submit button i want that the form should be posted without clicking submit button with hidden fields

You can submit an html form from javascript by calling the form's .submit() method. e.g.:
document.getElementById('myform').submit();
Of course, you still need an action in your example so the form has somewhere to submit itself to. Also, you tagged your question asp.net. If this is a webforms page you should use the default form rather then adding your own form to the html markup. You submit the asp.net form by calling the __doPostBack() method.

you can build and submit a form with javascript you can call from other events or when loading a page
myform=document.createElement('form');
myform.method='post';
myform.target='_top';
myform.action='';
input1=document.createElement('input');
input1.type='hidden';
input1.name='Descripcion';
input1.value='';
myform.appendChild(input1);
document.appendChild(myform);
myform.submit();

You can also accomplish the same using jQuery:
$('myform').submit();

does the submit button have to be contained in the form

I want my submit button to be positioned somewhere that outside my form element? Do I have any options? With the exception of jquery.
Thanks,
rodchar

Another approach to this is merely to set the form attribute on the button:
<form id="first">
<input type="submit" form="second" value="Submit Second" />
</form>
<form id="second">
<input type="submit" form="first" value="Submit First" />
</form>
Fiddle: http://jsfiddle.net/52wgc2ym/
Original Answer
The natural behavior of a submit button is to submit the nearest form up its hierarchy. The only other way to get a button to submit a form which it doesn't reside in is to use JavaScript (which is what jQuery is, basically).
If necessary, you could reposition the submit button so that it appears as though it's not in the form visually when the page is rendered. You would do this using CSS, which may give the desired result(s).

The submit button needs to be inside the form, yes.
It seems strange to me to want it any other way, anyway. What would be the point if the input controls were in one place on the page, and the submit button was waaay over there somewhere else?

Yes, structurally the submit button needs to be inside a form element for the document to be valid X/HTML. But visually you can position the submit button anywhere you want with appropriate CSS (float, absolute/relative positioning, etc). You could also write JavaScript that will trigger the form submission and tie it to another element.

This is a common situation. I think this will do it (haven't tested it):
<form id="form1" action="someAction.cgi" method="GET">
<!-- other fields go here -->
</form>
<form id="form2" action="someOtherAction.cgi" method="GET">
<!-- other fields go here -->
</form>
<form>
<input value="Form One" type="button"
onclick="document.getElementById('form1').submit();"/>
<input value="Form Two" type="button"
onclick="document.getElementById('form2').submit();"/>
</form>
I'm not sure if you need that last <form>. I seem to remember browsers ignoring events if the button wasn't in a form.

Inputs of type submit only make sense as children of <form> elements. But using CSS I'm sure you can position it wherever you like. Remember form elements are "invisible" so just expand the tags around more of your content and you're covered. Here's the documentation on forms for HTML4, it's still appropriate.

This is the another type of answer getting more clear view from egrunin answer
<form id="form1" name="form1" action="someAction.cgi" method="GET">
<!-- other fields go here -->
</form>
<form id="form2" name="form2" action="someOtherAction.cgi" method="GET">
<!-- other fields go here -->
</form>
Calling by form id:
<form>
<input value="Form One" type="button"
onclick="document.getElementById('form1').submit();"/>
<input value="Form Two" type="button"
onclick="document.getElementById('form2').submit();"/>
</form>
or Calling by form name:
<form>
<input value="Form One" type="button"
onclick="document.form1.submit();"/>
<input value="Form Two" type="button"
onclick="document.form2.submit();"/>
</form>