Submitting form with AJAX without button - php

Question

I'm trying to send a form with AJAX and without submit button. Everything works just fine with submit button, but if I try to submit the form by clicking something else it won't work.
I searched for an answer for quite a while, but didn't find anything useful so far.
function ajaxSubmit(){
var showHideForm = jQuery('#dashboard-hki-subjects-form').serialize();
$.ajax({
type:"POST",
url: "/wp-admin/admin-ajax.php",
data: showHideForm,
success:function(data){
$('#formMessage').html(data);
}
});
return false;
}
$('.show-hide-subject-button').click(function(){
var subject = $(this).attr('subject');
$('#hide-subject').attr('value',subject);
});
$('#dashboard-hki-subjects-form').submit(ajaxSubmit);
I'm using Wordpress, so the AJAX is handeled with admin-ajax.php.

Answer 1

What if you just use an enter key handler...
Try this:
<input type="text" name="txt"/>
$('#txt').keydown(function (e){
if(e.keyCode == 13){
console.log('you pressed enter!'); //prints to the browser console...
ajaxSubmit(); //the function you described in your question...
}
})

Answer 2

You have to bind the ajaxSubmit() to whatever there is you're clicking, otherwise there simply will be nothing on your page to trigger it. E.g., if you want your form to be submitted whenever you click on the .show-hide-subject-button element, you have to call ajaxSubmit() explicitly:
$('.show-hide-subject-button').click(function(){
var subject = $(this).attr('subject');
$('#hide-subject').attr('value',subject);
ajaxSubmit();
});