There is now a standard submitter
property in the submit event.
Already implemented in firefox!
document.addEventListener('submit',function(e){
console.log(e.submitter)
})
in jQuery you just write
$(".myForm").on('submit', function(e){
e.originalEvent.submitter
});
for browsers not supporting it use this polyfill:
!function(){
var lastBtn = null
document.addEventListener('click',function(e){
if (!e.target.closest) return;
lastBtn = e.target.closest('button, input[type=submit]');
}, true);
document.addEventListener('submit',function(e){
if (e.submitter) return;
var canditates = [document.activeElement, lastBtn];
for (var i=0; i < canditates.length; i++) {
var candidate = canditates[i];
if (!candidate) continue;
if (!candidate.form) continue;
if (!candidate.matches('button, input[type=button], input[type=image]')) continue;
e.submitter = candidate;
return;
}
e.submitter = e.target.querySelector('button, input[type=button], input[type=image]')
}, true);
}();