jQuery AJAX form submits twice

As well as calling preventDefault, also call stopImmediatePropagation on the event.

$('#exportForm').submit(function(e){    e.preventDefault();    e.stopImmediatePropagation();    $.ajax({        type: "POST",        url: $(this).attr( 'action' ),        data: $(this).serialize(),        success: function( response ) {            console.log( response );        }    });    return false;});

It's most likely that you're using a button or submit to trigger the ajax event. Try this:

$('#exportForm').submit(function(e){        e.preventDefault();        $.ajax({            type: "POST",            url: $(this).attr( 'action' ),            data: $(this).serialize(),            success: function( response ) {                console.log( response );            }        });        return false;    });

In case you are using some kind of validation (e.g jQuery Validation), the form is submitted twice because aside from $('#exportForm').submit you write yourself, the validation plugin will also submit the form after it successfully validates all field.

NB : If you are using jQuery Validation, avoid using .submit(). Instead, use submitHandler.