Question

How can I activate a “left” or “right” keyboard arrow push on click of a div.

So for example

$('.item').click(function(){
    keyCode(37);
});

(I know that 37 is left)

Answer 1

You would go like

$('.item').click(function(){
    $( document.body ).trigger({
        type: 'keypress',
        which: 37,
        keyCode: 37
    });
});

You can of course replace document.body with any other node that has a keypress or keydown event bound to it.

Reference: .trigger()