Trigger file input dialog

Question

How can I auto trigger file input? ie. in the link below I want to trigger upload button on load

DEMO

Answer 1

$("document").ready(function() {
    setTimeout(function() {
        $("#test1").trigger('click');
    },10);

    $('#test1').click(function(){
        alert('hii');
    })
});

click event triggerd.

http://jsfiddle.net/j9oL4nyn/1/