iframe .click() and .trigger() won't work in firefox v 4 below

I have an iframe on my site, in the iframe I put a button to trigger the

<input type="file">

These are the elements:

button id="click"

input type="file" id = "file"

This is the script code:

 $("#click").click(function() {
$(开发者_如何学运维'#file').trigger('click');
 });

I also replace the .trigger into .click(); but nothing happens

Just remove commas.Try like this

assign button id="click1"

 $("#click1").click(function() {
$("input").trigger('click');
 });