jQuery file upload: Is it possible to trigger upload with a submit button?

Question

I\'m using jQuery file upload for AJAX-based uploads. It always starts uploading after a file is selected. Is it possible to change the behavior to use the \"submit\"-button

Answer 1

if you have the button

<button id="up_btn">Upload</button>

You can try with

$('#fileupload').fileupload({
    dataType: 'json',
    add: function (e, data) {            
        $("#up_btn").off('click').on('click', function () {
            data.submit();
        });
    },
});

EDIT: according to comments a better answer considere off to avoid duplicated requests. (also work unbind, I do not check if is bind and unbind but jquery team recommend on and off link since 1.7)

Answer 2

None of these answers will work for multiple file uploads. My case involved allowing multiple attachments in a comment thread. So I needed to save the comment first to get the id, and then upload and save all the attachments. This seems like a trivial thing, but with this plugin its not that intuitive. My solution uses custom events in jQuery, and works great.

The currently accepted answer binds to the click event of a button in the 'add' callback, but the 'add' callback is called once for each file. If you unbind all the events each time only the last file will upload.

$('#fileupload').fileupload({
    dataType: 'json',
    add: function (e, data) {
        $("#up_btn").on('customName', function (e) {
            data.submit();
        });
    },
});

By binding the submit button to a custom name, we can do whatever preprocessing we want before submitting the images. In my case it involved submitting the comment and getting back the comment id which I did in a separate call. This code just responds to the click, but you can do whatever you want before triggering the event.

$("#up_btn").on('click', function (e) {
    e.preventDefault();
    $("#up_btn").trigger( "customName");
});

You can pass any data you want when you trigger the event, so it really gives you complete control over your form.