jQuery HTML5 file drag and drop

Question

I have looked at many scripts for uploading images to the server with AJAX with drag and drop. The scripts I found are not jQuery, are quite large and don\'t do exactly what I w

Answer 1

I wrote an extension for my application.

// Custom file drop extension
$.fn.extend({
    filedrop: function (options) {
        var defaults = {
            callback : null
        }
        options =  $.extend(defaults, options)
        return this.each(function() {
            var files = []
            var $this = $(this)

            // Stop default browser actions
            $this.bind('dragover dragleave', function(event) {
                event.stopPropagation()
                event.preventDefault()
            })

            // Catch drop event
            $this.bind('drop', function(event) {
                // Stop default browser actions
                event.stopPropagation()
                event.preventDefault()

                // Get all files that are dropped
                files = event.originalEvent.target.files || event.originalEvent.dataTransfer.files

                // Convert uploaded file to data URL and pass trought callback
                if(options.callback) {
                    var reader = new FileReader()
                    reader.onload = function(event) {
                        options.callback(event.target.result)
                    }
                    reader.readAsDataURL(files[0])
                }
                return false
            })
        })
    }
})

And we can use it like this

// Event listener filedropper
$('.dropbox').filedrop({
    callback : function(fileEncryptedData) {
        // a callback?
    }
})

Edit

If you want to drop multiple files, you should write a for loop around the FileReader like so:

...
if(options.callback) {
    for (i = 0; i < files.length; i++) {
        var reader = new FileReader()
        reader.onload = function(event) {
            options.callback(event.target.result)
        }
        reader.readAsDataURL(files[0])
    }
}
...

JSFiddle: http://jsfiddle.net/646xe1m2/