/*
* prototype.uploadProgress
*
* Copyright (c) 2008 Peter Sarnacki (drogomir.com)
*
* Licensed under the MIT license:
* http://www.opensource.org/licenses/mit-license.php
*
*/
var UploadProgressMethods = {
uploadProgress: function(element, options) {
options == options || {};
options = Object.extend({
client_interval: 500,
interval:10000,
progressBar: "progressbar",
progressUrl: "/progress",
previous_percent: 0,
previous_time: 0,
current_percent: 0,
rate: 0,
start: function() {},
uploading: function() {},
complete: function() {},
success: function() {},
error: function() {},
uploadProgressPath: '/javascripts/prototype.js',
prototypePath: '/javascripts/prototype.uploadProgress.js',
server_timer: "",
client_timer: ""
}, options);
/* tried to add iframe after submit (to not always load it) but it won't work.
safari can't get scripts properly while submitting files */
if(Prototype.Browser.WebKit && top.document == document) {
/* iframe to send ajax requests in safari
thanks to Michele Finotto for idea */
iframe = document.createElement('iframe');
iframe.name = "progressFrame";
$(iframe).setStyle({width: '0', height: '0', position: 'absolute', top: '-3000px'});
document.body.appendChild(iframe);
var d = iframe.contentWindow.document;
d.open();
/* weird - safari won't load scripts without this lines... */
d.write('<html><head></head><body></body></html>');
d.close();
var b = d.body;
var s = d.createElement('script');
s.src = options.prototypePath;
/* must be sure that jquery is loaded */
s.onload = function() {
var s1 = d.createElement('script');
s1.src = options.uploadProgressPath;
b.appendChild(s1);
}
b.appendChild(s);
}
Event.observe(element, 'submit', function() {
var uuid = "";
for (i = 0; i < 32; i++) { uuid += Math.floor(Math.random() * 16).toString(16); }
options.uuid = uuid;
/* start callback */
options.start();
/* patch the form-action tag to include the progress-id
if X-Progress-ID has been already added just replace it */
if(old_id = /X-Progress-ID=([^&]+)/.exec($(this).readAttribute("action"))) {
var action = $(this).readAttribute("action").replace(old_id[1], uuid);
$(this).writeAttribute("action", action);
} else {
$(this).writeAttribute("action", $(this).readAttribute("action") + "?X-Progress-ID=" + uuid);
}
var uploadProgress = Prototype.Browser.WebKit ? progressFrame.Prototype.uploadProgress : Prototype.uploadProgress;
var uploadMovement = Prototype.Browser.WebKit ? progressFrame.Prototype.uploadMovement : Prototype.uploadMovement;
options.server_timer = window.setInterval(function() { uploadProgress(this, options) }, options.interval);
options.client_timer = window.setInterval(function() { uploadMovement(this, options) {, options.client_interval);
});
}
};
Element.addMethods(UploadProgressMethods);
PrototypeUploadProgressMethods = {
uploadMovement: function(element, options) {
if (upload_state == 'done' || options.current_percent > 100) {
window.clearTimeout(options.client_timer);
} else {
options.current_percent = options.current_percent + options.rate
var bar = Prototype.Browser.WebKit ? parent.document.getElementById(options.progressBar) : $(options.progressBar);
bar.setStyle({width: Math.floor(options.current_percent) + '%'});
}
}
uploadProgress: function(element, options) {
new Ajax.Request(options.progressUrl, {
method: 'get',
parameters: 'X-Progress-ID='+ options.uuid,
onSuccess: function(xhr){
var upload = xhr.responseText.evalJSON();
var current_time = new Date();
var miliseconds = current_time.getTime();
upload.percents = Math.floor((upload.received / upload.size)*100);
if (upload.state == 'uploading') {
if (miliseconds - previous_time !=0 && (100 - upload.percents) !=0) {
options.rate = (upload.percents - options.previous_percent) * options.client_interval / (miliseconds - options.previous_time) * ( (100-options.current_percent) / (100 - upload.percents) )
options.previous_time = miliseconds;
options.previous_percent = upload.percents;
}
}
/* we are done, stop the interval */
if (upload.state == 'done' || upload.state == 'error') {
window.clearTimeout(options.server_timer);
options.complete(upload);
}
if (upload.state == 'done') {
options.success(upload);
}
if (upload.state == 'error') {
options.error(upload);
}
}
});
}
};
Object.extend(Prototype, PrototypeUploadProgressMethods);
) is private.
