PercentageLoader

Introduction

PercentageLoader is a plugin with optional jQuery support for displaying a progress widget in more visually striking way than the ubiquitous horizontal progress bar / textual counter. The plugin takes miniminal installation and is simple and flexibile to use. It makes use of HTML 5 canvas for a rich graphical appearance with only a 10kb (minified) javascript file necessary (suggested web font optional). It uses vectors rather than images so can be easily deployed at various sizes by simply adjusting the initial parameters. For a live demo please see http://widgets.better2web.com/loader

Requirements

• jQuery 1.4+ (if using the jQuery interface)
• Firefox 3.0+, Safari 4.0+, Chrome 7+, IE9+, Opera 9+

(i.e any browser with reasonable canvas support)

Licence

This jQuery plugin is licensed under the Simplified BSD License. Please see the file license.txt for full information on the licence.

Installation

1. Include the javascript file (a minified version is also provided)
2. You can also include the (optional but recommended web font) - Bebas Neue + fontkit CSS. This can found downloaded at http://www.fontsquirrel.com/fonts/bebas-neue
3. Run $.percentageLoader on any block element where you want the widget to appear if using jQuery, or simply var loader = new PercentageLoader(domElement, options)

Options include:

• progress (initial starting position of loader, range 0 - 1.0)
• value (initial label for the value)
• width (default 256)
• height (default 256)
• controllable (true/false, defaults to false) allows the user to set the value by clicking
• onProgressUpdate(value) - provide a callback function for controllable loaders with the updated value

Examples:

// jQuery
$("#myDiv").percentageLoader({
    width : 180, height : 180, progress : 0.5, value : '512kb'});
    
// Without jQuery
var loader = new PercentageLoader(
    document.getElementById('myDiv'), 
    {width : 180, height : 180, progress : 0.5, value : '512kb'});

You can update the values by using the same call if using jQuery, e.g.

$("#myDiv").percentageLoader({value: '250kb', progress: 0.5);

Otherwise, use the methods returned when you created the loader:

loader.setValue('250kb');
loader.setProgress(0.5);

You can handle updates with a user-controllable loader with a callback function:

var loader;
loader = $("myDiv").percentageLoader({
    controllable : true,
    onProgressUpdate : function (value) {
        this.setProgress(value * 100.0);
    }
});

Note how this in the callback is scoped to the underlying plugin object, where you can call setProgress and setValue directly.