J I C

J I C is a Javascript Image Compressor using HTML5 Canvas & File API that allows you to compress your jpeg & png images before uploading to the server (100% client-side and no extra libraries requried!)

Could you imagine how much bandwidth we can save if Google, Twitter and r Facebook implement this image compression before we upload those 5MB photos? This approach will make the internet faster!!

You can check the working demo here : http://makeitsolutions.com/labs/jic/

How it works

To compress the image (and resize), first it converts an image object to canvas and then compress it with the canvas method toDataURL(mimetype, quality)

Then to upload the image object it uses the XMLHTTPRequest method sendAsBinary and sends the data url of the compressed image to the server and that's all!! Easy huh?

Example

J I C has only 3 methods: isSupported, compress & upload. Check it out:

//========= Step 1 - Check for browser support ===========

if(!jic.isSupported()){
  // canvas.toDataURL is not supported
  // fallback...
  return;
}

//========= Step 2 - Client Side Compression ===========

//Images Objects
var source = document.getElementById("source_img"),
    target_img = document.getElementById("target_img");

//(NOTE: see the examples/js/demo.js file to understand how this object could be a local image 
//from your filesystem using the File API)

var quality =  80, //An Integer from 0 to 100
  output_format = 'png', // output file format (jpeg || png)
  max_width = 1024, // An Integer, max width size constraint image proportions
  max_height = 768;

//This function returns an Image Object 
target_img.src = jic.compress(source_image, quality, output_format, max_width, max_height).src;  


//======= Step 3 - Upload compressed image to server =========

//Here we set the params like endpoint, var name (server side) and filename
//additional_data param is optional
var server_endpoint = 'upload.php',
	server_var_name = 'file',
	filename = "new.jpg",
	additional_data = {
	  description : 'new.jpg file description'
	};

//This is the callback that will be triggered once the upload is completed
var callback = function(response){ console.log(response); }

//Here goes the magic
jic.upload(target_img, server_endpoint, server_var_name, filename, additional_data, callback);

Enjoy!

Issues (mostly on iOS and Android devices)

It does not work on iOS Safari. First time a new image is loaded canvas.toDataUrl returns data:;; tried to fix it adding an onload event handler to the new created image but it doesn`t work either. Also:

davidfq/J-I-C

J I C

How it works

Example

Issues (mostly on iOS and Android devices)