Question about cakephp forms and JS

Hi,

I am trying to make a form which collects data on submit. Maybe someone can help me.

I have a  <canvas id="canvas">

Then I have a form:

<?php

echo $this->Form->create('Drawing');

echo $this->Form->input('id');

echo $this->Form->input('name');

echo $this->Form->input('description');

echo $this->Form->input('canvas');

echo $this->Form->end(__('Submit'));

?>

When the user clicks submit, I want the page to collect the canvas data, and send it along with the rest of the post data.

How would I do this?

var canvas = document.getElementById('canvas');

var dataURL = canvas.toDataURL();

Also after submit I would like to store it. Normally I use the upload plugin from Jose gonzalez, but not sure if it can handle the raw data. So maybe I need save it first to the server. This will not be a problem. The main problem is how I can get the dataURL into the forms canvas. 

Greets,
Thomas

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