How to draw a simple javascript pie chart ?

[glops]

Hi I try to make a survey from an XML (all the questions)...and that is ok

then at the end I would like to display a little pie chart..like a simple
www.scriptol.com/html5/canvas/circle.php

function pie(ctx, w, h, datalist)
{
 var radius = h / 2 - 5;
 var centerx = w / 2;
 var centery = h / 2;
 var total = 0;
 for(x=0; x < datalist.length; x++) { total += datalist[x]; };
 var lastend=0;
 var offset = Math.PI / 2;
 for(x=0; x < datalist.length; x++)
 {
   var thispart = datalist[x];
   ctx.beginPath();
   ctx.fillStyle = colist[x];
   ctx.moveTo(centerx,centery);
   var arcsector = Math.PI * (2 * thispart / total);
   ctx.arc(centerx, centery, radius, lastend - offset, lastend + arcsector - offset, false);
   ctx.lineTo(centerx, centery);
   ctx.fill();
   ctx.closePath();
   lastend += arcsector;
 }
}

var datalist= new Array(35, 25, 20, 12, 7, 1);
var colist = new Array('blue', 'red', 'green', 'orange', 'gray', 'yellow');
var canvas = document.getElementById("canvas3");
var ctx = canvas.getContext('2d');
pie(ctx, canvas.width, canvas.height, datalist);
1st... do I need to declare canvas3 in the html body part in the movie ? Where do I need to save the js ?

I have tried tons of things and I'm unable to display a chart...
document.getElementById is not recognized

Do you have an example of such feature or how to easily call jQuery or JavaScript real functions ?
thanks

[Hippani]

jquery is pretty much incompatible. The best way to use this sort of thing is with the web page object which allows you to embed a separate page.

Charts are another thing on our list. I'll +1 the suggestion.

You could always try using the 'segment' shape to create a pie chart, but it would be difficult to make that dynamic.