HTML 5 click on section of canvas

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I have created an image and a load of functions, however I am not sure how to write a function that calls those functions when I click on certain areas of the canvas. For example if I wanted to make a small square of an image run a function rather than having the entire image run it.

If anyone could write some code to allow me to do this I would be very grateful. I have not managed to find anything helpful on google.

Posted 26-Nov-12 8:31am

IanMac91

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BC @ CV · Answer 1 · 2012-11-26T09:34:00

Try this. You can hack it with an image map overlayed. Make sure you set the z order of the canvas to put the blank image and its map on top.

XML

<!DOCTYPE html>
<html>
<body>

<p>Click on the canvas.</p>

<img width="398" height="398" alt="Canvas" usemap="#canvasmap" style="border:1px red solid"/>


<map name="canvasmap">
  <area shape="rect"   coords="0,0,50,50"      onclick="alert('You clicked area 1')" >
  <area shape="rect"   coords="100,100,50,50"  onclick="alert('You clicked area 2')" >
  <area shape="rect"   coords="300,300,50,50"  onclick="alert('You clicked area 3')" >
</map>

<CANVAS id='c1' width='402' height='402' style='border: 1px black solid;position:absolute;top:50px;left:6px;z-index:-1'>

</body>
</html>