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Getting mouse coordinates within a canvas


phpknight

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I'm having trouble figuring this one out because the mouse coodinates don't match in different browsers.  Firefox seems to be giving me a number from the start of the client window, but IE gives me numbers from the start of the containing object.

 

In short, what I am looking to do is have an art canvas somewhere inside a website.  When a user clicks on the top left corner, I want all browsers to give me 0, 0.  Let's say the canvas is 500x500.  When the user clicks the center, it should return 250, 250.  I'd like this to work similarily on all browsers.  However, when looking at the DOM inspector in Firefox, I can't see a way to do it.

 

Also, if anybody knows of a good, free DOM inspector for IE, please let me know.

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