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09/15/2001 at 10:32PM PDT, ID: 20183355
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8.2

Capturing Event's X/Y Coordinates in Netscape 6

Asked by awalters in JavaScript

Tags: coordinates

I want to capture x and y coordinates of a user?s click inside a graphic image (relative to its upper left corner) in Netscape 6. Making the graphic an image map would accomplish this, but I want to capture the coordinates without reloading the page.

It's easy in IE 5+, using event.offsetX, but this isn't available in Netscape 6. I used the following alternative in Netscape:

     xPosition = event.clientX - (document.getElementById("clickfield").offsetLeft);

     yPosition = event.clientY - (document.getElementById("clickfield").offsetTop);



However, this only works if the user doesn?t scroll before clicking. Here?s why:

event.clientY is the click event?s y-offset relative to the *browser* frame. This value is altered when the user scrolls.

document.getElementById("clickfield").offsetTop is the graphic's y-offset relative to the *page*. This value remains unchanged regardless of whether the user has scrolled.

Since the two values I rely on respond differently to scrolling, I only get the correct value if the user has not scrolled.



Points to anyone who can tell me how to do this in Netscape 6, in a manner that works even if the user has scrolled. Please also recommend any resources that provide information on event properties such as event.clientX and others in Netscape 6.

Thank you,

awalters
 
Keywords: Capturing Event's X/Y Coordinates i…
 
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Zone: JavaScript
Tags: coordinates
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Solution Provided By: ahosang
Participating Experts: 3
Solution Grade: A
 
 
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