Bug 54636 – Area element doesn't update region when dynamically altered

• Component: Images
• Status: RESOLVED FIXED

If you create an image map with an area, and then you change the coordinates for that area after you have moved the mouse over it, then the area will not update to the new coordinates.

In the following example, there is a single area to the left of the image. If you click on it, the area should move to the right, but it doesn't.

<img ismap usemap="#map1" style="width:200; height:100"/>
<map name="map1">
<area id="area1" shape="rect" coords="0,0,100,100" href="#" title="xx"/ onclick="document.getElementById ('area1').coords = '100,0,200,100'">
</map>

I believe the bug lies in HTMLAreaElement.cpp in the mapMouseEvent() function.
It only recreates the region for the area if the associated image size changes.
If I resize the image as in the code below, then it works.

<img id="image1" ismap usemap="#map1" style="width:200; height:100"/>
<map name="map1">
<area id="area1" shape="rect" coords="0,0,100,100" href="#" title="xx"/ onclick="document.getElementById ('area1').coords = '100,0,200,100'; document.getElementById ('image1').style.width = 201">
</map>

The code needs changing to recalculate the region when the shape type or coordinates of the area have changed since the last call.
i.e. add a recalculate flag that gets set when either of these attributes change.

[Xavi]

I've also ran into this problem.  Here's a page that reproduces this bug:

http://xavi.co/static/image-map-test.html

Also here's a link to a chromium bug reporting the same issue: 

http://code.google.com/p/chromium/issues/detail?id=34530

[Andreas Kling]

Created attachment 93764 [details]
Proposed patch

[Kenneth Rohde Christiansen]

Comment on attachment 93764 [details]
Proposed patch

View in context: https://bugs.webkit.org/attachment.cgi?id=93764&action=review

> LayoutTests/fast/images/script-tests/imagemap-dynamic-area-updates.js:7
> +image.setAttribute('usemap', '#m');

So long since I have used this :-)

> LayoutTests/fast/images/script-tests/imagemap-dynamic-area-updates.js:72
> +var successfullyParsed = true;

Who sets this to false in case of failure? Is that handled by the wrapper?

[Andreas Kling]

(In reply to comment #3)
> > LayoutTests/fast/images/script-tests/imagemap-dynamic-area-updates.js:72
> > +var successfullyParsed = true;
> 
> Who sets this to false in case of failure? Is that handled by the wrapper?

Indeed! finishJSTest() in js-test-pre.js checks that successfullyParsed is true.

[Andreas Kling]

Comment on attachment 93764 [details]
Proposed patch

Clearing flags on attachment: 93764

Committed r86695: <http://trac.webkit.org/changeset/86695>

[Andreas Kling]

All reviewed patches have been landed.  Closing bug.