Asp.net menu dropdown behind canvas (gojs)

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I have a webforms asp.net website which is using the standard menu control. we have a page that contains a html5 drawing canvas which is for gojs charting. When the menu expands, it seems to appear in front of the canvas itself, but behind any objects on the canvas.. but, where any part of the menu item is over the canvas, then the menu hover doesn't work. I've set every part of the menu control to z-index 100 and the same for its div container and the canvas seems to have a z-index of 2.

Any tips for finding out why the menu control isn't at the front ?

What I have tried:

I've tried changing all of the menu classes to have a z-index of 100

Posted 23-Jun-22 3:57am

Alaren

Updated 23-Jun-22 23:08pm

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Richard Deeming 24-Jun-22 4:53am

The z-index can get quite tricky:
What The Heck, z-index??[^]
The stacking context - CSS: Cascading Style Sheets | MDN[^]

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Alaren · Answer 1 · 2022-06-23T23:08:00

Solution 1

Aha, found it, the menu needed to have the postition:relative added to make the z-index work.

Posted 23-Jun-22 23:08pm

Alaren