When the CSS visible property is set to false, do controls in Firefox still respond to mouse events?

Currently encountering an issue with FIREFOX. There seems to be an invisible list control above a drop-down control (html 'select'). The hidden layer is actually a pop-up that is part of another customized control.

Despite its invisibility, it is causing hindrance in clicking on the underlying drop-down control, giving the impression that the underlying control is disabled. However, it is not disabled as one can still tab over to it. Clicking seems impossible due to the overlay's interference, evident when shifting the underlying control aside resolves the problem.

Could this be a Firefox bug? This scenario does not involve setting a translucency value; instead, it completely inhibits rendering of the control, suggesting that such an invisible element shouldn't intercept mouse events. Interestingly, Internet Explorer does not exhibit this behavior.

Is there a CSS property or JavaScript code that could toggle the visibility and mouse event capturing ability simultaneously?

dd = document.getElementById('lstStudents');
if (dd.style.visibility == 'hidden') dd.style.visibility = 'visible'; else dd.style.visibility = 'hidden';

Update: After reading about the CSS visibility value "hidden", which mentions "The element is invisible (but still takes up space)", I may need to set its height to zero along with adjusting its visibility to resolve the issue.

cssfirefoxdrop-down-menumouseeventvisibility

Answer №1

To gain direct access to the drop-down, try setting your over-layer control's z-index to a negative number like -1. This will position it below everything else on the page. Remember to adjust the z-index dynamically when needed to bring the over-layer back to the top.

Learn more

Answer №2

Are you concealing the element in a specific way? I believe "visibility: hidden" is intended to function as you've described, while "display: none" completely removes it from rendering.

If this isn't the issue, can you verify with Web Developer Toolbar that the problematic control is indeed the invisible one and not another with an opacity of 0 or something similar?

Answer №3

In the past, I have created popup boxes in Firefox using CSS properties.

z-index: 500;
display: block;

to make an element visible, and

z-index: -10;
display: none;

to hide it.

Although my z-index values are on the extreme side, this approach has worked well for me in the past. However, it is important to note that my application was specifically targeted for Firefox. Additionally, I am using the display property, which you mentioned wanting to avoid.

If you are hesitant about using display:block or display:hidden, you could consider experimenting with positioning or adjusting the size of the element instead.

One option is to set the popup element to be absolutely positioned and move it offscreen when not in use. Alternatively, you could try setting its width and height to 0px when hidden. These are potential solutions worth exploring, although I cannot guarantee they are the best options.

Take into account how many different display values your popup elements will have. In my experience, I typically only used 'none' and 'block'. Manipulating the display property may suffice for your needs.

I hope these suggestions prove helpful to you.

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