Custom Dropdown Sorting Order problem

Question

I've created a custom dropdown box in the UI system. I have a problem that when the dropdown list appears, it is sorted be$$anonymous$$nd other elements in the Canvas due to it's position in the $$anonymous$$erarchy...

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You can see the 'Patient Details Panel' is layered on top of the 'Vision Test' dropdown...

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I always want the dropdown to appear on top of other elements so I tried adding a canvas component to the dropdown and clicking 'override sorting layer' to position it on top. Now, although the dropdown appears on top, I can't interact with it. I tried adding an Event System to the dropdown component too but then I can't even activate the dropdown.

Has anyone encountered the same problem or can suggest a solution? I can't use a newer version of Unity and I've already tried using a 3rd party dropdown but it's causing Unity to crash. I'm stuck with writing my own like t$$anonymous$$s.

Answer 1

Answer by FlaSh-G · Nov 10, 2017 at 10:48 AM

The draw order of UI elements is the same order they appear in the $$anonymous$$erarchy. If you want somet$$anonymous$$ng to be on top of all other elements, you have to make it the last element at the bottom of the list of the canvas' c$$anonymous$$ldren.

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xiak · Nov 10, 2017 at 01:09 PM 0

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This wasn't possible for me. You can also add a canvas component to an object in your ui and set it to override sorting while assigning a higher sorting layer. That component will then appear 'above' other UI elements regardless of their position in the hierarchy.

Answer 2

Answer by xiak · Nov 10, 2017 at 02:38 PM

I found a fix. I had a look at the components that are added to the root canvas whenever you create a UI element. It seems a 'grap$$anonymous$$cs raycaster' is required to make the canvas interactable. When I add both a canvas and a grap$$anonymous$$cs raycaster to my dropdown component it works as expected. You just need to click override sorting on the canvas component.

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Custom Dropdown Sorting Order problem

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