fix(popover): viewport can be scrolled if no content present #29215
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liamdebeasi changed the title 
liamdebeasi commented Mar 25, 2024
core/src/css/core.scss Outdated
| * we should fallback to the old behavior for environments that do not support :has. | ||
| * Developers can explicitly enable this behavior by setting overflow: visible | ||
| * on .popover-viewport if they know they are not going to use an ion-content. | ||
| * TODO FW-XXXX Remove this |
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If the team is on board with this approach, I'll make a tech debt ticket and populate the ticket number here.
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Also good with this approach 👍
| As for tests, could we do one of the following:
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| Good idea! I added a similar test to the PR. |
averyjohnston approved these changes Apr 1, 2024
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Issue number: resolves #29211
What is the current behavior?
In #28861 I fixed a bug that caused
.popover-viewportto haveoverflow: hidden. In reality, this code should have always applied but due to an incorrect selector it never did.As it turns out in #29211, some developers were relying on the broken behavior to build their applications. In particular, developers were using
ion-popoverwithout anion-content. The linked change made it so that using popovers withoution-contentwere not scrollable.After talking with @mapsandapps we think it makes sense to officially support this behavior. We support using modals without
ion-content, and we could not think of a reason to not support the same use case for popover.What is the new behavior?
.popover-viewportelement has a child content then.popover-viewportwill not be scrollable..popover-viewportelement does not have a child content then.popover-viewportwill be scrollable.I implemented this behavior using progressive enhancement via
:has. The:haspseudo-class has cross-browser support. Ionic v7 supports some versions of browsers that do not have:hassupport. As a result, we fall back to the existing behavior in this environment. Developers are able to get this behavior on older browsers by explicitly settingoverflow: autoon.popover-viewport.Fortunately, we will be dropping support for several of the older browsers versions in Ionic v8, so the need to do the manual opt-in should be less frequent as time goes on.
Does this introduce a breaking change?
Other information
Dev build:
7.8.2-dev.11711383079.118d48a5Testing:
I could not find a great way to automate this test, but let me know if anyone has ideas!