PL-900 Demonstrate the capabilities of Power Apps Practice Question
A company uses a Power App to track inventory. The app displays a gallery of items filtered by a dropdown. When the user selects 'Electronics', the gallery shows all electronics items. However, after the user clears the dropdown, the gallery remains empty. What is the most likely reason?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The gallery's Items property uses a filter that references Dropdown.Selected.Value, and when the dropdown is cleared, the filter returns blank
When the dropdown is cleared, Dropdown.Selected.Value becomes blank. The gallery's Items property uses a filter that references this value, so the filter returns blank (no items), causing the gallery to be empty. Option A is incorrect because AllowEmptySelection set to false would prevent clearing, not cause emptiness after clearing. Option B is incorrect because the data source does not require a refresh; the issue is the filter logic. Option D is incorrect because OnStart is not involved in the clearing behavior.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The dropdown's AllowEmptySelection property is set to false
Why it's wrong here
AllowEmptySelection only controls whether user can clear; it doesn't affect filter
- ✗
The data source requires a refresh after clearing selection
Why it's wrong here
Refreshing data source won't fix filter issue
- ✓
The gallery's Items property uses a filter that references Dropdown.Selected.Value, and when the dropdown is cleared, the filter returns blank
Why this is correct
When no selection, Dropdown.Selected.Value is blank, filter returns no items
- ✗
The app's OnStart property is clearing the data source
Why it's wrong here
OnStart runs once at start, not on dropdown change
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