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How do I reset a combo box when another combo box is selected?

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Posted on by futr_vision

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I have this working fine with a new form. I use the OnChange to reset a proceeding combo box since the proceeding combo box is also dependent. I run into issues when I get to the screen where I populate an edit form with a gallery selection. That same code used to reset doesn't work. Does it have to do with me using DefaultSelectedItems? The combo box where the reset works uses Items. Maybe I am looking in the wrong place.

Combo Box 1

OnChange

Reset(CB_CampaignSourceReview)

Combo Box 2 (dependent)

DefaultSelectedItems

LookUp(Distinct('Campaign Sources', 'Campaign Source Name'), Value = Parent.Default)

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Building Power Apps

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futr_vision 831 Moderator on at

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UPDATE:
It looks like when I submit the form the combo box is actually cleared as I do not see an entry in the database and when I select the item from the gallery the combo box is not populated with any values. This seems like a UI issue then?

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v-qiaqi@microsoft.com Microsoft Employee on at

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HI @futr_vision,

This is not a UI issue, the issue is the way you reset the ComboBox.

The OnChange property fires once the ComboBox selected changes, on your side, it reset the selected item to the default mode, not clear the selected items from ComboBox.

In another word, reset action is to reset the control back to the default situation, which depends on how you set the default value of the combobox.

By the way, sometimes, Power Apps does not recognize the Parent.Default

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futr_vision 831 Moderator on at

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Sorry for the delay. Thanks for the info. That makes sense. Is there a way to blank out the combo box then? Perhaps by using the Blank() function?

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