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al_vlad
Frequent Visitor

app onstart value is null

hello! i have created app with excel online connect.  App contain form with dropdown visuals, some visuals contain filter. The app work fine, but when it start i see error: 

The requested operation is invalid. Server Response: Table13 failed: Expression "Platform eq null" is not supported

As far i understand i get this error because when app start my dropdown visual not contain value, but i don't understand how i can resolve this.

1 ACCEPTED SOLUTION

Accepted Solutions

Hi @al_vlad ,

 

Only because noticed Power Bi integration so I mentioned it. Maybe you are customizing the form from Power Bi? Is this form only use to edit data in Power BI? If so, there should be PowerBIIntegreated in Item property of the form which I'm not familiar with either. But you will have to test the app in Power Bi.

 

Anyway, since all the dropdowns depend on the one before, once a dropdown is empty all those below it would be empty as well. 

 

Let's try another method from the beginning:

1\ DataCardValue11 Items:

Distinct(Table13,Platforma)

 

2\ the second dropdown Items:

Distinct(
      Filter(
          Table13, 
          Platforma = If(IsBlank(DataCardValue11.Selected),
                         " ",
                         DataCardValue11.Selected.Result
                      )
      ),
      'Category'
)

 

Hope this helps.

 

Best regards,

Community Support Team _ Jeffer Ni
If this post helps, then please consider Accept it as the solution to help the other members find it.

Community Support Team _ Jeffer Ni

If this post helps, then please consider Accept it as the solution to help the other members find it.

View solution in original post

16 REPLIES 16

Try to change the Filter formula for Table13, I don't know what you have there but if you have "IF" function there, then change: IsEmpty(Dropdown.value)  to IsBlank(Dropdown.value) as it probably fails the check somehow, but without the Code of your Table13 ITEMS and Dropdown ITEMS I'm guessing blind.

Formula is simply 
Distinct(Table13,Platforma)

in another dropdown i use this formula:
Distinct(Filter(Table13, Platforma = DataCardValue11.SelectedText.Result),'Category')

Can you post screenshots? 

Which one of the above is Table13 Items formula?  Because in each you used Table13 as a source (that would be circular reference)

Distinct(Table13,Platforma) -----> here try:  If(!IsBlank(Distinct(Table13,Platforma)), Distinct(Table13,Platforma), "Test") 

and check if error still occurs,

 

BR

Zbigniew

al_vlad_0-1633696834664.pngal_vlad_1-1633696848769.png

 

Hi @al_vlad ,

 

The error came from the second Dropdown. Please check if the AllowEmptySelection property of the Dropdown1 is set to false, otherwise when the app starts DataCardValue11.SelectedText.Result will return null (not Blank(), null is not a acceptable value in Canvas Apps).

 

Hope this helps.

 

Best regards,

Community Support Team _ Jeffer Ni
If this post helps, then please consider Accept it as the solution to help the other members find it.

Community Support Team _ Jeffer Ni

If this post helps, then please consider Accept it as the solution to help the other members find it.

Hello @al_vlad,

 

you can try @v-jefferni comments and you can try using Reset Operation too to make it Blank.

 

Please mark as Answer if it is helpful and provide Kudos


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al_vlad_0-1633943129086.png

it set to false

Hi @al_vlad ,

 

Please try and set Items of Dropdown2 to:

Distinct(
      Filter(
          Table13, 
          Platforma = If(IsBlank(DataCardValue11.Selected),
                         "Hardcode a default value that from DataCardValue11 items",
                         DataCardValue11.Selected.Result
                      )
      ),
      'Category'
)

 

After a few tests, I found this seems a limitation for Excel online connector, and we cannot bypass it by setting the Default/DefaultSelectedItems properties of a Dropdown box or a Combo box, but need to set a hardcoded default value inside the Items property.

 

Best regards,

Community Support Team _ Jeffer Ni
If this post helps, then please consider Accept it as the solution to help the other members find it.

Community Support Team _ Jeffer Ni

If this post helps, then please consider Accept it as the solution to help the other members find it.

on this???

al_vlad_0-1634022539100.png

 

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