Create empty collection

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Posted on by ck25415

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Is it possible to create an empty collection?

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Building Power Apps

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hnguy71 347 on at

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You can create a collection with no data if that's what you need. For example:

ClearCollect(SampleCollection, { Field1: Blank(), Field2: Blank() });

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RezaDorrani 12,143 on at

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Hi @ck25415

ClearCollect(colEmpty,Blank())

This will create a empty collection with a column called "Value"

Regards,
Reza Dorrani

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

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seadude 1,855 on at

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Hi @ck25415 ,
For an absolutely blank Collection, you can do ClearCollect(colTestBlank, {}). The results of this one are:

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v-yutliu-msft on at

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Hi @ck25415 ,

Could you describe more clearly about the empty collection's structure?

Does the collection have fields?

Which do you extrally want

1)have fields with empty value?

2)have no field?

3)something else?

Best regards,

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ck25415 294 on at

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@RezaDorrani Thanks, that worked. I tried ClearCollect(emptyCol,"") and other suggestions from this post but the count showed 1 even though there are no items in the collection.

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NatEvansIT 62 on at

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I wasn't sure what the official resolved resolution for this question was but I managed to work out how to create the default table layout I wanted and then to make sure it was empty. Posting here in case it helps others 🙂

//Create a Collection (table) that has column headers of SwitchID, SwitchModel, SwitchValue, SwitchPort, ConnectedDevicePort
ClearCollect(COL_SwitchHierachy,
{SwitchID: "",
SwitchModel: "",
SwitchValue: "",
SwitchPort: "",
ConnectedDevicePort: ""});

//The above creates a blank row, I want an empty table so I next clear the collection but keep the column headers
Clear(COL_SwitchHierachy)

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ell10706 112 on at

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For anyone who's tried to use the above method but is dealing with integer values, I found that "Value("")" will create a blank number value in the table.

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JordanDeVan 73 on at

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If you want an empty collection with the fields from a datasource. ClearCollect(col_empty,FirstN(data_source,0))

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RJM07 801 on at

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This also works real well if you just want a totally blank collection

ClearCollect(collEmpty,{Field1:Value(""),Field2:Value("")});
Clear(collEmpty)

You can swap out 'Value("")' for Blank() if it's for text opposed to numbers

The 'ClearCollect' makes a blank collection and the immediate 'Clear' removes the annoying blank row

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caballo111 3 on at

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Thanks! How did you come with this solution?
I tried with Blank(), but then couldn't do an updateif with a number (column was expecting objNull and received a Number).
I tried with Value(Blank()), but that evaluated to 0.

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