Checkbox can remove his value on a multichoice column in sharepoint list ?

[Nosmoz]

Hi,

I have some understanding with checkboxes on Powerapps. I have on specific column a multi choice option : for example, I have some checkboxes where each of them has a specific value and different values : a, b, c and d.

This is my onCheck, OnUncheck, OnSelect and Default on one of them : 

- OnCheck

ClearCollect(
	Collection1;
		If(Checkbox1.Value;"a");
		If(Checkbox2.Value;"b");
		If(Checkbox3.Value;"c");
		If(Checkbox4.Value;"d")
)

- OnUncheck

ClearCollect(
	Collection1;Filter(
		Collection1;
		!IsBlank(Value)
	)
);;

- OnSelect

Collect(Collection1; 'Données');;

- Default

If(
	{
		'@odata.type': "#Microsoft.Azure.Connectors.SharePoint.SPListExpandedReference";
		Id: 1;
		Value: "a"
	} in Matériel_DataCard1.Default;
	true;
	false

When I check for the first time the checkbox this work fine, and I see my value inserted on my multi choice column. However, when I unchecked one checkbox (for example I have unchecked the checkbox1 and checked the checkbox2), on my multi choice the value of the first checkbox wasn't removed and the value of the second was added. 

How can I remove the value of my checkboxes when I unchecked them ?

Thanks for your help.

[v-yutliu-msft]

Hi @Nosmoz ,

Do you want to use check box to update a multiple choice column?

I've tested your formula, this will not create a collection with the data that you select.

I've made a similar test for your reference:

1)insert 4 check boxes

2)Set the check boxes's OnCheck:

ClearCollect(Collection1,
{Value:"a",data:Checkbox1.Value},
{Value:"b",data:Checkbox2.Value},
{Value:"c",data:Checkbox3.Value},
{Value:"d",data:Checkbox4.Value})

In my way, you do not need to set the OnUnCheck property.

Here's the collection1 that I create:     (I choose a,c,d as an example)

3)Set the submit button's OnSelect:

Patch(listname,Defaults(listname),{fieldname:Filter(Collection1,data=true)})

Please consider the data's format that the multiple choice column needs.

The data format should be like this:

So using filter function to filter the checkbox value equal to true will lead to this result.

Best regards,

[Nosmoz]

Hi @v-yutliu-msft thanks for your help.

I was testing each of your points, but when I write the function 

Patch(listname,Defaults(listname),{fieldname:Filter(Collection1,data=true)})

 I see an error : 'the column fieldname doesn't exist'. I tested with the column name 'Value', but i have the same error.

Regards, 

Nosmoz.