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annasmiles1
Advocate IV
Advocate IV

Store multiple selected value of combo box in to SharePoint list - Combo box pulls from a collection

Hello,

I am using a collection in my PowerApp combo boxes to achieve some filtering. I got some help on this in a previous post.

 

But now I am running into the problem of my PowerApp being unable to write back to the SharePoint list. The fields in SharePoint are multi-select choice fields. The combo boxes are also multi select

 

The collection is set to pull choices from a separate SharePoint list.

 

So far I have been unable to get the combo box selections to save back to SharePoint at all. I have tried updating the 'Update' property on my SharePoint list field DataCard to the following:

 

ComboBox1_3.SelectedItems.Title

-Title references the Tile field in the SharePoint list we are using to generate the collection.

 

ComboBox1_3.SelectedItems

-Same as above but without Title.

 

Does anyone have any ideas on this? Thanks in advance.

9 REPLIES 9
cmyoung07
Resolver I
Resolver I

Looks like a muli select choice field stores the selections if you were editing in SharePoint as a semi colon delimited list of values.

 

You can use the concat function to achieve that in PowerApps. Try something like this:

Concat(ComboBox1_3.SelectedItems, Value,"; ")

 

Value is the default if the selection is not named so you may have to change Value to Title depending on the items in the combo box. You might just have to play around with it a bit, let me know how it goes.

annasmiles1
Advocate IV
Advocate IV

Thanks for the ideas! I tried several variations on this, and continue to get error like the following: 

Concat(ComboBox1_3.SelectedItems, Title,"; ")

The property on this control expects Table values. The rule produces Text values which are incompatible.

 

I think SharePoint might be a little picky about what it takes as a table. 

cmyoung07
Resolver I
Resolver I

Ahh, I see, take a look at this link: Patch Multi Selection Column 

 

That would lead to something like this:

 

//For Updates
Patch(
    'YourSPSource',
    LookUp('YourSPSource', ID=YourItemID),
    {
        YourSPFieldName : ComboBox1_3.SelectedItems
    }
);

//For Inserting New
Patch(
    'YourSPSource',
    Defaults('YourSPSource'),
    {
        YourSPFieldName : ComboBox1_3.SelectedItems
    }
)

 

 

poweractivate
Most Valuable Professional
Most Valuable Professional

@annasmiles1 @cmyoung07 

 

Concat returns a Text joined by the delimiter, not a Table.

The Concat function concatenates the result of a formula applied across all the records of a table, resulting in a single string. Use this function to summarize the strings of a table, just as the Sum function does for numbers.

If you want a Table, you'll need to Split the Text by the delimiter to get a Table.

To do this, you may need to Concat first and then Split it., like this:

 

Split(Concat(ComboBox1_3.SelectedItems, Title,"; "),"; ")

 

Check if it helps @annasmiles1 @cmyoung07 

poweractivate
Most Valuable Professional
Most Valuable Professional

@cmyoung07 

 

You can simplify what you provided to

 

//For Updates
Patch(
    'YourSPSource',
    {
        ID=YourItemID,
        YourSPFieldName : ComboBox1_3.SelectedItems
    }
);

//For New Records
Patch(
    'YourSPSource',
    {
        YourSPFieldName : ComboBox1_3.SelectedItems
    }
);

 

which means you can simplify it even further to:

 

//For Updates and New Records
//amIEditing should be somehing that evalues to true if should be editing an existing Record, and evaluates to false if should be creating a new Record instead.
Patch(
    'YourSPSource',
    {
        ID=If(amIEditing,YourItemID,Blank()),
        YourSPFieldName : ComboBox1_3.SelectedItems
    }
);

 

 

The reason the above works is the two-argument version of Patch works just as well as the three argument version, even directly on a data source.

 

When using the two-argument version of Patch, with the first argument being the Data Source, then the second argument should be a Record that is as follows:

 

1. If the primary key (e.g. ID) is provided in the Record and a matching Record with that Primary Key exists in the data source, then the existing record matching the primary key (e.g. the existing Record matching the provided ID) should be updated based on the other column names and values provided in the Record. So suppose YourItemID is 7, and there was a Record in the SharePoint List with ID=7. In that case, YourSPFieldName should be updated with the value of ComboBox1_3.SelectedItems for the Record with ID=7 after the Patch has succeeded - and any other columns in Record of ID=7 not specifically provided in the Record to patch, should remain with the same values that were there before the Patch.  in this example, that means for the Record of ID=7. only YourSPFieldName will be changed to ComboBox1_3.SelectedItems after the Patch has succeeded, and all other columns in the Record of ID=7 will keep the same values they already had before the Patch.
Note that only those columns with names and values provided in the Record should be updated, the others should just be untouched or left alone. So you only need to provide column names and values for those columns of the Record that you want to change, the others that are not provided should just automatically be left alone by default.

 

2. If the primary key value (e.g. ID) is not provided at all, or is Blank, or a Record with the provided primary key does not even exist in the data source, Patch will create a new record instead in this case. Suppose the ID provided was the value Blank() . If so, Patch will not modify any existing Record of the data source. In this case, Patch should create a brand new Record. In this specific example, the ID of this Record will be the one that SharePoint auto assigns on the server-side for new records, and this is managed automatically by SharePoint - however, it should be a brand new Record in this case.

 

In the example above, if the primary key (ID) matches a Record, only the YourSPFieldName column of that matching Record should be modified with the provided value in the Patch, all other columns for that Record should automatically just remain with the values that were already there before. If the primary key does not match any existing Record, then a brand new Record is created, with the YourSPFieldName of this Record set to ComboBox1_3.SelectedItems in this brand new Record.

 

See if this helps @cmyoung07 @annasmiles1 

 

cmyoung07
Resolver I
Resolver I

Thanks, was unaware of this simplified syntax, I like it!

annasmiles1
Advocate IV
Advocate IV

Thank you both so much for these responses! I have to admin I am still feeling a little clueless.

 

Where should I be putting these Patch function formulas? I am trying the Update property of the datacard, and although I get no errors, no results are saving for the field I am trying to patch. Same results if I use the Patch function on the OnSelect property save button for the form. It seems like OnSelect is where this should go but I am not having much luck.

annasmiles1
Advocate IV
Advocate IV

Ok another update and another thank you. I think I am meant to use Patch in the OnSelect property of the button.

 

However, I think another thing to account for is that this is multiple choice, and SharePoint may want the selections in a table format. I found this video about patching choice fields: PowerApps: Patch SharePoint Lookup, Person and Choice Fields - YouTube.

 

I think I may need to do some kind of collection.

 

This seems really complicated and hard to maintain to be honest. So I'm open to better ideas.

Hello!

I tried this for my PowerApp but when i want to edit the form, the choices then delete so each time people have to readd them. how can i fix this? thank you for your help! 🙂

 

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