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DB1
Frequent Visitor

Sum function on change of a value

I have a SharePoint list with two numerical values. I customize the forms with PowerApps and I add a custom card to display the sum of the two values. When I edit a record, the form will load and sum the two values. How do I get the sum value to update when the user types in a new value in either of the two fields? 

 

I tried setting a variable in the OnChange entry for each field, and then displaying the variable as the Default entry on the total field. Typing in a new value now triggers the total to display the saved value, so not the one the person just typed in. 

Is there another on event I should be using? 

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turnerj3
Memorable Member
Memorable Member

What happens if you use the textbox value in the sum formula instead of a variable on change?

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turnerj3
Memorable Member
Memorable Member

What happens if you use the textbox value in the sum formula instead of a variable on change?

DB1
Frequent Visitor

I'm not quite sure how to do that, if I set the text to be 

"Total: " & Sum(ThisItem.'Basic Research 2022',ThisItem.'Basic Research 2023')

then it sums the two values when editing an existing record, and does not update with changes until the form is saved and re-edited. 

DB1
Frequent Visitor

If I just insert text input boxes and sum those, it works fine. The total updates with every change of either value with no configuration on my part. So getting that to work with the SharePoint list fields, or just setting the SharePoint fields to be the text input values is the goal now. 

Hi  @DB1 ,

 

Do you mean that you want this total value to show up in your sharepoint list?

 

If yes, you just need to create a new column with type: Calculated

HenWang_0-1681283667294.png

 

Since you are using power apps customized form, you can just hide this calculated column in your form and add a label to show the text you want in this customized form.

 

Best Regards,

Hen Wang

mattrogers
New Member

I'm working on a project right now where I have a SharePoint list as a data source.  In my scenario, I have a "note" that gets added each time the record is updated.  I tried using the append feature, and I actually got close using a gallery, etc.. But then I landed on this solution that I think might help you:

I have a label that displays the notes, but you can use a textbox, htmltext, etc. 

On the Edit screen for the record, I added a button that opens a modal (it's just a group of rectangles and another textbox that appears on the highest layer, with a cancel and an ok button that makes everything trigger when it's clicked). 

First, in App.OnStart, I set a variable to blank, like so:
App.OnStart = Set(varNotes, "");

 

Next, when the user selects a record, that is the only time we need them to add a note, so when the Edit screen becomes visible, I capture the value of that field and store it in the variable:
Screen_Edit.OnVisible = Set(varNotes, If(IsBlankOrError(Gallery2.Selected.StatusUpdateNotes, "", Gallery2.Selected.StatusUpdateNotes));

 

On the edit screen, I have a label that displays the variable varNotes.
lblNotes.Text = varNotes;


Now, on the edit page, with the modal open, looking at the "OK" button code, I set that variable to whatever is desired to see, and set the variable to that value:
Patch(MySPlistDataSource, LookUp(MySPlistDataSource, Title = txtUserNotesInput.Text),{StatusUpdateNotes: varNotes});
NotesOkButton.OnSelect = Set(varNotes, txtNotes.Text);
// And here I have various code elements that hide the modal group

When the last bit of code runs, it updates the label, and I don't have to refresh or do anything fancy, it just updates and the record itself also has the updated information.
You might also consider using UpdateIf() or UpdateContext(), but this works for me.

Please note that you'll need to update the Patch() function accordingly for your scenario if you choose to use it, but hopefully this gets you started.

edit: after re-reading the OP's post, I think they may benefit from using a timer, set it to half a second (500), and then on Timer.OnEnd just set the variable to sum the input boxes.  So every half a second, it'll update.  You can adjust this down to 1/10th of a second but anything under 100 won't make a difference from what I can tell.

I also used a modal in my project, thanks for sharing that part of yours. 

I ended up setting the text boxes to variables, and then the variables to the sharepoint list fields. Worked like a charm. 

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