Getting other field value from selected item in dropdown

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Posted on by Joseph Markovich

Hi everyone-

I have a Canvas app that is letting a user add inventory items. When they select an item from the dropdown, I am setting a variable with the value from a field in the selected item. It never sets anything and when I save the form, it just overwrites the value (because it never returned anything!)

In the OnChange of the dropdown, this is my statement: Set(varQuantityOnHand, ItemDataCardValue.Selected.'On Hand')

I don't get any errors or squiggly lines, but it doesn't load the value of the field "On Hand" into the variable. It's just blank.

Can anyone tell me what I am doing wrong here?

Thank you.

Joe

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Michael E. Gernaey 53,928 Super User 2025 Season 2 on at

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Hi

Lets separate things.

1) setting that variable will have no impact on submitting a form. It’s always going to take the value that is selected.

2) is the form in New or Edit mode?

if it’s new then wouldn’t it be empty since you didn’t set the on hands yet?

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Nandit 1,568 Moderator on at

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Hi Joseph Markovich,

Usually this occurs when you are trying to display more than 2000 records in your DropDown control. Can you please share how many items there are and what's your items property?

You can try a couple of things here. Add the following to your OnChange property to see if it is getting triggered. -

Set(varQuantityOnHand, ItemDataCardValue.Selected.'On Hand'); Set(varTest, "Hello")

If varTest variable shows "Hello" as its value then the OnChange is working.

Second thing you can try is using ItemDataCardValue.Selected instead of ItemDataCardValue.Selected.'On Hand'. You can then use varQuantityOnHand.Value in your Patch statement.

Hope this helps.

Kind regards,

Nandit

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Joseph Markovich 17 on at

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Thank you both for your responses and assistance. I had to step away from this for a bit and looking at it again today, I realized my error.

Mike, it is a new form, but I am trying to get a value from an existing inventory item in another table. I figured out what I was doing wrong.

Nandit, thanks for reminding me to troubleshoot the update on the form field. I did that and it was setting the test variable just fine. So, after looking at all of the code in my Save button, I was somehow overwriting the number in the varQuantityOnHand variable I was setting.

Here's the OnChange code for when the user selects an item in the drop-down:

Set(varQuantityOnHand, ItemDataCardValue.Selected.'On Hand');

And all of the code once they hit Save:

If(IsBlank(ItemDataCard),

//item does not exist, create the item

Set(varItem, Patch(Items, Defaults(Items), { 'Item Number': NewItemDataCardValue.Text, 'On Hand': Value(QuantityReceivedValue.Text) } ));

//create the receipt for the new item

Set(varReceipt, Patch('Item Receipts', Defaults('Item Receipts'), { Item: varItem, Location: LocationDataCardValue.Selected, Cabinet: CabinetDataCardValue.Selected, Bin: BinDataCardValue.Selected, 'Quantity Received': Value(QuantityReceivedValue.Text), Notes: NotesDataCardValue.Text } ))

,

//create the receipt for the existing item

Set(varReceipt, Patch('Item Receipts', Defaults('Item Receipts'), {Item: ItemDataCardValue.Selected, Location: LocationDataCardValue.Selected, Cabinet: CabinetDataCardValue.Selected, Bin: BinDataCardValue.Selected, 'Quantity Received': Value(QuantityReceivedValue.Text), Notes: NotesDataCardValue.Text }));

//update the total quantity on hand for the item received (if existing)

Patch(Items, ItemDataCardValue.Selected, { 'On Hand': varQuantityOnHand + Value(QuantityReceivedValue.Text) })

);

//update the receipt to completed

Patch('Item Receipts', varReceipt, { Status: 'Status (Item Receipts)'.Inactive, 'Status Reason': 'Status Reason (Item Receipts)'.Received });

ResetForm(frmAddItem);

Navigate(InventoryList,ScreenTransition.CoverRight);

It all works now!

Sometimes you just need to walk away and then go back to it.

Thanks.

Joe

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