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Adding a + and - button to a gallery per item

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Posted on by EitanKGCS

Hi all,

I am trying to create a shopping cart for my office merchandise. I would like to add a plus and minus button to the gallery of items that are pulled from a SharePoint list.

Once someone has selected the quantity, I would like it to be saved to a collection that is the basket which they can then make an order for the total items selected. I have managed to create a collection for the basket but the last part I am stuck on is getting plus and minus buttons to work. I don't want to connect it to a SharePoint list until the order has been confirmed and sent to processing so would prefer if this was a collection but UpdateContext doesn't work and can't seem to work out the exact formula for a collection.

Does anyone have any suggestions?

Thanks,

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Building Power Apps

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RandyHayes 76,299 Super User 2024 Season 1 on at

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@EitanKGCS

For your Plus/Increase icon OnSelect:

Update(yourCollection, ThisItem, {Qty: ThisItem.Qty + 1})

For your Minus/Decrease icon OnSelect:

Update(yourCollection, ThisItem, {Qty: ThisItem.Qty - 1})

I hope this is helpful for you.

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TheRobRush 11,128 Moderator on at

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Haha I was too slow

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EitanKGCS 46 on at

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Thanks for the quick response.

Update(colShoppingCart,ThisItem,{QTY:ThisItem.QTY+1})

I have added this to my plus icon and the error showing up is "Name isn't valid. this Identifier isn't recognized."

I haven't added a coded default figure into the text input, it is just a 0 at the moment. What should I put in the default section there as well?

Do you know what could be causing this?

Thanks,

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RandyHayes 76,299 Super User 2024 Season 1 on at

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@EitanKGCS

What part of the formula is showing as not recognized? Click into the formula and hover over the red underlines. Look for a thicker/darker red underline to pinpoint the area of the formula that it is complaining about.

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EitanKGCS 46 on at

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@RandyHayes

"ThisItem" is invalid.

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RandyHayes 76,299 Super User 2024 Season 1 on at

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@EitanKGCS

Then the formula is not in your Gallery!! Where are you putting this formula?

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EitanKGCS 46 on at

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I am putting it in the Plus button. Should I be putting it in the items section of the gallery? Because the items are being pulled from a SP list so I wanted to keep them separate.

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RandyHayes 76,299 Super User 2024 Season 1 on at

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@EitanKGCS

No, this should be on the OnSelect action of your control that is IN the gallery template. Not outside of it.

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EitanKGCS 46 on at

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Yes, that is what I have done. The button is definitely in my gallery and has been copied to every item in the gallery as well. For some reason, it just doesn't seem to like ThisItem.

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RandyHayes 76,299 Super User 2024 Season 1 on at

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@EitanKGCS

Can you provide a screenshot of your gallery with the left control tree expanded?

I am not sure what you mean by "copied to every item in the gallery".

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