Edit gallery variable

[OiBigRed]

I have a gallery which Ive created a variable from a ThisItem

Set(varQuantity, ThisItem.Quantity)

Then I have called the variable in a textlabel

varQuantity

I am trying to edit varQuantity on + and - buttons

UpdateContext({varQuantity: varQuantity-1})
UpdateContext({varQuantity: varQuantity+1})

for some reason its not working and its setting a new variable and wont recognise the one I have set and am trying to call

Could someone help me, is UpdateContext the wrong thing to use?

Kind regards
Ryan

[shoog]

Set is used for global variables, UpdateContext for local variables.

If you use Set again, it should work as expected.

[OiBigRed]

hi @shoog ,

Thank you , Now I am getting this error

Do I need to define it as a number when its set, and then call it as a number>

If so, How do I do that?

Kind regards
Ryan

[shoog · Accepted solution]

I would expect a field called quantity to be a number already.

You can check what type it is and optionally convert to a number by using the Value function.

Also, if the field can be empty, you should add some logic to handle that situation.

[OiBigRed]

thank you thats enabled it to work, youre right my SP list quantity wasnt set to number...

Works now locally but doesnt send the data back to the SP list now

How would I do this?

Kind regards 
Ryan

[shoog]

In the update property of the datacard (or in your patch function if you use that), you will have to convert the number back to the original datatype.