Hi All,
I got a problem when i try to change unit of measure (ChangeCartLineUnitOfMeasureOperationRequest) on PostProductSaleTrigger after I have call SaveAttributesOnCartLinesClientRequest to save my own attribute. You can see my picture below:
Here is my code:
But when i comment function addAttributeToCartLine i can change the unit of measure without error message pop-up on POS like this:
So, please help me. Thanks
Hi, you need also to check your async implementation - before sending Request for line #2, you should make sure request for line #1 has been finished. The same with line #3: make sure line #2 request is finished.
You are welcome :) To understand async programming - google about Javascript/typescript and Promise handling - it is not really POS feature, it is general web development feature.
Hi,
I hope you are doing great.
I'm facing same kind of issue when i'm going to update comment field of CartLine Object (SetCartLineCommentOperationRequest) in For Loop.
In my case -> CartLine of Item display on screen user select one line then Add its Number and Number
is saved on CartLine comment Field successfully .
On the other hand When select multi lines and add it Number and then through error.
it update the value for one item and do not show error But when i update multiple time it through error which is similar to @phuocdinh
Please Suggest me how can i find resolution of this issue .
I'll be very thankful to you
Regards,
Hi,
Thanks for your reply, you can refer with Oksana Kovaliova's comment as below. She gave a correct simple example about how to use async execution.
Oh, thank you a lot, i'm newbie with POS Coding, now i understood clearly how to use async execution with your pseudo code sample. If you have any document or cook book about POS Development, can you share with me?. Finally, thanks a lot for your reply. :)
Hi,
Are you sure 'change unit of measure' is always executed after 'add attribute' - and they are never running in parallel? It looks like 2 functions you are using return Promise, but 'change unit of measure' does not wait, while 'add attribute' is complete - this way cart versions can be messed and 'Cart version' error will be displayed.
You can use RefreshCartClientRequest to refresh cart after adding an attribute, but this will not fix the issue 100%, if you do not execute all Promise functions in correct sequence.
Correct async execution could look like (pseudo code sample)
return this.addAttrubute()
.then((result: bool) => {
if (result){ //only change unit of measure, if add attribute finished successfully
return this.changeUnitOfmeasure()
.then((result: bool) => {
//show error to user that UOM change failed
}
}
else {
//show error to user, that attribute was not added
}
})
Hi phuocdinh,
I hope you are doing great.
I'm facing same kind of issue when i'm going to update comment field of CartLine Object in For Loop.
In my case i have to update it on multiple time .
it update the value for one item and do not show error But when i update multiple time it through error which is similar to you.
please Suggest how you resolve the issue .
I'll be very thankful to you
Regards,
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