These are all of my blocks:
You should also have some code to display the status of the GET from the API.
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I tried a live test on my phone, it doesnât actually tell me what the error is, the screen just turns white and it says âthere is an error with your blocksâ.
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Thanks! But Iâm actually not sure how to add the status of the GET from the API.
Say the carb value is 15⌠That is neither smaller than 12.5 nor bigger than 19. You should change 12.5 to 18.9.
EDIT: You can also have another statement to se the text of a label if the carbs value is bigger than 12.5 and smaller than 19. You can use an and block for that.
One problem youâre going to have is that youâre not setting the value of the variable âcarbsâ to the actual property âcarbohydrates_100gâ. Youâre setting a label to that value⌠but you need to store it in a variable instead. If you set the variable âcarbsâ to the value the property returns (with the âget property of objectâ block), you can then use that variable elsewhere in your code, as youâve done.
If you want to display the number of carbs, first set the variable to that value and then set GetButtonTextâs Text to âapp variable carbsâ.
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I changed the variable name, but it still gives me an error with the blocks, but it does not tell me what the error is.
Okay! So is this how I set it to the value?
Even when I tried this it shows an error with the blocks.
I guess that video covered initializing variables but not setting their values.
By the way, Iâm just Googling variables thunkable. You can do the same. There are lots of tutorial videos. Also, the Thunkable documentation is usually helpful: Variables - â Docs.
This is probably a better video for you:
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Iâm not really understanding what setting the value is, because the video didnât seem to be mentioning that, and I could not find it in the docs either.
From the documentation:
Also, at the 5:59 mark in the video, @darren shows how to set a variable value.
The point is, if you want to use a variable in your code, you need to first set itâs value. And more importantly for your project, when you get the property of a JSON object, you need to set that value to be attached to a variable using the âsetâ block.
So you need a âset app variable carbs toâ block to the immediate left of the âget property of object [carbohydrates_100g]â block.
Yes⌠but I donât understand why youâre using different variables below that. When you set the variable âCeleBytesâ (whatever that is), your next step is to check the value of the variabe âcarbohydrates_100gâ. Why? Why not just use the same variable for both? In other words, set âcarbohydrates_100gâ to âget property of objectâŚâ
Otherwise, itâs like youâre doing math this way:
set x to 35
if y < 18.9
âŚ
You want your code to work like this:
set x to 35
if x < 18.9
The âxâ and âyâ are the variable names. You need consistency.
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Oh, Iâm really sorry. When I took the first block it was set to the name âcelebytesâ and I forgot to change it âcarbohydrates_100gâ.
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These are all my blocks. Is there still an error because when I tried to scan a barcode it told me there was an eror with the blocks again.
Is there something wrong with the way I have parsed?
The way to troubleshoot your code is to use labels to display intermediate values. So each time you set a variable, you should check its value. You can use Wait blocks to pause your app and check each value. That should help pinpoint where the mistake is.
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