firma | PSBT offline signer , available on Android and CLI | Ecommerce library

You have defined a List data; in your _JsonPageState class but you are not assigning a value to it anywhere.

But in the build method you are trying to access data.length; which will throw the mentioned error since, data is still null.

Seeing that you have no use of that line, just remove data.length. This will solve your posted issue.

Secondly, as @DarShan mentioned, you will face another issue once your current issue is resolved.

Which is, a FutureBuilder takes time to load your data from your future. So you can't directly access snapshot.data.toString() since snapshot.data could be null.

So, inside your builder add an extra check like this,

Overall there are quite a few issues with your code, which can be summarised as problems with

• invalid HTML (e.g. duplicate IDs, incorrectly written input element, un-closed table rows, un-closed data attributes)
• over-complicated HTML
• typing or case errors (e.g. W instead of w)
• incorrect CSS selectors in the JavaScript
• lack of initial default data (e.g. if there are no numbers in any one of the input boxes, the calculation will fail because trying to add a blank value to another number results in NaN (Not a Number)
• calculation did not run when page loads, so data is missing until the user changes something (which is no use, if they want to see the current weight before changing any values)

This client-side demo demonstrates the HTML you need to get your PHP to produce, and the correct JavaScript / jQuery code in order to do the calculations and display the results:

The most efficient way to dealing with json data and rendering them is by creating models. If you are new to this QuickType can help you out with this.

Paste your json and you will get the code for the model. Next u can instantiate the model with your json data and use ListView.builder to iterate through your model and render the data.

Retroportal studio has a good video explaining this concept, take a look. I'm sure it will help you out.

you cannot do paginate in array so convert this Raw query in Query Builder like this

You have to handle the events in the application loop. See pygame.event.get() respectively pygame.event.pump():

For each frame of your game, you will need to make some sort of call to the event queue. This ensures your program can internally interact with the rest of the operating system.

To get the behaviour you want here, you will need to use slots. The entities are only featurised in a [1,0] way - whether the entity is present or not. If you define a categorical slot, with all the different expected values, then your bot should predict the actions correctly.

Alternatively, if you want to use a custom action for this conversation flow anyways, you might consider just having one story, like:

The code may be an attempt to calculate the offset of an element of an array member of a structure. It does not quite make sense in the limited context shown in the question, but if we assume the structure may have other members and the array element of interest is not always zero but some member i, then it makes more sense. However, the expression shown in the question is flawed.

The C standard provides a way to calculate the offset of a structure member, the offsetof macro, declared in . However, this is is for a structure member, not an element of an array of a member of a structure. But we can use arithmetic to calculate the desired offset.

The offset of element i in the array info of a structure of type TCBInfoTab is:

if we want to subset the 'id' where at least one of the column from 'rop' to 'pcld' have 1 in its column for all rows, then do a group by 'id' and filter by creating a logical vector with rowSums, and wrap with all

I think this is what you are trying to achieve!