All language subtitles for 47. Adding Transactions with a Date

Let's now also use the selected date and we already have the submit data method which is triggered

when we try to add the transaction. There right now, we're validating that we have a title and an amount

and if either of the two is missing, we return which means we don't submit the data.

Now I want to add a third condition which when it is false will also lead to this not being submitted

and that is of course that selected date is equal to null,

so it's not set.

If that is not set, then I also want to quit.

So if either of these three conditions is met, if we have no title, if the amount is below zero or equal

to zero or if we have no selected date, then we will return

and as an addition to avoid errors, if you don't even have an amount entered, so if you hit add transaction

here with nothing entered where you get an error right now, you can also add an initial check here and

check if _amountController.text is empty,

in that case this here would always fail,

then you can also return.

Now you can still fail if you enter some text that is not passable into the amount controller but that's

a case we can ignore for now, at least we now avoid errors because we try to submit an empty form

but back to submitting our date. In the end, the goal has to be that we pass our selected date here, the

datetime object to addTx, so to our add transaction function. The add transaction function in the end is of

course defined in main.dart, there we have add new transaction and at the moment, we're not expecting

a date here.

Of course we can change this,

we can accept a third argument which is of type datetime which is the chosen date and the chosen

date should now be used here instead of datetime

now as a date for the transaction and that should already be all we need to do.

This should allow us to pick a date and use it in the create a transaction.

So if I now add a title here, new shoes and a value of let's say 69.99, then at

the moment I also can't get to my date picker without closing the keyboard,

so we'll have to take care about this soon.

For now let's close the keyboard and now choose a date and

let's say yesterday. If I now add the transaction, that's looking good, it was added to yesterday not today

and now let's try another transaction, groceries for 15.86

let's say. Close that, choose a date and let's say that was on Sunday, and indeed that's added here

on Sunday and you see it only makes up a fraction of our total spendings.

Now the fact that we can't really get to our date picker here without manually closing the keyboard

is something we should also take care of

of course. For the moment, it's however something we can live with

and later, we'll learn about a technique or about a certain feature of Flutter that helps us with fixing

this problem here as well.