How to add multiple items at once to a “List<Map<String, dynamic>>”

[Aly F.]

Good Evening/Morning Everyone,

I’m developing an application where I’m trying to add multiple items in a form to a temporary list for user preview on screen before saving the form and adding to SQlite. 

Attached is a screenshot of the screen, I want to be able to press the “Add Item to List” button and add the user input to the list and display for their preview before they can go ahead and finally press “Add List”

Does anyone have a work around for this?  

Thank You to all in advance.

Regards,

Aly.

[Suzuki Tomohiro]

List has addAll method.

If this is not what you are looking for, would you explain the difficulty in detail?

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[Aly F.]

Hey Guys,

Thanks Suzuki for your response.

Actually that wasn’t it, but I figured out a way. 

So now I’m looking for examples on “List<Map<String, dynamic>>”

How to implement it.

Thanks all!

Regards,

Aly 

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[Suzuki Tomohiro]

Is this what you're looking for?

List<Map<String, dynamic>> list = [];

[Aly F.]

Yes it is. Thank You

But are there any examples to take a look at?

Like full code examples or code snippets.

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[Aly F.]

Sorry my email cut off

Full code examples say for implementing class and class members or integrate it into another class…

Sorry for my questions, I’m still a bit new to Flutter & Dart.

[Suzuki Tomohiro]

Luke this? (Not sure about “integrating this to another class”)

List<Map<String, dynamic>> list = [];

Map<String, dynamic> map = <String, dynamic>{“foo”, 1};

list.add(map);

[Aly F.]

I just made the 

List<Map<String, dynamic>> _tempItemList[];

Then made this addItemToList function.

Would this work?

Let me elaborate, when creating a model, how can we declare a list to be List<Map<String, dynamic>>?

[Suzuki Tomohiro]

Nice. Your challenge is getting more clear. You can declare it with:

<Map<String, dynamic>>[];

[Aly F.]

So Suzuki, 

I would have to write it like this? 

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[Suzuki Tomohiro]

Yes, that is correct.

But I recommend to define a class, such as GroceryItem, to clarify the meaning of the item.

[Aly F.]

So it would be like this correct?

And I would define class Item above in class Grocery for the "items”? 

Something like:

Final Items List<Map<String, dynamic>items?

I’m experimenting while you help me with this Suzuki

I appreciate your help

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[Suzuki Tomohiro]

Nice. I meant this:

final List<Item> items;

With Item class, you don't need to use Map<String, dynamic>, which is unclear what keys it should have. Item class is more clear for the keys and the types of the values. BTW, are you sure itemQuantity is a String?

[Aly F.]

Thank You Bro! Appreciate it

Now I’m getting the hang of it with you.

And it was a String as I was going to use a TextFormField but thinking of using a NumberPicker 

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