Question 108566 in Flutter Question posted in
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Flutter – How can I create a nested map in dart

I’m trying to create a nested map in dart :

static Map<String, Map<String, dynamic>> items = new Map<String, Map<String, dynamic>>();

and add values to this map when pressing a button :

Mainclass.items.addAll({
    "keyname" : {
        "firestvalue": 100, // cghange every press
        "secondvalue": 100 // cghange every press
    }
});

This is not working, it everytime shows length 1 :

print("length" + account.items.length.toString());

Any suggestions ?

Tags:

2

Answers


  1. 0

    here is an implementation how you can do
    you can make function addValuesToMap()

    Map<String, Map<String, dynamic>> items = {};

  void addValuesToMap() {
    String keyName = 'keyname';
    int firstValue = 100;
    int secondValue = 100;

    setState(() {
      items[keyName] = {
        'firstvalue': firstValue,
        'secondvalue': secondValue,
      };
    });
  }

    then this function you can call in elevated button

    ElevatedButton(
      onPressed: () {
        addValuesToMap();
      },
      child: Text('Add Values'),
    )
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  2. 0

    I am not sure what you expect to happen. However, if you want to dump values into a map of map, you want to maintain a key/index for each inner map you add.

    Map<String, Map<String, dynamic>> items = {};

  void addValuesToMap() {
    String keyName = 'keyname';
    int firstValue = 100;
    int secondValue = 100;

    setState(() {
      items["${items.length}"] = {
        keyname: {
            "firestvalue": firstValue, // change every press
            "secondvalue": secondValue // change every press
         }
       };
    });
  }

    You can call the addValuesToMap() function from the onpressed of a button.

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