I try to add dynamic table row list value but it display this error when I click Add Box to add table list.
Another exception was thrown: type 'List<Map<String, Object>>' is not a subtype of type 'Map<List<dynamic>, dynamic>' in type cast.
Container(
// add button
margin: EdgeInsets.only(top: 10),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(2.0),
color: Colors.grey[200],
border: Border.all(color: Colors.grey[500], width: 1.5)),
height: data.size.width * 0.039,
child: FlatButton(
onPressed: () {
setState(() {
Map<List, dynamic> rowValue = Map<List, dynamic>();
rowValue = [
{
'serialNo': '',
"table": [
[
{'first_a': ''},
{'Second_a': ''},
{'Third_a': ''},
{'Fourth_a': ''},
{'Fifth_a': ''},
{'Sixth_a': ''},
{'Seventh_a': ''},
{'Eighth_a': ''}
],
[
{'first_b': ''},
{'Second_b': ''},
{'Third_b': ''},
{'Fourth_b': ''},
{'Fifth_b': ''},
{'Sixth_b': ''},
{'Seventh_b': ''},
{'Eighth_b': ''}
],
[
{'first_c': ''},
{'Second_c': ''},
{'Third_c': ''},
{'Fourth_c': ''},
{'Fifth_c': ''},
{'Sixth_c': ''},
{'Seventh_c': ''},
{'Eighth_c': ''}
],
[
{'first_d': ''},
{'Second_d': ''},
{'Third_d': ''},
{'Fourth_d': ''},
{'Fifth_d': ''},
{'Sixth_d': ''},
{'Seventh_d': ''},
{'Eighth_d': ''}
],
]
}
] as Map<List, dynamic>;
print("get value new");
print(rowValue);
this.rowList.add(rowValue);
// updateDetails();
});
},
child: Text('+ Add Box',
style: TextStyle(
color: Colors.grey[900],
fontWeight: FontWeight.bold,
fontSize: data.size.width * 0.019))),
),
]));
this is my full code in dartPad
every table cell user can insert data. And this question continue from this make model of array object in flutter
2
Answers
Your data and the type of this parameter doesn’t match. From your code examplt, I will focus the value of the
rowValueand I assume you set the wrong type. Try to change the type of the rowValue likeList<Map<String,dynamic>> rowValue.Declared type and assigned data type are different. Declared type is
Map<List, dynamic>and the date being assigned isList<Map<String, Object>>Since there’s only one map in
rowValuedata list, we may remove the list type as well as the cast, cause we don’t need to cast the type.This should work.