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Description:

json table

Json Table Widget #
This Flutter package provides a Json Table Widget for directly showing table from a json(Map). Supports Column toggle also.
Live Demo: https://apgapg.github.io/json_table/
Live Data Testing: https://apgapg.github.io/json_table/#/customData
Features #

The table constructed isn't the flutter's native DataTable.
The table is manually coded hence serves a great learning purpose on how to create simple tables manually in flutter
Supports vertical & horizontal scroll
Supports custom columns includes default value, column name, value builder
Supports nested data showing
Supports pagination
Supports row select color, callback

💻 Installation #
In the dependencies: section of your pubspec.yaml, add the following line:

dependencies:
json_table: <latest version>
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❔ Usage #
Import this class #
import 'package:json_table/json_table.dart';
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- Vanilla Implementation #
//Decode your json string
final String jsonSample='[{"id":1},{"id":2}]';
var json = jsonDecode(jsonSample);

//Simply pass this json to JsonTable
child: JsonTable(json)
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- Implementation with HEADER and CELL widget builders #
JsonTable(
json,
tableHeaderBuilder: (String header) {
return Container(
padding: EdgeInsets.symmetric(horizontal: 8.0, vertical: 4.0),
decoration: BoxDecoration(border: Border.all(width: 0.5),color: Colors.grey[300]),
child: Text(
header,
textAlign: TextAlign.center,
style: Theme.of(context).textTheme.display1.copyWith(fontWeight: FontWeight.w700, fontSize: 14.0,color: Colors.black87),
),
);
},
tableCellBuilder: (value) {
return Container(
padding: EdgeInsets.symmetric(horizontal: 4.0, vertical: 2.0),
decoration: BoxDecoration(border: Border.all(width: 0.5, color: Colors.grey.withOpacity(0.5))),
child: Text(
value,
textAlign: TextAlign.center,
style: Theme.of(context).textTheme.display1.copyWith(fontSize: 14.0, color: Colors.grey[900]),
),
);
},
)
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Head over to example code: simple_table.dart
- Implementation with custom COLUMNS list #

Pass custom column list to control what columns are displayed in table
The list item must be constructed using JsonTableColumn class
JsonTableColumn provides 4 parameters, namely,

JsonTableColumn("age", label: "Eligible to Vote", valueBuilder: eligibleToVote, defaultValue:"NA")
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First parameter is the field/key to pick from the data
label: The column header label to be displayed
defaultValue: To be used when data or key is null
valueBuilder: To get the formatted value like date etc

//Decode your json string
final String jsonSample='[{"name":"Ram","email":"ram@gmail.com","age":23,"DOB":"1990-12-01"},'
'{"name":"Shyam","email":"shyam23@gmail.com","age":18,"DOB":"1995-07-01"},'
'{"name":"John","email":"john@gmail.com","age":10,"DOB":"2000-02-24"},'
'{"name":"Ram","age":12,"DOB":"2000-02-01"}]';
var json = jsonDecode(jsonSample);
//Create your column list
var columns = [
JsonTableColumn("name", label: "Name"),
JsonTableColumn("age", label: "Age"),
JsonTableColumn("DOB", label: "Date of Birth", valueBuilder: formatDOB),
JsonTableColumn("age", label: "Eligible to Vote", valueBuilder: eligibleToVote),
JsonTableColumn("email", label: "E-mail", defaultValue: "NA"),
];
//Simply pass this column list to JsonTable
child: JsonTable(json,columns: columns)

//Example of valueBuilder
String eligibleToVote(value) {
if (value >= 18) {
return "Yes";
} else
return "No";
}
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Head over to example code: custom_column_table.dart
- Implementation with nested data list #
Suppose your json object has nested data like email as shown below:
{"name":"Ram","email":{"1":"ram@gmail.com"},"age":23,"DOB":"1990-12-01"}
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Just use email.1 instead of email as key

JsonTableColumn("email.1", label: "Email", defaultValue:"NA")
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//Decode your json string
final String jsonSample='[{"name":"Ram","email":{"1":"ram@gmail.com"},"age":23,"DOB":"1990-12-01"},'
'{"name":"Shyam","email":{"1":"shyam23@gmail.com"},"age":18,"DOB":"1995-07-01"},'
'{"name":"John","email":{"1":"john@gmail.com"},"age":10,"DOB":"2000-02-24"}]';
var json = jsonDecode(jsonSample);
//Create your column list
var columns = [
JsonTableColumn("name", label: "Name"),
JsonTableColumn("age", label: "Age"),
JsonTableColumn("DOB", label: "Date of Birth", valueBuilder: formatDOB),
JsonTableColumn("age", label: "Eligible to Vote", valueBuilder: eligibleToVote),
JsonTableColumn("email.1", label: "E-mail", defaultValue: "NA"),
];
//Simply pass this column list to JsonTable
child: JsonTable(json,columns: columns)
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Head over to example code: custom_column_nested_table.dart
Column toggle #
Option for toggling column(s) also. User can customise which columns are to be shown
showColumnToggle: true
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Row Highlighting #
Add row highlighting with custom color support

allowRowHighlight: true,
rowHighlightColor: Colors.yellow[500].withOpacity(0.7),
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Row Select Callback #
Get the index and data map of a particular selected row.
Note index might return incorrect value in case of pagination
onRowSelect: (index, map) {
print(index);
print(map);
},
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Pagination #
Just provide an int value to paginationRowCount parameter

paginationRowCount: 4,
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TODO #

✅ Custom header list parameter. This will help to show only those keys as mentioned in header list
✅ Add support for keys missing in json object
✅ Add support for auto formatting of date
✅ Extracting column headers logic must be change. Not to depend on first object
✅ Nested data showing support
✅ Row highlight support
✅ Row select callback
✅ Wrap filters in expansion tile
✅ Pagination support
❌ Add option to change header row to vertical row on left

⭐ My Flutter Packages #

pie_chart Flutter Pie Chart with cool animation.
avatar_glow Flutter Avatar Glow Widget with glowing animation.
search_widget Flutter Search Widget for selecting an option from list.
animating_location_pin Flutter Animating Location Pin Widget providing Animating Location Pin Widget which can be used while fetching device location.

⭐ My Flutter Apps #

flutter_profile Showcase My Portfolio: Ayush P Gupta on Playstore.
flutter_sankalan Flutter App which allows reading/uploading short stories.

👍 Contribution #

Fork it
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -m 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create new Pull Request