Flutter how to show array data in text widget by for loop

Question

I have simple list in which some string are available. I just to need to show all strings in Text widget by for loop

I try like this

List datesData = [{
  '09:00 am - 10:00 am',
  '10:00 am - 11:00 am',
  '11:00 am - 12:00 am',
  '12:00 am - 01:00 am',
  '01:00 am - 02:00 am',
  '02:00 am - 03:00 am',
  '03:00 am - 04:00 am',
  '04:00 am - 05:00 am'
}];

for(int i = 0; i < 8; i++){
     Container(
       child: Text(datesData(i)),
     );
}

ITs show error in datesData The expression doesn't evaluate to a function, so it can't be invoked.

Also in don't want to define length of for lopp like for(int i = 0; i < 8; i++) i need to check it automatically that it has 8 strings.

do you want a list of text widgets?

Akash Sarode
– Akash Sarode

2020-11-19 08:35:54 +00:00
Commented Nov 19, 2020 at 8:35 — Akash Sarode
– Akash Sarode, Commented Nov 19, 2020 at 8:35

Akif · Accepted Answer · 2020-11-19 09:00:44Z

3

You need to get the indexed data of the date array. There is an incorrect usage of parentheses. You need to use square brackets to get an index of array. It should look like this:

 for(int i = 0; i < 8; i++){
    Container(
     child: Text(datesDate[i]),
      );
    }

EDIT:

Ok, you can use this widget list inside a column. Now, it will look like this:


  List datesData = [
    
      '09:00 am - 10:00 am',
      '10:00 am - 11:00 am',
      '11:00 am - 12:00 am',
      '12:00 am - 01:00 am',
      '01:00 am - 02:00 am',
      '02:00 am - 03:00 am',
      '03:00 am - 04:00 am',
      '04:00 am - 05:00 am'
    
  ];

  List<Widget> textWidgetList = List<Widget>(); // Here we defined a list of widget!

  @override
  Widget build(BuildContext context) {
    for (int i = 0; i < 8; i++) {
      textWidgetList.add(
        Container(
          child: Text(datesData[i]),
        ),
      );
    }

    return Scaffold(
      body: Container(
        child: Column(
          children: textWidgetList,
        ),
      ),
    );
  }

edited Nov 19, 2020 at 9:00

answered Nov 19, 2020 at 8:37

Akif

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5 Comments

rameez khan Over a year ago

And how can i show it in scaffold widget ? Mean i am using for loop before returning scaffold how can i show this now in scaffold widget ?

Akash Sarode Over a year ago

you need to learn flutter basics first. You cannot randomly execute for loop anywhere. Everything in flutter is a Widget, So I suggest you read more about widgets because you'll need some kind of listing widget to contain all of your text widgets. When building the list widget you can map your array elements to text widgets and pass them as children.

Akif Over a year ago

@Akash Sarode is right. And I edited the answer with some more code.

rameez khan Over a year ago

@Akif its showing error now RangeError (index): Invalid value: Only valid value is 0: 1

Akif Over a year ago

Of course, that is my bad. Removed curly braces between the string array.

Balaji Venkatraman · Accepted Answer · 2020-11-19 09:09:26Z

You can use toList which makes easier and also use indexOf if you need index

import 'package:flutter/material.dart';

class DateDataWidget extends StatelessWidget {
  final List datesData = [
    '09:00 am - 10:00 am',
    '10:00 am - 11:00 am',
    '11:00 am - 12:00 am',
    '12:00 am - 01:00 am',
    '01:00 am - 02:00 am',
    '02:00 am - 03:00 am',
    '03:00 am - 04:00 am',
    '04:00 am - 05:00 am'
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
          child: Column(
        children: datesData.map((date) {
          int index = datesData.indexOf(date); // use index if you want.
          print(index);
          return Text(date);
        }).toList(),
      )),
    );
  }
}

You can use int index if you need.

Jewel Rana · Accepted Answer · 2021-01-06 11:21:26Z

3

make it more dynamic

 for(int i = 0; i < datesData.length; i++){
    Container(
     child: Text(datesDate[i]),
      );
    }

Update You can show with listview.builder

class MyWidget extends StatelessWidget {
  final List data = [
    '09:00 am - 10:00 am',
    '10:00 am - 11:00 am',
    '11:00 am - 12:00 am',
    '12:00 am - 01:00 am',
    '01:00 am - 02:00 am',
    '02:00 am - 03:00 am',
    '03:00 am - 04:00 am',
    '04:00 am - 05:00 am'
  ];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ListView.builder(
          itemCount: data.length,
          itemBuilder: (BuildContext ctxt, int index) {
            return new Text(data[index]);
          }),
    );
  }
}

edited Jan 6, 2021 at 11:21

answered Nov 19, 2020 at 8:49

Jewel Rana

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Comments

Akash Sarode · Accepted Answer · 2020-11-19 09:00:52Z

try this code on dartpad.dev

import 'package:flutter/material.dart';

void main() {
  runApp(App());
}

class App extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  final List data = [
    '09:00 am - 10:00 am',
    '10:00 am - 11:00 am',
    '11:00 am - 12:00 am',
    '12:00 am - 01:00 am',
    '01:00 am - 02:00 am',
    '02:00 am - 03:00 am',
    '03:00 am - 04:00 am',
    '04:00 am - 05:00 am'
  ];
  
  @override
  Widget build(BuildContext context) {
    return ListView(
      children: data.map((element) => ListTile(title: Text(element))).toList(),
    );
  }
}

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