CODEWITHSUNDEEP
flutterdart
devil_cat2
devil_cat2

Reputation: 43

How to count number of words in a text string from user input

I'm starting to learn Dart and Flutter and have problem with one app. I'm trying to write an app that counts the number of words in a text string that a user enters. I wrote the countWords function for this, but I don't understand how to properly send a text string to this function. Can someone please explain to me how to do this and correct my code?

import 'package:flutter/material.dart';
import 'dart:convert';

class MyForm extends StatefulWidget {
  @override
State<StatefulWidget> createState() => MyFormState();
}

class MyFormState extends State {
 final _formKey = GlobalKey<FormState>();

 final myController = TextEditingController();
 int words_num = 0;
 void countWords() {
   var regExp = new RegExp(r"\w+(\'\w+)?");
   int wordscount = regExp.allMatches(myController.text); //here I have trouble
   setState(() {
     words_num = wordscount;
   });
 }

Widget build(BuildContext context) {
 return Container(
    padding: EdgeInsets.all(10.0),
    child: new Form(
        key: _formKey,
        child: new Column(
          children: <Widget>[
            new Text(
              'Text string:',
              style: TextStyle(fontSize: 20.0),
            ),
            new TextFormField(
              decoration:
                  InputDecoration(labelText: 'Enter your text string'),
              controller: myController,
            ),
            new SizedBox(height: 20.0),
            new RaisedButton(
              onPressed: () {
                countWords();
              },
              child: Text('Count words'),
              color: Colors.blue,
              textColor: Colors.white,
            ),
            new SizedBox(height: 20.0),
            new Text(
              'Number of words: $words_num',
              style: TextStyle(fontSize: 20.0),
            ),
          ],
        )));
 }
}

void main() => runApp(new MaterialApp(
  debugShowCheckedModeBanner: false,
  home: new Scaffold(
    appBar: new AppBar(title: new Text('Count words app')),
    body: new MyForm())));

Upvotes: 2

Views: 4897

Answers (1)

Christopher Moore
Christopher Moore

Reputation: 17133

Right now you're assigning an Iterable to an int. Since you want the length, use the length property of the Iterable class.

int wordscount = regExp.allMatches(myController.text).length;

This is assuming your regex is working and it appears to me that it is. If it's not then you can try this:

[\w-]+

Upvotes: 2

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