Yii: How to add a simple checkbox in a view - php

Question

I want to do add a checkbox to a view using the Yii2 framework.
Using HTML, JavaScript or Angular is very easy but I don't understand how to do it with Yii2.
I have a username input in the view called _form.php:
<div class="col-md-6">
<?= $form->field($model, 'username')->textInput(['maxlength' => true]) ?>
</div>
And now I need a checkbox.
Is there any Yii documentation showing all its components?
This is my model:
<?php
namespace app\models;
use Yii;
/**
* This is the model class for table "user".
*
* #property integer $id
* #property string $username
* #property string $auth_key
* #property string $password_hash
* #property string $password_reset_token
* #property string $email
* #property integer $status
* #property integer $created_at
* #property integer $updated_at
*/
class User extends \yii\db\ActiveRecord
{
/**
* #inheritdoc
*/
public static function tableName()
{
return 'user';
}
/**
* #inheritdoc
*/
public function rules()
{
return [
[['username', 'auth_key', 'password_hash', 'email', 'created_at', 'updated_at'], 'required'],
[['status', 'created_at', 'updated_at'], 'date','format' => 'd-M-yyyy H:m'],
[['username', 'password_hash', 'password_reset_token', 'email'], 'string', 'max' => 255],
[['auth_key'], 'string', 'max' => 32],
[['email'], 'unique'],
[['password_reset_token'], 'unique'],
[['username'], 'unique'],
];
}
/**
* #inheritdoc
*/
public function attributeLabels()
{
return [
'id' => 'Idadm',
'username' => 'Nombre de usuario',
'auth_key' => 'Auth Key',
'password_hash' => 'Password Hash',
'password_reset_token' => 'Password Reset Token',
'email' => 'Email',
'status' => 'Status',
'created_at' => 'Creado',
'updated_at' => 'Actualizado',
];
}
}
So the attributes are: username, status, auth_key, email and password_reset_token. But I want to use a new attribute called population but I don't know how to do it.

Answer 1

Use ->checkBox instead of textInput
<div class="col-md-6">
<?= $form->field($model, 'username')->checkBox(['label' => 'your_label']) ?>
</div>
http://www.bsourcecode.com/yiiframework2/yii2-0-activeform-input-fields/
http://www.yiiframework.com/doc-2.0/yii-helpers-basehtml.html
http://www.yiiframework.com/doc-2.0/guide-helper-html.html