Yii2 - ActiveForm example

    //ActiveForm with model
    <?php $form = ActiveForm::begin() ?>
    <?= $form->field($model, 'username')->textInput() ?>
    <?= $form->field($model, 'password')->passwordInput() ?>
    <?= Html::submitButton('Login', ['class' => 'btn btn-primary', 'name' => 'login-button']) ?>
    <?php ActiveForm::end() ?>


    //ActiveForm with model and custom url
    <?php $form = ActiveForm::begin(['action' => ['site/login']]) ?>
    <?= $form->field($model, 'username')->textInput() ?>
    <?= $form->field($model, 'password')->passwordInput() ?>
    <?= Html::submitButton('Login', ['class' => 'btn btn-primary', 'name' => 'login-button']) ?>
    <?php ActiveForm::end() ?>



    //ActiveForm without model
    <?= Html::beginForm() ?>
    <b>Username</b>
    <?= Html::input('text', 'LoginForm[username]', null, ['class' => 'form-group form-control']) ?>
    <b>Password</b>
    <?= Html::input('text', 'LoginForm[password]', null, ['class' => 'form-group form-control']) ?>
    <?= Html::submitButton('Login', ['class' => 'btn btn-primary form-group']) ?>
    <?= Html::endForm() ?>


    //ActiveForm without model and custom url
    <?= Html::beginForm(['site/login'], 'post') ?>
    <b>Username</b>
    <?= Html::input('text', 'LoginForm[username]', null, ['class' => 'form-group form-control']) ?>
    <b>Password</b>
    <?= Html::input('text', 'LoginForm[password]', null, ['class' => 'form-group form-control']) ?>
    <?= Html::submitButton('Login', ['class' => 'btn btn-primary form-group']) ?>
    <?= Html::endForm() ?>