yii2 Ajax Request Render Ajax view

Example

Controller::renderAjax() method can be used to respond to an Ajax request. This method is similar to renderPartial() except that it will inject into the rendering result with JS/CSS scripts and files which are registered with the view

Assume we have login form in a view file:

<?php
use yii\helpers\Html;
use yii\bootstrap\ActiveForm;

\yii\bootstrap\BootstrapAsset::register($this);

<div class="site-login">

    <?php $form = ActiveForm::begin(); ?>

        <?= $form->field($model, 'username')->textInput() ?>

        <?= $form->field($model, 'password')->passwordInput() ?>

        <?= Html::submitButton('Login',['class' => 'btn btn-primary btn-block']) ?>

    <?php ActiveForm::end(); ?>
</div>

When we use renderPartial() in a controller action:

public function actionLogin()
{
    $model = new LoginForm();
    if ($model->load(Yii::$app->request->post()) && $model->login()) {
        return $this->goBack();
    }
    return $this->renderPartial('login', [
        'model' => $model,
    ]);
}

Action output:

<div class="site-login">
    <form id="w0" action="/site/login" method="post" role="form">
        <div class="form-group field-loginform-username required">
            <label class="control-label" for="loginform-username">Имя пользователя</label>
            <input type="text" id="loginform-username" class="form-control" name="LoginForm[username]">
        </div>
        <div class="form-group field-loginform-password required">
            <label class="control-label" for="loginform-password">Пароль</label>
            <input type="password" id="loginform-password" class="form-control" name="LoginForm[password]">
        </div>
        <button type="submit" class="btn btn-primary btn-block">Login</button>
    </form>
</div>

When we use renderAjax() in a controller action:

    ...
    return $this->renderAjax('login', [
        'model' => $model,
    ]);
    ...

Action output (JS,CSS injected):

<link href="/assets/f1759119/css/bootstrap.css" rel="stylesheet">
<div class="site-login">
    <form id="w0" action="/site/login" method="post" role="form">
        <div class="form-group field-loginform-username required">
            <label class="control-label" for="loginform-username">Имя пользователя</label>
            <input type="text" id="loginform-username" class="form-control" name="LoginForm[username]">
        </div>
        <div class="form-group field-loginform-password required">
            <label class="control-label" for="loginform-password">Пароль</label>
            <input type="password" id="loginform-password" class="form-control" name="LoginForm[password]">
        </div>
        <button type="submit" class="btn btn-primary btn-block">Login</button>
    </form>
</div>
<script src="/assets/13aa7b5d/jquery.js"></script>
<script src="/assets/302a2946/yii.js"></script>
<script src="/assets/302a2946/yii.validation.js"></script>
<script src="/assets/302a2946/yii.activeForm.js"></script>

If we want to exclude some assets from view (to prevent dublicates):

...
Yii::$app->assetManager->bundles = [
    'yii\bootstrap\BootstrapAsset' => false,
];
return $this->renderAjax('login', [
    'model' => $model,
]);
...

Action output (no bootstrap.css):

<div class="site-login">
    <form id="w0" action="/site/login" method="post" role="form">
        <div class="form-group field-loginform-username required">
            <label class="control-label" for="loginform-username">Имя пользователя</label>
            <input type="text" id="loginform-username" class="form-control" name="LoginForm[username]">
        </div>
        <div class="form-group field-loginform-password required">
            <label class="control-label" for="loginform-password">Пароль</label>
            <input type="password" id="loginform-password" class="form-control" name="LoginForm[password]">
        </div>
        <button type="submit" class="btn btn-primary btn-block">Login</button>
    </form>
</div>
<script src="/assets/13aa7b5d/jquery.js"></script>
<script src="/assets/302a2946/yii.js"></script>
<script src="/assets/302a2946/yii.validation.js"></script>
<script src="/assets/302a2946/yii.activeForm.js"></script>