Class yii\web\Controller

Send data formatted as JSON.

This method is a shortcut for sending data formatted as JSON. It will return the response application component after configuring the format and setting the data that should be formatted. A common usage will be:

return $this->asJson($data);

参见：

• yii\web\Response::$format
• yii\web\Response::FORMAT_JSON
• yii\web\JsonResponseFormatter

Send data formatted as XML.

This method is a shortcut for sending data formatted as XML. It will return the response application component after configuring the format and setting the data that should be formatted. A common usage will be:

return $this->asXml($data);

参见：

• yii\web\Response::$format
• yii\web\Response::FORMAT_XML
• yii\web\XmlResponseFormatter

This method is invoked right before an action is executed.

The method will trigger the EVENT_BEFORE_ACTION event. The return value of the method will determine whether the action should continue to run.

In case the action should not run, the request should be handled inside of the beforeAction code by either providing the necessary output or redirecting the request. Otherwise the response will be empty.

If you override this method, your code should look like the following:

public function beforeAction($action)
{
    // your custom code here, if you want the code to run before action filters,
    // which are triggered on the [[EVENT_BEFORE_ACTION]] event, e.g. PageCache or AccessControl

    if (!parent::beforeAction($action)) {
        return false;
    }

    // other custom code here

    return true; // or false to not run the action
}

Binds the parameters to the action.

This method is invoked by yii\base\Action when it begins to run with the given parameters. This method will check the parameter names that the action requires and return the provided parameters according to the requirement. If there is any missing parameter, an exception will be thrown.

Redirects the browser to the last visited page.

You can use this method in an action by returning the yii\web\Response directly:

// stop executing this action and redirect to last visited page
return $this->goBack();

For this function to work you have to set the return URL in appropriate places before.

参见 yii\web\User::getReturnUrl().

Redirects the browser to the home page.

You can use this method in an action by returning the yii\web\Response directly:

// stop executing this action and redirect to home page
return $this->goHome();

Redirects the browser to the specified URL.

This method is a shortcut to yii\web\Response::redirect().

You can use it in an action by returning the yii\web\Response directly:

// stop executing this action and redirect to login page
return $this->redirect(['login']);

Refreshes the current page.

This method is a shortcut to yii\web\Response::refresh().

You can use it in an action by returning the yii\web\Response directly:

// stop executing this action and refresh the current page
return $this->refresh();

Renders a view in response 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. For this reason, you should use this method instead of renderPartial() to render a view to respond to an AJAX request.