- Yii2 Framework
-
Introduction & Setup
- Introduction to Yii2 Framework
- Installing Yii2 (Basic & Advanced Templates)
- Understanding Yii2 Directory Structure
- Yii2 Configuration Basics
- Routing & Pretty URLs in Yii2
-
Yii2 Core Concepts
- Yii2 Application Bootstrapping & Lifecycle
- Understanding Yii2 Request & Response Handling
- Working with Yii2 Components & Helpers
- Yii2 Widgets & Using Built-in Widgets
- Yii2 Helpers & Utility Classes
-
Models & Database Operations
- Yii2 Models, Active Record & Database Connections
- CRUD Operations in Yii2
- Yii2 Query Builder & DAO (Direct SQL Queries)
- Handling Relationships in Yii2 Active Record
- Yii2 Migrations & Seeding
-
Views, Layouts & Themes
- Yii2 Views & Layouts
- Yii2 Asset Bundles & Asset Management
- Integrating Bootstrap in Yii2
- Yii2 Theme Integration
- Yii2 Custom Widgets & Reusable Components
-
Forms, Validation & Data Presentation
- Yii2 Forms & Validation
- Using Yii2 GridView & ListView Widgets
- Yii2 Pagination & Sorting
- Yii2 File Uploads
-
Security & User Management
- User Authentication in Yii2
- Role-Based Access Control (RBAC) in Yii2
- Yii2 Security Features
-
Console Commands & Advanced Features
- Yii2 Console Commands
- Yii2 Events & Behaviors
- Yii2 RESTful API Development
- Consuming Third-Party APIs in Yii2
- Yii2 Background Jobs & Queue System
-
Performance Optimization & Caching
- Yii2 Caching Techniques
- Yii2 Performance Optimization
- Debugging & Logging in Yii2
-
Deployment & Best Practices
- Deploying Yii2 Applications
- Yii2 Best Practices & Large-Scale Application Structure
- Yii2 Multilingual & Localization Support
- Yii2 Module Development
- Integrating Yii2 with Frontend Frameworks (Angular/Vue/React)
-
Special Topics
- Dependency Injection (DI) in Yii2
Understanding Yii2 Request & Response Handling
Add to BookmarkIntroduction
Yii2 provides a robust request and response handling mechanism, allowing developers to process HTTP requests and generate responses efficiently. The Request
and Response
components help in managing form submissions, handling AJAX calls, retrieving request parameters, and sending JSON or file responses.
In this tutorial, we will cover:
- Yii2 Request Component
- Handling GET and POST Requests
- Managing Request Data (Headers, Cookies, Files)
- Yii2 Response Component
- Sending JSON & File Responses
- Redirects & Custom Responses
- Sending JSON Response in Standard Controller
- Handling AJAX Requests in Yii2
1. Yii2 Request Component
The Yii::$app->request
component provides methods for accessing request data.
Accessing Request Component
$request = Yii::$app->request;
2. Handling GET and POST Requests
Checking Request Type
if (Yii::$app->request->isGet) {
echo "This is a GET request";
}
if (Yii::$app->request->isPost) {
echo "This is a POST request";
}
Retrieving GET Parameters
$id = Yii::$app->request->get('id'); // Example: ?id=10
With default value:
$id = Yii::$app->request->get('id', 0); // Default value = 0
Retrieving POST Data
$name = Yii::$app->request->post('name');
3. Managing Request Data
Reading Headers
$headers = Yii::$app->request->headers;
$userAgent = $headers->get('User-Agent');
Handling Cookies
$cookie = Yii::$app->request->cookies->get('user_session');
Handling File Uploads
$file = UploadedFile::getInstanceByName('profile_picture');
$file->saveAs('uploads/' . $file->baseName . '.' . $file->extension);
4. Yii2 Response Component
The Yii::$app->response
component allows sending responses to the client.
Setting Response Content
Yii::$app->response->content = 'Hello, Dynamic Duniya!';
Setting Response Status Code
Yii::$app->response->statusCode = 404;
5. Sending JSON & File Responses
Sending JSON Response
Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
return ['message' => 'Success', 'status' => 200];
Sending File Response
return Yii::$app->response->sendFile('path/to/file.pdf');
6. Redirects & Custom Responses
Redirecting to Another Page
return Yii::$app->response->redirect(['site/index']);
Redirecting with Status Code
return Yii::$app->response->redirect(['site/index'], 301);
7. Sending JSON Response in Standard Controller
When sending a JSON response from a standard Yii2 controller (not a RESTful API controller), it's essential to explicitly set the response format.
Example: Returning JSON from a Controller Action
public function actionApi()
{
$this->message = 'API Detail';
$this->custom_response['detail'] = $this->message;
$response = Yii::$app->response;
$response->format = \yii\web\Response::FORMAT_JSON;
$response->data = $this->custom_response;
return $this->custom_response;
}
Why Set Response Format Manually?
- By default, Yii2 controllers return HTML responses.
- Setting
Yii::$app->response->format = Response::FORMAT_JSON;
ensures the correct Content-Type (application/json
) is sent. - Useful for AJAX requests or API endpoints in non-RESTful controllers.
8. Handling AJAX Requests in Yii2
Sending AJAX Request (Frontend – JavaScript Example)
$.ajax({
url: '/site/ajax-example',
type: 'POST',
data: {name: 'Rahul'},
success: function(response) {
console.log(response);
}
});
Handling AJAX in Yii2 Controller
public function actionAjaxExample()
{
if (Yii::$app->request->isAjax) {
Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
return ['message' => 'Hello from Yii2!', 'status' => 200];
}
throw new BadRequestHttpException('Invalid request');
}
Checking AJAX Request in Yii2
if (Yii::$app->request->isAjax) {
echo "This is an AJAX request";
}
Conclusion
Yii2 provides a flexible and powerful way to handle HTTP requests and responses. We explored how to retrieve GET/POST data, manage headers and cookies, send JSON responses, handle redirects, and process AJAX requests.
In the next tutorial, we will dive into Working with Yii2 Components & Helpers.
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