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Home > Web Development > Server Side Web Development > Yii2 By Example
Yii2 By Example
Yii2 By Example

Yii2 By Example: Develop complete web applications from scratch through practical examples and tips for beginners and more advanced users

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Yii2 By Example

Chapter 2. Creating a Simple News Reader

This chapter explains how to write your first controller in order to display news items list and details, make interactions between controllers and views, and then customize the view's layout.

In this chapter, we will go through the following:

  • Creating controller and action
  • Creating a view to display the news list
  • How the controller sends the data to view
    • Example – create a controller to display the static news items list and details
  • Split the common view content into reusable views
    • Example – render partial in view
  • Creating static pages
  • Share data between views and layout
    • Example – change layout background based on the URL parameter
  • Layout with dynamic blocks
    • Example – add dynamic box to display advertising info
  • Using multiple layouts
    • Example – using different layout to create responsive and not responsive layout for the same view

Creating Controller and Action

In order to handle a request, the first thing to do is to create a new controller.

The things you must remember while creating a file controller are as follows:

  • The namespace at the top (in basic application usually app\controllers)
  • The use path for used class
  • The controller class must extend the yii\web\Controller class
  • The actions are handled from controller functions whose name starts with action and the first letter of each word is in uppercase

Let's point to basic/controllers and create a file named NewsController.php.

Then, create a class with the same name as the file and extend it from controller; finally, create an action named index to manage request for news/index:

<?php

// 1. specify namespace at the top (in basic application usually app\controllers);
namespace app\controllers;

// 2. specify 'use' path for used class;
use Yii;
use yii\web\Controller;

// 3. controller class must extend yii\web\Controller class;
// This line is equivalent...

Creating a view to display a news list

Now, we will create a simple news list in a view named itemsList. We will point to this view from NewsController, so we have to:

  • Create a news folder under basic/views, that NewsController will use as the base folder to search for the views to be rendered (according to the view names' rules explained in the previous chapter)
  • Create an itemsList.php file under basic/views/news

Now, open basic/views/news/itemsList.php, create an array with a list of data and display the output with a simple table of items:

<?php
    $newsList = [
        [ 'title' => 'First World War', 'date' => '1914-07-28' ],
        [ 'title' => 'Second World War', 'date' => '1939-09-01' ],
        [ 'title' => 'First man on the moon', 'date' => '1969-07-20' ]
    ];
?>

<table>
    <tr>
        <th>Title</th>
   ...

How the controller sends data to view

In the previous paragraph, we have seen how to display the content view. However, the view should only be responsible for displaying data, and not for manipulation. Consequently, any work on data should be done in controller action and then passed to view.

The render() method in the action of the controller has a second parameter, which is an array whose keys are names of variables, and values are the content of these variables available in view context.

Now, let's move all data manipulation of our itemsList example in controller, leaving out just the code to format the output (such as HTML).

The following is the content of the actionItemsList() controller:

public function actionItemsList()
{
  $newsList = [
    [ 'title' => 'First World War', 'date' => '1914-07-28' ],
    [ 'title' => 'Second World War', 'date' => '1939-09-01' ],
    [ 'title' =&gt...

Splitting the common view content into reusable views

Sometimes, views share the same common portion of content. In the examples made until now, we have seen that a common area for itemsList and itemDetail could be copyright data, which displays a disclaimer about copyright info.

In order to make this, we must put the common content in a separate view and call it using the renderPartial() method of controller (http://www.yiiframework.com/doc-2.0/yii-base-controller.html#renderPartial%28%29-detail). It has the same types of parameters of the render() method; the main difference between the render() and renderPartial() methods is that render() writes a view content in layout and renderPartial() writes only view contents to output.

Example – render partial in view

In this example, we create a common view for both itemsList and itemDetail about copyright data.

Create a view file named _copyright.php in views/news.

Note

Usually, in Yii2's app, a view name that starts with underscore stands...

Creating static pages

All websites contain static pages, whose content is static.

To create a static page in a common way, we need to:

  • Create a function (action) to execute action in Controller
  • Create a view for static content

Append the following action to Controller:

public function actionInfo()
{
    return $this->render('info');
}

Then, create a view in views/controller/action-name.php. This procedure is simple but too long and redundant.

Yii2 provides a quick alternative, adding static pages to the actions() method of Controller as follows:

public function actions()
{
  return [
    'pages' => [
    'class' => 'yii\web\ViewAction',
    ],
  ];
}

With this simple declaration, we can put all static content under views/controllerName/pages.

Finally, we can point to the URL with route controller_name/page and the view parameter with the name of a view file such as http://hostname/basic/web/index.php?r=controllerName/pages&view=name_of_view.

Example...

Creating Controller and Action

In order to handle a request, the first thing to do is to create a new controller.

The things you must remember while creating a file controller are as follows:

  • The namespace at the top (in basic application usually app\controllers)

  • The use path for used class

  • The controller class must extend the yii\web\Controller class

  • The actions are handled from controller functions whose name starts with action and the first letter of each word is in uppercase

Let's point to basic/controllers and create a file named NewsController.php.

Then, create a class with the same name as the file and extend it from controller; finally, create an action named index to manage request for news/index:

<?php

// 1. specify namespace at the top (in basic application usually app\controllers);
namespace app\controllers;

// 2. specify 'use' path for used class;
use Yii;
use yii\web\Controller;

// 3. controller class must extend yii\web\Controller class;
// This line is equivalent to
// class...

Creating a view to display a news list

Now, we will create a simple news list in a view named itemsList. We will point to this view from NewsController, so we have to:

  • Create a news folder under basic/views, that NewsController will use as the base folder to search for the views to be rendered (according to the view names' rules explained in the previous chapter)

  • Create an itemsList.php file under basic/views/news

Now, open basic/views/news/itemsList.php, create an array with a list of data and display the output with a simple table of items:

<?php
    $newsList = [
        [ 'title' => 'First World War', 'date' => '1914-07-28' ],
        [ 'title' => 'Second World War', 'date' => '1939-09-01' ],
        [ 'title' => 'First man on the moon', 'date' => '1969-07-20' ]
    ];
?>

<table>
    <tr>
        <th>Title</th>
        <th>Date</th>
    </tr>
    <?php foreach($newsList as $item) { ?>
    <tr>
        <td...

How the controller sends data to view

In the previous paragraph, we have seen how to display the content view. However, the view should only be responsible for displaying data, and not for manipulation. Consequently, any work on data should be done in controller action and then passed to view.

The render() method in the action of the controller has a second parameter, which is an array whose keys are names of variables, and values are the content of these variables available in view context.

Now, let's move all data manipulation of our itemsList example in controller, leaving out just the code to format the output (such as HTML).

The following is the content of the actionItemsList() controller:

public function actionItemsList()
{
  $newsList = [
    [ 'title' => 'First World War', 'date' => '1914-07-28' ],
    [ 'title' => 'Second World War', 'date' => '1939-09-01' ],
    [ 'title' => 'First man on the moon', 'date' => '1969-07-20' ]
  ];

  return $this->render('itemsList...

Splitting the common view content into reusable views

Sometimes, views share the same common portion of content. In the examples made until now, we have seen that a common area for itemsList and itemDetail could be copyright data, which displays a disclaimer about copyright info.

In order to make this, we must put the common content in a separate view and call it using the renderPartial() method of controller (http://www.yiiframework.com/doc-2.0/yii-base-controller.html#renderPartial%28%29-detail). It has the same types of parameters of the render() method; the main difference between the render() and renderPartial() methods is that render() writes a view content in layout and renderPartial() writes only view contents to output.

Example – render partial in view

In this example, we create a common view for both itemsList and itemDetail about copyright data.

Create a view file named _copyright.php in views/news.

Note

Usually, in Yii2's app, a view name that starts with underscore stands for common...

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Page 1 of 10

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Key benefits

  • Improve your programming experience and become a full stack developer
  • Master real-life web applications, and create and manage four different projects
  • Step-by-step guidance to develop real-world web applications smoothly

Description

Yii is a high-performance PHP framework best for developing Web 2.0 applications. It provides fast, secure, and professional features to create robust projects, however, this rapid development requires the ability to organize common tasks together to build a complete application. It's all too easy to get confused; this is where this book comes in. This book contains a series of practical project examples for developers starting from scratch. Each section contains the most relevant theories for every topic as you walk through developing each project, focusing on key aspects that commonly confuse users. The book starts with all the framework’s basic concepts, such as controllers and views, to introduce you to Yii and creating your first application, a simple news reader. You will be learn to configure URL rules to make a pretty URL, essential for search engine optimization. Next, you will walk through Model and ActiveRecord, key concepts in database interaction. The second application you will develop is a reservation system that allows you to manage rooms, customers, and reservations. For this, you will use database connection through SQL and ActiveRecord. More complex than the first one, this application will introduce you to the advanced template of Yii 2, splitting the app into two parts: a frontend for all visitors and a backend for the admin. Finally, you will move on to the last two applications: one that allows connections from remote clients, through RESTful components of Yii 2, and another that creates and organizes automatic tasks using the console application structure of Yii 2.

Who is this book for?

This book is for anyone who wants to discover and explore Yii Framework. Basic programming experience with PHP and object oriented programming is assumed.

What you will learn

  • Understand basic concepts, along with the installation and customization of Yii
  • Discover models, controllers, and views—concepts applied in a web context—and how they are employed in Yii
  • Use ActiveRecord to manipulate a database
  • Add access control to your web application through authentication and authorization
  • Install and customize an advanced template for multiple applications in the same project
  • Create a RESTful Web Service to allow remote access to data
  • Develop a console application to launch a command in the console as an automated task (cron job)
  • Make code reusable through widgets and components and localize text messages to make a multilanguage web app

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Sep 29, 2015
Length: 344 pages
Edition : 1st
Language : English
ISBN-13 : 9781785287411
Category :
Web Development
Concepts :
Server Side Web Development
Tools :
Yii

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Product Details

Publication date : Sep 29, 2015
Length: 344 pages
Edition : 1st
Language : English
ISBN-13 : 9781785287411
Category :
Web Development
Concepts :
Server Side Web Development
Tools :
Yii

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Table of Contents

14 Chapters
1. Starting with Yii2 Chevron down icon Chevron up icon
1. Starting with Yii2
Requirements and tools
Installing Yii2 with Composer
Application structure
Application properties
Naming convention
Summary
2. Creating a Simple News Reader Chevron down icon Chevron up icon
2. Creating a Simple News Reader
Creating Controller and Action
Creating a view to display a news list
How the controller sends data to view
Splitting the common view content into reusable views
Creating static pages
Sharing data between views and layout
Layout with dynamic block
Using multiple layouts
Summary
3. Making Pretty URLs Chevron down icon Chevron up icon
3. Making Pretty URLs
Using pretty URLs
Custom URL rules
Default parameters in rules
The complete URL rule parameters
The URL pattern to support the multilanguage view
Creating the rule class
Summary
4. Creating a Room through Forms Chevron down icon Chevron up icon
4. Creating a Room through Forms
Creating a Model
Using ActiveForm
Format date, time, and numbers
Uploading files
Summary
5. Developing a Reservation System Chevron down icon Chevron up icon
5. Developing a Reservation System
Configuring a DB connection
Using Gii to create room, customer, and reservation models
Using ActiveRecord to manipulate data
Working with relationships
How to save a model from a form
Setting up the GMT time zone
Using multiple database connections
Summary
6. Using a Grid for Data and Relations Chevron down icon Chevron up icon
6. Using a Grid for Data and Relations
Introduction
DataProvider for grids
Using a grid
Custom columns in a grid
Filters in GridView
Displaying and filtering ActiveRecord relational data in a grid's column
A summarized footer row in a grid
Multiple grids on one page
Summary
7. Working on the User Interface Chevron down icon Chevron up icon
7. Working on the User Interface
Using Gii to generate CRUD
Customize JavaScript and CSS
Using AJAX
Using the Bootstrap widget
Multiple models in the same view
Saving linked models in the same view
Summary
8. Log in to the App Chevron down icon Chevron up icon
8. Log in to the App
Creating a user login
Configuring user authorization
Mixing ACF and RBAC
Summary
9. Frontend to Display Rooms to Everyone Chevron down icon Chevron up icon
9. Frontend to Display Rooms to Everyone
Using an advanced template to split frontend and backend
Configuring an application using init
Sharing ActiveRecord models among applications
Customizing a URL in the advanced template
How to use the advanced template in the shared hosting
Summary
10. Localize the App Chevron down icon Chevron up icon
10. Localize the App
Setting the default language
File-based translations
Placeholders formatting
DB-based translations
Summary
11. Creating an API for Use in a Mobile App Chevron down icon Chevron up icon
11. Creating an API for Use in a Mobile App
Configuring a REST app in the advanced template
Creating a controller
Authentication
New controller action
Customizing authentication and response
Other forms of export – RSS
Summary
12. Create a Console Application to Automate the Periodic Task Chevron down icon Chevron up icon
12. Create a Console Application to Automate the Periodic Task
Interacting with console applications
Creating a console controller
Formatting the output from the console
Implementing and executing cron jobs
Summary
13. Final Refactoring Chevron down icon Chevron up icon
13. Final Refactoring
Creating widgets
Creating components
Creating modules
Generating an API documentation
Summary
Index Chevron down icon Chevron up icon
Index

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Davidc316 Apr 17, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is a great book for anyone who wants to learn about how to use the Yii2 framework. From the get-go, it starts by dealing with many of the questions that you might have been afraid to ask on the Yii forum. Questions like;* How do layouts work?* How can you switch between different types of page template?* How do you deal with re-usable snippets of HTML code?I think, when you're teaching Yii2 there's a temptation to go straight into the Gii and to show people how to quickly generate code with a few clicks. It's a great trick and it is bound to impress a few people. However, I think that kind of strategy is a flaw and thankfully the author doesn't fall down that trap. Instead, he takes the reader through all of the basics first, then - once you have a solid foundation - he'll move you onto the Gii. This is surely the best way of learning Yii2.All of the examples that the author walks you through are practical and clearly explained. Of course, later on it also goes beyond just ordinary webpage construction and goes into more advanced material like creating console applications and how to build restful APIs. Like any book, I'm sure it's not perfect. However, I think it is as good as any person could reasonably expect from a book on this kind of subject matter.It's a definite thumbs up from me.
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Mr Clean Apr 18, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
All is well and good.
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Kindle Customer Jul 21, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Excellent book, I can't recommend it enough for anyone wanting to learn this framework!
Amazon Verified review Amazon
Tristan Bendixen Oct 30, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I was one of the technical reviewers on this book, and have thus read the book thoroughly from start to end.The book requires a working knowledge of PHP and associated technologies, but as long as you have that, you are bound to find the book useful. Whether you're just starting out with Yii2 or you've been playing around with it a bit, Yii2 By Example contains a lot of useful information.While a user with some experience in Yii2 development may not benefit a lot from the first few sections, in which everything is set up and explained, the book quickly becomes useful as it dives deeper, while still explaining things in an easy-to-understand manner.Of particular interest to those who are interested in developing more advanced Yii2 applications are the chapters that pertains to the advanced application template, such as the separation of frontend and backend with a common layer for models and configs, the development of a REST API, and of course creation of console commands that can be used in cronjobs or for maintenance tasks.One of the things I love about the 'By Example' series of books from Packt Publishing, is the way a lot of subjects are covered from multiple angles when possible. A good example of this, in Yii2 By Example, would be the access control sections, where multiple methods are shown and explained.
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Alvaro Oct 20, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Nice and needed approach to move from Yii to Yii2 and also to start from scratch with this awesome framework.It covers everything I need to trace the correct path on building strong web apps (including the creation of an api to be connected from foreign services or mobile apps) and gives hints on searching for further functionalities.
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C# 12 and .NET 8 – Modern Cross-Platform Development Fundamentals
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Building Python Microservices with FastAPI
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About the author

Profile icon Caldarelli
Caldarelli
Fabrizio Caldarelli is an Italian programmer who started his professional career in his youth by programming with desktop-oriented languages, the first being Visual Basic. From the year 2000 onward, he spent 5 years developing software to manage radio broadcasts. During that period, he studied C#.NET to make porting of all software versus this new platform. During the same period, he learned web programming, HTML, and ASP, and in 2003, he began to develop software using PHP as the default programming language for web pages. During those years, he collaborated as a teacher for PHP programming courses with http://www.html.it/, an important online reference for developers in Italy. In 2008, he added new skills to his experience by starting to develop mobile projects for Nokia devices with Symbian C++, and a few years later, he started working on projects for iOS, Android, and naturally Windows phone. After many PHP-based web projects, in late 2012, he moved on to the Yii framework as his primary framework for developing web applications. Since then, he has built many important projects based on Yii 1 and later on Yii 2, day by day discovering the powerful improvement that Yii provides to getting work done. Now he lives in Sacrofano, a small town near Rome, with his wife, Serena.
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