Backend Development
PHP Tutorial
Yii2 implements three-level linkage examples of provinces and municipalities in China
Yii2 implements three-level linkage examples of provinces and municipalities in China
Yii2 realizes the three-level linkage instance of China's provinces and municipalities
Installation
Add to your composer.json file
"chenkby/yii2-region": "dev-master"
Switch to the project Directory
composer update;
3. Configuration
1) Add the following method in the model of the region
public static function getRegion($parentId=0)
{
$result = static::find()->where(['parent_id'=>$parentId])->asArray()->all();
return ArrayHelper::map($result, 'id', 'name');
}2) In the controller Add the following action
public function actions()
{
$actions=parent::actions();
$actions['get-region']=[
'class'=>\chenkby\region\RegionAction::className(),
'model'=>\app\models\Region::className()
];
return $actions;
}3) Add enablePrettyUrl of urlManager in main.php in common/config, that is, hide index.php
"urlManager" => [
//用于表明urlManager是否启用URL美化功能，在Yii1.1中称为path格式URL，
// Yii2.0中改称美化。
// 默认不启用。但实际使用中，特别是产品环境，一般都会启用。
"enablePrettyUrl" => true,
// 是否启用严格解析，如启用严格解析，要求当前请求应至少匹配1个路由规则，
// 否则认为是无效路由。
// 这个选项仅在 enablePrettyUrl 启用后才有效。
"enableStrictParsing" => false,
// 是否在URL中显示入口脚本。是对美化功能的进一步补充。
"showScriptName" => false,
// 指定续接在URL后面的一个后缀，如 .html 之类的。仅在 enablePrettyUrl 启用时有效。
"suffix" => "",
"rules" => [
"<controller:\w+>/<id:\d+>"=>"<controller>/view",
"<controller:\w+>/<action:\w+>"=>"<controller>/<action>"
],
],4. Use
<?= $form->field($model, 'district')->widget(\chenkby\region\Region::className(),[
'model'=>$model,
'url'=> \yii\helpers\Url::toRoute(['get-region']),
'province'=>[
'attribute'=>'province',
'items'=>Region::getRegion(),
'options'=>['class'=>'form-control form-control-inline','prompt'=>'选择省份']
],
'city'=>[
'attribute'=>'city',
'items'=>Region::getRegion($model['province']),
'options'=>['class'=>'form-control form-control-inline','prompt'=>'选择城市']
],
'district'=>[
'attribute'=>'district',
'items'=>Region::getRegion($model['city']),
'options'=>['class'=>'form-control form-control-inline','prompt'=>'选择县/区']
]
]);
?>The above is the entire content of this article. I hope it will be helpful to everyone's study. I also hope that everyone will support the PHP Chinese website.
MoreYii2 implements three-level linkage examples of provinces and municipalities in ChinaFor related articles, please pay attention to the PHP Chinese website!
Related articles:
Use PHP to realize three-level linkage in urban areas with attached database
js to realize the effect of three-level linkage menu in provinces and municipalities
Example code to implement ajax three-level linkage drop-down menu
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Alipay PHP SDK transfer error: How to solve the problem of 'Cannot declare class SignData'?
Apr 01, 2025 am 07:21 AM
Alipay PHP...
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
How does session hijacking work and how can you mitigate it in PHP?
Apr 06, 2025 am 12:02 AM
Session hijacking can be achieved through the following steps: 1. Obtain the session ID, 2. Use the session ID, 3. Keep the session active. The methods to prevent session hijacking in PHP include: 1. Use the session_regenerate_id() function to regenerate the session ID, 2. Store session data through the database, 3. Ensure that all session data is transmitted through HTTPS.
Describe the SOLID principles and how they apply to PHP development.
Apr 03, 2025 am 12:04 AM
The application of SOLID principle in PHP development includes: 1. Single responsibility principle (SRP): Each class is responsible for only one function. 2. Open and close principle (OCP): Changes are achieved through extension rather than modification. 3. Lisch's Substitution Principle (LSP): Subclasses can replace base classes without affecting program accuracy. 4. Interface isolation principle (ISP): Use fine-grained interfaces to avoid dependencies and unused methods. 5. Dependency inversion principle (DIP): High and low-level modules rely on abstraction and are implemented through dependency injection.
How to debug CLI mode in PHPStorm?
Apr 01, 2025 pm 02:57 PM
How to debug CLI mode in PHPStorm? When developing with PHPStorm, sometimes we need to debug PHP in command line interface (CLI) mode...
Framework Security Features: Protecting against vulnerabilities.
Mar 28, 2025 pm 05:11 PM
Article discusses essential security features in frameworks to protect against vulnerabilities, including input validation, authentication, and regular updates.
How to automatically set permissions of unixsocket after system restart?
Mar 31, 2025 pm 11:54 PM
How to automatically set the permissions of unixsocket after the system restarts. Every time the system restarts, we need to execute the following command to modify the permissions of unixsocket: sudo...
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
