


How to implement cascading drop-down menu in yii, implement drop-down menu in yii_PHP tutorial
How to implement cascading drop-down menu in yii, implement drop-down menu in yii
This article details the method of implementing cascading drop-down menus in Yii. The specific steps are as follows:
1. Add the following code to the template:
<?php echo $form->dropDownList($model, 'src_type_id', OrderSrc::options(), array( <span style="white-space:pre"> </span>'id' => 'task-order-src-id', )); echo $form->dropDownList($model, 'src_shop_id', array(''=>'全部'), array( <span style="white-space:pre"> </span>'id' => 'task-shop-id', )) ?>
In this code, OrderSrc_options() first reads a drop-down menu. Call the options method in the OrderScr model. The content is as follows
public static function options($hasShop = true) { $model = new self(); if($hasShop) $model->hasShop(); $models = $model->findAll(); $array = array(''=>'全部'); foreach($models as $model) { $array[$model->src_id] = $model->src_name; } return $array; }
2. Then add JS code to the template page to assign content to the second drop-down menu when the first drop-down menu changes.
<script type='text/javascript'> $().ready(function(e) { $('#task-order-src-id').change(function(e) { refreshShops(); }); refreshShops(); function refreshShops() { $.get('<?php echo $this->createUrl('getShops')?>', { 'srcId': $('#task-order-src-id').val() }, function(html_content) { $('#task-shop-id') .html(html_content) .find('option[value=<?php echo $model->src_shop_id?>]') .attr('selected', 'selected'); }); } }); </script>
In this JS code, a program is called to obtain the value of the second drop-down menu (call the actionGetShops method in the Controller), and any value is appended to the second drop-down menu.
The actionGetShops method in Controller is as follows:
public function actionGetShops() { $srcId = $_GET['srcId']; $array = ThirdpartInterfaceConfig::options($srcId); $htmlContent = "<option value=''>全部</options>"; foreach($array as $k=>$v) { $htmlContent .= "<option value='{$k}'>{$v}</option>"; } echo $htmlContent; }
Use ajax to send the selected data to the controller, and obtain the results and display them on the view
Use ajax and trigger the onchange event to submit

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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