Summary of the drop-down menu function implemented by php framework and ajax

In development, it is still challenging to use PHP and PHP framework to implement drop-down menus or navigation menus. Generally, in addition to using back-end languages, some front-end technologies are used in conjunction. When the drop-down menu changes, the event is triggered and then sent to the PHP background for data processing through ajax technology. The following article will explain in detail how to use technologies such as php framework and ajax to implement the function of drop-down menu.

First, you can first understand the relevant content introduction in "Various Drop-down Menu Implementation Tutorial"

This course goes from easy to difficult, step by step, from static web page layout to using different technologies such as HTML/CSS, JavaScript, and jQuery to implement dynamic drop-down menus, allowing you to Master the production of drop-down menus and code debugging between different browsers to solve browser compatibility issues.

2. Use the php framework to implement the drop-down menu function

1. Multi-level linkage drop-down menu implemented by Yii

Mainly introduces the multi-level linkage drop-down menu implemented by Yii, including the relevant implementation codes of views, models and controllers, and involves related operation skills such as database query, array traversal and data display based on Yii, for those who need it Friends refer to study.

2. Yii2 framework dropDownList drop-down menu usage example analysis

dropDownList is a built-in drop-down function in the yii framework. We can directly use dropDownList to implement the html select menu.

2.1. dropDownList ---> yii2.0 drop-down list method
2.2. ArrayHelper::map() ---> Construct a one-dimensional or (key => value) Multidimensional array
2.3.1, $data ---> data source
2.3.2, id ---> value of option
2.3.3, customer_name ---> option label The value of

3. How to export excel drop-down menu from PHPExcel

PHPExcel export steps: 1: Introduce the official website download class library; 2: Instantiate the PHPExcel class (create a new one excel table); three: createSheet() method, setActveSheetIndex method, getActiveSheel method (create sheet built-in table); four: setCellValue() method (fill data); five: PHPExcel_IOFactory::createWriter() method, save() method (save File)

3. Ajax to implement drop-down menu functions and effects

1. Example code to implement ajax three-level linkage drop-down menu

Let’s talk about the idea:

(1) When the user selects a province, the event is triggered and the current province id is requested through ajax. In the program passed to the server

(2) For example, if the Chinese region is taken, China is 0001, then the one with the number 0001 is the Chinese region;

(3) The server is based on the client's Request, query the database, and return to the client in a certain format

2. ThinkPHP + Ajax implements a 2-level linkage drop-down menu

Ajax code is in the first layer type Triggered after the change, the main parameters of the ajax method are

1) url: the address where the ajax is received in the background;

2) data: the data passed to the background, usually passed in json; what is passed here Is the id value of the selected class.

3) type: transfer method, there are get and post methods. I usually use post, which can transmit more data than get, and is more secure;

4) error: ajax execution Failure method;

5) success: Ajax execution method that is successful, which is the callback function. When executing success here, I first use empty() to clear the contents of the second drop-down menu, and then output the data obtained from the background.

php, php framework, ajax related questions and answers to implement the drop-down menu function

##1.

Drop-down menu click event

2.

How to obtain background data through ajax after selecting from the drop-down menu without refreshing the page

3. thinkphp How can the drop-down menu select different drop-down menu items by default according to the parameters passed by assign?

【Related recommendations】

1. html+css Summary of making drop-down menus of various styles

2. PHP Chinese Free download of web navigation special effects

3. Summary of using JavaScript to implement drop-down menu functions

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