How to use PHP to implement multi-layer menus in WeChat mini programs

With the popularity of WeChat mini programs, more and more people want to learn how to implement multi-layer menus in WeChat mini programs to improve the user experience and the aesthetics of the interface. This article will introduce how to use PHP to implement multi-layer menus in WeChat mini programs.

1. Understand the menu structure of the WeChat applet

In the WeChat applet, the menu structure is composed of a series of pages. Each page has a unique route identifier through which navigation operations can be performed in the program. Pages in WeChat mini programs can be divided into three types: first-level pages, second-level pages and third-level pages. Among them, the first-level page is the main page of the mini program and is displayed directly in the tabBar; while the second-level page and the third-level page are entered through the first-level page and can be understood as sub-pages of the second-level page and the third-level page.

2. Basic principles of using PHP to implement multi-layer menus

Using PHP to implement multi-layer menus in WeChat mini programs needs to meet the following basic requirements:

1. Able to obtain menu data from the server, including the menu name and corresponding routing path;
2. Use the array operation function provided by PHP to convert the menu data into a two-dimensional array;
3. Use PHP to implement the recursive algorithm and traverse Two-dimensional array, generate the menu of the mini program;
4. Implement page jump according to the menu routing to realize the navigation function.

3. Specific steps to implement multi-layer menu

1. Prepare menu data

Menu data can be stored using PHP arrays. Each element includes the name of the menu and Routing path information. In order to implement a multi-level menu, it is necessary to use a nested structure of an array to represent it. The following is an example:

$menu_data = array(
   array(
      'name' => '菜单1',
      'path' => '/pages/menu1/menu1',
      'submenus' => array(
         array(
            'name' => '菜单1-1',
            'path' => '/pages/menu1-1/menu1-1',
         ),
         array(
            'name' => '菜单1-2',
            'path' => '/pages/menu1-2/menu1-2',
            'submenus' => array(
               array(
                  'name' => '菜单1-2-1',
                  'path' => '/pages/menu1-2-1/menu1-2-1',
               ),
            ),
         ),
      ),
   ),
   array(
      'name' => '菜单2',
      'path' => '/pages/menu2/menu2',
   ),
);

2. Use recursive algorithm to generate menu

Using PHP's recursive algorithm, you can traverse the menu data and generate the menu of the applet. The following is a sample code:

function generateMenu($menu_data) {
   echo '<view class="menu">';
   foreach ($menu_data as $item) {
      if (isset($item['submenus'])) {
         echo '<view class="submenu">';
         echo '<text>' . $item['name'] . '</text>';
         generateMenu($item['submenus']);
         echo '</view>';
      } else {
         echo '<view class="menu-item" data-path="' . $item['path'] . '">';
         echo '<text>' . $item['name'] . '</text>';
         echo '</view>';
      }
   }
   echo '</view>';
}

In this code, the generateMenu() function accepts menu data as a parameter and generates a menu by recursively traversing the menu data. For each menu item, if there is a submenu, the generateMenu() function is called recursively, otherwise the menu item is generated directly.

3. Implement page navigation function

Generating menu is the first step. How to implement page navigation? In the mini program, the page navigation function can be implemented through the wx.navigateTo() function. This function accepts a string parameter indicating the page path to jump to. When a menu item is clicked, the wx.navigateTo() function can be called by binding an event to implement page jump. The following is a sample code:

$('.menu-item').on('tap', function (event) {
   var path = $(this).data('path');
   wx.navigateTo({
      url: path,
   });
});

In this code, by binding the click event of the menu item, the routing path corresponding to the menu item is obtained, and then the wx.navigateTo() function is called to realize the page jump.

4. Notes

1. When using the recursive algorithm, pay attention to whether the array is empty, otherwise it will cause the function to recurse infinitely, causing an infinite loop;
2. When calling wx When using the .navigateTo() function, make sure that the page path to jump to is correct, otherwise the page jump failure will occur.

5. Summary

This article introduces how to use PHP to implement multi-layer menus in WeChat mini programs, and demonstrates the specific implementation method through sample code. When implementing multi-layer menus, pay attention to the use of recursive algorithms and the correctness of page jump paths. Through studying this article, I believe you have mastered the skills of implementing WeChat mini program menus in PHP. I hope it can be helpful to all mini program developers.

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