PHP implementation of WeChat applet side sliding menu techniques

With the popularity of WeChat mini programs, more and more developers are beginning to use it to develop various applications. In mini programs, side-sliding menus are a common UI interface. Users can open or close the menu by sliding left or right. This article will introduce how to use PHP to implement the sliding menu technique of WeChat mini program.

1. Prerequisites

Before starting to introduce how to implement the side sliding menu of WeChat mini programs, you need to understand some prerequisites:

1. Understand the basic development of WeChat mini programs Knowledge, including mini program architecture, JS, CSS, HTML, etc.

2. You must be able to program using PHP.

3. You need to understand the interfaces and events in the WeChat applet.

2. Create a menu

Creating a menu in a WeChat applet requires the following steps:

1. First, you need to create a component in the wxml file of the applet, as Container for the menu. You can use , , and other components to choose the appropriate component according to specific needs.

For example:

<scroll-view class="menu">
  <view class="menu-item">菜单项1</view>
  <view class="menu-item">菜单项2</view>
  <view class="menu-item">菜单项3</view>
</scroll-view>

2. Create a button in the wxml file. Clicking the button will open the menu.

For example:

<button class="btn-menu" bindtap="showMenu">打开菜单</button>

3. Set the styles of menus and buttons in the wxss file. You can set width, height, background color and other styles.

For example:

.menu {
  position: fixed;
  top: 0;
  left: -80%;
  width: 80%;
  height: 100%;
  background-color: #fff;
  transition: all 0.3s;
}

.btn-menu {
  position: fixed;
  top: 10px;
  right: 10px;
  width: 50px;
  height: 50px;
  background-color: #333;
  color: #fff;
  border-radius: 50%;
  text-align: center;
  line-height: 50px;
}

4. Write events for opening and closing the menu in the JS file of the mini program.

For example:

Page({
  data: {
    isMenuShow: false // 菜单是否显示
  },
  // 打开菜单
  showMenu: function () {
    this.setData({
      isMenuShow: true
    })
  },
  // 关闭菜单
  hideMenu: function () {
    this.setData({
      isMenuShow: false
    })
  }
})

5. Finally, bind the touchstart, touchmove, touchend events of the menu container in the wxml file to achieve the sliding effect of the menu.

For example:

<scroll-view class="menu" bindtouchstart="touchstart" bindtouchmove="touchmove" bindtouchend="touchend">
  <view class="menu-item">菜单项1</view>
  <view class="menu-item">菜单项2</view>
  <view class="menu-item">菜单项3</view>
</scroll-view>

Among them, the implementation of touchstart, touchmove, touchend events is as follows:

/**
* 记录手指起始位置
*/
touchstart: function (e) {
  this.touchX = e.changedTouches[0].clientX
},

/**
* 菜单跟随手指移动
*/
touchmove: function (e) {
  var moveX = e.changedTouches[0].clientX
  var distanceX = this.touchX - moveX // 手指移动的距离
  var menuWidth = parseInt(this.menuWidth)
  var left = this.data.menuLeft
  left -= distanceX
  if (left < -menuWidth) { // 边界判断
    left = -menuWidth
  } else if (left > 0) {
    left = 0
  }
  this.setData({
    menuLeft: left
  })
  this.touchX = moveX
},

/**
* 手指离开，根据偏移量决定菜单是否关闭
*/
touchend: function (e) {
  var left = this.data.menuLeft
  var menuWidth = parseInt(this.menuWidth)
  if (left < -menuWidth / 2) {
    this.setData({
      isMenuShow: false
    })
  } else {
    this.setData({
      menuLeft: 0
    })
  }
}

3. PHP implementation

After understanding how to create a menu , the following introduces how to use PHP to implement the side sliding menu technique of WeChat mini program. The key to implementation is to save the code of the WeChat applet into a PHP file and assemble it into a complete applet page and return it to the client.

1. First, create a function in the PHP file to return the complete applet page.

For example:

function getMenuPage() {
  // 读取小程序的wxml、wxss、JS文件内容
  $wxml = file_get_contents('./menu.wxml');
  $wxss = file_get_contents('./menu.wxss');
  $js = file_get_contents('./menu.js');
  // 拼装成完整的小程序页面，并返回给客户端
  $page = '<!DOCTYPE html>
    <html>
        <head>
            <title>菜单</title>
            <style>'.$wxss.'</style>
            <script>'.$js.'</script>
        </head>
        <body>
            '.$wxml.'
        </body>
    </html>';
  header('Content-Type: text/html; charset=utf-8');
  echo $page;
}

2. In the applet, when accessing the PHP file, you need to set the request method to GET and pass the data in the URL to tell the PHP file which applet to return. program page.

For example:

wx.request({
  url: 'http://example.com/menu.php?page=getMenu',
  method: 'GET',
  success: function (res) {
    // 将返回的HTML代码插入到页面中
    $('.container').append(res.data)
  },
  fail: function (res) {
    console.log(res)
  }
})

3. The PHP file receives the request and returns the corresponding mini program page according to the passed parameters.

For example:

$action = $_GET['page'];
switch ($action) {
  case 'getMenu':
    getMenuPage();
    break;
  default:
    echo '页面不存在！';
    break;
}

To sum up, using PHP to implement the sliding menu technique of WeChat mini program requires mastering the knowledge of WeChat mini program development and PHP programming skills. What needs to be noted is that returning through PHP The mini program page needs to deal with encoding issues. Through the introduction of this article, I believe that readers have a deeper understanding of using PHP to implement the side sliding menu of WeChat mini programs.

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