Implementation method of drop-down menu developed in PHP in WeChat applet

Today we will learn how to implement the drop-down menu developed in PHP in the WeChat applet. WeChat mini program is a lightweight application that users can use directly in WeChat without downloading and installing, which is very convenient. PHP is a very popular back-end programming language and a language that works well with WeChat mini programs. Let's take a look at how to use PHP to develop drop-down menus in WeChat mini programs.

First of all, we need to prepare the development environment, including PHP, WeChat applet development tools and servers. Then we can start writing code. The following is a basic PHP code for getting drop-down menu data:

<?php
    $dataArray=array('A','B','C','D','E');
    echo json_encode($dataArray);
?>

In the above code, we define an array $dataArray, which contains the data of the drop-down menu. Then we use the json_encode function to convert the array into a JSON format string and output it through the echo statement.

The following is the implementation method of calling the above PHP code in the WeChat applet:

// 定义全局变量
var app = getApp();

Page({
  data: {
    selectArray:[],
    selectIndex:0
  },
  onLoad: function () {
    var that=this;
    // 发送网络请求，获取数据
    wx.request({
      url: app.globalData.serverUrl+'/getData.php',
      method:'GET',
      success:function(res){
        that.setData({
          selectArray:JSON.parse(res.data)
        })
      }
    })
  },
  // 下拉菜单选项改变时触发该函数
  bindPickerChange:function(e){
    this.setData({
      selectIndex:e.detail.value
    })
  }
})

In the above code, we first define a global variable app to store global data. Then, two variables are defined in the data of the page, one is used to store the option array selectArray in the drop-down menu, and the other is used to store the index selectIndex of the currently selected drop-down menu option. When the page loads, we use the wx.request function to send a request to the server to obtain the drop-down menu data. After the request is successful, the requested JSON format data is converted into an array through the setData function and stored in selectArray. When the drop-down menu option changes, we will trigger a bindPickerChange function to store the index of the currently selected drop-down menu option into selectIndex.

Finally, we need to add a drop-down menu component to the page:

<view>
  <picker bindchange="bindPickerChange" value="{{selectIndex}}" range="{{selectArray}}">
    <view class="picker">{{selectArray[selectIndex]}}</view>
  </picker>
</view>

In the above code, we use the picker component to implement the drop-down menu function. We bind the drop-down menu option array selectArray to the range attribute, bind the selected drop-down menu option index selectIndex to the value attribute, and trigger the bindPickerChange event when the option changes. Inside the picker, we use the view component to display the currently selected drop-down menu option.

The above is the implementation method of drop-down menu developed in PHP in WeChat applet. With the above code, we can easily implement the drop-down menu function and interact with the server.

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