PHP implementation of WeChat applet secondary confirmation box techniques

With the popularity of WeChat mini programs, in addition to basic page display and interaction, some advanced techniques are also needed to improve user experience and security in mini program development. Among them, the secondary confirmation box function is an indispensable skill. This article will introduce how to use PHP to implement the secondary confirmation box of WeChat mini programs, making you more comfortable in mini program development.

1. What is the secondary confirmation box

The secondary confirmation box is a commonly used prompt box that usually appears on important operations, such as deletion, submission, etc. When the user clicks the action button, before confirming deletion, submission, etc., a secondary confirmation box will appear to prompt the user to confirm again. This can avoid user misoperation and also improve the security of the system.

2. Why use PHP to implement the secondary confirmation box

The front end of the WeChat applet is mainly composed of three languages: wxml, wxss and JavaScript. JavaScript is mainly used to implement business logic and pages. Interaction. However, since JavaScript is a scripting language and is vulnerable to attacks, the security of the back-end server is particularly important in small program development.

PHP is a back-end language widely used in website development. It has high security and flexibility and is widely loved by developers. Therefore, using PHP to implement the secondary confirmation box of the WeChat applet can not only improve the security of the system, but also meet the needs of complex business operations.

3. Steps to use PHP to implement the secondary confirmation box of the WeChat applet

1. Introduce the PHP file

In the JavaScript code of the WeChat applet, By requesting PHP files through Ajax, you can interact with PHP files. Therefore, before implementing the secondary confirmation box, you need to introduce the PHP file into the JavaScript file.

The following is a simple example code for introducing a PHP file:

var xmlhttp;
if (window.XMLHttpRequest){ // code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
}else{ // code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}

xmlhttp.onreadystatechange=function(){
  if (xmlhttp.readyState==4 && xmlhttp.status==200){
    document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
  }
}
xmlhttp.open("GET","confirm.php",true);
xmlhttp.send();

This code first determines the current browser compatibility standard, creates an XMLHttpRequest object, and then opens the PHP file with the open() method connection and sends a request to the server through the send() method. When the server returns data, listen to the return status through the onreadystatechange event and update the front-end page.

2. Writing PHP files

In the PHP file, you need to write corresponding code to obtain front-end data and handle database operations. The following is a simple PHP file code example:

<?php
header ( 'Content-type: text/html;charset=utf-8' ); //设置头部信息，避免乱码

$confirm = $_POST['confirm']; //获取前端传递的参数

if ($confirm == "true") {
  //输入数据库操作语句，实现删除、提交等操作
  echo "确认成功";
}else{
  echo "取消确认";
}
?>

In this code, $_POST['confirm'] is used to obtain the parameters passed by the front end and determine whether the user clicked the confirm button. If the confirmation button is clicked, the corresponding operation is implemented through the database operation statement; if the cancel button is clicked, only a prompt message is returned.

3. Implementing the WeChat applet interface

In the wxml file of the WeChat applet interface, it is necessary to implement the style settings of front-end controls such as buttons, and add corresponding click events. Trigger Ajax to call PHP file and pass parameters. The following is a simple wxml file code example:

<button type="primary" bindtap="confirm">提交</button>

<confirm>{{message}}</confirm>

In this code, the button button is bound to a confirm function. When the user clicks the button, this function will be triggered. At the same time, the content of the confirmation box is bound through {{message}}.

In the JavaScript file, the code to implement the confirm function is as follows:

function confirm() {
  wx.showModal({
    title: '提交前，请确定信息填写无误。',
    confirmText: "确定提交",
    cancelText: "返回修改",
    success: function (res) {
      if (res.confirm) {
        wx.request({
          url: 'confirm.php',
          data: {
            confirm: true
          },
          method: 'POST',
          header: {
            'content-type': 'application/x-www-form-urlencoded'
          },
          success: function (res) {
            console.log(res.data)
          }
        })
      } else {
        wx.request({
          url: 'confirm.php',
          data: {
            confirm: false
          },
          method: 'POST',
          header: {
            'content-type': 'application/x-www-form-urlencoded'
          },
          success: function (res) {
            console.log(res.data)
          }
        })
      }
    }
  })
}

In this code, the confirmation box is first displayed through the wx.showModal() function, and the confirm and cancel buttons are set. text. When the user clicks the confirm button, send a request to the PHP file through wx.request() and set the confirm parameter to true; when the user clicks the cancel button, set the confirm parameter to false. The results returned by the PHP file can be output in the front-end JavaScript code through console.log().

4. Advantages of using PHP to implement the secondary confirmation box of the WeChat applet

Using PHP to implement the secondary confirmation box of the WeChat applet has some obvious advantages compared to pure JavaScript implementation:

1. Improve data security. As a server-side language, PHP can implement more security protection measures to avoid malicious attacks.
2. Can implement complex business logic. PHP has more powerful data processing capabilities and can implement complex business logic such as database operations and file operations.
3. The code is highly maintainable. Using PHP code can improve the maintainability of the code, reduce the coupling of the code, and facilitate team development and maintenance.

5. Summary

This article introduces how to use PHP to implement the secondary confirmation box of WeChat applet. By using PHP, we can handle data and business logic more flexibly and improve the security of the system. I hope this article can provide some help to WeChat applet developers.

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