Examples to explain how to use ajax

This article mainly brings you an article about how to use ajax_examples and ajax data processing. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor to take a look, I hope it can help everyone.

It should be noted that the encapsulated database called and the jQuery storage address

1. Registration

(1) Write a text box to verify the user name

<input>
<span></span> //这个使用来显示提示信息的

(2) Use jQuery statement to write: The user name exists and cannot be used, the user name can be used

$("#uid").blur(function(){
　　//取用户名
　　var uid = $(this).val();
　　//查数据库，调ajax
　　$.ajax({  //ajax方法中必须是json格式
  url: "zhucecl.php",  //处理页面的地址
  data:{u:uid},  //这里是Json的格式:u是起的个名字，uid才是值
  type:"POST", //数据提交方式
  dataType:"TEXT",  //返回的数据格式:字符串格式
  success:function(data){  //成功的话返回匿名函数（回调函数）
      //执行处理页面成功后的语句
      var str = "";
                 
      if(data=="OK")
      {
      　　str = "用户名可以使用";
      　　$("#tishi").css("color","green");
      }
      else
      {
      　　str = "已有用户名";  
      　　$("#tishi").css("color","red");
      }
      $("#tishi").text(str);
    　　}
　　　　　　});     
})

(3) Registration processing page: Written I’ve done this many times, so I won’t explain it sentence by sentence

<?php //调封装好的类：注意保存位置
include("DBDA.class.php");
$db = new DBDA();
 
//传的值起的名字
$uid = $_POST["u"];
$sql = "select count(*) from renyuan where username=&#39;{$uid}&#39;";
 
//调用封装的函数
$attr =$db->Query($sql);
 
//判断用户名是否存在
if($attr[0][0]>0)
{
　　echo "NO"; //有重复的用户名
}
else
{
　　echo "OK";  //没有重复的用户名
}
 
?>

2. Login

(1) Write the text box and login button

<p>账号：<input></p>
<p>密码：<input></p>
<input>

(2) Write jQuery statements

$("#btn").click(function(){
　　var uid=$("#uid").val(); //找到用户
　　var pwd=$("#pwd").val(); //找到密码
 
　　//调ajax方法，里面要用json格式
　　$.ajax({
  url:"denglucl.php", //登陆的处理页面
  data:{uid:uid,pwd:pwd}, 
  type:"POST",
  dataType:"text",
  success: function(data)
  {
    if(data.trim()=="OK")
    {
      window.location.href="zhuce.php" rel="external nofollow" ; //用户名密码正确，进入一个页面
    }
    else
    {
      alert("用户名密码输入错误");
    }
  }
　　})
       
})

(3) Login processing page: I have written it many times, so I won’t explain it step by step

<?php include("DBDA.class.php");
$db = new DBDA();
 
$uid = $_POST["uid"];
$pwd = $_POST["pwd"];
 
$sql = "select mima from huiyuan where yonghu=&#39;{$uid}&#39;";
$attr = $db->Query($sql);
 
if(!empty($pwd) && !empty($attr) && $attr[0][0]==$pwd) //密码不为空，数组不为空，输入密码和查出的密码是否相同
{
　　echo "OK";  
}
else
{
　　echo "ON";  
}

　

Successful login:

3. Ajax data processing

(1) First display the name row, Just edit it normally. The content you want to display

　　                               　　

代号

名称

价格

产地

库存

操作

(2) Write a table to display the content

<tbody>
　　//里面放遍历的某个表中的数据内容
</tbody>

(3) Write jQuery and load the page After completion, execute

$(document).ready(function(e) {
　　$.ajax({
  url:"xianshicl.php",  
  dataType:"TEXT",
  success: function(data){
    //处理页面处理完成后执行的
    　　 });

(4) Write the display data processing page (two methods)

include("DBDA.class.php"); //调用封装好的类：注意存在位置
$db = new DBDA(); //造新对象
   
$sql = "select * from fruit"; //写sql语句
   
echo $db->StrQuery($sql);  //1.调用封装好的拼接数组为字符串的方法
/* //2.
$attr = $db->Query($sql); //调用封装类中的方法来执行sql语句
$str = "";
foreach($attr as $v)
{
　　$str .= implode("^",$v)."|"; //拼接数组为字符串
}
       
echo substr($str,0,strlen($str)-1); //截取字符串：最后的拼接符不显示<br>*/

(5) After the processing page is completed, write in the success method in ajax on the main page The statement after entering the processing page

success: function(data){
　　var hang = data.split("|"); //拆分字符“|”串：显示行
           
　　var str = "";
　　for(var i=0;i<hang.length><td>"+lie[0]+"</td>
<td>"+lie[1]+"</td>
<td>"+lie[2]+"</td>
<td>"+lie[3]+"</td>
<td>"+lie[5]+"</td>
<td>操作</td>";  //显示的行和单元格
　　}
           
　　$("#bg").html(str);
}</hang.length>

is displayed like this:

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