


A complete example of using php+mysql combined with Ajax to implement the like function, mysqlajax_PHP tutorial
php+mysql combined with Ajax to implement a complete example of the like function, mysqlajax
The example in this article describes the method of php+mysql combined with Ajax to implement the like function. Share it with everyone for your reference. The details are as follows:
To realize the like function, there are many ways to implement it. Here is a summary of the functions of using Ajax, php and mysql to realize the like data. The specific steps are as follows:
1. The HTML code part in the page:
<span>0</span> <button onclick="goodplus(1);">good+1</button> <span>0</span> <button onclick="goodplus(2);">good+1</button> <span>0</span> <button onclick="goodplus(3);">good+1</button> <span>0</span> <button onclick="goodplus(4);">good+1</button>
2. Write javascript
1. Implement the click event of the button above goodplus
var span = document.getElementsByTagName('span');//获取存放点赞数的dom var num; //点赞数 var flag = 0; //不同情况的标记 function goodplus(gindex){ flag = 1; num = parseInt(span.item(gindex-1).innerHTML); if(checkcookie(gindex) == true){ num = num + 1; senddata(gindex); //通过Ajax修改页面上的数据 }else{ alert("你已经点过赞咯!") } }
2. The like data should be updated as soon as the page is opened
for(var i = 1; i < span.length + 1; i++){ senddata(i); }
3. Get data through Ajax senddata function
function senddata(aindex){ var xmlhttp; var txt; if(window.XMLHttpRequest){ xmlhttp=new XMLHttpRequest(); }else{ xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function(){ if(xmlhttp.readyState == 4 && xmlhttp.status == 200){ txt = xmlhttp.responseText; //获取返回的数据 var cookieindex = aindex - 1; document.getElementsByTagName('span').item(cookieindex).innerHTML = txt; //赋值 } } xmlhttp.open("GET","路径/index.php?num=" + num + '&flag=' + flag + '&aindex=' + aindex,true); xmlhttp.send(); }
4. Set a cookie to determine whether it has been liked. If there is a cookie, it will prompt that it has been liked. If there is no cookie, the like will be allowed and the cookie will be set
//判断是否已经存在了cookie function checkcookie(gindex){ var thiscookie = 'goodplus' + gindex; var mapcookie = getCookie(thiscookie) if (mapcookie!=null && mapcookie!=""){ return false; }else { setCookie(thiscookie,thiscookie,365); return true; } } //获取cookie function getCookie(c_name){//获取cookie,参数是名称。 if (document.cookie.length > 0){//当cookie不为空的时候就开始查找名称 c_start = document.cookie.indexOf(c_name + "="); if (c_start != -1){ //如果开始的位置不为-1就是找到了、找到了之后就要确定结束的位置 c_start = c_start + c_name.length + 1 ; //cookie的值存在名称和等号的后面,所以内容的开始位置应该是加上长度和1 c_end = document.cookie.indexOf(";" , c_start); if (c_end == -1) { c_end = document.cookie.length; } return unescape(document.cookie.substring(c_start , c_end));//返回内容,解码。 } } return ""; } //设置cookie function setCookie(c_name,value,expiredays){ //存入名称,值,有效期。有效期到期事件是今天+有效天数。然后存储cookie, var exdate=new Date(); exdate.setDate( exdate.getDate() + expiredays ) document.cookie = c_name + "=" + escape(value) + ((expiredays==null) ? "" : "; expires=" + exdate.toGMTString()) }
3. index.php page:
<?php $num = $_GET['num']; $aindex = $_GET['aindex']; $con = mysql_connect("localhost","root",""); if (!$con){ die('Could not connect: ' . mysql_error()); } mysql_select_db("goodplus", $con); $sql0s = "SELECT * FROM `good` where `id` = ".$aindex; $sql0 = mysql_query($sql0s); if($_GET['flag'] == 0){ while($row = mysql_fetch_array($sql0)){ echo $row['value']; } }else if($_GET['flag'] == 1){ $sql="UPDATE `goodplus`.`good` SET `value` = '".$num."' WHERE `good`.`id` = ".$aindex; if (!mysql_query($sql,$con)){ die('Error: ' . mysql_error()); } echo $num; } mysql_close($con) ?>
4. The final index.html page is as follows:
无标题文档 <span>0</span> <button onclick="goodplus(1);">good+1</button> <span>0</span> <button onclick="goodplus(2);">good+1</button> <span>0</span> <button onclick="goodplus(3);">good+1</button> <span>0</span> <button onclick="goodplus(4);">good+1</button>
I hope this article will be helpful to everyone’s PHP programming design.

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