php+mysql結合Ajax實現點贊功能完整實例
文章主要介紹了php+mysql結合Ajax實現點贊功能,以一個完整實例形式詳細分析了實現點贊功能中涉及的html頁面、Ajax功能及php方法的使用技巧,非常具有實用價值,需要的朋友可以參考下。
要實現點贊功能，有多種實現方式，這里總結一下利用Ajax，php和mysql來實現點贊的數據的功能。具體步驟如下：
一、頁面中的HTML代碼部分：
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<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>
二、寫javascript
1、實現上面的button的點擊事件goodplus
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var span = document.getElementsByTagName('span');/pic/p>
var num; /pic/p>
var flag = 0; /pic/p>
function goodplus(gindex){
flag = 1;
num = parseInt(span.item(gindex-1).innerHTML);
if(checkcookie(gindex) == true){
num = num + 1;
senddata(gindex); /pic/p>
}else{
alert("你已經點過贊咯！")
}
}
2、頁面一打開時就應該更新點贊數據
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for(var i = 1; i < span.length + 1; i++){
senddata(i);
}
3、通過Ajax獲取數據senddata函數
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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; /pic/p>
var cookieindex = aindex - 1;
document.getElementsByTagName('span').item(cookieindex).innerHTML = txt; /pic/p>
}
}
xmlhttp.open("GET","路徑/index.php?num=" + num + '&flag=' + flag + '&aindex=' + aindex,true);
xmlhttp.send();
}
4、通過設置cookie來判斷是否已經點贊，如果有cookie則提示已經點贊，如果沒有cookie則允許點贊，而且會設置cookie
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/pic/p>
function checkcookie(gindex){
var thiscookie = 'goodplus' + gindex;
var mapcookie = getCookie(thiscookie)
if (mapcookie!=null && mapcookie!=""){
return false;
}else {
setCookie(thiscookie,thiscookie,365);
return true;
}
}
/pic/p>
function getCookie(c_name){/pic/p>
if (document.cookie.length > 0){/pic/p>
c_start = document.cookie.indexOf(c_name + "=");
if (c_start != -1){ /pic/p>
c_start = c_start + c_name.length + 1 ;
/pic/p>
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));/pic/p>
}
}
return "";
}
/pic/p>
function setCookie(c_name,value,expiredays){
/pic/p>
var exdate=new Date();
exdate.setDate( exdate.getDate() + expiredays )
document.cookie = c_name + "=" + escape(value) + ((expiredays==null) ? "" : "; expires=" + exdate.toGMTString())
}
三、index.php頁面：
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<?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)
?>
四、最終的index.html頁面如下：
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<!DOCTYPE html PUBLIC "-/pic/pic/pic/pic/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="/pic/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>無標題文檔</title>
</head>
<body>
<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>
<script type="text/javascript">
var span = document.getElementsByTagName('span');
var num;
var flag = 0;
for(var i = 1; i < span.length + 1; i++){
senddata(i);
}
function goodplus(gindex){
flag = 1;
num = parseInt(span.item(gindex-1).innerHTML);
if(checkcookie(gindex) == true){
num = num + 1;
senddata(gindex);
}else{
alert("你已經點過贊咯！")
}
}
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;
var cookieindex = aindex - 1;
document.getElementsByTagName('span').item(cookieindex).innerHTML = txt;
}
}
xmlhttp.open("GET","/ajax/json/index.php?num=" + num + '&flag=' + flag + '&aindex=' + aindex,true);
xmlhttp.send();
}
/pic/p>
function checkcookie(gindex){
var thiscookie = 'sdcity_foodmap_goodplus' + gindex;
var mapcookie = getCookie(thiscookie)
if (mapcookie!=null && mapcookie!=""){
return false;
}else {
setCookie(thiscookie,thiscookie,365);
return true;
}
}
/pic/p>
function getCookie(c_name){
/pic/p>
if (document.cookie.length > 0){
/pic/p>
c_start = document.cookie.indexOf(c_name + "=");
if (c_start != -1){
/pic/p>
c_start = c_start + c_name.length + 1 ;
/pic/p>
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));/pic/p>
}
}
return "";
}
/pic/p>
function setCookie(c_name,value,expiredays){
/pic/p>
var exdate=new Date();
exdate.setDate( exdate.getDate() + expiredays )
document.cookie = c_name + "=" + escape(value) + ((expiredays==null) ? "" : "; expires=" + exdate.toGMTString())
}
</script>
</body>
</html>
希望本文所述對大家的php程序設計有所幫助。
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