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PHP+jQuery+MySql实现红蓝投票功能

Jun 08, 2016 pm 05:20 PM
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我们经常会碰到一些投票程序了,今天小编整理了一个简单的红蓝投票功能的实现程序了,有需要了解这种投票的朋友进入来看看吧.

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本文是一篇综合知识应用类文章,需要您具备PHP、jQuery、MySQL以及html和css方面的基本知识。本文在《PHP+MySql+jQuery实现的“顶”和“踩”投票功能》一文基础上做了适当改进,共用了数据表,您可以先点击了解这篇文章。

HTML

我们需要在页面中展示红蓝双方的观点,以及对应的投票数和比例,以及用于投票交互的手型图片,本例以#red和#blue分别表示红蓝双方。.redhand和.bluehand用来做手型投票按钮,.redbar和.bluebar展示红蓝双方比例调,#red_num和#blue_num展示双方投票数。
 


   
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CSS

使用CSS将页面美化,加载背景图片,确定相对位置等等,你可以直接复制以下代码,在自己的项目中稍作修改即可。
 
.vote{width:288px; height:220px; margin:60px auto 20px auto;position:relative}
.votetitle{width:100%;height:62px; background:url(icon.png) no-repeat 0 30px; font-size:15px}
.red{position:absolute; left:0; top:90px; height:80px;}
.blue{position:absolute; right:0; top:90px; height:80px;}
.votetxt{line-height:24px}
.votetxt span{float:right}
.redhand{position:absolute; left:0;width:36px; height:36px; background:url(icon.png) no-repeat -1px -38px;cursor:pointer}
.bluehand{position:absolute; right:0;width:36px; height:36px; background:url(icon.png) no-repeat -41px -38px;cursor:pointer}
.grayhand{width:34px; height:34px; background:url(icon.png) no-repeat -83px -38px;cursor:pointer}
.redbar{position:absolute; left:42px; margin-top:8px;}
.bluebar{position:absolute; right:42px; margin-top:8px; }
.redbar span{display:block; height:6px; background:red; width:100%;border-radius:4px;}
.bluebar span{display:block; height:6px; background:#09f; width:100%;border-radius:4px; position:absolute; right:0}
.redbar p{line-height:20px; color:red;}
.bluebar p{line-height:20px; color:#09f; text-align:right; margin-top:6px}

jQuery

当点击手型按钮时,利用jQuery的$.getJSON()向后台php发送Ajax请求,如果请求成功,将会得到后台返回的json数据,jQuery再将json数据进行处理。以下函数:getdata(url,sid),传递了两个参数,url是请求的后台php地址,sid表示当前投票主题ID,我们在该函数中,返回的json数据有红蓝双方的投票数,以及双方比例,根据比例计算比例条的宽度,异步交互展示投票效果。
 
function getdata(url,sid){
    $.getJSON(url,{id:sid},function(data){
        if(data.success==1){
            var w = 208; //定义比例条的总宽度
            //红方投票数
            $("#red_num").html(data.red);
            $("#red").css("width",data.red_percent*100+"%");
            var red_bar_w = w*data.red_percent-10;
            //红方比例条宽度
            $("#red_bar").css("width",red_bar_w);
            //蓝方投票数
            $("#blue_num").html(data.blue);
            $("#blue").css("width",data.blue_percent*100+"%");
            var blue_bar_w = w*data.blue_percent;
            //蓝方比例条宽度
            $("#blue_bar").css("width",blue_bar_w);
        }else{
            alert(data.msg);
        }
    });
}

当页面初次加载时,即调用getdata(),然后点击给红方投票或给蓝方投票同样调用getdata(),只是传递的参数不一样。注意本例中的参数sid我们设置为1,是根据数据表中的id设定的,开发者可以根据实际项目读取准确的id。
 
$(function(){
    //获取初始数据
    getdata("vote.php",1);
    //红方投票
    $(".redhand").click(function(){
        getdata("vote.php?action=red",1);
    });
    //蓝方投票
    $(".bluehand").click(function(){
        getdata("vote.php?action=blue",1);
    });
});

PHP

前端请求了后台的vote.php,vote.php将根据接收的参数,连接数据库,调用相关函数。
 
include_once("connect.php");
 
$action = $_GET['action'];
$id = intval($_GET['id']);
$ip = get_client_ip();//获取ip
 
if($action=='red'){//红方投票
    vote(1,$id,$ip);
}elseif($action=='blue'){//蓝方投票
    vote(0,$id,$ip);
}else{//默认返回初始数据
    echo jsons($id);
}

函数vote($type,$id,$ip)用来做出投票动作,$type表示投票方,$id表示投票主题的id,$ip表示用户当前ip。首先根据用户当前IP,查询投票记录表votes_ip中是否已经存在当前ip记录,如果存在,则说明用户已投票,否则更新红方或蓝方的投票数,并将当前用户投票记录写入到votes_ip表中以防重复投票。
 
function vote($type,$id,$ip){
    $ip_sql=mysql_query("select ip from votes_ip where vid='$id' and ip='$ip'");
    $count=mysql_num_rows($ip_sql);
    if($count==0){//还没有投票
        if($type==1){//红方
            $sql = "update votes set likes=likes+1 where id=".$id;
        }else{//蓝方
            $sql = "update votes set unlikes=unlikes+1 where id=".$id;
        }
        mysql_query($sql);
        
        $sql_in = "insert into votes_ip (vid,ip) values ('$id','$ip')";
        mysql_query($sql_in);
        if(mysql_insert_id()>0){
            echo jsons($id);
        }else{
            $arr['success'] = 0;
            $arr['msg'] = '操作失败,请重试';
            echo json_encode($arr);
        }
    }else{
        $arr['success'] = 0;
        $arr['msg'] = '已经投票过了';
        echo json_encode($arr);
    }
}
函数jsons($id)通过查询当前id的投票数,计算比例并返回json数据格式供前端调用。
 
function jsons($id){
    $query = mysql_query("select * from votes where id=".$id);
    $row = mysql_fetch_array($query);
    $red = $row['likes'];
    $blue = $row['unlikes'];
    $arr['success']=1;
    $arr['red'] = $red;
    $arr['blue'] = $blue;
    $red_percent = round($red/($red+$blue),3);
    $arr['red_percent'] = $red_percent;
    $arr['blue_percent'] = 1-$red_percent;
    
    return json_encode($arr);
}

文中还涉及到获取用户真实IP的函数:get_client_ip(),点击这里可以看相关代码:

//获取用户真实IP
function getIp() {
    if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
        $ip = getenv("HTTP_CLIENT_IP");
    else
        if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
            $ip = getenv("HTTP_X_FORWARDED_FOR");
        else
            if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
                $ip = getenv("REMOTE_ADDR");
            else
                if (isset ($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
                    $ip = $_SERVER['REMOTE_ADDR'];
                else
                    $ip = "unknown";
    return ($ip);
}


最后,贴上Mysql数据表,votes表用来记录红蓝双方的投票总数,votes_ip表则用来存放用户的投票IP记录。

CREATE TABLE IF NOT EXISTS `votes` (
  `id` int(10) NOT NULL AUTO_INCREMENT,
  `likes` int(10) NOT NULL DEFAULT '0',
  `unlikes` int(10) NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8;
 
 
INSERT INTO `votes` (`id`, `likes`, `unlikes`) VALUES
(1, 30, 10);
 
CREATE TABLE IF NOT EXISTS `votes_ip` (
  `id` int(10) NOT NULL,
  `vid` int(10) NOT NULL,
  `ip` varchar(40) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8;


再次提醒,下载的demo如果运行不了,请先检查数据库连接配置是否正确

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