PHP+Ajax implements article mood voting function (code example)

An example of PHP Ajax implementing the article mood voting function, you can learn and understand the basic process of voting: obtain mood icons and histogram related data through ajax, when the user clicks one of the mood icons When sending a request to Ajax.php, PHP verifies the user cookie to prevent repeated submission, and then adds 1 to the corresponding data mood field content in mysql. After success, it returns to the front-end page and updates the histogram and statistical data.

Post a mood:

$id = (int)$_POST['id']; //文章或帖子id  
$mid = (int)$_POST['moodid']; //心情id（配置文件中提供8种心情）  
if(!$mid || !$id){  
    echo "此链接不存在";exit;  
}  
  
$havemood = chk_mood($id); //验证cookie  
if($havemood==1){  
    echo "您已经表达过心情了，保持平常心有益身心健康！";exit;  
}  
$field = 'mood'.$mid; //数据表中的心情字段，分别用mood0，mood1，mood2...表示不同的心情字段  
$query = mysql_query("update mood set ".$field."=".$field."+1 where id=".$id); //对应的心情字段值+1  
if($query){  
    setcookie("mood".$id, $mid.$id, time()+300); //设置cookie，为了测试我们设置cookie过期时间为300s  
    $query2 = mysql_query("select * from mood where id=$id");  
    $rs = mysql_fetch_array($query2);//获取该文章的心情数据  
    $total = $rs['mood0']+$rs['mood1']+$rs['mood2']+$rs['mood3']+$rs['mood4']+$rs['mood5']+  
$rs['mood6']+$rs['mood7'];  
    $height = round(($rs[$field]/$total)*$moodpicheight); //得到总量，并计算当前对应心情的柱状图的高度  
    echo $height; //返回当前心情柱状的高度  
}else{  
    echo -1; //数据出错  
}

Get a mood:

$mname = explode(',',$moodname);//心情说明  
$num = count($mname);  
$mpic = explode(',',$moodpic);//心情图标  
  
$id = (int)$_GET['id']; //文章或帖子id  
$query = mysql_query("select * from mood where id=$id"); //查询对应的心情数据  
$rs = mysql_fetch_array($query);  
if($rs){  
    //得到发表心情的总量  
    $total = $rs['mood0']+$rs['mood1']+$rs['mood2']+$rs['mood3']+$rs['mood4']+  
$rs['mood5']+$rs['mood6']+$rs['mood7'];  
    for($i=0;$i<$num;$i++){  
        $field = &#39;mood&#39;.$i; //字段名  
        $m_val = intval($rs[$field]); //心情对应的值（次数）  
        $height = 0; //柱图高度  
        if($total && $m_val){  
            $height=round(($m_val/$total)*$moodpicheight); //计算高度  
        }  
              
        $arr[] = array(  
            &#39;mid&#39; => $i, //对应心情id  
            &#39;mood_name&#39; => $mname[$i], //心情名称  
            &#39;mood_pic&#39; => $mpic[$i], //图标  
            &#39;mood_val&#39; => $m_val, //次数  
            &#39;height&#39; => $height //柱状图高度  
        );  
    }  
    echo json_encode($arr); //返回JSON数据  
}

Get mood list information and display it on the page:

$(function(){  
    $.ajax({  
        type: 'GET', //通过get方式发送请求  
        url: 'ajax.php', //目标地址  
        cache: false, //不缓存数据，注意文明发表心情的数据是实时的，需将cache设置为false，默认是true  
        data: 'id=1', //参数，对应文章或帖子的id，本例中固定为1，实际应用中是获取当前文章或帖子的id  
        dataType: 'json', //数据类型为json  
        error: function(){  
            alert('出错了！');  
        },  
        success: function(json){ //请求成功后  
            if(json){  
                $.each(json,function(index,array){ //遍历json数据列  
                    var str = "<li><span>"+array[&#39;mood_val&#39;]+"</span><div class=\"pillar\"   
style=\"height:"+array[&#39;height&#39;]+"px;\"></div><div class=\"face\"   
rel=\""+array[&#39;mid&#39;]+"\"><img  src=\"images/"+array[&#39;mood_pic&#39;]+"\" alt="PHP+Ajax implements article mood voting function (code example)" >  
<br/>"+array[&#39;mood_name&#39;]+"</div></li>";  
                    $("#mood ul").append(str); //将数据加入到#mood ul列表中  
                   });   
            }  
        }  
    });  
    ...  
});

To create a database table, run the following code directly:

CREATE TABLE IF NOT EXISTS `mood` (  
  `id` int(11) NOT NULL,  
  `mood0` int(11) NOT NULL DEFAULT '0',  
  `mood1` int(11) NOT NULL DEFAULT '0',  
  `mood2` int(11) NOT NULL DEFAULT '0',  
  `mood3` int(11) NOT NULL DEFAULT '0',  
  `mood4` int(11) NOT NULL DEFAULT '0',  
  `mood5` int(11) NOT NULL DEFAULT '0',  
  `mood6` int(11) NOT NULL DEFAULT '0',  
  `mood7` int(11) NOT NULL DEFAULT '0',  
  PRIMARY KEY (`id`)  
) ENGINE=MyISAM DEFAULT CHARSET=utf8;  
  
  
INSERT INTO `mood` (`id`, `mood0`, `mood1`, `mood2`, `mood3`, `mood4`, `mood5`, `mood6`, `mood7`)  
VALUES(1, 8, 6, 20, 16, 6, 9, 15, 21);

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