jQuery制作简单柱状图实例

2019-11-20 13:18:39

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本文实例讲述了jQuery制作简单柱状图的方法。分享给大家供大家参考。具体实现方法如下：

Html部分：

<head>  
<title>柱状图</title>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
<link href="css.css" type="text/css" rel="stylesheet" />  
<script src="jquery-1.8.2.min.js" type="text/javascript"></script>  
<script src="histogram.js" type="text/javascript"></script>  
</head>  
<body>  
<div class="histogram-container" id="histogram-container"></div>  
</body>

CSS部分：

复制代码代码如下:

/*以下为柱状图样式*/  
.histogram-container{position:relative;margin-left:60px;margin-top:10px;margin-bottom:25px;}  
.histogram-bg-line{border:#999 solid;border-width:0 0px 1px 1px;border-right-color:#eee;overflow:hidden;width:99%;}  
.histogram-bg-line ul{overflow:hidden;border:#eee solid;border-width:1px 0 0 0;clear:both;}  
.histogram-bg-line li{float:left;overflow:hidden;background:#fff;}  
.histogram-bg-line li div{border-right:1px #eee solid;}  
.histogram-content{position:absolute;left:0px;top:0;width:99%;height:100%;}  
.histogram-content ul{height:100%;}  
.histogram-content li{float:left;height:100%;text-align:center;position:relative;}  
.histogram-box{position:relative;display:inline-block;height:100%;width:20px;}  
.histogram-content li a{position:absolute;bottom:0;right:0;display:block;width:20px;font-size:0;line-height:0;}  
.histogram-content li .histogram-name{position:absolute;bottom:-20px;left:0px;white-space:nowrap;display:inline-block;width:100%;font-size:12px;overflow:hidden;}  
.histogram-y{position:absolute;left:-60px;top:-10px;font:12px/1.8 verdana,arial;}  
.histogram-y li{text-align:right;width:55px;padding-right:5px;color:#333;}  
.histogram-bg-line li div,.histogram-y li{height:30px;/*控制单元格的高度及百分比的高度，使百分数与线条对其*/}

Js部分：

复制代码代码如下:

$(function(){  
var dataArr={  
    "data":[  
        {"id":1,"name":"百度","per":"10"},  
        {"id":2,"name":"腾讯","per":"20"},  
        {"id":3,"name":"新浪","per":"10"},  
        {"id":4,"name":"网易","per":"44"},  
        {"id":5,"name":"搜狐","per":"50"},  
        {"id":5,"name":"小虾虎鱼","per":"69"},  
        {"id":5,"name":"人人网","per":"72"},  
        {"id":5,"name":"爱奇艺","per":"88"},  
        {"id":5,"name":"奇虎360","per":"92"},  
        {"id":5,"name":"阿里巴巴","per":"15"},  
        {"id":5,"name":"阿里巴巴","per":"10"}  
    ]  
};  
new histogram().init(dataArr.data);  
});  
  
function histogram(){  
    var controls={};  
    var bgColor=new Array("#666666","#21AA7C","#2277BB","#dc7644","#BBAA22","#AA22AA","#338800","#1099EE","#ffcc33","#ED3810");  
    this.init=function(data,y){  
        setControls();  
        buildHtml(data,y);  
    }  
    function setControls(){  
        controls.histogramContainer=$("#histogram-container");  
        controls.histogramBgLineUL=controls.histogramContainer.children("div.histogram-bg-line");  
        controls.histogramContentUL=controls.histogramContainer.children("div.histogram-content");  
        controls.histogramY=controls.histogramContainer.children("div.histogram-y");  
    }  
    function buildHtml(data,y){  
        var len=data.length,perArr=new Array(),maxNum,maxTotal,yStr='';  
        var contentStr='',bgLineStr='',bgLineAll='';  
        var widthPer=Math.floor(100/len);  
        minWidth=len*21+60;  
        controls.histogramContainer.css("min-width",minWidth+"px");  
          
        for(var a=0;a<len;a++){  
            perArr[a]=parseInt(data[a]['per']);       
        }  
        maxNum=String(perArr.max());  
        if(maxNum.length>2){  
            var x=parseInt(maxNum.substr(maxNum.length-2,1))+1;  
            maxTotal=Math.floor(parseInt(maxNum/100))*100+x*10;  
        }else{  
            maxTotal=Math.floor(parseInt(maxNum/10))*10+10;  
        }  
          
        //y轴部分  
        if(y=="%"){  
            yStr+='<li>100%</li><li>80%</li><li>60%</li><li>40%</li><li>20%</li><li>0%</li>';             
        }else{  
            var avg=maxTotal/5;  
            for(i=5;i>=0;i--){  
                yStr+='<li>'+avg*i+'</li>';  
            }  
        }  
          
        //柱状条部分  
        for(var i=0;i<len;i++){  
            var per=Math.floor(parseInt(data[i]['per'])/maxTotal*100);  
            var n=Math.floor(parseInt(per)/10);  
            contentStr+='<li style="width:'+widthPer+'%">';  
            contentStr+='<span class="histogram-box"><a style="height:'+per+'%'+';background:'+bgColor[n]+';" title="'+data[i]['per']+'"></a></span><span class="histogram-name">'+data[i]['name']+'</span>';  
            contentStr+='</li>';  
            bgLineStr+='<li style="width:'+widthPer+'%;"><div></div></li>';  
        }  
          
        //背景方格部分  
        for(var j=0;j<5;j++){  
            bgLineAll+='<ul>'+bgLineStr+'</ul>';  
        }  
        bgLineAll='<div class="histogram-bg-line">'+bgLineAll+'</div>';  
        contentStr='<div class="histogram-content"><ul>'+contentStr+'</ul></div>';  
        yStr='<div class="histogram-y"><ul>'+yStr+'</ul></div>';  
        controls.histogramContainer.html(bgLineAll+contentStr+yStr);  
        controls.histogramContainer.css("height",controls.histogramContainer.height()+"px");//主要是解决IE6中的问题        
    }  
}  
Array.prototype.max = function(){//最大值  
 return Math.max.apply({},this)   
}