本文實例講述瞭jQuery制作簡單柱狀圖的方法。分享給大傢供大傢參考。具體實現方法如下：
Html部分：
代碼如下:
<head>
<title>柱狀圖</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>
<p class="histogram-container" id="histogram-container"></p>
</body>
CSS部分：
代碼如下:
/*以下為柱狀圖樣式*/
.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 p{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 p,.histogram-y li{height:30px;/*控制單元格的高度及百分比的高度，使百分數與線條對其*/}
Js部分：
代碼如下:
$(function(){
var dataArr={
"data":[
{"id":1,"name":"百度","per":"10"},
{"id":2,"name":"騰訊","per":"20"},
{"id":3,"name":"新浪","per":"10"},
{"id":4,"name":"網易","per":"44"},
{"id":5,"name":"搜狐","per":"50"},
{"id":5,"name":"小蝦虎魚","per":"69"},
{"id":5,"name":"人人網","per":"72"},
{"id":5,"name":"愛奇藝","per":"88"},
{"id":5,"name":"奇虎360","per":"92"},
{"id":5,"name":"阿裡巴巴","per":"15"},
{"id":5,"name":"阿裡巴巴","per":"10"}
]
};
new histogram().init(dataArr.data);
});
function histogram(){
var controls={};
var bgColor=new Array("#666666","#21AA7C","#2277BB","#dc7644","#BBAA22","#AA22AA","#338800","#1099EE","#ffcc33","#ED3810");
this.init=function(data,y){
setControls();
buildHtml(data,y);
}
function setControls(){
controls.histogramContainer=$("#histogram-container");
controls.histogramBgLineUL=controls.histogramContainer.children("p.histogram-bg-line");
controls.histogramContentUL=controls.histogramContainer.children("p.histogram-content");
controls.histogramY=controls.histogramContainer.children("p.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軸部分
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>';
}
}
//柱狀條部分
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+'%;"><p></p></li>';
}
//背景方格部分
for(var j=0;j<5;j++){
bgLineAll+='<ul>'+bgLineStr+'</ul>';
}
bgLineAll='<p class="histogram-bg-line">'+bgLineAll+'</p>';
contentStr='<p class="histogram-content"><ul>'+contentStr+'</ul></p>';
yStr='<p class="histogram-y"><ul>'+yStr+'</ul></p>';
controls.histogramContainer.html(bgLineAll+contentStr+yStr);
controls.histogramContainer.css("height",controls.histogramContainer.height()+"px");//主要是解決IE6中的問題
}
}
Array.prototype.max = function(){//最大值
return Math.max.apply({},this)
}