jQuery制作简单柱状图实例教程
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：
代码如下:
<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>
<p class="histogram-container" id="histogram-container"></p>
</body>
css部分：
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 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：
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("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+'%;"><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");//主要是解决ie6中的问题
}
}
array.prototype.max = function(){//最大值
return math.max.apply({},this)
}
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