本文实例讲述了jquery.flot.js简单绘制折线图用法。分享给大家供大家参考，具体如下：
1、完整实例代码：
<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
<title>折线图</title>
<!--[if lte IE 8]>
<script language="javascript" type="text/javascript" src="js/excanvas.min.js"></script>
<![endif]-->
<script language="javascript" type="text/javascript" src="js/jquery.js"></script>
<script language="javascript" type="text/javascript" src="js/jquery.flot.js"></script>
<script type="text/javascript">
$(function() {
AlPriceQuery();
});
function AlPriceQuery(){
var result = {
AvgPrice : [14030, 13980, 14060, 14000, 13930, 14030, 13980, 14060, 14000, 13930],
Date: ["11-1", "11-2", "11-3", "11-4", "11-5", "11-6", "11-7", "11-8", "11-9", "11-10"],
}
var DataArr = [];//y轴数据
var TickArr = [];//x轴自定义刻度数据
var PriceArr = [];//价格
for(var i=0; i<result.Date.length; i++){
DataArr.push([ i+1, result.AvgPrice[i] ]);
TickArr.push([ i+1, result.Date[i] ]);
PriceArr.push(result.AvgPrice[i]);
}
var MinPrice = PriceArr.sort(function(a, b){return a - b})[0];//获取最小的铝锭价
if(MinPrice % 20 == 0){
MinPrice = MinPrice - 20;
}
else{
MinPrice = MinPrice - 30;
}
//数据源
var DataSet = [{
"label": "最近 " + result.Date.length + " 日铝锭价",
"data": DataArr,//折线图数据
}];
//配置
var Options = {
xaxis: {
ticks: TickArr,//x轴自定义刻度数据
},
yaxis: {
min: MinPrice,//最小刻度
tickSize: 20,//递增量
},
series: {
lines: {
show: true,//显示线段
lineWidth: 1.5,
},
points: {
show: true,//显示节点
radius: 3,
},
color: "#7AC0DA",
},
grid: {
hoverable: true,//鼠标移动到节点会有效果
borderWidth: 1,//最外边的边框
backgroundColor: { colors: ["#ffffff", "#EDF5FF"] },
},
legend: {
noColumns: 0,
labelBoxBorderColor: "#000000",
position: "sw",
backgroundOpacity: 0.1,
},
shadowSize: 0,//曲线阴影
};
//节点hover事件
$.fn.UseTooltip = function () {
var PrePoint = null, PreLabel = null;
$(this).bind("plothover", function (event, pos, item) {
if (item) {
if ((PreLabel != item.series.label) || (PrePoint != item.dataIndex)) {
PrePoint = item.dataIndex;
PreLabel = item.series.label;
$("#tooltip").remove();
$(this).css({
"cursor": "pointer"
})
if (item.seriesIndex == 0) {
ShowTooltip(
item.pageX + 100,
item.pageY - 10,
"#f7d373",
result.Date[item.dataIndex] + " 铝锭价: " + item.series.data[item.dataIndex][1]);
}
}
}
else {
PrePoint = null;
PreLabel = null;
$(this).css({
"cursor": "auto"
});
$("#tooltip").remove();
}
});
};
if (PriceArr.length > 0) {
$.plot($("#placeholder"), DataSet, Options);
$("#placeholder").UseTooltip();
}
}
//提示框
function ShowTooltip(x, y, color, contents) {
$('<div id="tooltip">' + contents + '</div>').css({
position: 'absolute',
display: 'none',
top: y - 40,
left: x - 120,
border: '2px solid ' + color,
padding: '3px',
'font-size': '9px',
'border-radius': '5px',
'background-color': '#fff',
'font-family': 'Verdana, Arial, Helvetica, Tahoma, sans-serif',
opacity: 0.9
}).appendTo("body").fadeIn(200);
}
</script>
</head>
<body>
<div id="placeholder" style="width:400px;height:200px;"></div>
</body>
</html>
2、运行效果图如下：
附：jquery.flot.js插件本站下载地址：
https://m.qb5200.com/www.qb5200.com/jiaoben/22143.html
希望本文所述对大家jQuery程序设计有所帮助。
