jquery.flot.js简单绘制折线图用法示例

zhouwen

2017-03-13

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：

jquery.flot.js简单绘制折线图用法示例