记一次echarts的mouseout事件多次触发导致的定时器异常执行问题

页面上有一个 echarts 折线和柱形图，已有程序定时显示 tooltip，现需要开发后续功能，点击折线图和柱形图时打开新的遮罩弹出层，然后 bug 就出现了，多次打开弹出层后，原有的定时显示 tooltip 的定时器乱了。

原代码如下：

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <link href="./plugins/bootstrap-5.1.3-dist/css/bootstrap.min.css" rel="stylesheet" />
    <script src="./plugins/echarts.min.js"></script>
    <script src="./plugins/jquery/jquery-3.3.1.js"></script>
    <script src="./plugins/bootstrap-5.1.3-dist/js/bootstrap.bundle.min.js"></script>
  </head>
  <body>
    <div id="main" style="height: 300px"></div>
  
    <div id="myModal" class="modal" tabindex="-1">
      <div class="modal-dialog modal-dialog-centered modal-lg">
        <div class="modal-content p-2 pt-4" style="height: 550px"></div>
      </div>
    </div>
  </body>

  <script>
    const myModal = new bootstrap.Modal(document.getElementById("myModal"));
  </script>

  <script>
    var chartDom = document.getElementById("main");
    var myChart = echarts.init(chartDom);
    var option;

    option = {
      tooltip: {
        trigger: "axis",
        axisPointer: {
          type: "cross",
        },
        formatter: function (param) {
          let str = "";
          str += '<span style="font-weight:bold;"><?php //echo date("m-d", strtotime($date)); ?>' + param[0].name + "</span><br/>";
          str += param[0].marker + param[0].seriesName + ' : <span style="float:right;font-weight:bold;margin-left:20px;">' + param[0].value + " pcs</span><br/>";
          str += param[1].marker + param[1].seriesName + ' : <span style="float:right;font-weight:bold;margin-left:20px;">' + param[1].value + " pcs</span><br/>";
          return str;
        },
      },
      xAxis: {
        type: "category",
        data: ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"],
      },
      yAxis: {
        type: "value",
      },
      series: [
        {
          name: "s1",
          data: [120, 200, 150, 80, 70, 110, 130],
          type: "bar",
        },
        {
          name: "s2",
          data: [150, 230, 224, 218, 135, 147, 260],
          type: "line",
        },
      ],
    };

    option && myChart.setOption(option);
    myChart.on("click", function (params) {
      if (params.componentType === "series") {
        if (params.seriesType === "line" && params.seriesIndex === 1) {
          myModal.show();
          console.log(new Date());
        } else if (params.seriesType === "bar" && params.seriesIndex === 0) {
          myModal.show();
          console.log(new Date());
        }
      }
    });

    function func() {
      var dataLen = option.series[0].data.length;
      currentIndex = (currentIndex + 1) % dataLen;
      // 显示 tooltip
      myChart.dispatchAction({
        type: "showTip",
        seriesIndex: 0,
        dataIndex: currentIndex,
      });

      console.log(new Date());
    }

    let currentIndex = -1;
    var timer = setInterval(func, 2000);

    myChart.on("mouseover", function () {
      clearInterval(timer);
      console.log("mouseover");
    });

    myChart.on("mouseout", function () {
      timer = setInterval(func, 2000);
      console.log("mouseout");
    });
  </script>
</html>

原来效果：tooltip 隔 2s 自动弹出<

多次点击柱形图或者折线图打开遮罩弹出层后

发现定时器执行乱了，mouseout 事件触发了多次导致多个同时器同时运行，考虑 mouseout 事件重设定时器之前先清除定时器，看能不能解决问题：

myChart.on("mouseout", function () {
  clearInterval(timer);
  timer = setInterval(func, 2000);
  console.log("mouseout");
});

多次打开遮罩弹出层后，定时器正常执行，问题解决。由下图可以看出 mouseout 事件触发了多次导致多个同时器同时运行。因此在设定新的定时器之前，先清除之前的定时器可以解决问题。

posted @ 2023-02-24 10:51  carol2014  阅读(648)  评论(0)    收藏  举报