Question

我正在使用Chartjs v.1.0.2并试图设置一个点点，只显示在鼠标悬停在图表上方。之后它应该被删除。我已设法通过更改对象值来显示它，但它不是流体运动，并且它不会始终显示点。这也不会在悬停时隐藏它。当鼠标没有结束时，它怎么能流动和隐藏？

window.onload = function(){

        var ctx = $("#chart1").get(0).getContext("2d");
                var chart1 = new Chart(ctx).Line(data1, options);


                $("#chart1").hover(function(e) {
                    var activeBars = chart1.getPointsAtEvent(e); 
                    activeBars[0].display = true;
//                    console.log(activeBars[0]);
                    chart1.update();
                 });

    };

    var data1 = {
            labels: ["January", "February", "March", "April", "May", "June", "July"],
            datasets: [
                {
                    label: "My First dataset",
                    fillColor: "rgba(95,186,88,0.7)",
                    strokeColor: "rgba(95,186,88,1)",
                    pointColor: "rgba(95,186,88,1)",
                    pointStrokeColor: "#fff",
                    pointHighlightFill: "#fff",
                    pointHighlightStroke: "rgba(220,220,220,1)",
                    data: [65, 59, 80, 81, 56, 55, 40]
                }
            ]
    };



var options = {
    responsive: true,
    bezierCurve : false,
    scaleShowLabels: false,
    scaleFontSize: 0,
    pointDot : false,
    scaleBeginAtZero: true,
    scaleShowHorizontalLines: false,
    scaleShowVerticalLines: true,
    scaleGridLineColor : "rgba(232,232,232)",
    showTooltips: true,

    customTooltips: function (tooltip) {
        var tooltipEl = $('#chartjs-tooltip');

        if (!tooltip) {
            tooltipEl.css({
                opacity: 0
            });
            return;
        }

        tooltipEl.removeClass('above below');
        tooltipEl.addClass(tooltip.yAlign);

        // split out the label and value and make your own tooltip here
        var parts = tooltip.text.split(":");
        var innerHtml = '<span>' + parts[0].trim() + '</span> : <span><b>' + parts[1].trim() + '</b></span>';
        tooltipEl.html(innerHtml);

        tooltipEl.css({
            opacity: 1,
            left: tooltip.chart.canvas.offsetLeft + tooltip.x + 'px',
            top: tooltip.chart.canvas.offsetTop + tooltip.y + 'px',
            fontFamily: tooltip.fontFamily,
            fontSize: tooltip.fontSize,
            fontStyle: tooltip.fontStyle,
        });
    }

};

简化fiddle

Answer 1

我在前一段时间遇到了类似的情况并通过使默认点“不可见”解决了这个问题，如下所示：

将 pointDotRadius 设置为1
将 pointStrokeColor 设置为白色，并将alpha设置为0

上述两个步骤使默认点点非常小，这与透明点笔划相结合，使默认点点不可见。现在，如果我们使 pointDotStrokeWidth 足够大，我们就可以实现所需的悬停效果。即。

将 pointDotStrokeWidth 设置为更大的值（我使用了8）
为 pointColor ， pointHighlightFill ， pointHighlightStroke

[注意：通过 pointColor 可以实现相同的效果透明，但如果你正在绘制多个数据集，那么工具提示不会显示数据旁边的相应线条颜色值。]

下面的示例（或者您可以查看此Fiddle: ChartJS - Show Points on Hover）：

var data = {
  labels: ["Point0", "Point1", "Point2", "Point3", "Point4"],
  datasets: [
    {
      label: "My Chart",
      fillColor: "rgba(87, 167, 134, 0.2)",
      strokeColor: "rgba(87, 167, 134, 1)",
      pointColor: "rgba(87, 167, 134, 1)",
      pointStrokeColor: "rgba(255, 255, 255, 0)",
      pointHighlightFill: "rgba(87, 167, 134, 0.7)",
      pointHighlightStroke: "rgba(87, 167, 134, 1)",
      data: [5, 39, 109, 19, 149]
    }
  ]
};
var ctx = document.getElementById("my_chart").getContext("2d");
myChart = new Chart(ctx).Line(data, {
  responsive : true,
  bezierCurve: false,
  datasetFill: true,
  pointDotRadius: 1,
  pointDotStrokeWidth: 8,
  pointHitDetectionRadius: 20,
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.min.js"></script>
<canvas id="my_chart"></canvas>

Answer 2

$("#chart1").mouseover(function(e) {
    chart1.datasets[0].points[0].display = true;
    chart1.update();
 });
$("#chart1").mouseout(function(e) {
    chart1.datasets[0].points[0].display = false;
    chart1.update();
 });

Answer 3

使用Chart.js v2.6.0进行测试

全局设置可以解决问题：

Chart.defaults.global.hover.intersect = false;

或直接在图表配置中：

options: {
  hover: {
    intersect: false;
  }
}

并为数据集指定设置。

该点的初始颜色应该是透明的
悬停颜色必须设置为所需的颜色

e.g。

datasets: [{
  label: 'My First dataset',
  borderColor: 'rgb(255, 99, 132)',
  backgroundColor: 'rgb(255, 99, 132)',
  data: [10, 30, 46, 2, 8, 50, 0],
  fill: false,
  pointBorderColor: 'rgba(0, 0, 0, 0)',
  pointBackgroundColor: 'rgba(0, 0, 0, 0)',
  pointHoverBackgroundColor: 'rgb(255, 99, 132)',
  pointHoverBorderColor: 'rgb(255, 99, 132)'}],...

window.onload = function() {
  const mode = 'index';
  const intersect = false;
  const config = {
    type: 'line',
    data: {
      labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
      datasets: [{
        label: 'My First dataset',
        borderColor: 'rgb(255, 99, 132)',
        backgroundColor: 'rgb(255, 99, 132)',
        data: [10, 30, 46, 2, 8, 50, 0],
        fill: false,
        pointBorderColor: 'rgba(0, 0, 0, 0)',
        pointBackgroundColor: 'rgba(0, 0, 0, 0)',
        pointHoverBackgroundColor: 'rgb(255, 99, 132)',
        pointHoverBorderColor: 'rgb(255, 99, 132)',
      }, {
        label: 'My Second dataset',
        borderColor: 'rgb(54, 162, 235)',
        backgroundColor: 'rgb(54, 162, 235)',
        data: [7, 49, 46, 13, 25, 30, 22],
        fill: false,
        pointBorderColor: 'rgba(0, 0, 0, 0)',
        pointBackgroundColor: 'rgba(0, 0, 0, 0)',
        pointHoverBackgroundColor: 'rgb(54, 162, 235)',
        pointHoverBorderColor: 'rgb(54, 162, 235)',
      }]
    },
    options: {
      responsive: true,
      title: {
        display: true,
        text: 'Mode: index, intersect = false'
      },
      tooltips: {
        mode: 'index',
        intersect: intersect,
      },
      hover: {
        mode: mode,
        intersect: intersect
      },
    }
  };
  const ctx = document.getElementById('canvas').getContext('2d');
  const chart = new Chart(ctx, config);
}

<canvas id="canvas"></canvas>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>

Answer 4

尝试使用mouseover和mouseout，如下所示。同样，您也可以使用mouseenter和mouseleave方法来处理事件。

$("#chart1").mouseover(function(e) {
                var activeBars = chart1.getPointsAtEvent(e); 
                activeBars[0].display = true;
                chart1.update();
             });

$("#chart1").mouseout(function(e) {
                var activeBars = chart1.getPointsAtEvent(e); 
                activeBars[0].display = false;
                chart1.update();
             });

chartjs将鼠标悬停在折线图

4 个答案: