在mouseenter generateLegend Chartjs 2上突出显示圆环段

时间:2017-09-06 09:39:17

标签: javascript charts chart.js chartjs-2.6.0

正如标题所说,我正在尝试根据图例( on mouseenter event )突出显示图表中的细分。我使用 generateLegend 来创建我的自定义图例,但我不确定如何将mouseenter事件附加到每个项目。

这是我到目前为止link

top

对代码的任何提示或帮助都会很棒,我花了好几个小时但没有成功,而且文档对此并不是很清楚。

2 个答案:

答案 0 :(得分:2)

当悬停在自定义图例项目上时,您可以使用以下功能突出显示圆环图的相应片段:

function highlightSegment(chart, index, isHighlight) {
   var activeSegment = chart.getDatasetMeta(0).data[index];
   if (isHighlight) chart.updateHoverStyle([activeSegment], null, true);
   else chart.updateHoverStyle([activeSegment], null, false);
   chart.draw();
}

但是,首先需要将两个事件监听器(mouseenter和mouseleave)附加到每个li (图例)元素/项目中,然后调用上面的函数,传递chart-instance,legend-item-index和布尔值(是否添加/删除突出显示),分别作为第一个,第二个和第三个参数。

ᴡᴏʀᴋɪɴɢ ᴇxᴀᴍᴘʟᴇ



var outerCircle = new Chart(document.getElementById("outer-circle"), {
   "type": "doughnut",
   "data": {
      "labels": ["Beer", "Wine", "Pisco", "Vodka", "Rum", "Tequila"],
      "datasets": [{
         "label": "Drinks",
         "data": [
            30,
            20,
            5,
            15,
            15,
            15
         ],
         "backgroundColor": [
            "#fdc694",
            "#ad937c",
            "#d8c2ae",
            "#bab8b6",
            "#e5aa74",
            "#fcf0e5"
         ]
      }]
   },
   "options": {
      "legend": {
         "display": false
      },
      "tooltips": {
         "mode": 'label',
         "callbacks": {
            "label": function(tooltipItem, data) {
               return " " + data['labels'][tooltipItem['index']] + " " + data['datasets'][0]['data'][tooltipItem['index']] + '%';
            }
         }
      }
   }
});

var diagramLegend = document.getElementById('diagram-legend');

diagramLegend.innerHTML = outerCircle.generateLegend();

/*** Highlight Doughnut Segment on Legend Hover ***/

var legendItems = document.querySelectorAll('#diagram-legend li');

legendItems.forEach(function(item, itemIndex) {
   item.addEventListener('mouseenter', function() {
      highlightSegment(outerCircle, itemIndex, true);
   });
   item.addEventListener('mouseleave', function() {
      highlightSegment(outerCircle, itemIndex, false);
   });
});

function highlightSegment(chart, index, isHighlight) {
   var activeSegment = chart.getDatasetMeta(0).data[index];
   if (isHighlight) chart.updateHoverStyle([activeSegment], null, true);
   else chart.updateHoverStyle([activeSegment], null, false);
   chart.draw();
}

#pie-wrapper {
   width: 300px;
   height: 300px;
}

#diagram-legend ul {
   list-style: none;
   padding: 0;
   margin: 0;
}

#diagram-legend ul li {
   margin-bottom: 10px;
}

#diagram-legend ul li span {
   width: 15px;
   height: 15px;
   display: inline-block;
   vertical-align: sub;
   margin-right: 10px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.6.0/Chart.min.js"></script>
<div id="pie-wrapper">
   <canvas id="outer-circle" width="300" height="300"></canvas>
</div>
<div id="diagram-legend"></div>
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答案 1 :(得分:0)

    color: [
      {
        backgroundColor: ['#92d06f', '#73c8b8', '#3bb9ab'],
        borderColor: 'rgba(255, 255, 255, 0)',
        hoverBackgroundColor: ['#92d06f', '#73c8b8', '#3bb9ab'],
        hoverBorderColor: ['#92d06f', '#73c8b8', '#3bb9ab'],
        hoverBorderWidth: 10,
        hoverRadius: 0
      }
   ],

它在鼠标输入上正常工作突出显示角度2(ng2图表)中的活动段,用于圆环图