Question

在chartjs中，一旦点击了图例中的任何一个，它就会显示文本并隐藏特定数据的详细信息。而不是打击那个文本我需要把它作为灰色或其他一些好的选择。

Answer 1

使用custom HTML legend，您可以根据需要自定义其行为。

下面是一个例子：

O(m*n(log m + (m-log m)*o*p))=O(m^2*n*o*p)

var ctx = document.getElementById("myChart").getContext('2d');

var chartData = [60, 90, 120, 150];
var chartLabels = ['apples','bananas','oranges','pears'];

var chart = new Chart(ctx, {
  type: 'pie',
  data: {
    labels: chartLabels,
    datasets: [{
      backgroundColor: [
        "#f43004",
        "#decf3f",
        "#FFA500",
        "#9b59b6",
      ],
      data: chartData
    }]
  },
  options: {
    legend: {
      display: false
    },
    legendCallback: function(chart) {
      var text = [];
      text.push('<ul class="0-legend">');
      var ds = chart.data.datasets[0];
      var sum = ds.data.reduce(function add(a, b) { return a + b; }, 0);
      for (var i=0; i<ds.data.length; i++) {
        text.push('<li>');
        var perc = Math.round(100*ds.data[i]/sum,0);
        text.push('<span style="background-color:' + ds.backgroundColor[i] + '">' + '</span>' + chart.data.labels[i] + ' ('+ds.data[i]+') ('+perc+'%)');
        text.push('</li>');
      }
      text.push('</ul>');
      return text.join("");
    }
  }
});

var myLegendContainer = document.getElementById("legend");
// generate HTML legend
myLegendContainer.innerHTML = chart.generateLegend();
// bind onClick event to all LI-tags of the legend
var legendItems = myLegendContainer.getElementsByTagName('li');
for (var i = 0; i < legendItems.length; i += 1) {
  legendItems[i].addEventListener("click", legendClickCallback, false);
}

function legendClickCallback(event) {
  event = event || window.event;

  var target = event.target || event.srcElement;
  while (target.nodeName !== 'LI') {
    target = target.parentElement;
  }
  var parent = target.parentElement;
  var chartId = parseInt(parent.classList[0].split("-")[0], 10);
  var chart = Chart.instances[chartId];
  var index = Array.prototype.slice.call(parent.children).indexOf(target);
  var meta = chart.getDatasetMeta(0);
  console.log(index);
	var item = meta.data[index];

  if (item.hidden === null || item.hidden === false) {
    item.hidden = true;
    target.classList.add('hidden');
  } else {
    target.classList.remove('hidden');
    item.hidden = null;
  }
  chart.update();
}

body {
    font-family: 'Arial';
}

.container { 
  margin: 15px auto;
}

#chart {
  float: left;
  width: 70%;
}

#legend {
  float: right;
}

[class$="-legend"] {
  list-style: none;
  cursor: pointer;
  padding-left: 0;
}

[class$="-legend"] li {
  display: block;
  padding: 0 5px;
}

[class$="-legend"] li.hidden {
  color: #aaaaaa;
}

[class$="-legend"] li span {
  border-radius: 5px;
  display: inline-block;
  height: 10px;
  margin-right: 10px;
  width: 10px;
}

Chartjs删除了传说中的文字

1 个答案: