Chart.js:千位分隔符和小甜甜圈的中间

Question

我搜索了很多，在工具提示中包含了上千个分隔符。但我想让它工作的地方有文字。我住的地方我们用"分隔千位和"，"为小数。

我没有找到一个简单的方法把标题放在甜甜圈的中间。

这是我的:

Chart.defaults.global.defaultFontColor = '#7792b1';
var ctx = document.getElementById('myChart').getContext('2d');
var dataset = [{
label: 'Volume de Operações',
data: [254000.87, 355000.57],
backgroundColor: ['#4bb8df', '#6290df']
}]
var chart = new Chart(ctx, {
type: 'doughnut',
data: {
labels: ['CALL', 'PUT'],
datasets: dataset
},
options: {
rotation: 1 * Math.PI,
circumference: 1 * Math.PI,
legend: {
display: false
},
cutoutPercentage: 60,
plugins: {
labels: [{
render: 'label',
arc: true,
fontStyle: 'bold',
position: 'outside'
}, {
render: 'percentage',
fontColor: '#ffffff',
precision: 1
}],
},
title: {
display: true,
fontSize: 15,
text: [
dataset.reduce((t, d) => t + d.data.reduce((a, b) => a + b), 0),
'Volume Total'
],
position: 'bottom'
},
tooltips: {
callbacks: {
label: function(tooltipItem, data) {
var dataLabel = data.labels[tooltipItem.index];
var value = ': ' + data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index].toLocaleString();
if (Chart.helpers.isArray(dataLabel)) {
dataLabel = dataLabel.slice();
dataLabel[0] += value;
} else {
dataLabel += value;
}
return dataLabel;
}
}
}
}
});

<canvas id="myChart" style="max-width: 450px"></canvas>
<script src="https://cdn.jsdelivr.net/npm/chart.js@2.8.0"></script>
<script src="https://cdn.jsdelivr.net/gh/emn178/chartjs-plugin-labels/src/chartjs-plugin-labels.js"></script>

简而言之:

• 全局千位分隔符:(.)
• 甜甜圈中间的标题
• 没有标签的工具提示:只有值

Answer 1

要在工具提示中不显示标题，您必须只返回自定义标签回调中的值。所以你的回调会变成这样:

label: function(tooltipItem, data) {
return data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index].toLocaleString();
}

没有内置的方法来获得圆圈中间的标题，你必须为此编写一个自定义插件。

要替换百分比标签中的千号操作符，您必须编写一个自定义渲染。所以代替render: 'percentage'。您将得到如下内容:

// custom render
{
render: function (args) {
// args will be something like:
// { label: 'Label', value: 123, percentage: 50, index: 0, dataset: {...} }
return '$' + args.value;
}
}

你需要做一个逻辑使值转换成百分比仍然

编辑自定义工具提示，这样你就看不到前面的颜色了

Chart.defaults.global.defaultFontColor = '#7792b1';
var ctx = document.getElementById('myChart').getContext('2d');
var dataset = [{
label: 'Volume de Operações',
data: [254000.87, 355000.57],
backgroundColor: ['#4bb8df', '#6290df']
}]
var chart = new Chart(ctx, {
type: 'doughnut',
data: {
labels: ['CALL', 'PUT'],
datasets: dataset
},
options: {
rotation: 1 * Math.PI,
circumference: 1 * Math.PI,
legend: {
display: false
},
cutoutPercentage: 60,
plugins: {
labels: [{
render: 'label',
arc: true,
fontStyle: 'bold',
position: 'outside'
}, {
render: 'percentage',
fontColor: '#ffffff',
precision: 1
}],
},
title: {
display: true,
fontSize: 15,
text: [
dataset.reduce((t, d) => t + d.data.reduce((a, b) => a + b), 0),
'Volume Total'
],
position: 'bottom'
},
tooltips: {
enabled: false,
custom: function(tooltipModel) {
// Tooltip Element
var tooltipEl = document.getElementById('chartjs-tooltip');
// Create element on first render
if (!tooltipEl) {
tooltipEl = document.createElement('div');
tooltipEl.id = 'chartjs-tooltip';
tooltipEl.innerHTML = '<table></table>';
document.body.appendChild(tooltipEl);
}
// Hide if no tooltip
if (tooltipModel.opacity === 0) {
tooltipEl.style.opacity = 0;
return;
}
// Set caret Position
tooltipEl.classList.remove('above', 'below', 'no-transform');
if (tooltipModel.yAlign) {
tooltipEl.classList.add(tooltipModel.yAlign);
} else {
tooltipEl.classList.add('no-transform');
}
function getBody(bodyItem) {
return bodyItem.lines[0].split(': ')[1].replace('.', ',');
}
// Set Text
if (tooltipModel.body) {
var titleLines = tooltipModel.title || [];
var bodyLines = tooltipModel.body.map(getBody);
var innerHtml = '<thead>';
innerHtml += '</thead><tbody>';
bodyLines.forEach(function(body, i) {
var colors = tooltipModel.labelColors[i];
var style = 'background:' + colors.backgroundColor;
style += '; border-color:' + colors.borderColor;
style += '; border-width: 2px';
var span = '<span style="' + style + '"></span>';
innerHtml += '<tr><td>' + span + body + '</td></tr>';
});
innerHtml += '</tbody>';
var tableRoot = tooltipEl.querySelector('table');
tableRoot.innerHTML = innerHtml;
}
// `this` will be the overall tooltip
var position = this._chart.canvas.getBoundingClientRect();
// Display, position, and set styles for font
tooltipEl.style.opacity = 1;
tooltipEl.style.position = 'absolute';
tooltipEl.style.left = position.left + window.pageXOffset + tooltipModel.caretX + 'px';
tooltipEl.style.top = position.top + window.pageYOffset + tooltipModel.caretY + 'px';
tooltipEl.style.fontFamily = tooltipModel._bodyFontFamily;
tooltipEl.style.fontSize = tooltipModel.bodyFontSize + 'px';
tooltipEl.style.fontStyle = tooltipModel._bodyFontStyle;
tooltipEl.style.padding = tooltipModel.yPadding + 'px ' + tooltipModel.xPadding + 'px';
tooltipEl.style.pointerEvents = 'none';
}
/*
callbacks: {
label: function(tooltipItem, data) {
return data.datasets[tooltipItem.datasetIndex].data[tooltipItem.index].toLocaleString();
},

}*/
}
}
});

#chartjs-tooltip {
opacity: 1;
position: absolute;
background: rgba(0, 0, 0, .7);
color: white;
border-radius: 3px;
-webkit-transition: all .1s ease;
transition: all .1s ease;
pointer-events: none;
-webkit-transform: translate(-50%, 0);
transform: translate(-50%, 0);
}

<canvas id="myChart" style="max-width: 450px"></canvas>
<script src="https://cdn.jsdelivr.net/npm/chart.js@2.8.0"></script>
<script src="https://cdn.jsdelivr.net/gh/emn178/chartjs-plugin-labels/src/chartjs-plugin-labels.js"></script>

你可能想在工具提示中添加一些点作为分隔符，但这取决于你。最好的地方是在getBody方法中。