我被要求创建类似于上面的条形图,我想知道在chart.js中是否可行?我看过许多站点(例如Overlapping Bar Chart using Chart.js和https://github.com/chartjs/Chart.js/issues/5224),但想法是要在彼此之间直接放置两个图形-我需要能够设置图形的位置块(例如,在CSS中几乎像margin-left:-5px
一样)或至少有一些重叠(或大约40%重叠)。如果不是这样,我可能必须在CSS中构建它,但是使用Chart JS会很棒。
答案 0 :(得分:1)
Plugin Core API提供了一系列可用于执行自定义代码的挂钩。您可以使用afterUpdate
挂钩将单个数据集的条形移动所需的像素数,如下所示:
afterUpdate: function(chart) {
let datasets = chart.config.data.datasets;
for (let iDs = 1; iDs < datasets.length; iDs++) {
let dataset = datasets[iDs];
for (var i = 0; i < dataset._meta[0].data.length; i++) {
let model = dataset._meta[0].data[i]._model;
model.x += iDs * offset;
model.controlPointNextX += iDs * offset;
model.controlPointPreviousX += iDs * offset;
}
}
}
请查看下面的可运行代码段,并查看其工作原理。
const offset = 12;
new Chart('myChart', {
type: 'bar',
plugins: [{
afterUpdate: function(chart) {
let datasets = chart.config.data.datasets;
for (let iDs = 1; iDs < datasets.length; iDs++) {
let dataset = datasets[iDs];
for (var i = 0; i < dataset._meta[0].data.length; i++) {
let model = dataset._meta[0].data[i]._model;
model.x += iDs * offset;
model.controlPointNextX += iDs * offset;
model.controlPointPreviousX += iDs * offset;
}
}
}
}],
data: {
labels: ["A"],
datasets: [{
label: 'X',
backgroundColor: 'orange',
borderWidth: 1,
data: [5],
xAxisID: "bar-x-axis1",
barThickness: 30,
},
{
label: 'Y',
backgroundColor: 'red',
data: [10],
xAxisID: "bar-x-axis2",
barThickness: 30,
},
{
label: 'Z',
backgroundColor: 'lightblue',
data: [15],
xAxisID: "bar-x-axis3",
barThickness: 30,
}
]
},
options: {
legend: {
display: false
},
scales: {
xAxes: [{
id: "bar-x-axis3",
display: false
},
{
id: "bar-x-axis2",
offset: true,
display: false
},
{
id: "bar-x-axis1",
offset: true,
ticks: {
display: false
}
}
],
yAxes: [{
id: "bar-y-axis1",
ticks: {
beginAtZero: true,
stepSize: 5
}
}]
}
}
});
canvas {
max-width: 120px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.min.js"></script>
<canvas id="myChart" height="150"></canvas>
更新
还请选中此answer,它会提供稍微改进的解决方案。