条形图的水平线

Question

信息：Chart.js v3.8.2https://www.chartjs.org

new Chart(document.getElementById('esneklik').getContext('2d'), {
type: 'bar',
data: {
labels: ['test','test 2'],
datasets: [{
label: ' ',
data: [24,20],
backgroundColor: ['rgba(1, 56, 108, 0.6)'],
borderColor: ['rgba(1, 56, 108, 1'],
borderWidth: 1
}]
},
options: {
scales: {
y: {
beginAtZero: true,
type: 'linear',
min: 5,
max: 50
}
}
}
});

示例：在此处输入图像描述

我想水平画一条线，并显示平均值。

Answer 1

您可以为该行添加第二个数据集。

将类型指定为'line'，并将fill设置为false

datasets: [{
type: 'line',  // <-- type as line
label: 'avg',
data: [22,22],
fill: false,   // <-- fill as false
backgroundColor: 'red',
borderColor: 'red',
borderWidth: 1
}, {
label: 'bar',
data: [24,20],
backgroundColor: 'rgba(1, 56, 108, 0.6)',
borderColor: 'rgba(1, 56, 108, 1)',
borderWidth: 1
}]

应该首先添加行数据集，否则它将落后于

请参阅以下工作片段。。。

$(document).ready(function() {
new Chart(document.getElementById('esneklik').getContext('2d'), {
type: 'bar',
data: {
labels: ['test','test 2'],
datasets: [{
type: 'line',
label: 'avg',
data: [22,22],
fill: false,
backgroundColor: 'red',
borderColor: 'red',
borderWidth: 1
}, {
label: 'bar',
data: [24,20],
backgroundColor: 'rgba(1, 56, 108, 0.6)',
borderColor: 'rgba(1, 56, 108, 1)',
borderWidth: 1
}]
},
options: {
scales: {
yAxes: [{
beginAtZero: true,
type: 'linear',
ticks: {
min: 5,
max: 50
}
}]
}
}
});
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.9.3/Chart.bundle.min.js"></script>
<canvas id="esneklik"></canvas>