使用chart.js时在x轴上显示日期
使用chart.js时在x轴上显示日期
提问于 2018-02-25 01:08:19
我正在使用chart.js库。我正在创建一个图表，并希望在x轴上显示日期，如下所示：http://www.chartjs.org/samples/latest/scales/time/line.html
我为图形提供了与上面示例相同的配置(除了图形数据的日期格式)，但我的图形显示时间，即凌晨2点，凌晨2点，..而不是日期，即2018-02-01,2018-02-10，...
对于日期格式，我使用Chart.js推荐的moment.js库
我使用了以下代码：
<!doctype html>
<html>
<head>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.20.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.1/Chart.min.js"></script>
</head>
<body>
<div style="width:75%;">
<canvas id="canvas"></canvas>
</div>
<script>
var timeFormat = 'YYYY-MM-DD';
var config = {
type: 'line',
data: {
datasets: [{
label: "Thi is graph label",
backgroundColor: "rgb(54, 162, 235)",
borderColor: "rgb(255, 159, 64)",
fill: false,
data: [{
x: moment("2010-03-01").format(timeFormat),
y: 0.668525
}, {
x: moment("2010-03-02").format(timeFormat),
y: 0.668827
}],
}]
},
options: {
title: {
text: "This is title"
},
scales: {
xAxes: [{
type: "time",
time: {
parser: timeFormat,
tooltipFormat: 'll HH:mm'
},
scaleLabel: {
display: true,
labelString: 'Date'
}
},],
yAxes: [{
scaleLabel: {
display: true,
labelString: 'value'
}
}]
},
}
};
window.onload = function () {
var ctx = document.getElementById("canvas").getContext("2d");
console.log(config);
window.myLine = new Chart(ctx, config);
};
</script>
</body>
</html>
回答 2
Stack Overflow用户
发布于 2018-07-30 22:28:51
<html>
<head>
<title>Line Chart</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.13.0/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.bundle.js"></script>
<style>
canvas {
-moz-user-select: none;
-webkit-user-select: none;
-ms-user-select: none;
}
</style>
</head>
<body>
<div style="width:75%;">
<canvas id="canvas"></canvas>
</div>
<br>
<br>
<button id="randomizeData">Randomize Data</button>
<button id="addDataset">Add Dataset</button>
<button id="removeDataset">Remove Dataset</button>
<button id="addData">Add Data</button>
<button id="removeData">Remove Data</button>
<script>
var timeFormat = 'MM/DD/YYYY HH:mm';
function newDate(days) {
return moment().add(days, 'd').toDate();
}
function newDateString(days) {
return moment().add(days, 'd').format(timeFormat);
}
var color = Chart.helpers.color;
var config = {
type: 'line',
data: {
labels: [ // Date Objects
newDate(0),
newDate(1),
newDate(2),
newDate(3),
newDate(4),
newDate(5),
newDate(6)
],
datasets: [{
label: 'My First dataset',
backgroundColor: color(window.chartColors.red).alpha(0.5).rgbString(),
borderColor: window.chartColors.red,
fill: false,
data: [
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor()
],
}, {
label: 'My Second dataset',
backgroundColor: color(window.chartColors.blue).alpha(0.5).rgbString(),
borderColor: window.chartColors.blue,
fill: false,
data: [
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor(),
randomScalingFactor()
],
}, {
label: 'Dataset with point data',
backgroundColor: color(window.chartColors.green).alpha(0.5).rgbString(),
borderColor: window.chartColors.green,
fill: false,
data: [{
x: newDateString(0),
y: randomScalingFactor()
}, {
x: newDateString(5),
y: randomScalingFactor()
}, {
x: newDateString(7),
y: randomScalingFactor()
}, {
x: newDateString(15),
y: randomScalingFactor()
}],
}]
},
options: {
title: {
text: 'Chart.js Time Scale'
},
scales: {
xAxes: [{
type: 'time',
time: {
format: timeFormat,
// round: 'day'
tooltipFormat: 'll HH:mm'
},
scaleLabel: {
display: true,
labelString: 'Date'
}
}],
yAxes: [{
scaleLabel: {
display: true,
labelString: 'value'
}
}]
},
}
};
window.onload = function() {
var ctx = document.getElementById('canvas').getContext('2d');
window.myLine = new Chart(ctx, config);
};
document.getElementById('randomizeData').addEventListener('click', function() {
config.data.datasets.forEach(function(dataset) {
dataset.data.forEach(function(dataObj, j) {
if (typeof dataObj === 'object') {
dataObj.y = randomScalingFactor();
} else {
dataset.data[j] = randomScalingFactor();
}
});
});
window.myLine.update();
});
var colorNames = Object.keys(window.chartColors);
document.getElementById('addDataset').addEventListener('click', function() {
var colorName = colorNames[config.data.datasets.length % colorNames.length];
var newColor = window.chartColors[colorName];
var newDataset = {
label: 'Dataset ' + config.data.datasets.length,
borderColor: newColor,
backgroundColor: color(newColor).alpha(0.5).rgbString(),
data: [],
};
for (var index = 0; index < config.data.labels.length; ++index) {
newDataset.data.push(randomScalingFactor());
}
config.data.datasets.push(newDataset);
window.myLine.update();
});
document.getElementById('addData').addEventListener('click', function() {
if (config.data.datasets.length > 0) {
config.data.labels.push(newDate(config.data.labels.length));
for (var index = 0; index < config.data.datasets.length; ++index) {
if (typeof config.data.datasets[index].data[0] === 'object') {
config.data.datasets[index].data.push({
x: newDate(config.data.datasets[index].data.length),
y: randomScalingFactor(),
});
} else {
config.data.datasets[index].data.push(randomScalingFactor());
}
}
window.myLine.update();
}
});
document.getElementById('removeDataset').addEventListener('click', function() {
config.data.datasets.splice(0, 1);
window.myLine.update();
});
document.getElementById('removeData').addEventListener('click', function() {
config.data.labels.splice(-1, 1); // remove the label first
config.data.datasets.forEach(function(dataset) {
dataset.data.pop();
});
window.myLine.update();
});
</script>
</body>
</html>Stack Overflow用户
发布于 2019-11-06 23:34:31
您需要设置：
scales: {
xAxes: [
{
.....
ticks: {
source: 'date'
},
}
......
],页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/48965407
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