我正在尝试修改 Rendering a Chart from User Input for CanvasJS 的示例。我希望 x 轴成为时间线。我觉得我走在正确的轨道上,但现在陷入了设置正确的时间输入的困境。 代码是:
var dps = []; //dataPoints.
var chart = new CanvasJS.Chart("chartContainer", {
title: {
text: "DataPoints from User Input"
},
axisX: {
valueFormatString: "HH:mm",
labelAngle: -50
},
axisY: {
valueFormatString: "###"
},
color: "#F08080",
data: [{
type: "line",
xValueFormatString: "HH:mm",
dataPoints: dps
}]
});
function addDataPointsAndRender() {
xValue = Number(document.getElementById("xValue").value);
yValue = Number(document.getElementById("yValue").value);
dps.push({
x: new Date(xValue),
y: yValue
});
chart.render();
}
var renderButton = document.getElementById("renderButton");
renderButton.addEventListener("click", addDataPointsAndRender);
我知道使用 new Date()
时存在问题,但不确定是什么。
这是一个codepen
如有任何帮助,我们将不胜感激!
最佳答案
如果您希望 x 轴显示添加数据的时间,请让 Date 函数不带任何参数。
x: new Date(),
如果您希望用户选择时间:
HTML
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
<link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.css" rel="stylesheet"/>
<script src="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.js"></script>
<link href="//cdnjs.cloudflare.com/ajax/libs/bootstrap-datetimepicker/4.17.47/css/bootstrap-datetimepicker.css" rel="stylesheet"/>
<script src="//cdnjs.cloudflare.com/ajax/libs/bootstrap-datetimepicker/4.17.47/js/bootstrap-datetimepicker.min.js"></script>
<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<title>Document</title>
</head>
<body>
X Value:
<div class='input-group date' id='xValue'>
<input type='text' class="form-control" />
<span class="input-group-addon">
<span class="glyphicon glyphicon-calendar"></span>
</span>
</div>
<input id="yValue" type="number" step="any" placeholder="Enter Y-Value">
<button id="renderButton">Add DataPoint & Render</button>
<div id="chartContainer" style="height: 370px; max-width: 920px; margin: 0px auto;">
</div>
</body>
</html>
JS
$(document).ready(function(){
$('#xValue').datetimepicker();
})
var dps = []; //dataPoints.
var chart = new CanvasJS.Chart("chartContainer", {
title: {
text: "DataPoints from User Input"
},
axisX:{
valueFormatString: "HH:mm" ,
labelAngle: -50
},
axisY: {
valueFormatString: "###"
},
color: "#F08080",
data: [{
type: "line",
xValueFormatString: "HH:mm",
dataPoints: dps
}]
});
function addDataPointsAndRender() {
var date = $('#xValue').data("DateTimePicker").date();
yValue = Number(document.getElementById("yValue").value);
dps.push({
x: new Date(date.unix()*1000),
y: yValue
});
chart.render();
}
var renderButton = document.getElementById("renderButton");
renderButton.addEventListener("click", addDataPointsAndRender);
关于javascript - CanvasJS - 根据用户输入渲染时间线图表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59925691/