未捕获的TypeError: Cannot read property 'textContent'nul

Uncaught TypeError: Cannot read property 'textContent' of null error

本文关键字：property nul textContent read Cannot TypeError      更新时间：2023-09-26

我试图使用dc.js来实现交叉过滤器和d3。我就快成功了。当我在JSFiddle中运行我的代码时，它工作得非常好!但是当我试图在本地系统上实现确切的代码时，它给了我Uncaught TypeError:无法读取null错误的属性'textContent'。

我的代码是

trial1.js 

var yearChart = dc.barChart('#year-chart');
//the data
var data = [
{date: "2015-10-01", type: "car", quantity: 3}];
var dispatch = crossfilter(data);
var parseDate = d3.time.format("%Y-%m-%d").parse;
data.forEach(function (d) {
    d.date = parseDate(d.date);
    d.quantity = +d.quantity;
    d.Year = d.date.getFullYear();
});
var dateDim = dispatch.dimension(function (d) {
    return d.date;
});
var productions = dateDim.group().reduceSum(function (d) {
    return d.quantity;
});
var minDate = dateDim.bottom(1)[0].date;
var maxDate = dateDim.top(1)[0].date;
yearChart.width(2000).height(200)
    .dimension(dateDim)
    .group(productions)
    .x(d3.time.scale().domain([minDate, maxDate]))
    .brushOn(false)
	.centerBar(true)
    .yAxisLabel("Productions per day")
	.xUnits(function(){return 10;});
yearChart.render();
<html>
	<head>
	<meta charset="utf-8">
		<script src="https:////cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js" charset="utf-8"></script>
		<script type="text/javascript" src="https://dc-js.github.io/dc.js/js/d3.js"></script>
		<script type="text/javascript" src="https://dc-js.github.io/dc.js/js/crossfilter.js"></script>
		<script type="text/javascript" src="https://dc-js.github.io/dc.js/js/dc.js"></script>
		<script type="text/javascript" src="https://dc-js.github.io/dc.js/js/colorbrewer.js"></script>
		<script type="text/javascript" src = "trial1.js"></script>
	</head>
	<body>
	<div id="year-chart"></div>
	</body>
</html>

d3.js给出错误的代码行是this.node().textContent;

我也有同样的问题!localy刚刚发现:

 <div id="year-chart"></div>

是的 !

只是尝试设置所有你的html内容在 JS文件之前。而且会很好!

参见示例:

obs:它正在JSFiddle上工作，因为html(必须)在js脚本之前更新!

希望对你也有用。

<!DOCTYPE html>
<html lang="en">
<head>
    <title>dc.js - Bar Chart Example</title>
    <meta charset="UTF-8">
    <link rel="stylesheet" type="text/css" href="http://dc-js.github.io/dc.js/css/dc.css"/>
    <script src="https:////cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js" charset="utf-8"></script>
    <script src="http://dc-js.github.io/dc.js/js/d3.js" charset="utf-8"></script>
    <script src="http://dc-js.github.io/dc.js/js/crossfilter.js"></script>
    <script src="http://dc-js.github.io/dc.js/js/dc.js"></script>
</head>
<body>
    
  
<div id="year-chart"></div> 
<script type="text/javascript">
var yearChart = dc.barChart('#year-chart');
		//the data
		var data = [{
		    date: "2015-10-01",
		    customer: "BOASG",
		    quantity: 3
		}];
		var dispatch = crossfilter(data);
		var parseDate = d3.time.format("%Y-%m-%d").parse;
		data.forEach(function (d) {
		    d.date = parseDate(d.date);
		    d.quantity = +d.quantity;
		    d.Year = d.date.getFullYear();
		});
		var dateDim = dispatch.dimension(function (d) {
		    return d.date;
		});
		var productions = dateDim.group().reduceSum(function (d) {
		    return d.quantity;
		});
		var minDate = dateDim.bottom(1)[0].date;
		window.alert(minDate);
		var maxDate = dateDim.top(1)[0].date;
		window.alert(maxDate);
		yearChart.width(2000).height(200)
		    .dimension(dateDim)
		    .group(productions)
		    .x(d3.time.scale().domain([minDate, maxDate]))
		    .brushOn(false)
		    .centerBar(true)
		    .yAxisLabel("Productions per day")
		    .xUnits(function () {
		    return 10;
		});
		dc.renderAll();
</script>
 <!-- <div id="year-chart"></div>  if you set the code here you will be able to reproduce the issue.-->
</body>
</html>

我将.js文件链接移到html的底部，问题解决了

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