Chart.js 在每个条顶部添加数据时出错
我需要把Chart.JS的每个条的值放在上面。下面是脚本:Chart.js 在每个条顶部添加数据时出错,chart.js,Chart.js,我需要把Chart.JS的每个条的值放在上面。下面是脚本: var areaChartData = { labels: ["January", "February", "March", "April", "May", "June", "July", "August" , "September", "October", "November", "December"], datasets: [ { label: "Cas
var areaChartData = {
labels: ["January", "February", "March", "April", "May", "June", "July", "August"
, "September", "October", "November", "December"],
datasets: [
{
label: "Cash Income",
strokeColor: "rgba(210, 214, 222, 1)",
pointColor: "rgba(210, 214, 222, 1)",
pointStrokeColor: "#c1c7d1",
pointHighlightFill: "#fff",
pointHighlightStroke: "rgba(220,220,220,1)",
data: costData
}
]
};
var barChartCanvas = $("#barChart").get(0).getContext("2d");
var barChart = new Chart(barChartCanvas);
var barChartData = areaChartData;
barChartData.datasets[0].fillColor = "#00c0ef";
barChartData.datasets[0].strokeColor = "#00c0ef";
barChartData.datasets[0].pointColor = "#00a65a";
var barChartOptions = {
//Boolean - Whether the scale should start at zero, or an order of magnitude down from the lowest value
scaleBeginAtZero: true,
//Boolean - Whether grid lines are shown across the chart
scaleShowGridLines: true,
//String - Colour of the grid lines
scaleGridLineColor: "rgba(0,0,0,.05)",
//Number - Width of the grid lines
scaleGridLineWidth: 1,
//Boolean - Whether to show horizontal lines (except X axis)
scaleShowHorizontalLines: true,
//Boolean - Whether to show vertical lines (except Y axis)
scaleShowVerticalLines: true,
//Boolean - If there is a stroke on each bar
barShowStroke: true,
//Number - Pixel width of the bar stroke
barStrokeWidth: 2,
//Number - Spacing between each of the X value sets
barValueSpacing: 5,
//Number - Spacing between data sets within X values
barDatasetSpacing: 1,
//String - A legend template
legendTemplate: "<ul class=\"<%=name.toLowerCase()%>-legend\"><% for (var i=0; i<datasets.length; i++){%><li><span style=\"background-color:<%=datasets[i].fillColor%>\"></span><%if(datasets[i].label){%><%=datasets[i].label%><%}%></li><%}%></ul>",
//Boolean - whether to make the chart responsive
responsive: true,
maintainAspectRatio: true,
onAnimationComplete: function () {
var barChartData = this.chart.barChartData;
barChartData.font = this.scale.font;
barChartData.fillStyle = this.scale.textColor
barChartData.textAlign = "center";
barChartData.textBaseline = "bottom";
this.datasets.forEach(function (dataset) {
dataset.bars.forEach(function (bar) {
barChartData.fillText(bar.value, bar.x, bar.y - 5);
});
})
}
};
barChartOptions.datasetFill = false;
barChart.Bar(barChartData, barChartOptions);
}
var区域图表数据={
标签:[“一月”、“二月”、“三月”、“四月”、“五月”、“六月”、“七月”、“八月”
,“九月”、“十月”、“十一月”、“十二月”],
数据集:[
{
标签:“现金收入”,
strokeColor:“rgba(210、214、222、1)”,
pointColor:“rgba(210、214、222、1)”,
pointStrokeColor:#c1c7d1“,
pointHighlightFill:“fff”,
pointHighlightStroke:“rgba(2201)”,
数据:成本数据
}
]
};
var barChartCanvas=$(“#barChart”).get(0.getContext(“2d”);
var barChart=新图表(barChartCanvas);
var barChartData=areaChartData;
barChartData.datasets[0].fillColor=“#00c0ef”;
barChartData.datasets[0].strokeColor=“#00c0ef”;
barChartData.datasets[0].pointColor=“#00a65a”;
var barChartOptions={
//布尔值-刻度是从零开始,还是从最低值向下一个数量级开始
scaleBeginAtZero:对,
//布尔值-是否在图表中显示网格线
scaleShowGridLines:对,
//字符串-网格线的颜色
scaleGridLineColor:“rgba(0,0,0,05)”,
//Number—网格线的宽度
scaleGridLineWidth:1,
//布尔值-是否显示水平线(X轴除外)
缩放水平线:对,
//布尔值-是否显示垂直线(Y轴除外)
scaleShowVerticalLines:没错,
//布尔-如果每个条上都有一个笔划
barShowStroke:是的,
//数字-条笔划的像素宽度
杆行程宽度:2,
//数字-每个X值集之间的间距
barValueSpacing:5,
//数字-X值内数据集之间的间距
barDatasetSpacing:1,
//字符串-图例模板
legendTemplate:“
”,
//布尔值-是否使图表响应
回答:是的,
维护Aspectratio:是的,
onAnimationComplete:函数(){
var barChartData=this.chart.barChartData;
barChartData.font=this.scale.font;
barChartData.fillStyle=this.scale.textColor
barChartData.textAlign=“中心”;
barChartData.textBaseline=“底部”;
this.datasets.forEach(函数(数据集){
dataset.bar.forEach(函数(bar){
barChartData.fillText(bar.value、bar.x、bar.y-5);
});
})
}
};
barChartOptions.datasetFill=false;
barChart.Bar(barChartData、barChartOptions);
}
我总是会遇到这样的错误:
未捕获的TypeError:无法设置未定义的属性“font”
我不熟悉Chart.JS,不知道发生了什么。您发布的问题在您的
onAnimationComplete
函数中this.chart.barChartData
未定义,这就是代码开始失败的原因
不完全确定要执行的操作,但如果要删除那些试图编辑未定义属性的行,则将不再收到错误。但是就像我说的,从你的问题中不清楚你想要达到什么,所以除了这个,我不知道该建议什么
例如:
如果要在其中设置内容,您确实可以访问选项this.options
和数据集this.dataset