【发布时间】：2020-09-02 16:38:53
【问题描述】：
我有一个 Node Web 应用程序，最近开始将 ChartJS 库用于数据即。这是我在 EJS 模板页面上的脚本标签中嵌套的内容：
<script>
let playerStatChart = new Chart(myChart, {
type: 'bar',
data: {
labels: ['Freshman', 'Sophomore', 'Junior', 'Senior'],
datasets: [{
label: 'Points',
// Works
data: [1,2,3,4],
// Does not work and appears blank
// One of these data lines is commented out, so there isn't a redundancy
data: pointAvg,
backgroundColor: 'rgb(149,16,16, 0.4)',
borderWidth: 1,
borderColor: '#000',
hoverBorderWidth: 3,
hoverBorderColor: '#000'
}]
},
options: {
title: {
display: true,
text: "Points: <%= player.name %>",
fontSize: 25
},
scales: {
yAxes: [{
ticks: {
beginAtZero: true
}
}]
}
}
});
</script>
我正在尝试动态填充 data 中的值是数据集，而不是包含 [1, 2, 3, 4] 的预定义数组。如您所见，我已经通过使用 EJS 注入值来动态填充图表的标题作为玩家名称。这是我正在使用的示例“玩家”对象：
author: { id: 5e939f988ced3e0428c8b521, username: 'test' },
comments: [
{
author: [Object],
_id: 5eb31d2ea285dbf1f3eb6d80,
text: 'Threesus forever.',
createdAt: 2020-05-06T20:25:18.332Z,
__v: 0
}
],
_id: 5e94ac2d81fa5428b0323fc1,
name: 'Naz Mitrou-Long',
image: 'https://alchetron.com/cdn/naz-long-b96e0ac4-b460-4dd7-ab76-de54cccbd62-resize-750.jpeg',
position: 'Guard',
description: 'Threesus of Nazareth',
__v: 6,
weight: 218,
dob: 1993-08-03T05:00:00.000Z,
hometown: 'Mississauga, ON',
country: 'Canada',
height_feet: 6,
height_inches: 4,
season: [
{
year: '2012-2013',
grade: 'Freshman',
gp: 18,
gs: 0,
mpg: 6.9,
fg: 0.348,
tp: 0.278,
ft: 1,
rpg: 0.8,
apg: 1,
spg: 0.3,
bpg: 0,
ppg: 1.4
},
{
year: '2013-2014',
grade: 'Sophomore',
gp: 36,
gs: 7,
mpg: 20.3,
fg: 0.432,
tp: 0.4,
ft: 0.643,
rpg: 1.6,
apg: 1.1,
spg: 0.2,
bpg: 0.1,
ppg: 7.1
},
{
year: '2014-2015',
grade: 'Junior',
gp: 34,
gs: 33,
mpg: 27.5,
fg: 0.449,
tp: 0.391,
ft: 0.755,
rpg: 2.9,
apg: 2,
spg: 0.8,
bpg: 0.1,
ppg: 10.1
},
{
year: '2015-2016',
grade: 'R. Senior',
gp: 8,
gs: 8,
mpg: 31.6,
fg: 0.425,
tp: 0.291,
ft: 0.6,
rpg: 2.9,
apg: 1.9,
spg: 0.6,
bpg: 0.3,
ppg: 12
},
{
year: '2016-2017',
grade: 'Senior',
gp: 35,
gs: 35,
mpg: 33.3,
fg: 0.473,
tp: 0.384,
ft: 0.795,
rpg: 4.6,
apg: 2.7,
spg: 1.2,
bpg: 0,
ppg: 15.1
}
]
如何遍历每个玩家的“赛季”值并动态填充类似于图表标题的图表数据。下面是我一直在玩的一个例子，它也在上面显示的代码之前的脚本标签中：
let player = "<%= player %>"
let pointAvg = []
player.season.forEach(function(season){
pointAvg.push(season.ppg)
})
但是，当我使用此代码并将数据值设置为 pointAvg 时，图表显示为空白，没有任何值。我在这里错过了什么？
【问题讨论】：
-
您可以通过映射将这些 ppgs 作为十进制数返回到您的数组中
标签： javascript html node.js chart.js ejs