Angular 角度:如何使用动态值(arry)在chartjs中显示图形
我试图使用chartJS-2显示包含用户活动数组的图形,但显示不正确:Angular 角度:如何使用动态值(arry)在chartjs中显示图形,angular,typescript,charts,chart.js2,ng2-charts,Angular,Typescript,Charts,Chart.js2,Ng2 Charts,我试图使用chartJS-2显示包含用户活动数组的图形,但显示不正确: 从'@angular/core'导入{Component,OnInit,Input}; 从'chart.js'导入{ChartOptions,ChartType,ChartDataSets}; 从“chartjs plugin datalabels”导入*作为pluginDataLabels; 从“ng2图表”导入{Label}; 从'src/app/iblink point'导入{IblinkPoint}; 从'src/
从'@angular/core'导入{Component,OnInit,Input};
从'chart.js'导入{ChartOptions,ChartType,ChartDataSets};
从“chartjs plugin datalabels”导入*作为pluginDataLabels;
从“ng2图表”导入{Label};
从'src/app/iblink point'导入{IblinkPoint};
从'src/app/blinking/openweb.service'导入{OpenWebService};
@组成部分({
选择器:“应用程序图形”,
templateUrl:'./graph.component.html',
样式URL:['./graph.component.scss']
})
导出类GraphComponent实现OnInit{
公共条形图选项:图表选项={
回答:是的,
//我们使用这些空结构作为动态主题化的占位符。
比例:{xAxes:[{}],yAxes:[{}]},
插件:{
数据标签:{
主持人:"结束",,
对齐:“结束”,
}
}
};
公共barChartType:ChartType='bar';
公共图表颜色:数组=[
{
背景颜色:“rgb(77,0,77,1)”,
边框颜色:“rgba(77,0,77,1)”,
边界宽度:2,
}
];
公共barChartData:ChartDataSets[];
公共条形图标签:标签[];
@Input()闪烁:IblinkPoint[];
构造函数(私有openWebService:openWebService){}
恩戈尼尼特(){
让arrBlinks=this.openWebService.getBlinkData();
让startDateArry:任意[]=[];
让endDateArry:any[]=[];
让blinkArry:any[]=[];
arrBlinks.forEach(元素=>{
blinkArry.push(element.blinkCounter.toString);
startDateArry.push(element.startDate.getMinutes().toString());
//控制台日志(startDateArry);
//push(element.endDate.getHours());
});
this.barChartLabels=[startDateArry];
this.barChartData=[{data:blinkArry,标签:'blinks'}];
//console.log(this.barChartData);
//console.log(this.barChartLabels);
}
}
此问题是由此声明引起的 this.barChartLabels=[startDateArry] 这是当您插入数组
startDateArry
作为数组this.barChartLabels
的第一项时;相反,你应该做:
this.barChartLabels=startDateArry
相关的HTML:
<div style="display: block;">
<canvas baseChart
[datasets]="barChartData"
[labels]="barChartLabels"
[options]="barChartOptions"
[plugins]="barChartPlugins"
[legend]="barChartLegend"
[chartType]="barChartType">
</canvas>
</div>
import { Component, OnInit } from '@angular/core';
import { ChartOptions, ChartType, ChartDataSets } from 'chart.js';
import { Label } from 'ng2-charts';
@Component({
selector: 'my-app',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
public barChartOptions: ChartOptions = {
responsive: true,
// We use these empty structures as placeholders for dynamic theming.
scales: { xAxes: [{}], yAxes: [{}] },
plugins: {
datalabels: {
anchor: 'end',
align: 'end',
}
}
};
public barChartLabels: Label[];
public barChartType: ChartType = 'bar';
public barChartLegend = true;
public barChartPlugins = [];
public barChartData: ChartDataSets[];
constructor() {
}
ngOnInit() {
let startDateArry: any[] = [];
let blinkArry: any[] = [];
for (var i = 0; i < 7; i++) {
blinkArry.push(Math.round(Math.random() * 100));
startDateArry.push(Math.round(Math.random() * 100));
}
this.barChartData = [{ data: blinkArry, label: 'blinks' }];
this.barChartLabels = [startDateArry];
console.log('this is the issue!', this.barChartLabels);
/* SOLUTION */
this.barChartLabels = startDateArry;
console.log('this is the fix!!!', this.barChartLabels);
}
}
相关TS:
<div style="display: block;">
<canvas baseChart
[datasets]="barChartData"
[labels]="barChartLabels"
[options]="barChartOptions"
[plugins]="barChartPlugins"
[legend]="barChartLegend"
[chartType]="barChartType">
</canvas>
</div>
import { Component, OnInit } from '@angular/core';
import { ChartOptions, ChartType, ChartDataSets } from 'chart.js';
import { Label } from 'ng2-charts';
@Component({
selector: 'my-app',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
public barChartOptions: ChartOptions = {
responsive: true,
// We use these empty structures as placeholders for dynamic theming.
scales: { xAxes: [{}], yAxes: [{}] },
plugins: {
datalabels: {
anchor: 'end',
align: 'end',
}
}
};
public barChartLabels: Label[];
public barChartType: ChartType = 'bar';
public barChartLegend = true;
public barChartPlugins = [];
public barChartData: ChartDataSets[];
constructor() {
}
ngOnInit() {
let startDateArry: any[] = [];
let blinkArry: any[] = [];
for (var i = 0; i < 7; i++) {
blinkArry.push(Math.round(Math.random() * 100));
startDateArry.push(Math.round(Math.random() * 100));
}
this.barChartData = [{ data: blinkArry, label: 'blinks' }];
this.barChartLabels = [startDateArry];
console.log('this is the issue!', this.barChartLabels);
/* SOLUTION */
this.barChartLabels = startDateArry;
console.log('this is the fix!!!', this.barChartLabels);
}
}
从'@angular/core'导入{Component,OnInit};
从'chart.js'导入{ChartOptions,ChartType,ChartDataSets};
从“ng2图表”导入{Label};
@组成部分({
选择器:“我的应用程序”,
templateUrl:“./app.component.html”,
样式URL:['./app.component.css']
})
导出类AppComponent实现OnInit{
公共条形图选项:图表选项={
回答:是的,
//我们使用这些空结构作为动态主题化的占位符。
比例:{xAxes:[{}],yAxes:[{}]},
插件:{
数据标签:{
主持人:"结束",,
对齐:“结束”,
}
}
};
公共条形图标签:标签[];
公共barChartType:ChartType='bar';
公共条形图图例=真;
公共条形图插件=[];
公共barChartData:ChartDataSets[];
构造函数(){
}
恩戈尼尼特(){
让startDateArry:任意[]=[];
让blinkArry:any[]=[];
对于(变量i=0;i<7;i++){
blinkArry.push(Math.round(Math.random()*100));
startDaterry.push(Math.round(Math.random()*100));
}
this.barChartData=[{data:blinkArry,标签:'blinks'}];
this.barChartLabels=[startDateArry];
console.log('这就是问题!',this.barChartLabels);
/*解决方案*/
this.barChartLabels=startDateArry;
console.log('this is fix!!!',this.barChartLabels);
}
}
您可以在中看到这两个语句之间的差异