Question

我有一个Angular 7应用程序，我想使用ng2-charts绘制图表。我的应用程序可用here on GitHub。

我按照指南安装了here可用的库：

npm install --save ng2-charts
npm install --save chart.js

我创建了一个组件，并添加了以下代码：
模板

    <div style="display: block;" class="chart">
  <canvas baseChart

          [datasets]="labelMFL"
          [labels]="lineChartLabels"
          [options]="lineChartOptions"
          [chartType]="lineChartType"
          (chartHover)="chartHovered($event)"
          (chartClick)="chartClicked($event)"></canvas>
</div>

组件类：

    import { Component, OnInit } from '@angular/core';


@Component({
  selector: 'app-bar-chart',
  templateUrl: './bar-chart.component.html',
  styleUrls: ['./bar-chart.component.less']
})
export class BarChartComponent {

  public SystemName: string = "MF1";
  firstCopy = false;

  // data
  public lineChartData: Array<number> = [ 1,8,49,50,51];

  public labelMFL: Array<any> = [
      { data: this.lineChartData,
        label: this.SystemName
      }
  ];
  // labels
  public lineChartLabels: Array<any> = ["2018-01-29 10:00:00", "2018-01-29 10:27:00", "2018-01-29 10:28:00", "2018-01-29 10:29:00", "2018-01-29 10:30:00" ];

  constructor(  ) { }

  public lineChartOptions: any = {
    responsive: true,
    scales : {
      yAxes: [{
        ticks: {
          max : 60,
          min : 0,
        }
      }],
      xAxes: [{
        min: '2018-01-29 10:08:00', // how to?
      //  max: '2018-01-29 10:48:00', // how to?
        type: 'time',
        time: {
          unit: 'minute',
          unitStepSize: 10,
          displayFormats: {
            'second': 'HH:mm:ss',
            'minute': 'HH:mm:ss',
            'hour': 'HH:mm',
          },
        },
        }],
    },
  };

   _lineChartColors:Array<any> = [{
       backgroundColor: 'red',
        borderColor: 'red',
        pointBackgroundColor: 'red',
        pointBorderColor: 'red',
        pointHoverBackgroundColor: 'red',
        pointHoverBorderColor: 'red'
      }];



  public lineChartType = 'line';

  public chartClicked(e: any): void {
    console.log(e);
  }
  public chartHovered(e: any): void {
    console.log(e);
  }

}

然后我在另一个组件中实例化了它：

<app-card title="Graph" showTextContent="false">
          <app-bar-chart></app-bar-chart>
      </app-card>

启动应用程序时，出现以下错误：

我以为chart.js存在一些问题，但我不知道是否必须将其添加到某个地方，例如angular.json文件。
我在配置中缺少什么吗？
库的版本有问题吗？

Answer 1

我有同样的问题。事实证明，系统对图表包的匹配版本非常挑剔。在完成相同的安装后，我的package.json具有以下内容：

"chart.js": "^2.8.0",
"core-js": "^2.6.9",
"ng2-charts": "^2.3.0", (or something greater than 2.0.0)

我的Angular模数都是7.2.0。我尝试回滚ng2-charts：

npm安装ng2-charts@2.0.0

此问题已解决。我不得不尝试几个版本。

此页面很有帮助： https://github.com/valor-software/ng2-charts/issues/750

祝你好运！

Answer 2

使用 ng2-图表

在 Angular 9/8 中绘制图表Js

完整的教程source link

第1步）：安装ng2-图表

$ npm install --save ng2-charts 
$ npm install --save chart.js

第2步）在应用模块中导入

// app.module.ts
...
...
import { ChartsModule } from 'ng2-charts';

@NgModule({
  declarations: [
    AppComponent,
    ...
    ...
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    ChartsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

第3步）在组件中使用

模板

<div class="chartjs-container">
    <canvas baseChart 
        [datasets]="lineChartData" 
        [labels]="lineChartLabels" 
        [options]="lineChartOptions"
        [colors]="lineChartColors" 
        [legend]="lineChartLegend" 
        [chartType]="lineChartType" 
        [plugins]="lineChartPlugins"
        (chartHover)="chartHovered($event)" 
        (chartClick)="chartClicked($event)">
    </canvas>
</div>

班级

// line-chart.component.ts
import { Component } from '@angular/core';
import { ChartDataSets, ChartOptions } from 'chart.js';
import { Color, Label } from 'ng2-charts';

@Component({
  selector: 'app-line-chart',
  templateUrl: './line-chart.component.html',
  styleUrls: ['./line-chart.component.css']
})
export class LineChartComponent {

  // Array of different segments in chart
  lineChartData: ChartDataSets[] = [
    { data: [65, 59, 80, 81, 56, 55, 40], label: 'Product A' },
    { data: [28, 48, 40, 19, 86, 27, 90], label: 'Product B' }
  ];

  //Labels shown on the x-axis
  lineChartLabels: Label[] = ['January', 'February', 'March', 'April', 'May', 'June', 'July'];

  // Define chart options
  lineChartOptions: ChartOptions = {
    responsive: true
  };

  // Define colors of chart segments
  lineChartColors: Color[] = [

    { // dark grey
      backgroundColor: 'rgba(77,83,96,0.2)',
      borderColor: 'rgba(77,83,96,1)',
    },
    { // red
      backgroundColor: 'rgba(255,0,0,0.3)',
      borderColor: 'red',
    }
  ];

  // Set true to show legends
  lineChartLegend = true;

  // Define type of chart
  lineChartType = 'line';

  lineChartPlugins = [];

  // events
  chartClicked({ event, active }: { event: MouseEvent, active: {}[] }): void {
    console.log(event, active);
  }

  chartHovered({ event, active }: { event: MouseEvent, active: {}[] }): void {
    console.log(event, active);
  }

}

将ng2-charts添加到Angular 7应用程序

2 个答案: