有时我们需要创建图表以在Ionic 4移动应用程序中显示任何进度或报告。现在，我们必须向您展示一个简单的分步教程，使用Ionic 4和Angular 4轻松创建漂亮的图表（线条，圆环和条形图）。本教程使用现有的Angular 2指令模块，可以很好地使用Angular 4该指令使得Charts.js的使用更加简单，易于与Angular 4应用程序集成，在本例中适用于Ionic 4移动应用程序。
在本教程中，我们只需要很少的工具和模块：
Node.js
Ionic 4和Angular 4
Angular 2 Charts
Charts.js
1.安装Angular 2 Charts和Charts.js
要安装Angular 2图表和Charts.js，只需输入此命令即可。
npm install ng2-charts --save
npm install chart.js --save
打开并编辑对应页面’XXX.module.ts’添加此导入。(ionic4不在app.module.ts引用,会报错)
import { ChartsModule } from ''ng2-charts’;
然后在imports数组中声明图表模块。
imports: [
CommonModule,
FormsModule,
IonicModule,
ChartsModule,
RouterModule.forChild(routes)
]
2.显示折线图
<canvas baseChart width="300" height="400"
[datasets]="lineChartData"
[labels]="lineChartLabels"
[options]="lineChartOptions"
[colors]="lineChartColors"
[legend]="lineChartLegend"
[chartType]="lineChartType"
(chartHover)="chartHovered($event)"
(chartClick)="chartClicked($event)">
</canvas>
public lineChartData:Array<any> = [
{data: [65, 59, 80, 81, 56, 55, 40], label: 'Series A'},
{data: [28, 48, 40, 19, 86, 27, 90], label: 'Series B'},
{data: [18, 48, 77, 9, 100, 27, 40], label: 'Series C'}
];
public lineChartLabels:Array<any> = ['January', 'February', 'March', 'April', 'May', 'June', 'July'];
public lineChartOptions:any = {
responsive: true
};
public lineChartColors:Array<any> = [
{ // grey
backgroundColor: 'rgba(148,159,177,0.2)',
borderColor: 'rgba(148,159,177,1)',
pointBackgroundColor: 'rgba(148,159,177,1)',
pointBorderColor: '#fff',
pointHoverBackgroundColor: '#fff',
pointHoverBorderColor: 'rgba(148,159,177,0.8)'
},
{ // dark grey
backgroundColor: 'rgba(77,83,96,0.2)',
borderColor: 'rgba(77,83,96,1)',
pointBackgroundColor: 'rgba(77,83,96,1)',
pointBorderColor: '#fff',
pointHoverBackgroundColor: '#fff',
pointHoverBorderColor: 'rgba(77,83,96,1)'
},
{ // grey
backgroundColor: 'rgba(148,159,177,0.2)',
borderColor: 'rgba(148,159,177,1)',
pointBackgroundColor: 'rgba(148,159,177,1)',
pointBorderColor: '#fff',
pointHoverBackgroundColor: '#fff',
pointHoverBorderColor: 'rgba(148,159,177,0.8)'
}
];
public lineChartLegend:boolean = true;
public lineChartType:string = 'line';
public randomize():void {
let _lineChartData:Array<any> = new Array(this.lineChartData.length);
for (let i = 0; i < this.lineChartData.length; i++) {
_lineChartData[i] = {data: new Array(this.lineChartData[i].data.length), label: this.lineChartData[i].label
};
for (let j = 0; j < this.lineChartData[i].data.length; j++) {
_lineChartData[i].data[j] = Math.floor((Math.random() * 100) + 1);
}
}
this.lineChartData = _lineChartData;
}
// events
public chartClicked(e:any):void {
console.log(e);
}
public chartHovered(e:any):void {
console.log(e);
}
3.创建条形图
<canvas baseChart
[datasets]="barChartData"
[labels]="barChartLabels"
[options]="barChartOptions"
[legend]="barChartLegend"
[chartType]="barChartType"
(chartHover)="chartHovered($event)"
(chartClick)="chartClicked($event)">
</canvas>
public lineChartData:Array<any> = [
{data: [65, 59, 80, 81, 56, 55, 40], label: 'Series A'},
{data: [28, 48, 40, 19, 86, 27, 90], label: 'Series B'},
{data: [18, 48, 77, 9, 100, 27, 40], label: 'Series C'}
];
public lineChartLabels:Array<any> = ['January', 'February', 'March', 'April', 'May', 'June', 'July'];
public lineChartOptions:any = {
responsive: true
};
public lineChartColors:Array<any> = [
{ // grey
backgroundColor: 'rgba(148,159,177,0.2)',
borderColor: 'rgba(148,159,177,1)',
pointBackgroundColor: 'rgba(148,159,177,1)',
pointBorderColor: '#fff',
pointHoverBackgroundColor: '#fff',
pointHoverBorderColor: 'rgba(148,159,177,0.8)'
},
{ // dark grey
backgroundColor: 'rgba(77,83,96,0.2)',
borderColor: 'rgba(77,83,96,1)',
pointBackgroundColor: 'rgba(77,83,96,1)',
pointBorderColor: '#fff',
pointHoverBackgroundColor: '#fff',
pointHoverBorderColor: 'rgba(77,83,96,1)'
},
{ // grey
backgroundColor: 'rgba(148,159,177,0.2)',
borderColor: 'rgba(148,159,177,1)',
pointBackgroundColor: 'rgba(148,159,177,1)',
pointBorderColor: '#fff',
pointHoverBackgroundColor: '#fff',
pointHoverBorderColor: 'rgba(148,159,177,0.8)'
}
];
public lineChartLegend:boolean = true;
public lineChartType:string = 'line';
public randomize():void {
let _lineChartData:Array<any> = new Array(this.lineChartData.length);
for (let i = 0; i < this.lineChartData.length; i++) {
_lineChartData[i] = {data: new Array(this.lineChartData[i].data.length), label: this.lineChartData[i].label};
for (let j = 0; j < this.lineChartData[i].data.length; j++) {
_lineChartData[i].data[j] = Math.floor((Math.random() * 100) + 1);
}
}
this.lineChartData = _lineChartData;
}
// events
public chartClicked(e:any):void {
console.log(e);
}
public chartHovered(e:any):void {
console.log(e);
}
4.创建环形图标
<canvas baseChart
[data]="doughnutChartData"
[labels]="doughnutChartLabels"
[chartType]="doughnutChartType"
(chartHover)="chartHovered($event)"
(chartClick)="chartClicked($event)">
</canvas>
ts
public doughnutChartLabels:string[] = ['Download Sales', 'In-Store Sales', 'Mail-Order Sales'];
public doughnutChartData:number[] = [350, 450, 100];
public doughnutChartType:string = 'doughnut';
// events
public chartClicked(e:any):void {
console.log(e);
}
public chartHovered(e:any):void {
console.log(e);
}
这是详细的官方文档 https://www.chartjs.org/docs/latest/
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