朋克:Here
我有一个儿童comp chartist.component,用于渲染chartist charts
在父组件app.ts中,我两次调用chartist.component来绘制折线图和条形图
在父组件中,我有一些按钮来刷新折线图和条形图,它们仅更改data变量中的数据,然后将其传递给子组件以呈现图表。
我的问题是,单击刷新按钮后,图表只会更新一次。我想在每次数据对象更改时更新图表。
app.ts(父组件):
import {Component, NgModule, OnInit, AfterViewInit} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import {ChartistChart} from './chartist.component'
@Component({
selector: 'my-app',
templateUrl: './src/app.html',,
})
export class App implements OnInit, AfterViewInit {
name:string;
data: any;
isFirst:true;
dataIndex:number;
allData:any;
constructor() {
this.name = 'Angular2'
this.dataIndex=0;
this.allData=[{chart data1},{chart data 2}];
}
ngOnInit() {
this.getAllCharts();
}
ngAfterViewInit() {}
public getAllCharts(){
this.data= this.allData[this.dataIndex];
return this.allData[this.dataIndex];
}
public updateLineChart(){
this.isFirst = !this.isFirst;
this.dataIndex = this.isFirst?0:1;
this.data.simpleLineData = this.allData[this.dataIndex].simpleLineData;
this.data.simpleLineOptions = this.allData[this.dataIndex].simpleLineOptions;
}
public updateBarChart(){
this.isFirst = !this.isFirst;
this.dataIndex = this.isFirst?0:1;
this.data.simpleBarData = this.allData[this.dataIndex].simpleBarData;
this.data.simpleBarOptions = this.allData[this.dataIndex].simpleBarOptions;
}
}
@NgModule({
imports: [ BrowserModule ],
declarations: [ App, ChartistChart ],
bootstrap: [ App ]
})
export class AppModule {}
app.html:
<div style="width:100%; height:350px">
<button (click)="updateLineChart()">Update Line chart</button> DataIndex: {{dataIndex}}
<chartist-chart *ngIf="data" chartistChartClass="ct-chart" chartistChartType="Line" [chartistChartData]="data['simpleLineData']"
[chartistChartOptions]="data['simpleLineOptions']">
</chartist-chart>
</div>
<br/> <br/>
<div style="width:100%; height:350px">
<button (click)="updateBarChart()">Update Bar chart</button> DataIndex: {{dataIndex}}
<chartist-chart *ngIf="data" chartistChartClass="ct-chart" chartistChartType="Bar" [chartistChartData]="data['simpleBarData']"
[chartistChartOptions]="data['simpleBarOptions']">
</chartist-chart>
</div>
chartist.component.ts(子级):
import {
Component, ViewChild, Input, Output, ElementRef, EventEmitter, ChangeDetectorRef
} from '@angular/core';
@Component({
selector: 'chartist-chart',
templateUrl: './src/chartistChart.html',
providers: [],
})
export class ChartistChart {
@Input() chartistChartType: string;
@Input() chartistChartData: Object;
@Input() chartistChartOptions: Object;
@Input() chartistChartResponsive: Object;
@Input() chartistChartClass: string;
@Output() onChartReady = new EventEmitter<any>();
@ViewChild('chartistChart') public _selector: ElementRef;
private chart;
constructor(private cdr: ChangeDetectorRef){}
ngAfterViewInit() {
console.log('chart init', this.chartistChartData)
let _self = this;
_self.chart = new Chartist[_self.chartistChartType](_self._selector.nativeElement,
_self.chartistChartData,
_self.chartistChartOptions);
_self.onChartReady.emit(_self.chart);
this.cdr.detectChanges();
}
ngOnChanges(changes) {
if (this.chart) {
console.log('chartistChartData changed: ',this.chartistChartData);
(<any>this.chart).update(this.chartistChartData, this.chartistChartOptions);
}
}
ngOnDestroy(): void {
if (this.chart) {
this.chart.detach();
}
}
}
chartistChart.html:
<div #chartistChart class="{{chartistChartClass || ''}}"></div>
最佳答案
您需要做的就是在每次单击按钮时手动调用this.getAllCharts()
,以便将this.data
重新分配给新的数据系列:
public updateLineChart() {
this.dataIndex = this.dataIndex ? 0 : 1;
this.getAllCharts();
}
public updateBarChart() {
this.dataIndex = this.dataIndex ? 0 : 1;
this.getAllCharts();
}
您也可以摆脱多余的
isFirst
标志,dataIndex
就足够了。而且您也不需要手动设置this.data.simpleBarData
和this.data.simpleLineData
,因为它们已经作为props在模板中传递了。演示:https://plnkr.co/edit/1eyTe5WYFAjL9ssRgdiS?p=preview
关于javascript - 无法从 Angular 2中的父级更新子级组件 View ,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/42886061/