我正在使用 ng2-charts,需要更多控制.
I am using ng2-charts and require more control.
xAxis 值范围应该动态变化.为此,我需要访问 ng2-charts 使用的 Chart-Object.然后我可以做 这个
The xAxis value range should change dynamically. To achieve this I need to get access to the Chart-Object used by ng2-charts. Then I can do this
这基本上归结为两个步骤:
Which basically boils down to two steps:
//Chart-Object
var barChartDemo = new Chart(ctx).Bar(barChartData, {
responsive: true,
barValueSpacing: 2
});
setInterval(function() {
//removing the first dataentry
barChartDemo.removeData();
//adding new data
barChartDemo.addData([dData()], "dD " + index);
index++;
}, 3000);
我尝试了 this 解决方案,但似乎不推荐使用 getComponent() .为了规避这一点,我尝试使用@ViewChild(带和不带ElementRef),这将导致在接收到的对象上未定义属性chart".
I tried this solution but it seems that getComponent() is deprecated. To circumvent this I tried to use @ViewChild (with and without ElementRef) which would result in property "chart" being undefined on the received object.
查看 ng2-charts 中的 chartjs 实现,我可以看到 BaseChartDirective 控制图表的生成并将生成的图表存储为类属性 (this.chart).但是我不确定如何在我的组件中访问此属性.
Looking into the chartjs implementation in ng2-charts I can see that the BaseChartDirective controls the generation of charts and stores the generated chart as a class property (this.chart). However I am not certain how to get access to this property in my component.
ng2-charts 是一个模块,因此是我的 @NgModule 导入的一部分.
ng2-charts is a module and therefore part of my @NgModule imports.
推荐答案
解决方案是直接在指令上使用@ViewChild 并强制对每个新数据进行重绘.数据添加和删除本身是在 html 中定义的 @Input 对象 lineChartData
上完成的:[datasets]="lineChartData"
The solution was using @ViewChild on the directive directly and forcing a redraw with each new data. Dataadding and removing itself was done on the @Input object lineChartData
which is defined in the html like this: [datasets]="lineChartData"
代码:
import { BaseChartDirective } from 'ng2-charts/charts/charts';
export class Example{
@ViewChild(BaseChartDirective) baseChartDir: BaseChartDirective;
public lineChartData: Array<any>;
//call this function whenever you want an updated version of your chart
this.baseChartDir.ngOnChanges({});
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