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我是ngx-charts的新手我试图通过从bitstamp服务获取数据来呈现动态比特币数据。目标是在视觉上渲染比特币数据(价格和时间戳)到图表(价值和日期(从时间戳编号转换为实际日期)),并且只要比特币数据更新,数据就会自动推送到图表。我试图从这个掠夺者申请类似的方法:https://plnkr.co/edit/JSTcS4FnJ5dshAldLWPL?p=preview。ngx-charts呈现动态数据
不过,我在市场上数据分量误差,例如音调:
属性d:预计数,“M0,NaNZ”。 属性cy:预计长度,“NaN”。
我不知道我在哪一步做错了。下面是相关的脚本:
bitstamp.service.ts:
import Pusher from 'pusher-js';
import { Injectable, Output, EventEmitter } from '@angular/core';
import { Observable } from 'rxjs/Observable'
import { BehaviorSubject } from "rxjs/Rx";
import { List } from 'immutable';
@Injectable()
export class BitstampService {
private pusher: any;
private _messages: BehaviorSubject<any> = new BehaviorSubject(null);
public messages: Observable<any> = this._messages.asObservable();
constructor() {
this.pusher = new Pusher('de504dc5763aeef9ff52');
this.pusher.logToConsole = true;
let channel = this.pusher.subscribe('live_trades');
channel.bind('trade', (data) => {
this._messages.next(data);
});
}
}
市场data.component.ts:
import { Component, OnInit } from '@angular/core';
import { BitstampService } from '../../services/bitstamp.service';
import { Subject } from "rxjs/Subject";
@Component({
selector: 'app-market-data',
templateUrl: './market-data.component.html',
styleUrls: ['./market-data.component.scss']
})
export class MarketDataComponent implements OnInit {
private ngUnsubscribe: Subject<void> = new Subject<void>();
bitcoinData: any = [
{
name: 'Bitcoin',
series: [
{
"name": new Date,
"value": Number
}
]
}
];
view: any[] = [960, 500];
// options
showXAxis = true;
showYAxis = true;
gradient = false;
showLegend = true;
showXAxisLabel = true;
xAxisLabel = 'Year';
showYAxisLabel = true;
yAxisLabel = 'USD';
intervalId:any;
colorScheme = {
domain: ['#DC143C', '#A10A28', '#C7B42C', '#AAAAAA']
};
// line, area
autoScale = true;
constructor(private bitstamp: BitstampService) {
}
onSelect(event) {
console.log(event);
}
ngOnInit() {
this.bitstamp.messages.takeUntil(this.ngUnsubscribe).subscribe(data => {
if (data != null) {
this.bitcoinData[0].series.push({"name": new Date(parseInt(data.timestamp)*1000), "value": Math.floor(data.price)});
}
this.bitcoinData = [...this.bitcoinData];
}, (err) => {
console.log(err);
});
}
ngOnDestroy() {
this.ngUnsubscribe.next();
this.ngUnsubscribe.complete();
}
}
市场data.component.html:
<ngx-charts-line-chart
[view]="view"
[scheme]="colorScheme"
[results]="bitcoinData"
[gradient]="gradient"
[xAxis]="showXAxis"
[yAxis]="showYAxis"
[legend]="showLegend"
[showXAxisLabel]="showXAxisLabel"
[showYAxisLabel]="showYAxisLabel"
[xAxisLabel]="xAxisLabel"
[yAxisLabel]="yAxisLabel"
[autoScale]="autoScale"
(select)="onSelect($event)">
</ngx-charts-line-chart>
预先感谢您。