2

我想根据 JSON 数据创建图表。我使用 angular2-highcharts 我的 ChartsMain 组件看起来像：

@Component({
moduleId: module.id,
selector: 'charts',
templateUrl: 'charts.html',
directives: [CHART_DIRECTIVES,]
providers: [DataService]
})
export class ChartsMain {

result: Data[];

constructor(DataService:DataService) {
    DataService.getData().subscribe(res => this.result = res);
        this.options = {
            chart: {
                type: "candlestick"
            },
            title: {
                text: "JSON data"
            },
            xAxis: {
                type: "category",
                allowDecimals: false,
                title: {
                    text: ""
                }
            },
            yAxis: {
                title: {
                    text: "Number"
                }
            },
            series: [{
                name: "Hour",
                data: this.result
            }]
        };
}
options: Object;

我的 DataService 看起来：

@Injectable()
export class DataService {

http: Http;
constructor(http: Http) {
    this.http = http;
}


getData(): Observable<Array<Data>> {
    return this.http.get('http://JSON-DATA')
        .map(this.extractData)
        .catch(this.handleError)
}

private extractData(res: Response) {
    let body = res.json();
    return body || { };
}
private handleError(error: any) {
    // In a real world app, we might use a remote logging infrastructure
    // We'd also dig deeper into the error to get a better message
    let errMsg = (error.message) ? error.message :
        error.status ? `${error.status} - ${error.statusText}` : 'Server error';
    console.error(errMsg); // log to console instead
    return Observable.throw(errMsg);
}
}

我的图表

哪里有问题，为什么图表是空的？如何用 JSON 数据填充图表。JSON 数据必须是任何特定格式？

4

2 回答 2

3

烛台图通常用于显示一段时间内的开盘价、最高价、最低价和收盘价。

示例预期的 JSON 格式如下所示 -

[
[1250553600000,23.09,23.46,23.06,23.43],
[1250640000000,23.25,23.61,23.21,23.51],
[1250726400000,23.57,23.82,23.52,23.76],
[1250812800000,23.95,24.20,23.83,24.17],
[1251072000000,24.30,24.39,24.04,24.15],
[1251158400000,24.21,24.42,24.16,24.20],
[1251244800000,24.13,24.22,23.82,23.92],
[1251331200000,24.11,24.22,23.55,24.21],
[1251417600000,24.61,24.64,24.08,24.29],
[1251676800000,24.02,24.12,23.79,24.03],
]

这是带有烛台高图的示例组件-

import { Component } from '@angular/core';
import {JSONP_PROVIDERS, Jsonp} from '@angular/http';
import { CHART_DIRECTIVES } from 'angular2-highcharts';


@Component({
    selector: 'high-chart',
    directives: [CHART_DIRECTIVES],
    providers: [JSONP_PROVIDERS],
    template: `
    <h2> This is HighChart CandleStick component </h2>

        <chart type="StockChart" [options]="options3"></chart>
    `
})

export class HighChartsComponent {

    options3: Object;

    constructor(jsonp : Jsonp) {

        jsonp.request('https://www.highcharts.com/samples/data/jsonp.php?a=e&filename=aapl-ohlc.json&callback=JSONP_CALLBACK').subscribe(res => {
            this.options3 = {
                title : { text : 'CandleSticks' },
                rangeSelector : {
                    selected : 1
                },
                series : [{
                    type : 'candlestick',
                    name : 'CandleSticks',
                    data : res.json(),
                    dataGrouping : {
                    units : [
                        [
                            'week', // unit name
                            [1] // allowed multiples
                        ], [
                            'month',
                            [1, 2, 3, 4, 6]
                        ]
                    ]
                },
                    tooltip: {
                        valueDecimals: 2
                    }
                }]
            };

        });
}

编辑：

在您的情况下，您没有在订阅中设置图表选项。你应该这样设置-

        this._http.get('http://knowstack.com/webtech/charts_demo/data.json')
                .map(this.extractData)
                .subscribe((response) => {
                    this.options = {
                                    title : { text : 'knowstack' },
                                    series : [{
                                        name : 'knowstack',
                                        data : response.json()
                                    }]
                                };
                },
                (error) => {  
                    this.errorMessage = <any>error
                });

请注意 - 来自 knowstack 的数据仅适用于简单图表（不是烛台）

编辑 2：柱形图

请参考下面的配置。这是您可以使用柱形图的方法。

this.options1 = {
            title : { text : 'simple column chart' },
            series: [{
                type : 'column',
                data:  [["Maths",15],["Physics",16],["Biology",18],["Chemistry",19]]
            }]
        };

编辑 3：键值对 json 示例

import { Component }        from '@angular/core';
import { CHART_DIRECTIVES } from 'angular2-highcharts'; 

@Component({
    selector: 'my-app',
    directives: [CHART_DIRECTIVES],
    styles: [`
      chart {
        display: block;
      }
    `]
    template: `<chart [options]="options"></chart>`
})
class AppComponent {
    constructor() {
        var data = [{"key":"Math","value":98},{"key":"Physics","value":78},{"key":"Biology","value":70},{"key":"Chemistry","value":90},{"key":"Literature","value":79}];

        this.options = {
            title : { text : 'simple chart' },
            xAxis: {
                type: 'category'
            },
            series: [{
                data: data.map(function (point) {
                    return [point.key, point.value]; 
                })
            }]
        };
    }
    options: Object;
}
于 2016-08-16T10:21:11.890 回答
1

好的，这是工作。我在第一篇文章中使用了服务，我只是更改了组件：constructor(http: Http, jsonp : Jsonp, DataService:DataService) { DataService.getData().subscribe(res => this.result = res); http.request('').subscribe(res => { this.options = { chart: { type: 'column' }, plotOptions: { column: { zones: [{ value: 12, },{ color: 'red' }] } }, series: [{ data: this.result }] }; }); } options: Object;

在这种情况下，json数据：[{"key":"Math","value":98},{"key":"Physics","value":78},{"key":"Biology","value":70},{"key":"Chemistry","value":90},{"key":"Literature","value":79}]

我怎样才能像那里一样拆分这些数据http://www.knowstack.com/webtech/charts_demo/highchartsdemo4.html

于 2016-08-18T12:51:35.253 回答