JSON data with angular2-highcharts - json

Question

I want to create chart based on the JSON data.
I using angular2-highcharts my ChartsMain component looks like:
#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;
And my DataService looks:
#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);
}
}
My chart
Where is a problem, why is chart empty? How do I fill the chart with JSON data. JSON data must be in any specific format?

Answer 1

A candlestick chart is typically used to present the open, high, low and close price over a period of time..
Sample expected JSON format looks like this-
[
[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],
]
Here is sample component with candlestick highchart-
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
}
}]
};
});
}
EDIT:
In your case you are not setting chart options inside subscribe. You should set like this-
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
});
Please note - data from knowstack will only work with simple charts (not candlestick)
EDIT 2: column chart
Please refer below configuration. This is how you can use column chart.
this.options1 = {
title : { text : 'simple column chart' },
series: [{
type : 'column',
data: [["Maths",15],["Physics",16],["Biology",18],["Chemistry",19]]
}]
};
EDIT 3: sample of key-value pair json
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;
}

Answer 2

Ok it is work. I use service which in my first post, I just changed component: 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;
in this case json data: [{"key":"Math","value":98},{"key":"Physics","value":78},{"key":"Biology","value":70},{"key":"Chemistry","value":90},{"key":"Literature","value":79}]
How can I split this data like there http://www.knowstack.com/webtech/charts_demo/highchartsdemo4.html