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Live Data Using Angular 4

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  • #15721

    I am trying to render a live CanvasJs chart using Angular 4. I can successfully render the chart and get my data from my api. However, I am struggling to update the chart with new data (every second).

    With all the documentation that I read you should render the chart every time you update the data. I am assuming that is what I am doing, but it isn’t working.

    Any help would be appreciated.

    Here is my code:

      ngOnInit() {
        let headers = new Headers();
        headers.append('Content-Type', 'application/json');
        let options = new RequestOptions({ headers: headers });
        let body = {
          "returnImmediately": true,
          "maxMessages": 1
        let chart = new CanvasJS.Chart("chartContainer-Australia", {
          title: {
            text: "Live Data"
          axisX: {
            title: "Axis X Title"
          axisY: {
            title: "Units"
          data: [{
            type: "line",
            dataPoints: this.tc1
        console.log('chart rendered');
        return Observable.concat(Observable.of(null), IntervalObservable.create(1000))
          .flatMap(() => this.http.post(this.dataUrl, JSON.stringify(body), options))
            (res: Response) => res.json()
            (res) => {
              // console.log("VALUE RECEIVED: ",res);
              if (res.receivedMessages){
                for (let i=0; i<res.receivedMessages.length; i++){
                  const data = atob(res.receivedMessages[i].message.data);
                  const dataParsed = JSON.parse(data);
                  const ack = res.receivedMessages[i].ackId;
                  this.dataArray.push({'sensorName': dataParsed.sensor['sensor-name'], 'value': dataParsed.sensor['value'], 'time': dataParsed.sensor['timestamp'], 'units': dataParsed.sensor['units']});
                  if (dataParsed.sensor['sensor-name'] == 'TC1') {
                    const temp = dataParsed.sensor['value'];
                    const time = dataParsed.sensor['timestamp'];
                    this.tc1.push({'y': temp, 'x': time});
                    console.log('tc1 chart rendered');
                    console.log('TC1: ', this.tc1);
            (x) => {
              /* this function is executed when there's an ERROR */
              console.log("ERROR: "+x);
            () => {
              /* this function is executed when the observable ends (completes) its stream */


    We are looking into the issue and will get back to you at the earliest.

    Bivek Singh,
    Team CanvasJS



    We are unable to reproduce the issue at our end. Please, look into this sample project created with your sample code. In case, if this still doesn’t solve your problem, sharing a sample project reproducing the issue will help us to understand your problem better and help you out.

    Sanjoy Debnath,
    Team CanvasJS

    • This reply was modified 5 years, 3 months ago by Sanjoy.


    We have just released v2.1 with module import/export with which you can easily integrate front-end framework like React, Angular, Vuejs, etc. Please refer to the release blog for more information. Do download the latest version from our download page and let us know your feedback.

    Indranil Deo,
    Team CanvasJS

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