Pause horizontal scrolling in chart.js for real time data

问题

I am working on chart.js plugin with real time chart so i want to pause scrolling chart but when i calling pause dynamically its not working.

pausestart:boolean;

plugins: {
      streaming: {
          onRefresh: function(chart: any) {
            chart.data.datasets.forEach(function(dataset: any) {
              dataset.data.push({
                x: Date.now(),
                y: Math.random()
              });
            });
          },
          duration: 12000,
          refresh: 100,
          delay: 1000,
          frameRate: 60,
          pause: this.pausestart
        }
      }

i am setting pausestartinitially false after click on pause button set it to true

pause() {
    this.pausestart = true;
  }

  start() {
    this.pausestart = false;
  }

how can i resolve this issue.

回答1:

You can get a BaseChartDirective using @ViewChild, then use the chart property to set the pause option and call update().

import { Component, ViewChild } from '@angular/core';
import { BaseChartDirective } from 'ng2-charts';

export class AppComponent {
  @ViewChild(BaseChartDirective) chart: BaseChartDirective;

  pause() {
    this.chart.chart.options.plugins.streaming.pause = true;
    this.chart.chart.update({duration: 0});
  }

  start() {
    this.chart.chart.options.plugins.streaming.pause = false;
    this.chart.chart.update({duration: 0});
  }

  ...

来源：https://stackoverflow.com/questions/51078798/pause-horizontal-scrolling-in-chart-js-for-real-time-data