chart.js - Change style of hover and tooltip in chartjs or ng2-charts -


is there way change style of hover tooltip chartjs or ng2-charts? want hide hover points , display them whenever hover on them along indicator line. here exact chart model want build:

https://interactive-bitcoin-price-chart-foxkmkynmg.now.sh/

thank in advance tips.

edit: followed instructions of grunt apply chart option angular app, full chart shown tooltip whenever hover, line-trace indicator not. here codes:

plugin-hoverline.ts:

export class pluginhoverline {    posx: null;    ismouseout:boolean = false;     drawline(chart, posx) {       const ctx = chart.ctx,          x_axis = chart.scales['x-axis-0'],          y_axis = chart.scales['y-axis-0'],          x = posx,          topy = y_axis.top,          bottomy = y_axis.bottom;       if (posx < x_axis.left || posx > x_axis.right) return;       // draw line       ctx.save();       ctx.beginpath();       ctx.moveto(x, topy);       ctx.lineto(x, bottomy);       ctx.linewidth = chart.options.lineonhover.linewidth;       ctx.strokestyle = chart.options.lineonhover.linecolor;       ctx.stroke();       ctx.restore();    };     beforeinit(chart) {       chart.options.events.push('mouseover');    };     afterevent(chart, event) {       if (!chart.options.lineonhover || !chart.options.lineonhover.enabled) return;       if (event.type !== 'mousemove' && event.type !== 'mouseover') {          if (event.type === 'mouseout') this.ismouseout = true;          chart.clear();          chart.draw();          return;       }       this.posx = event.x;       this.ismouseout = false;       chart.clear();       chart.draw();       this.drawline(chart, this.posx);        var metadata = chart.getdatasetmeta(0).data,          radius = chart.data.datasets[0].pointhoverradius,          posx = metadata.map(e => e._model.x);       posx.foreach(function(pos, posindex) {          if (this.posx < pos + radius && this.posx > pos - radius) {             chart.updatehoverstyle([metadata[posindex]], null, true);             chart.tooltip._active = [metadata[posindex]];          } else chart.updatehoverstyle([metadata[posindex]], null, false);       }.bind(this));       chart.tooltip.update();    };     afterdatasetsdraw(chart, ease) {       if (!this.posx) return;       if (!this.ismouseout) this.drawline(chart, this.posx);    }; }

banner.component.ts: (chart component)

import { component, oninit } '@angular/core'; import { historicalbpiservice } '../../services/historical-bpi.service'; import { pluginhoverline } './plugin-hoverline';  @component({   selector: 'app-banner',   templateurl: './banner.component.html',   styleurls: ['./banner.component.scss'] }) export class bannercomponent implements oninit {    private dataurl: string = 'historical/close.json';    constructor(     private historicalbpiservice:historicalbpiservice   ) {}    // linechart   public linechartdata:any = [     { data:[], label: 'bitcoin price' }   ];    public linechartlabels:array<any> = [];    public linechartoptions:any = {     responsive: true,     maintainaspectratio: false,     layout: {       padding: 0     },     lineonhover: {      enabled: true,      linecolor: '#bbb',      linewidth: 1    },     scales: {       yaxes: [{         display: true,         scalelabel: {           display: false,           labelstring: 'usd'         },         ticks: {           display: false         },         gridlines: {           display: true,           tickmarklength: 0         }       }],       xaxes: [{         ticks: {           display: false         },         gridlines: {           display: false,           tickmarklength: 0         }       }]     },     elements: {       point: {         radius: 3       },       line: {         tension: 0.4, // 0 disables bezier curves       }     },     hover: {       mode: 'nearest',       intersect: false     },     tooltips: {       mode: 'nearest',       intersect: false,       backgroundcolor: 'rgb(95,22,21)',       callbacks: {         label: function (tooltipitems, data) {           return data.datasets[tooltipitems.datasetindex].label + ' : ' + '$' + tooltipitems.ylabel.tolocalestring();         },         labelcolor: function(tooltipitem, chart) {           var dataset = chart.config.data.datasets[tooltipitem.datasetindex];           return {             backgroundcolor : dataset.backgroundcolor           }         }       }     }   };   public linechartcolors:array<any> = [     {       backgroundcolor: 'rgba(199,32,48,0.8',       bordercolor: 'rgb(95,22,21);',       pointbackgroundcolor: 'rgba(218,208,163,0.8)',       pointhoverbackgroundcolor: 'rgba(218,208,163,0.8)',       pointhoverbordercolor: 'rgb(218,208,163)',       pointhoverradius: 6,       steppedline: false      }   ];   public linechartlegend:boolean = false;   public linecharttype:string = 'line';     // events   public chartclicked(e:any):void {     console.log(e);   }    public charthovered(e:any):void {     console.log(e);   }    ngoninit(){     this.historicalbpiservice.getbpidata(this.dataurl)       .subscribe(         res => {           //this.linechartdata = object.keys(res.bpi).map(function (key) { return res.bpi[key];});           this.linechartdata[0].data = object.values(res.bpi);           this.linechartlabels = object.keys(res.bpi);           //console.log(this.linechartdata,this.linechartlabels);         }       )   } }

template:

<div class="chart">       <canvas basechart height="360px"         [datasets]="linechartdata"         [labels]="linechartlabels"         [options]="linechartoptions"         [colors]="linechartcolors"         [legend]="linechartlegend"         [charttype]="linecharttype"         (charthover)="charthovered($event)"         (chartclick)="chartclicked($event)"></canvas>     </div>

unfortunately there no built-in functionality yet. can use this chart plugin (once created own purpose) achieve goal.

to utilize plugin, set following option in chart­'s options config :

lineonhover: {    enabled: true,    linecolor: '#bbb',    linewidth: 1 }

also, make sure set following properties dataset :

pointradius: 0, pointhoverradius: 5, pointhoverbackgroundcolor: 'white'

see - live demo


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