Html Chart.js不以Angular2显示，如果它不显示'；在主页上不存在

每当我将图表转储到主app.component.html时，它看起来都很好，但当我在子组件中使用它并将应用程序路由到它时，图表就不会显示。在inspector窗口中，它将元素显示为具有0高度和0宽度。有人能解决这个问题吗

以下是我的app.component.ts的代码：

import {Component} from 'angular2/core';
import {RouteConfig, ROUTER_DIRECTIVES} from 'angular2/router';

import {HomeComponent} from './home.component';
import {ProfileComponent} from './profile.component';
import {HoursComponent} from './hours.component';
import {SettingsComponent} from './settings.component';
import {TaskComponent} from './task.component';
import {ChartDirective} from './chart.directive';


@Component({
    selector: 'track-me',
    templateUrl: 'app/app.component.html',
    directives: [ROUTER_DIRECTIVES,ChartDirective]    
})

@RouteConfig([
    { path: '/', component: HomeComponent, name: 'Home' },
    { path: '/home', component: HomeComponent, name: 'Home' },
    { path: '/profile', component: ProfileComponent, name: 'Profile' },
    { path: '/hours', component: HoursComponent, name: 'Hours' },
    { path: '/settings', component: SettingsComponent, name: 'Settings' },
    { path: '/task', component: TaskComponent, name: 'Task' },
])

export class AppComponent { }

import {Component} from 'angular2/core';
import {ChartDirective} from './chart.directive';
import {TopicsComponent} from './topics.component';

@Component({
    selector: 'home',
    templateUrl: 'app/home.component.html',
    directives: [TopicsComponent, ChartDirective]
})

export class HomeComponent { }

import {Component, DynamicComponentLoader, Injector} from 'angular2/core';
import {TopicsComponent} from './topics.component';
import {CanvasComponent} from './canvas.component';

@Component({
    selector: 'home',
    templateUrl: 'app/home.component.html',
    directives: [TopicsComponent, CanvasComponent]
})

export class HomeComponent { 
    constructor(dcl: DynamicComponentLoader, injector: Injector) {
        dcl.loadAsRoot(CanvasComponent, '#chartInsert', injector);
    }
}

以下是我的app.component.html代码：

<ul class="nav navmenu-nav">
    <li><a [routerLink]="['/Home']">Home</a></li> 
    <li><a [routerLink]="['/Profile']">Profile</a></li> 
    <li><a [routerLink]="['/Hours']">Set Hours</a></li> 
    <li><a [routerLink]="['/Settings']">Settings</a></li>
    <li><a [routerLink]="['/Task']">Completed Task</a></li>
</ul>

<router-outlet></router-outlet>
<canvas id="myChart" chart height="250" width="350"></canvas>

<div class="container details-container">
  <topics></topics>
</div>

<div class="graph-container">
    <div class="row no-pad" style="position: relative;">
        <div style="margin-left:14px; z-index: 100; height: 250px;">    
            <canvas id="myChart" chart height="250" width="350"></canvas>
        </div>  
        <div class="vaxis-bar"></div>
    </div><!--/row-->
    <div class="row">
        <div class="col-sm-12 text-center bottom-row">
            HOURS(9)
        </div>
    </div>
</div>

这是my home.component.html：

<ul class="nav navmenu-nav">
    <li><a [routerLink]="['/Home']">Home</a></li> 
    <li><a [routerLink]="['/Profile']">Profile</a></li> 
    <li><a [routerLink]="['/Hours']">Set Hours</a></li> 
    <li><a [routerLink]="['/Settings']">Settings</a></li>
    <li><a [routerLink]="['/Task']">Completed Task</a></li>
</ul>

<router-outlet></router-outlet>
<canvas id="myChart" chart height="250" width="350"></canvas>

<div class="container details-container">
  <topics></topics>
</div>

<div class="graph-container">
    <div class="row no-pad" style="position: relative;">
        <div style="margin-left:14px; z-index: 100; height: 250px;">    
            <canvas id="myChart" chart height="250" width="350"></canvas>
        </div>  
        <div class="vaxis-bar"></div>
    </div><!--/row-->
    <div class="row">
        <div class="col-sm-12 text-center bottom-row">
            HOURS(9)
        </div>
    </div>
</div>

小时（9）

最后，这是我的chart.directive.ts：

/// <reference path="../node_modules/chart.js/chart.d.ts" />

import {Directive, ElementRef, Renderer, Input} from 'angular2/core';
@Directive({
    selector: '[chart]'
})
export class ChartDirective {
    constructor(el: ElementRef, renderer: Renderer) {
        //el.nativeElement.style.backgroundColor = 'yellow';
        var data = {
            labels: ["", "", "", "", "", "", "", "", ""],
            datasets: [
                {
                    label: "Track Me",
                    fillColor: "rgba(220,220,220,0.2)",
                    strokeColor: "rgba(13,220,138,1)",
                    pointColor: "rgba(13,220,138,1)",
                    pointStrokeColor: "#fff",
                    pointHighlightFill: "#fff",
                    pointHighlightStroke: "rgba(220,220,220,1)",
                    data: [1, 3, 13, 7, 0, 5, 9, 2, 5]
                }
            ]
        };
        var opts = {
            pointDot: false, scaleFontColor: "#50728d", scaleShowLabels: true, responsive: false, scaleLineColor: "rgba(255,255,255,.3)"
        };

        var ctx: any = el.nativeElement.getContext("2d");
        var lineChart = new Chart(ctx);
        ////var lineChartOptions = areaChartOptions;
        ////lineChartOptions.datasetFill = false;
        lineChart.Line(data,opts);             

    }

}

//
从'angular2/core'导入{Directive，ElementRef，Renderer，Input}；
@指示({
选择器：“[图表]”
})
导出类图表指令{
构造函数（el:ElementRef，渲染器：渲染器）{
//el.nativeElement.style.backgroundColor='黄色'；
风险值数据={
标签：[、、、、、、、、、、、、、、、、、、]，
数据集：[
{
标签：“跟踪我”，
填充颜色：“rgba（220220,0.2）”，
strokeColor：“rgba（13220138,1）”，
pointColor:“rgba（13220138,1）”，
pointStrokeColor:“fff”，
pointHighlightFill:“fff”，
pointHighlightStroke:“rgba（2201）”，
数据：[1,3,13,7,0,5,9,2,5]
}
]
};
变量选项={
pointDot:false，scaleFontColor:#50728d，scaleShowLabels:true，responsive:false，scaleLineColor:“rgba（255255，.3）”
};
var ctx:any=el.nativeElement.getContext（“2d”）；
var线形图=新图表（ctx）；
////var lineChartOptions=区域图表选项；
////lineChartOptions.datasetFill=false；
线条图。线条（数据、选项）；
}
}

好的，下面是我解决问题的方法。我用canvas元素创建了一个新的canvas组件，并将我的chart指令导入到新组件中。之后，每当我创建主组件的实例时，我都使用DynamicComponentLoader类动态加载我的组件

新home.component.ts：

import {Component} from 'angular2/core';
import {RouteConfig, ROUTER_DIRECTIVES} from 'angular2/router';

import {HomeComponent} from './home.component';
import {ProfileComponent} from './profile.component';
import {HoursComponent} from './hours.component';
import {SettingsComponent} from './settings.component';
import {TaskComponent} from './task.component';
import {ChartDirective} from './chart.directive';


@Component({
    selector: 'track-me',
    templateUrl: 'app/app.component.html',
    directives: [ROUTER_DIRECTIVES,ChartDirective]    
})

@RouteConfig([
    { path: '/', component: HomeComponent, name: 'Home' },
    { path: '/home', component: HomeComponent, name: 'Home' },
    { path: '/profile', component: ProfileComponent, name: 'Profile' },
    { path: '/hours', component: HoursComponent, name: 'Hours' },
    { path: '/settings', component: SettingsComponent, name: 'Settings' },
    { path: '/task', component: TaskComponent, name: 'Task' },
])

export class AppComponent { }

import {Component} from 'angular2/core';
import {ChartDirective} from './chart.directive';
import {TopicsComponent} from './topics.component';

@Component({
    selector: 'home',
    templateUrl: 'app/home.component.html',
    directives: [TopicsComponent, ChartDirective]
})

export class HomeComponent { }

import {Component, DynamicComponentLoader, Injector} from 'angular2/core';
import {TopicsComponent} from './topics.component';
import {CanvasComponent} from './canvas.component';

@Component({
    selector: 'home',
    templateUrl: 'app/home.component.html',
    directives: [TopicsComponent, CanvasComponent]
})

export class HomeComponent { 
    constructor(dcl: DynamicComponentLoader, injector: Injector) {
        dcl.loadAsRoot(CanvasComponent, '#chartInsert', injector);
    }
}

New home.component.html

<div class="container details-container">
  <topics></topics>
</div>

<div class="graph-container">
    <div class="row no-pad" style="position: relative;">
        <div style="margin-left:14px; z-index: 100; height: 250px;" id="chartInsert">   
        </div>  
        <div class="vaxis-bar"></div>
    </div><!--/row-->
    <div class="row">
        <div class="col-sm-12 text-center bottom-row">
            HOURS(9)
        </div>
    </div>
</div>

小时（9）

新canvas.component.ts

import {Component} from 'angular2/core';
import {ChartDirective} from './chart.directive';

@Component({
    selector: 'canvas-component',
    template: '<canvas id="myChart" chart height="250" width="350"></canvas>',
    directives: [ChartDirective]
})

export class CanvasComponent { }

从'angular2/core'导入{Component}；
从“./chart.directive”导入{ChartDirective}；
@组成部分({
选择器：“画布组件”，
模板：“”，
指令：[图表指令]
})
导出类CanvasComponent{}

---

我希望这能帮助一些人。

关于ElementRef，Angular 2.0.0-beta.3出现了突破性的变化。不要在构造函数中使用ElementRef，你应该把ngOnInit看作是一个生命周期挂钩

我在Angular2 RC 4上，这对我很有用。谢谢我没有在构造函数中进行任何初始化，而是将其转移到ngOnInit函数中。