每当我将图表转储到主 app.component.html 时似乎都很好,但是一旦我在子组件中使用它并将应用程序路由到它,图表就不会显示。在检查器窗口中,它将元素显示为具有 0 高度和 0 宽度。有人对此有解决方案吗?
这是我的 app.component.ts 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 { }
这是我的 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>
html 页面上的 canvas 元素将正常显示。但是,一旦我将它放入我的 home.component 中,它就不会显示。
这是我的 home.component.ts:
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 { }
这是我的 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;">
<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>
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);
}
}
最佳答案
好的,这就是我解决我遇到的问题的方法。我创建了一个只有 Canvas 元素的新 Canvas 组件,并将我的图表指令导入到新组件中。之后,每当我创建我的主组件实例时,我都使用 DynamicComponentLoader 类来动态加载我的组件。
新的 home.component.ts:
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);
}
}
新建 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>
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 { }
我希望这可以帮助到一些人。
关于html - 如果主页上不存在 Chart.js 则不会在 Angular2 中显示,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35322638/