javascript - 更改组件的模板 Angular 2

Question

我正在使用 mdl-select 组件。这是一个下拉列表。当您按下它时，将触发 focusin 事件。但是当您按下箭头下拉图标时它不会，所以我需要稍微更改模板以获得所需的行为。但它是一个库组件。有没有办法覆盖它的模板？

我需要更改的是将 tabindex=\"-1\" 添加到元素。我用js可以做到，但是我在app里用了很多component，不想每次用MdlSelectComponent都用document.getElement...我自己的组件的 View 。

我尝试在 MdlSelectComponent 类型上使用 @Component 装饰器函数，但是它需要再次声明此类，但无论如何都没有做任何事情。

更新

main.browser.ts

/*
 * Angular bootstraping
 */
import { Component } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { decorateModuleRef } from './app/environment';
import { bootloader } from '@angularclass/hmr';

import {MdlSelectComponent} from '@angular2-mdl-ext/select';
/*
 * App Module
 * our top level module that holds all of our components
 */
import { AppModule } from './app';

/*
 * Bootstrap our Angular app with a top level NgModule
 */
export function main(): Promise<any> {
  console.log(MdlSelectComponent)
  MdlSelectComponent.decorator.template = "<div class=\"mdl-textfield is-upgraded\" [class.is-focused]=\"this.popoverComponent.isVisible || this.focused\" [class.is-disabled]=\"this.disabled\" [class.is-dirty]=\"isDirty()\"> <span [attr.tabindex]=\"!this.disabled ? 0 : null\" (focus)=\"open($event);addFocus();\" (blur)=\"removeFocus()\"> <!-- don't want click to also trigger focus --> </span> <input #selectInput tabindex=\"-1\" [readonly]=\"!autocomplete\" class=\"mdl-textfield__input\" (click)=\"toggle($event)\" (keyup)=\"onInputChange($event)\" (blur)=\"onInputBlur()\" [placeholder]=\"placeholder ? placeholder : ''\" [attr.id]=\"textfieldId\" [value]=\"text\"> <span class=\"mdl-select__toggle material-icons\" (click)=\"toggle($event)\"> keyboard_arrow_down </span> <label class=\"mdl-textfield__label\" [attr.for]=\"textfieldId\">{{ label }}</label> <span class=\"mdl-textfield__error\"></span> <mdl-popover [class.mdl-popover--above]=\"autocomplete\" hide-on-click=\"!multiple\" [style.width.%]=\"100\"> <div class=\"mdl-list mdl-shadow--6dp\"> <ng-content></ng-content> </div> </mdl-popover> </div> ";

  return platformBrowserDynamic()
    .bootstrapModule(AppModule)
    .then(decorateModuleRef)
    .catch((err) => console.error(err));
}

// needed for hmr
// in prod this is replace for document ready
bootloader(main);

APP.COMPONENT.TS

import { Component, OnInit, ViewEncapsulation } from '@angular/core';
import { Router } from '@angular/router';
require('../../../styles/styles.scss');
import {MdlSelectComponent} from '@angular2-mdl-ext/select';
//
declare let Reflect: any;
Reflect.getOwnMetadata('annotations', MdlSelectComponent)[0].template = 'Hooray';
@Component({
    selector: 'app',
    encapsulation: ViewEncapsulation.None,
    styleUrls: [],
    template: `
        <div>
            <mdl-select [(ngModel)]="personId">
                <mdl-option *ngFor="let p of people" [value]="p.id">{{p.name}}</mdl-option>
            </mdl-select>
            <router-outlet></router-outlet>
        </div>`
})
export class AppComponent implements OnInit {
    constructor(
        router: Router,
    ) {
        router.events.subscribe(data => {
            scrollTo(0, 0);
        });
    }

    public ngOnInit() {
    }
}

Answer 1

由于 @angular2-mdl-ext/select 使用 Reflect 来定义装饰器，因此您可以执行以下操作

declare let Reflect: any;
Reflect.getOwnMetadata('annotations', MdlSelectComponent)[0].template = 'Hooray';

Plunker Example