Using Angular 2 with Material design lite

Question

This has been asked in few of the previous posts. I am able to make it work in a certain way, but I am no able to make it work this way.

Referring to this

MaterialDesignLiteUpgradeElement.ts

import {Directive, ElementRef} from 'angular2/core';
declare var componentHandler;

@Directive({
    selector: '[mdl]'
})
export class MDL {

    constructor() {
        componentHandler.upgradeAllRegistered();
    }
}

PrivateServersComponent.ts

import {Component} from 'angular2/core';
import {MDL} from '../../directives/MaterialDesignLiteUpgradeElement';

declare var componentHandler:any;
@Component({
    selector: 'private-server',
    templateUrl: 'app/components/private-server/privateServer.html',
    directives: [MDL],
    styleUrls: ['app/components/private-server/styles/private-server.css']
})
export class PrivateServersComponent{ 
constructor(private _privateServerService: PrivateServerService, el:ElementRef) {

        this.element =el;
    }
}

privateServer.html

<div mdl style="margin: auto; top:40px; position:relative; display:inline-block;">
<table class="mdl-data-table mdl-js-data-table mdl-shadow--2dp" id="list_private_servers">
    <thead align="">
    <tr>
        <th> Private Server IP</th>
        <th> Host ID</th>
        <th> Number of Video workers</th>
        <th> Number of PDF workers</th>
        <th> Switch </th>
    </tr>
    </thead>
    <tbody>
        <tr *ngFor="#privateServer of privateServers"> <!-- some logic based on my service
            <td>
                1
            </td>
            <td>
                2
            </td>
            <td>
                3
            </td>
            <td>
                  4
            </td>
            <td>
                <div id="switch_public" class="material-icons" (click)="privateToPublic(privateServer.server_ip)">undo</div>
                <div class="mdl-tooltip  mdl-tooltip--large" for="switch_public">
                    <strong>Switch to Public Server</strong>
                </div>
            </td>
        </tr>
        <tr *ngIf="newEntry == 1">
            <td>
                <div class="mdl-textfield mdl-js-textfield millvi-half-width">
                    <input class="mdl-textfield__input" type="text" id="private_sever_ip" [(ngModel)]="newServer.ip">
                    <label class="mdl-textfield__label" for="private_sever_ip">IP</label>
                </div>
            </td>
            <td>
                <div class="mdl-textfield mdl-js-textfield millvi-half-width">
                    <input class="mdl-textfield__input" type="text" pattern="-?[0-9]*(\.[0-9]+)?" id="host_id" [(ngModel)]="newServer.id_host">
                    <label class="mdl-textfield__label" for=host_id>Host ID</label>
                    <span class="mdl-textfield__error">Not a valid host id!</span>
                </div>
            </td>
            <td>
                <div class="mdl-textfield mdl-js-textfield millvi-half-width">
                    <input class="mdl-textfield__input" type="text" pattern="-?[0-9]*(\.[0-9]+)?" id="video_workers" [(ngModel)]="newServer.video_workers">
                    <label class="mdl-textfield__label" for="video_workers">Video Workers</label>
                    <span class="mdl-textfield__error">Not Valid number of workers!</span>
                </div>
            </td>
            <td>
                <div class="mdl-textfield mdl-js-textfield millvi-half-width">
                    <input class="mdl-textfield__input" type="text" pattern="-?[0-9]*(\.[0-9]+)?" id="pdf_workers" [(ngModel)]="newServer.pdf_workers">
                    <label class="mdl-textfield__label" for="pdf_workers">PDF Workers</label>
                    <span class="mdl-textfield__error">Not Valid number of workers!</span>
                </div>
            </td>

        </tr>

    </tbody>


</table>

</div>

The UI is not rendered properly. And I get the following error message

EXCEPTION: Cannot resolve all parameters for 'PrivateServersComponent'(PrivateServerService, undefined). Make sure that all the parameters are decorated with Inject or have valid type annotations and that 'PrivateServersComponent' is decorated with Injectable.

It works correctly without directives:[mdl] and adding a componentHandler.upgradeAllRegistered()

EDIT

I made changes to the constructor as the following

constructor(private _privateServerService: PrivateServerService) {
    }

and it works fine.

However, I get the following errors:

EXCEPTION: TypeError: l is null
BrowserDomAdapter</BrowserDomAdapter.prototype.logError() angular2.dev.js:22911
BrowserDomAdapter</BrowserDomAdapter.prototype.logGroup() angular2.dev.js:22922
ExceptionHandler</ExceptionHandler.prototype.call() angular2.dev.js:1182
PlatformRef_</PlatformRef_.prototype._initApp/</<() angular2.dev.js:12562
NgZone</NgZone.prototype._notifyOnError() angular2.dev.js:13485
NgZone</NgZone.prototype._createInnerZone/errorHandling<.onError() angular2.dev.js:13389
u</e.prototype.run() angular2-polyfills.min.js:1
NgZone</NgZone.prototype._createInnerZone/<.$run/<() angular2.dev.js:13408
u</e.prototype.bind/<()

It works fine on initial loading, but when I switch tabs back to this one, it gives me this error.

I also tried to modify MaterialDesignLiteUpgradeElement as the following, but it doesn't work.

constructor(el:ElementRef) {
  componentHandler.upgradeElement(el.nativeElement);
}

Answer 1

To not get an error when you also add el:ElementRef to the constructor, you need to import ElementRef into the file

import {Component, ElementRef} from 'angular2/core';

Answer 2

Here's a full working plunker of Angular2 + Material Design Lite's implementation of the Android.dot.com template, if this helps anyone.

Plunker