angular - angular2-mdl expansion panel with *ngFor behaves incorrectly -


in component list of tasks showing in template following:

<mdl-expansion-panel-group>     <mdl-expansion-panel *ngfor="let task of tasks">         <mdl-expansion-panel-header>             <mdl-expansion-panel-header-list-content><h6>{{task.what_task}}</h6></mdl-expansion-panel-header-list-content>         </mdl-expansion-panel-header>         <mdl-expansion-panel-content>             <mdl-expansion-panel-body>                  <form [formgroup]="form">                      <!-- task -->                     <p>                         <mdl-textfield label="what task" type="text" formcontrolname="what_task" floating-label [ngmodel]="task.what_task"></mdl-textfield>                     </p>                       <!-- how -->                     <p>                         how perform?<br/>                         <mdl-radio value="daily" formcontrolname="how_often" mdl-ripple [ngmodel]="task.how_often">daily once</mdl-radio>                         <mdl-radio value="weekly" formcontrolname="how_often" mdl-ripple [ngmodel]="task.how_often">weekly once</mdl-radio>                     </p><br>                      <p>                         <button mdl-button (click)="updatetask(task, task.id)" [disabled]="!form.valid" mdl-button-type="raised" mdl-ripple mdl-colored="primary">submit</button>                     </p>                 </form>               </mdl-expansion-panel-body>         </mdl-expansion-panel-content>     </mdl-expansion-panel> </mdl-expansion-panel-group>

my idea here see tasks panels , can expand individual panel edit specific task.

there 2 problems facing here:

  1. with *ngfor iterate on task array fetched backend expansion panel loses it's natural behavior , able open panels (ideally 1 panel opened)

  2. as using ngmodel bind values received backend individual task getting expressionchangedafterithasbeencheckederror: expression has changed after checked. error. results in displaying last tasks properties in panel forms.

what doing wrong here? not correct way use expansion panels?

enter image description here


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