Ultimate goal is to use nested ngFor's created dynamically. I try to create a series of drop-down menus, each depending on the previous one. The exact number of drop-down menus is unknown and created dynamically. Example:
<form [ngFormModel]="dropDownForm" (ngSubmit)="onSubmit()">
<div *ngFor="#nr of numberOfDropdowns">
<label>{{nr.name}}</label>
<select [ngFormControl]="dropDownForm.controls[i]">
<option *ngFor="#item of Dropdown[nr.id] | async" value="{{item.value}}">{{item.name}}</option>
</select>
</div>
<button type="submit">Submit</button>
</form>
The whole things fails at Dropdown[nr.id] which does not seem to work with async pipe. I played around a bit:
{{myAsyncObject | async}} //works
{{myAsyncObject['prop1'] | async}} //fails silently
{{myAsyncObject['prop1']['prop2'] | async}} // EXCEPTION: TypeError: Cannot read property 'prop2' of undefined in [null]
Any ideas on how to get this working?
OK, managed to solve it myself. Simply create a custom pipe and pass the parameters in. In my case:
import {Pipe, PipeTransform} from 'angular2/core';
@Pipe({
name: 'customPipe'
})
export class CustomPipe implements PipeTransform {
transform(obj: any, args: Array<string>) {
if(obj) {
return obj[args[0]][args[1]];
}
}
}
Then import:
import {CustomPipe} from '../pipes/custompipe'
@Component({
selector: 'mypage',
templateUrl: '../templates/mytemplate.html',
pipes: [CustomPipe],
directives: [CORE_DIRECTIVES, FORM_DIRECTIVES]
})
and use:
*ngFor="#obj of myAsyncObject | async | customPipe:'prop1':'prop2'"
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