angular - *ngIf and *ngFor on same element causing error -


i'm having problem trying use angular's *ngfor , *ngif on same element.

when trying loop through collection in *ngfor, collection seen null , consequently fails when trying access properties in template.

@component({   selector: 'shell',   template: `     <h3>shell</h3><button (click)="toggle()">toggle!</button>      <div *ngif="show" *ngfor="let thing of stuff">       {{log(thing)}}       <span>{{thing.name}}</span>     </div>   ` })  export class shellcomponent implements oninit {    public stuff:any[] = [];   public show:boolean = false;    constructor() {}    ngoninit() {     this.stuff = [       { name: 'abc', id: 1 },       { name: 'huo', id: 2 },       { name: 'bar', id: 3 },       { name: 'foo', id: 4 },       { name: 'thing', id: 5 },       { name: 'other', id: 6 },     ]   }    toggle() {     this.show = !this.show;   }    log(thing) {     console.log(thing);   }  } 

i know easy solution move *ngif level scenarios looping on list items in ul, i'd end either empty li if collection empty, or lis wrapped in redundant container elements.

example @ plnkr.

note console error:

exception: typeerror: cannot read property 'name' of null in [{{thing.name}} in shellcomponent@5:12]

am doing wrong or bug?

angular2 doesn't support more 1 structural directive on same element.
workaround use <ng-container> element allows use separate elements each structural directive, not stamped dom.

<ng-container *ngif="show">   <div *ngfor="let thing of stuff">     {{log(thing)}}     <span>{{thing.name}}</span>   </div> </ng-container> 

<template> (<ng-template> in angular4) allows same different syntax confusing , no longer recommended

<template [ngif]="show">   <div *ngfor="let thing of stuff">     {{log(thing)}}     <span>{{thing.name}}</span>   </div> </template> 

Comments

Popular posts from this blog

get url and add instance to a model with prefilled foreign key :django admin -

css - Make div keyboard-scrollable in jQuery Mobile? -

ruby on rails - Seeing duplicate requests handled with Unicorn -