angular - ngIf 否则不工作

Question

一直报错

Can't bind to 'ngIfElse' since it isn't a known property of 'ul'.

我确定我在某个地方犯了一个愚蠢的错误，但找不到它。

<ul *ngIf="!finished; else elseBlock" id='time'>
  <li id='hour' class="chart"  data-percent="100"><span>{{hour}} </span></li>
  <li id='min' class="chart" data-percent="100"><span>{{minute}}</span></li>
  <li id='second' class="chart" data-percent="100"><span>{{second}}</span></li>
</ul>
<ng-template  #elseBlock>  <h4 id='time'>DONE</h4> </ng-template>

Answer 1

Angular 2 不支持 Esle，你有两个选择:

1:使用正例:

<ul *ngIf="!finished" id="time">
  <li id='hour' class="chart"  data-percent="100"><span>{{hour}} </span></li>
  <li id='min' class="chart" data-percent="100"><span>{{minute}}</span></li>
  <li id='second' class="chart" data-percent="100"><span>{{second}}</span</li>
</ul>
<h4 id="time" *ngIf="finished"> <!-- this -->
  DONE
</h4>

2:将您的应用更新为 Angular 4:

在 Linux/Mac 上:

npm install @angular/{common,compiler,compiler-cli,core,forms,http,platform-browser,platform-browser-dynamic,platform-server,router,animations}@latest typescript@latest --save 

在 Windows 上:

npm install @angular/common@latest @angular/compiler@latest @angular/compiler-cli@latest @angular/core@latest @angular/forms@latest @angular/http@latest @angular/platform-browser@latest @angular/platform-browser-dynamic@latest @angular/platform-server@latest @angular/router@latest @angular/animations@latest typescript@latest --save

If you rely on Animations, import the new BrowserAnimationsModule from @angular/platform-browser/animations in your root NgModule. Without this, your code will compile and run, but animations will trigger an error. Imports from @angular/core were deprecated, use imports from the new package import { trigger, state, style, transition, animate } from '@angular/animations';.

http://angularjs.blogspot.com/2017/03/angular-400-now-available.html