Question

我有一个forkjoin，有2个通话。在html中，我需要等待forkjoin的响应到达。有什么方法可以使用async管道吗？我在另一篇文章中看到async仅适用于observables和promises。我尝试使用*ngIf来执行此操作，但是它不起作用。预先感谢

TS

var1: string;
var2: string;

 forkJoin(
   this.call1(),
   this.call2()
 ).subscribe(([res1, res2]) => {
   this.var1 = res1;
   this.var2 = res2;
   }, err => console.log(err));

HTML

<div class="col">
   <label class="labelEsp">Var 1:</label>
   <span class="spanEsp uppercase" >{{ var1 }}</span>
</div>
<div class="col">
    <label class="labelEsp"> Var 2:</label>
    <span class="spanEsp" >{{ var2 }}</span>
</div>

Answer 1

您可以继续使用typescript中的订阅，并使用标志在视图中隐藏和显示HTML。

类似的事情会做：

dataReady = false;
forkJoin(
   this.call1(),
   this.call2()
 ).subscribe(([res1, res2]) => {
   this.var1 = res1;
   this.var2 = res2;
   },
 (err) => console.log(err),
 () => {
    this.dataReady = true
    // complete block
  }
);

<ng-container *ngIf="dataReady else loading">
  <div class="col">
    <label class="labelEsp">Var 1:</label>
    <span class="spanEsp uppercase" >{{ var1 }}</span>
  </div>
  <div class="col">
      <label class="labelEsp"> Var 2:</label>
      <span class="spanEsp" >{{ var2] }}</span>
  </div>
</ng-container>

<ng-template #loading>
  loading...
</ng-template>

如果您想使用async管道本身进行操作，则可以使用以下内容：

data = forkJoin(
   this.call1(),
   this.call2()
 )


<ng-container *ngIf="data | async as resolvedData else loading">
  <div class="col">
    <label class="labelEsp">Var 1:</label>
    <span class="spanEsp uppercase" >{{ resolvedData[0] }}</span>
  </div>
  <div class="col">
      <label class="labelEsp"> Var 2:</label>
      <span class="spanEsp" >{{ resolvedData[1] }}</span>
  </div>
</ng-container>

<ng-template #loading>
  loading...
</ng-template>

在此处查看示例：https://stackblitz.com/edit/angular-uwpwya?file=src%2Fapp%2Fapp.component.html

等待forkjoin渲染html

1 个答案: