Bre*_*ett 3 angular angular-changedetection
我有两个组件,它们都设置为OnPush. 父组件集accountLoading为true,一旦getAccount()被调用,然后设置accountLoading为false,一旦完成呼叫。正如预期的那样,控制台输出:
this.accountLoading 真
其次是:
this.accountLoading 假
然而模板没有更新,并且一直认为这accountLoading是真的。当值发生变化时,如何让模板按预期更新?我想将更改检测保留为 OnPush。
父组件:
打字稿:
public accountLoading: boolean;
...
getAccount() {
this.accountLoading = true;
this.authStore
.pipe(select(fromAuthStore.getAccountData))
.subscribe(account => {
if (account) {
this.accountLoading = false;
}
console.log('this.accountLoading', this.accountLoading);
});
// Loading account if it hasn't yet been loaded
this.authService.getAccount();
}
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HTML:
<child-component
[accountLoading]="accountLoading">
</child-component>
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子组件:
打字稿:
@Input() accountLoading: boolean;
...
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HTML:
<p *ngIf="accountLoading">
Loading...
</p>
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尝试行为主题
public accountLoading$: BehaviorSubject<boolean>(false);
...
getAccount() {
this.accountLoading$.next(true);
this.authStore
.pipe(select(fromAuthStore.getAccountData))
.subscribe(account => {
if (account) {
this.accountLoading$.next(false);
}
});
// Loading account if it hasn't yet been loaded
this.authService.getAccount();
}
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并在模板中使用异步管道
<p *ngIf="accountLoading$ | async">
Loading...
</p>
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我已经编写了一个库来为您处理很多此类状态管理,https://github.com/adriandavidbrand/ngx-rxcache。在这里阅读一下https://medium.com/@adrianbrand/angular-state-management-with-rxcache-468a865fc3fb
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