Step-by-Step Tutorial: Displaying Loading Text in Child Components with Angular 4

Within my "event.component" file, I have a nested component (app-grouplist)

<div class="group-list">
<app-grouplist
[hasStarted]="started"
[hasEnded]="ended"
Displaying Loading Groups... </app-grouplist>
</div>

Upon the initial page load, the child component does not appear right away. My goal is to display the "Loading Groups..." message until the child component becomes visible.

Answer №1

Within the child component, utilize ng-content to showcase the parent model. Here is an example:

Parent Component

<app-grouplist [hasStarted]="started" [hasEnded]="ended">Loading Groups...</app-grouplist>

Child Component

<ng-content *ngIf="loading else loadedData"></ng-content>

<div *ngIf="loading" #loadedData>....content goes here...</div>

Remember to include a boolean variable called loading in your child component's typescript code.

Answer №2

Utilizing if/else conditions in templates using ngIf can be achieved like so:

<app-grouplist *ngIf="childrenReady; else loading"
    [hasStarted]="started"
    [hasEnded]="ended">
</app-grouplist>

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

To make this functionality work, a variable like childrenReady needs to be set up that signals when the children are ready to be displayed. This setup will show the app-grouplist component if childrenReady is true, and the content within the "#loading" template if it's false.

If the container component doesn't have access to or can't determine the status of the children, this logic could also be implemented within the child component instead.

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