How do I implement directive (ng-template) in Angular? - html

Question

In my HTML file, I've duplicated the "elseBlock2". How do I implement directive (ng-template) to handle it?
<div class="col-2">
<ng-container *ngIf="item.isSuccess; else elseBlock2">
{{getSimplifiedSize(item.file.size)}}
</ng-container>
<ng-container *ngIf="item.progress; else elseBlock2">
{{item.progress}}%
<mat-progress-bar mode="determinate" color="primary" value={{item.progress}}></mat-progress-bar>
</ng-container>
</div>

Answer 1

Can work something like this?
<div class="col-2">
<ng-container *ngIf="(item.isSuccess || item.progress); else elseBlock2">
<ng-container *ngIf="item.isSuccess">
{{getSimplifiedSize(item.file.size)}}
</ng-container>
<ng-container *ngIf="item.progress">
{{item.progress}}%
<mat-progress-bar mode="determinate" color="primary" value={{item.progress}}></mat-progress-bar>
</ng-container>
</ng-container>
<ng-template #elseBlock2>
Your content
</ng-template>
</div>
Update:
If you want to display the elseBlock only when it's both not in progress and success you can do something like this:
<div class="col-2">
<ng-container *ngIf="item.isSuccess">
{{getSimplifiedSize(item.file.size)}}
</ng-container>
<ng-container *ngIf="item.progress">
{{item.progress}}%
<mat-progress-bar mode="determinate" color="primary" value={{item.progress}}></mat-progress-bar>
</ng-container>
<ng-container *ngIf="!item.progress && !item.isSuccess">
Your content
</ng-container>
</div>

Answer 2

You can use if then else with ternary operator to achieve else-if in Angular
<ng-container
*ngIf="item.isSuccess then successBlock; else (item.progress) ? progressBlock : elseBlock"
></ng-container>
<ng-template #successBlock>
{{ getSimplifiedSize(item.file.size) }}
</ng-template>
<ng-template #progressBlock>
{{ item.progress }}%
</ng-template>
<ng-template #elseBlock>
Error
</ng-template>
In else statement, instead of passing a template, do another conditional check with ternary operator and pass other two templates as values