Angular 6 If else statement 

<div *ngIf="condition statement;else other_content">
    content here ...
</div>

<ng-template #other_content>other content here...</ng-template>
you can also use then else :
<div *ngIf="condition statement;then content else other_content">here is ignored</div>    <ng-template #content>content here...</ng-template>
<ng-template #other_content>other content here...</ng-template>
or then alone :
<div *ngIf="condition statement;then content"></div>    <ng-template #content>content here...</ng-template>

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