How can I check if an element is not undefined with a hidden-block in Angular HTML-CodePudding

how can I check if an element is not undefined with a hidden-block, i.e. how can I write the following code with a hidden-block

 <div  *ngIf="timeSlot.track">

I tried something like this

   <div  [hidden]="!timeSlot?.track">

but it's not the same.

I hope somebody can help.

THX

CodePudding user response：

In alternative you can try to use shorthand inside hidden directive:

<div  [hidden]="timeSlot.track === undefined ? true : false">

CodePudding user response：

In HTML File

<div  [hidden]="isHidden()">

isHidden() {
if(this.timeSlot.track === undefined) {
 return true;
}
return false;
}