What is the method for extracting a value from a variable using a template?

While some may find this basic, I am currently trying to figure it out.

I came across another post discussing ngIf else conditionals with templates: How to use *ngIf else?.

<div *ngIf="isValid;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>

My question revolves around how the template can interpret the condition and its value.

For example, using someObj.someProperty It should display the property if it exists, otherwise show a text message.

<div *ngIf="someObj.someProperty;then content else other_content">here is ignored</div>
  <ng-template #content>someObj.someProperty</ng-template>
  <ng-template #other_content>not specified</ng-template>

Just for your information: I'm utilizing https://stackblitz.com/

One might wonder why I choose to use that instead of my desktop environment.

The answer is simple - my machine is restricted, and I am currently seeking admin rights to install necessary software. So, in the meantime, I am learning coding basics with notepad and are unable to run any code.

Answer №1

In this scenario, I recommend avoiding the use of *ngIf.

You could try the following approach:

<div> {{ someObj?.someProperty || 'other content to render' }}</div>

When someObj?.someProperty is truthy (a non-empty string), it will be displayed, otherwise 'other content to render' will be shown.

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