Asked by: Ismelda Santoveña
asked in category: General Last Updated: 16th June, 2020

What is the use of * ngIf?

NgIf is an angular directive that is used to add an element subtree for true value of expression. NgIf is used as *ngIf="expression" . Here if "expression" value is either false or null, in both cases the element subtree will not be added to DOM.

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Also asked, why * is used in ngIf?

5 Answers. Asterisk syntax is a syntatic sugar for more wordy template syntax which directive expands to under the hood, you are free to use any of these options. The asterisk is "syntactic sugar". It simplifies ngIf and ngFor for both the writer and the reader.

Secondly, how do you use else in ngIf? To display a template when expression evaluates to false, use an else template binding as shown in the following example. The else binding points to an <ng-template> element labeled #elseBlock . The template can be defined anywhere in the component view, but is typically placed right after ngIf for readability.

Additionally, what is * ngIf?

Overview. The ngIf directive removes or recreates a portion of the DOM tree based on an {expression}. If the expression assigned to ngIf evaluates to a false value then the element is removed from the DOM, otherwise a clone of the element is reinserted into the DOM.

What is ngFor and ngIf?

Directives preceded with a * like *ngIf , *ngFor , and *ngSwitchCase are structural directives. Structural directives modify the DOM by adding or removing certain elements. If an element is removed, it is completely removed rather than just being hidden.

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