ngIf
is a built-in directive in Angular that allows you to conditionally render or remove an HTML element based on the value of an expression in your component.
The ngIf
directive takes an expression as its value, which should evaluate to a boolean. If the expression is true, the element is rendered. If the expression is false, the element is removed from the DOM.
Here's an example:
html<div *ngIf="isShown">Hello World!</div>
In this example, the ngIf
directive is used to conditionally render a div
element based on the value of the isShown
expression in the component's class. If isShown
is true, the div
element will be displayed. If isShown
is false, the div
element will be removed from the DOM.
You can also use the ngIf
directive with an else
clause to conditionally render an alternate element when the expression is false. For example:
html<div *ngIf="isShown; else notShown">Hello World!</div>
<ng-template #notShown><p>This element is shown when isShown is false</p></ng-template>
In this example, the else
clause is used to render a p
element when the isShown
expression is false. The #notShown
template reference variable is used to define the alternate element.
The ngIf
directive can be useful for conditionally rendering elements based on user interactions, form values, or other state changes in your application. It is a powerful tool for creating dynamic and responsive user interfaces.
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