What is ngIf directive in Angular?

Angular is a popular JavaScript framework used for building dynamic web applications. One of the important features of Angular is its ability to handle conditional rendering of elements in the HTML template. This is where the ngIf directive comes into play.

The ngIf directive is used to conditionally render a portion of the HTML template based on a certain condition. It evaluates an expression and if the result is true, it renders the associated HTML markup. If the result is false, it removes the markup from the DOM.

Here’s an example of how the ngIf directive is used in an Angular template:

        
            <div *ngIf="isLoggedIn">
                <p>Welcome, User!</p>
            </div>
        
    

In the above example, the paragraph element will only be rendered if the isLoggedIn variable is true. If the variable is false, the paragraph element will not be included in the DOM.

The ngIf directive is a powerful tool for controlling the visibility of elements in an Angular application. It allows developers to easily show or hide elements based on specific conditions, providing a more dynamic and interactive user experience.

Overall, the ngIf directive in Angular is a fundamental feature that enables developers to create more responsive and user-friendly web applications.