How to get Facebook app open from browser in different scenarios

See more:

Javascript

HTML

PHP

Android

iOS

, +

I am developing a WordPress theme where a hyperlink (Facebook page) should take the user to Facebook app if installed or open a new tab if not installed.

here is the anchor/hyperlink:

<a id="facebook" class="social-btn facebook" title="Our Facebook Page" target="_blank" href="<?php echo esc_url( __( 'https://www.facebook.com/rainbowparentinguae' ) ); ?>">
    
</a>

and this is the JavaScript:

class FaceBook {

constructor() {
    this.FacebookBtn = document.getElementById("facebook");
    this.events();
}

events() {

    if (this.FacebookBtn) {
        this.FacebookBtn.addEventListener("click", this.openFacebook.bind(this));       
    }
}

openFacebook(e) {
    const IS_IOS = (navigator.userAgent.match(/iPad/i) != null) || (navigator.userAgent.match(/iPhone/i) != null) || (navigator.userAgent.match(/iPod/i) != null);
    const IS_ANDROID = (navigator.userAgent.match(/android/i) != null) || (navigator.userAgent.match(/Android/i) != null);


    if(IS_IOS) {
        setTimeout( function () { getURL(); }, 25);
        this.FacebookBtn.href = "fb://profile/1692101410811137";
    }

    else if (IS_ANDROID) {
        setTimeout( function () { getURL(); }, 25);
        this.FacebookBtn.href = "fb://page/1692101410811137";
    }

e.stopPropagation();
};

getURL() {
    location.href("https://www.facebook.com/rainbowparentinguae", '_blank' );
};
}

export default FaceBook;

I expect that if the user is using a computer (desktop/laptop) the Facebook page will open in new (windows/tab).

if the user is using iOS the page will open in Facebook App (if it is installed), in case the App is not there the Facebook page will be opened in a new (windows/tab).

if the user is using Android the page will open in Facebook App (if it is installed), in case the App is not there the Facebook page will be opened in a new (windows/tab).

What I have tried:

I have done some searches and developed a short code where everything is quite done except the scenario if Facebook App is not installed.