Tips for effectively managing Navbar color adjustment while scrolling in Angular?

Question

Tips for effectively managing Navbar color adjustment while scrolling in Angular?

I'm currently working on an Angular project and I am looking to incorporate a navbar with a transparent background that changes color when scrolled. I am utilizing bootstrap classes for this particular task.

The HTML code for my Navbar heading is as follows:

<nav class="navbar navbar-expand-md sticky-top">
    ...
</nav>

I would like to know where exactly should I insert my script in order to alter its color upon scrolling.

css angular bootstrap-4

Answer 1

Answer №1

To implement this functionality, you can utilize the @HostListner feature within your Typescript file.

import { HostListener } from @angular/core;

@HostListener('window:scroll', ['$event'])

onWindowScroll() {
    let element = document.querySelector('.navbar') as HTMLElement;
    if (window.pageYOffset > element.clientHeight) {
      element.classList.add('navbar-inverse');
    } else {
      element.classList.remove('navbar-inverse');
    }
  }

Integrate the scroll event on the HTML section.

<nav class="navbar navbar-expand-md sticky-top" (scroll)="onWindowScroll();"></nav>

Answer 2

To implement this functionality, you can utilize the @HostListner feature within your Typescript file.

import { HostListener } from @angular/core;

@HostListener('window:scroll', ['$event'])

onWindowScroll() {
    let element = document.querySelector('.navbar') as HTMLElement;
    if (window.pageYOffset > element.clientHeight) {
      element.classList.add('navbar-inverse');
    } else {
      element.classList.remove('navbar-inverse');
    }
  }

Integrate the scroll event on the HTML section.

<nav class="navbar navbar-expand-md sticky-top" (scroll)="onWindowScroll();"></nav>

Answer 3

Answer №2

$(function () {
  $(document).scroll(function () {
  var $nav = $(".navbar-fixed-top");
  $nav.toggleClass('scrolled', $(this).scrollTop() > $nav.height());
});
});

@import "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/css/bootstrap.min.css";

body {
  padding-top: 70px;
  background: #ddd;
}

.navbar-fixed-top.scrolled {
  background-color: #fff !important;
  transition: background-color 800ms linear;
}

.navbar-fixed-top.scrolled .nav-link {
  color:#555;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<header>
<nav id="navigation" class="navbar navbar-dark bg-primary navbar-fixed-top">
<ul class="nav navbar-nav">
<li class="nav-item"><a href="#" class="nav-link">Home</a></li>
<li class="nav-item"><a href="#projects" class="nav-link">Teams</a></li>
<li class="nav-item"><a href="#blog" class="nav-link">Service</a></li>
<li class="nav-item"><a href="#contact-us" class="nav-link">Contact us</a></li>
</ul>
</nav>
</header>

<h1>Folow</h1>

<p>
  "But I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system, and expound the actual teachings of the great explorer of the truth, the master-builder of human happiness. No one rejects, dislikes, or avoids pleasure itself, because it is pleasure, but because those who do not know how to pursue pleasure rationally encounter consequences that are extremely painful. Nor again is there anyone who loves or pursues or desires to obtain pain of itself, because it is pain, but because occasionally circumstances occur in which toil and pain can procure him some great pleasure. To take a trivial example, which of us ever undertakes laborious physical exercise, except to obtain some advantage from it? But who has any right to find fault with a man who chooses to enjoy a pleasure that has no annoying consequences, or one who avoids a pain that produces no resultant pleasure?"
</p>

You Can View the Code Here: See Code Example

Answer 4

$(function () {
  $(document).scroll(function () {
  var $nav = $(".navbar-fixed-top");
  $nav.toggleClass('scrolled', $(this).scrollTop() > $nav.height());
});
});

@import "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/css/bootstrap.min.css";

body {
  padding-top: 70px;
  background: #ddd;
}

.navbar-fixed-top.scrolled {
  background-color: #fff !important;
  transition: background-color 800ms linear;
}

.navbar-fixed-top.scrolled .nav-link {
  color:#555;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<header>
<nav id="navigation" class="navbar navbar-dark bg-primary navbar-fixed-top">
<ul class="nav navbar-nav">
<li class="nav-item"><a href="#" class="nav-link">Home</a></li>
<li class="nav-item"><a href="#projects" class="nav-link">Teams</a></li>
<li class="nav-item"><a href="#blog" class="nav-link">Service</a></li>
<li class="nav-item"><a href="#contact-us" class="nav-link">Contact us</a></li>
</ul>
</nav>
</header>

<h1>Folow</h1>

<p>
  "But I must explain to you how all this mistaken idea of denouncing pleasure and praising pain was born and I will give you a complete account of the system, and expound the actual teachings of the great explorer of the truth, the master-builder of human happiness. No one rejects, dislikes, or avoids pleasure itself, because it is pleasure, but because those who do not know how to pursue pleasure rationally encounter consequences that are extremely painful. Nor again is there anyone who loves or pursues or desires to obtain pain of itself, because it is pain, but because occasionally circumstances occur in which toil and pain can procure him some great pleasure. To take a trivial example, which of us ever undertakes laborious physical exercise, except to obtain some advantage from it? But who has any right to find fault with a man who chooses to enjoy a pleasure that has no annoying consequences, or one who avoids a pain that produces no resultant pleasure?"
</p>

You Can View the Code Here: See Code Example

Answer 5

Answer №3

Describing a scroll event is as simple as defining an onscroll attribute, for example:

<nav class="navbar navbar-expand-md sticky-top" onscroll="detectScroll()">

Now let's create the function detectScroll. Scroll events happen continuously and the challenge lies in detecting when the scrolling has stopped. One way to achieve this is by using setInterval:

var scrollInterval = undefined;
var lastScroll = false;
function detectScroll() {
    lastScroll = true;
    if (!scrollInterval) {
        // Scrolling has started, perform some action
        lastScroll = false;
        scrollInterval = setTimeout(function() {
            if (!lastScroll) {
                // Scrolling has ended, revert back to original state
                scrollInterval = clearInterval(scrollInterval);
            }
            lastScroll = false;
        }, 100);
    } else {
        lastScroll = true;
    }
}

Answer 6

Describing a scroll event is as simple as defining an onscroll attribute, for example:

<nav class="navbar navbar-expand-md sticky-top" onscroll="detectScroll()">

Now let's create the function detectScroll. Scroll events happen continuously and the challenge lies in detecting when the scrolling has stopped. One way to achieve this is by using setInterval:

var scrollInterval = undefined;
var lastScroll = false;
function detectScroll() {
    lastScroll = true;
    if (!scrollInterval) {
        // Scrolling has started, perform some action
        lastScroll = false;
        scrollInterval = setTimeout(function() {
            if (!lastScroll) {
                // Scrolling has ended, revert back to original state
                scrollInterval = clearInterval(scrollInterval);
            }
            lastScroll = false;
        }, 100);
    } else {
        lastScroll = true;
    }
}

Tips for effectively managing Navbar color adjustment while scrolling in Angular?

Answer №1

Answer №2

Answer №3

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