What is the best way to reach the top of an element that has padding?

An interactive jump menu allows users to navigate to different sections on the page by clicking on menu items. However, there seems to be an issue where the page scrolls to the top of the <h3> element instead of the entire element including any padding applied.

Question:

  • Is there a way to scroll directly to the top of an element with padding included?

Current Problem:

https://i.sstatic.net/NeNbf.png

Desired Outcome:

https://i.sstatic.net/U1zg5.png

Code

// JavaScript function to handle scrolling and menu interaction
$(function() {
  $(window).on('scroll', function() {
    $('.menu').addClass('menu--fixed');
  });
 $('.menu li a').on('click', function(evt) {
  var menuHeight = $('.menu').outerHeight(true);
  var elementOffset = ($(this).offset().top) - (menuHeight);
  $('html, body').stop().animate({
    scrollTop: elementOffset
  }, 2000);
  evt.preventDefault();
 });
});
.container {
max-width: 480px;
}
.heading {
padding: 32px;
background-color: #eee;
}
ul {
list-style: none;
}
.menu {
position: relative;
background-color: black;
color: white;
width: 100%;
display: flex;
justify-between: space-between;

}
.menu li {
display: block;
height: 100%;
}

.menu a {
color: white;
padding: 32px;
}

.menu--fixed {
position: fixed;
    top: 0;
    left: 0;
    margin-top: 0;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="container">
<div class="menu__wrapper">
<ul class="menu">
<li><a href="#el1">element 1</a></li>
<li><a href="#el2">element 2</a></li>
<li><a href="#el3">element 3</a></li>
</ul>
</div>
...

Answer №1

One issue that stands out is the use of this in the click handling function, which refers to the link element in the menu. This results in obtaining irrelevant offsets for your calculations, as it does not pertain to the actual <h3> element intended for scrolling.

Furthermore, why not consider keeping the menu fixed at all times if that is the desired behavior upon scrolling? Setting it to fixed during the initial scroll event can alter the layout of the container and disrupt spacing. In a sample scenario, relocating the menu outside the container and making it permanently fixed resolves this issue. Padding was added to the top of the .container element to ensure it displays below the fixed menu when scrollTop is 0 (during page load).

For identifying the target <h3> element based on the clicked menu item's href attribute, I located the corresponding <h3> element using its ID. Utilizing the real offset of the <h3> element in calculations yields the intended outcome.

Feel free to view my demonstration on CodePen: https://codepen.io/bdoughty2018/pen/MLvJOd

Answer №2

At the moment, there seems to be a gap between the top of your page and the menu. To ensure that the menu stays at the top, you must specify the top position when using position: fixed;. If you want the menu to always stick to the top, then make sure to use top: 0px;

Additionally, the menu may have a default margin-top set, which should also be removed.

.menu--fixed {
  position: fixed;
  top: 0;
  left: 0;
  margin-top: 0;
}

Once this is implemented, adjusting values in JavaScript to accommodate the menu height should become much easier. (Remember to remove margin-bottom as well).

$(document).ready(function(){
  $(window).on('scroll', function() {
    $('.menu').addClass('menu--fixed');
  });

  $('.menu a').click(function(e){
    e.preventDefault();
    // Get clicked anchor href.
    var anchorID = $(this).attr('href');
    // Get scroll position of the target location.
    var scrollDestination = $(anchorID).offset().top;
    // Consider menu height
    var finalScroll = scrollDestination - 
$('.menu').outerHeight(true);
    $('html, body').animate({
        scrollTop: finalScroll
    }, 2000);
  });  
});

Update: Javascript.

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