Dee Dee - 11 days ago 3
HTML Question

Navigation transition

I am new to jQuery and am teaching myself as I go but am struggling to figure out how to indicate that on up scroll the white navigation background moves up to show the white navigation text on panel 1?

bartaile.com is what I am using as inspiration & the changes I'm making to bartaile's navigation are---> after the user scrolls past the first panel the navigation hides, only when the user scrolls up does the navigation show again, when panel 1 comes back down the white navigation backgrouns slide up to hide and shows white text.

Any help or tips to learn how to do this would be greatly appreciated! :-)



var lastScrollTop = 0;
$(window).on('scroll', function() {
var header = $('.header');
var stage0 = $('.stage-0');
var scrollTop = $(window).scrollTop();
if (scrollTop > lastScrollTop) {
// down scroll
if (scrollTop > stage0.offset().top + stage0.height()) {
header.addClass('hide');
}
} else {
// up scroll
if (scrollTop <= stage0.offset().top + stage0.height()) {
header.removeClass('headerBGchange headerLIchange');

} else {
header.removeClass('hide').addClass('headerBGchange headerLIchange BGupTranistion');
}
}
lastScrollTop = scrollTop;
});

.header {
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-box-align: center;
-webkit-align-items: center;
-ms-flex-align: center;
align-items: center;
height: 80px;
-webkit-transition: top .5s ease;
transition: top .5s ease;
position: fixed;
width: 100%;
top: 0;
background-color: transparent;
overflow: hidden;
}

.header ul {
margin: 20px;
padding: 0;
}

.header ul li {
display: inline-block;
margin-right: 20px;
color: white;
}

.header ul li:last-child {
margin-right: 0;
}

.hide {
top: -80px;
}

.headerBGchange {
Background: white;
}

.BGupTranistion {
}

.header.headerLIchange ul li {
color: Blue;
}

.header.headerLIchange {
border-bottom: 1px solid black;
}'




</style>
<!--stage style--><style>

.stage {
color: #fff;
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-box-pack: center;
-webkit-justify-content: center;
-ms-flex-pack: center;
justify-content: center;
-webkit-box-align: center;
-webkit-align-items: center;
-ms-flex-align: center;
align-items: center;
height: 100vh;
background-color: white;
border-bottom: 1px solid black;
font-size: 48px;
height: 200px;
width: 100%;

}

.stage-0 {
background: grey;
}

.stage-24 {
background: #433937;
}

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<div class="header">
<ul>
<li>Home</li>
<li>About</li>
<li>Contact</li>
</ul>
</div>
<div class="stage stage-0">1</div>
<div class="stage stage-2">3</div>
<div class="stage stage-4">5</div>
<div class="stage stage-6">7</div>
<div class="stage stage-8">9</div>
<div class="stage stage-10">11</div>
<div class="stage stage-12">13</div>
<div class="stage stage-14">15</div>
<div class="stage stage-16">17</div>
<div class="stage stage-18">19</div>
<div class="stage stage-20">21</div>
<div class="stage stage-22">23</div>




Answer

You will need to add another container to achieve the effect you're looking for. What you essentially want to have is a container at the top and another container which will fade in and out depending on your scroll behaviour. So how do you achieve that? Create a -Element on top of the page, like your gray box is there at the moment. When scrolling down, do not transform it, instead, fade in another previously hidden container to act as your navigation when not at the top of the page. Now if you scroll back up, check the scroll location, and if the two locations of both containers overlap, start fading out the container you use when not at the top of the page. I do not think there is another solution. I might try and write a codepen on it now, I will edit my post if I had success. You could also try working it out with another div inside the actual header and z-index, though that might turn out really bad.

I have done my best to achieve what you want. Here is the CodePen. I used two different divs, one called .dynamic-header and one normal header, and I've added a function to detect jQuery In-Viewport.

$.fn.isOnScreen = function(){
    var element = this.get(0);
    var bounds = element.getBoundingClientRect();
    return bounds.top < window.innerHeight && bounds.bottom > 0;
}

I hope this fits your needs. Also, I changed some CSS around, using the Top-Property for the transition. You can outsource all of that into CSS classes and use them instead, but I thought this was the simplest solution for demonstration purposes. Is this what you want?

Edit 1: You named bartaile.com as an example. I took a look at the effect they create and recreated it. What you have to do is basically create a structure like this:

<div class="header-bg"></div>
    <div class="header-content">
      <ul>
        <li>YOUR HEADER</li>
      </ul>
    </div>

I made another CodePen for this. The header-bg has a height of 0. The header-content has a height of, lets say, 80px, and a background-color of transparent. Now do NOT check which direction is scrolled. The only important aspect for the effect is, how far are you from the top / is a specific element in viewport? I went for 400px from top. Now when that requirement is met, just fade in the header-bg. It will be inbetween the wrapper and the content, and will provide a background. Together with that, you may also change the color of the header-content, but I did not do that. It is what bartaile.com does, tho, so you might want to include it. Enjoy!

Edit 2: I've edited the CodePen according to your comment. See it in action here. This does the following: A header is there. When scrolling down, it'll disappear. On scroll up, it'll bring up a background, but when scrolling so that scrollTop < 400, the background will fade out. As of what I understood, this is what you want. It uses the structure I posted above.

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