Sticky header scrolls out of view when scrolling horizontally - html

Question

I have a header that I would like to be sticky both during vertical and horizontal scroll. I would like it to be sticky due to the height of the header being dynamic(otherwise I could use fixed if I'm not mistaken).
I have played around with a fiddle with no success :(
https://jsfiddle.net/Viktor/39v0gzjh/22/
CSS:
html, body{
width:100%;
background-color:red;
opacity:0.9;
padding:0;
margin:0;
}
.header{
position:sticky;
top:0;
left:0;
background-color:gray;
height: 100px;
padding:0;
}
.container{
display: flex;
}
.child{
width: 120px;
min-width: 120px;
max-width: 120px;
border: 1px solid #D8D8D8;
background-color: white;
font-weight: bold;
word-wrap: break-word;
}
.bigdiv{
width:1000px;
height:1000px;
}
HTML:
<div class="header">
This is my sticky header
</div>
<div class="container">
<div class="child">
child1
</div>
<div class="child">
child2
</div>
<div class="child">
child3
</div>
<div class="child">
child4
</div>
<div class="child">
child5
</div>
<div class="child">
child6
</div>
<div class="child">
child7
</div>
<div class="child">
child8
</div>
<div class="child">
child9
</div>
<div class="child">
child
</div>
</div>
<div class="bigdiv">
Very long div
</div>

Answer 1

If you are using bootstrap, just add fixed-top class to your header:
<div class="header fixed-top">
This is my sticky header
</div>
Otherwise, with css, header position should be "position:fixed;" and its width "width: 100%;" and then place other page content below like this fiddle:
https://jsfiddle.net/s071hnxL/

Answer 2

A better approach would be set overflow-x: scroll; on your html.
This will solve the issue.
Note that sticky, by specification, will not work inside element with overflow.
This is a known issue
Hence, try using javascript in combination with position:fixed
$(window).scroll(function() {
if( $(this).scrollTop() > 0 ) {
$('.header').addClass('sticky');
} else {
$('.header').removeClass('sticky');
}
});
html,
body {
width: 100%;
background-color: red;
opacity: 0.9;
padding: 0;
margin: 0;
overflow-x: scroll;
}
.header {
width: 100%;
background-color: gray;
height: 100px;
padding: 0;
}
.sticky {
position:fixed;
top:0;
width: 100%;
left:0;
}
.pt-100{
padding-top: 100px;
}
.container {
display: flex;
}
.child {
width: 120px;
min-width: 120px;
max-width: 120px;
border: 1px solid #D8D8D8;
background-color: white;
font-weight: bold;
word-wrap: break-word;
}
.bigdiv {
width: 1000px;
height: 1000px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="header">
This is my sticky header
</div>
<div class="container">
<div class="child">
child1
</div>
<div class="child">
child2
</div>
<div class="child">
child3
</div>
<div class="child">
child4
</div>
<div class="child">
child5
</div>
<div class="child">
child6
</div>
<div class="child">
child7
</div>
<div class="child">
child8
</div>
<div class="child">
child9
</div>
<div class="child">
child
</div>
</div>
<div class="bigdiv">
Very long div
</div>

Answer 3

position: sticky is working fine. The reason that you're unable to see it's effect is because of the position applied on div(not the visible text) and the width of the div, which is taking up 100% of its parent's div, which in this case is body. So when you're scrolling horizontally, you're still inside the div, which is taking up the complete width space available.
Now if you want to view the content inside div.header irrespective of the scroll, modify its width as width: 100vw and it should work fine.
You can verify by setting the width of body to 140% and .header to be 100vw
All the best. Cheers!