# Transparent header until scroll down

**URL:** https://meta.discourse.org/t/transparent-header-until-scroll-down/143791
**Category:** Development
**Created:** [March 10, 2020, 10:56am UTC](https://meta.discourse.org/t/transparent-header-until-scroll-down/143791 "2020-03-10T10:56:38Z")
**Posts on this page:** 3
**Page:** 1

<div class="post-metadata">

### Author: ![Tim\_Jefferies](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/tim_jefferies/32/113296_2.png) [@Tim\_Jefferies](https://meta.discourse.org/u/Tim_Jefferies)
#### Post date: [March 10, 2020, 10:56am UTC](https://meta.discourse.org/t/transparent-header-until-scroll-down/143791/1 "2020-03-10T10:56:38Z")

</div>

I’d like to have the header be transparent when at the top of the page, and then when the user scrolls down it becomes white.

I tried adding this javascript code in the ‘edit CSS/HTML’ of the `</body>` section as follows:

```plaintext
<script>
// When the user scrolls down 100px from the top of the document, change background to white
$(document).ready(function($){
    $(function(){
        $(window).scroll(function(){
            if ($(this).scrollTop() > 100){
                document.getElementsByClassName("d-header").style.backgroundColor = "white";
                document.getElementsByClassName("d-header").style.boxShadow = "0 1px 8px rgba(0,0,0,0.18)";
            } else {
                document.getElementsByClassName("d-header").style.backgroundColor = "transparent";
                document.getElementsByClassName("d-header").style.boxShadow = "unset";
            }
        });
    });
});
</script>

```

This doesn’t seem to work though. Any ideas?

Ideally I’d like this change to happen at the same time as the page hits the #main-outlet and .d-header changes to a fixed position, but I don’t know how.

---

<div class="post-metadata">

### Author: ![Tim\_Jefferies](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/tim_jefferies/32/113296_2.png) [@Tim\_Jefferies](https://meta.discourse.org/u/Tim_Jefferies)
#### Post date: [March 12, 2020, 5:08am UTC](https://meta.discourse.org/t/transparent-header-until-scroll-down/143791/2 "2020-03-12T05:08:12Z")

</div>

I managed to get this working well enough.

js:

```plaintext
<script>

var dHeaderWhite = document.createElement('style');
dHeaderWhite.innerHTML = `
/*.docked. .d-header {
    position:fixed;
}*/
.d-header {
    background-color: white;
    box-shadow: 0 1px 8px rgba(0,0,0,0.18);
    -webkit-animation: fadein 0.5s;
    animation: fadein 0.5s;
}`;

var dHeaderTransparent = document.createElement('style');
dHeaderTransparent.innerHTML = `
/*.docked .d-header {
    position:absolute;
}*/
.d-header {
    background-color:transparent;
    box-shadow: unset;
    -webkit-animation: fadeout 0.5s;
    animation: fadeout 0.5s;
}`;

// When the user scrolls down the document, change from transparent background to white
$(document).ready(function($){
    $(function(){
        $(window).scroll(function(){
            
            if ($(".extra-info-wrapper")[0]) {
                // White if class exists
                document.head.appendChild(dHeaderWhite);
            } else if ($(this).scrollTop() > 150) { 
                // class doesn't exist but user has scrolled
                document.head.appendChild(dHeaderWhite);
            } else {
                // Transparent if class doesn't exist
                document.head.appendChild(dHeaderTransparent);
            }
        });
    });
});
</script>

```

css:

```plaintext
.d-header {
    background-color: transparent;
    box-shadow:unset;
}
.d-header-icons .d-icon {
    color: #9c9c9c;
}

```

I want the header to start off as scrollable and switched to fixed on scroll, but this doesn’t work yet. I’ll keep hacking away.

---

<div class="post-metadata">

### Author: ![system](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/system/32/443519_2.png) [@system](https://meta.discourse.org/u/system)
#### Post date: [March 1, 2024, 12:49pm UTC](https://meta.discourse.org/t/transparent-header-until-scroll-down/143791/3 "2024-03-01T12:49:12Z")

</div>