I recently completed developing a client's website using Squarespace.
Now, I am looking to design a header that:
1) Initially has a transparent background upon the user's arrival on the page 2) Transitions to a solid background color and sticks to the top of the viewport as the user scrolls down.
Thank you in advance for your assistance!
If you're looking to implement a sticky header on your website, CSSTricks has provided a great example on how to achieve this (which is a common solution for this problem).
The basic idea behind this solution is to listen for the scroll event and determine when you reach a certain point on the page (this spot can be calculated programmatically if desired). Once you reach that point, you add a specific class to the header element that accomplishes the following:
Changes the header's color as per your design preference
Sets the header's positioning to either fixed with a specified top value or absolute with a designated top value (both solutions are commonly used)
!IMPORTANT! Using position: fixed is generally considered safer than using position:absolute, because position: fixed positions the element relative to the viewport. When using position:absolute, it will behave similarly only if there are no parent elements with a position:relative [for more details, refer to this link ]
An experimental CSS feature called position: sticky may also be used for achieving sticky behavior without additional JavaScript. This feature is still in development, indicated by the Experimental Badge on MDN.
https://css-tricks.com/scroll-fix-content/
A demo showcasing the code can also be found at http://codepen.io/chriscoyier/pen/AdaKr. Remember to scroll within the view box (class="wrap") and not the entire webpage.
To achieve the desired effect, you need to follow these steps.
Start by setting the position of your header in the CSS to fixed.
Next, adjust the transparency settings by adding something like opacity: 0.5. For more control over both color and transparency, consider using RGBA values like
background-color: rgba(255, 0, 0, 0.3)Finally, attach a scroll event handler using JavaScript. If jQuery is available, a simple implementation can be:
$("#header").scroll(myScrollHandler);
function myScrollHandler () {
if (window.pageYOffset > 50)
{
$("#header").fadeTo(200, 0.9);
}
else
{
$("#header").fadeTo(200, 0.3);
}
}
In this example, sample values are used for duration and opacity levels. The comparison checks the page offset against the number of pixels before the header becomes visible.
Summarizing, ensure your CSS includes:
#header {
position: fixed;
top: 0;
width: 100%;
background-color: rgba(255, 0, 0, 0.3);
}
In your HTML, include:
<script>
$("#header").scroll(myScrollHandler);
function myScrollHandler () {
if (window.pageYOffset > 50)
{
$("#header").fadeTo(200, 0.9);
}
else
{
$("#header").fadeTo(200, 0.5);
}
}
</script>
<div id="header">
Your header content
</div>
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