javascript - Changing a div opacity on scroll - Stack Overflow|Programmer puzzle solving

I have looked through various pages, but have not managed to find a working solution. I want the text in my div to get more transparent gradually when I scroll. Please, can anybody help? Here is my code:

<script src = "/js/titleScroll.js"></script>
<div class = "header-title">


    <h1>Title</h1>
    </div>

and:

$(document).ready(function() {
  $(window).scroll(function() {
    if ($(this).scrollTop() > 0) {
      $('header-title').css('opacity', 0.8);
    } else {
      $('header-title').css('opacity', 1);
    }
  });
});

and here is my css:

.header-title {
width: 80%;
height: 100px;
left: 50%;
top: 50%;
font-size: 1.5em;   
text-align: center;
transform: translateX(-50%); 
margin-top: -50px;
position: relative;
max-width: 100%;
background-attachment: fixed;
position: float;

}

.header-title h1 {
    color: white;
    text-shadow: 2px 2px 4px #d1d1d1;
    font-family: arial, sans-serif;
    white-space: nowrap;
    text-transform: uppercase;
    display: inline-block;


}

Thank you.

<script src = "/js/titleScroll.js"></script>
<div class = "header-title">


    <h1>Title</h1>
    </div>

and:

$(document).ready(function() {
  $(window).scroll(function() {
    if ($(this).scrollTop() > 0) {
      $('header-title').css('opacity', 0.8);
    } else {
      $('header-title').css('opacity', 1);
    }
  });
});

and here is my css:

.header-title {
width: 80%;
height: 100px;
left: 50%;
top: 50%;
font-size: 1.5em;   
text-align: center;
transform: translateX(-50%); 
margin-top: -50px;
position: relative;
max-width: 100%;
background-attachment: fixed;
position: float;

}

.header-title h1 {
    color: white;
    text-shadow: 2px 2px 4px #d1d1d1;
    font-family: arial, sans-serif;
    white-space: nowrap;
    text-transform: uppercase;
    display: inline-block;


}

Thank you.

Share Improve this question asked May 20, 2018 at 16:07 SimplySnap 291 silver badge6 bronze badges

Try $('html,body').scroll(). – deEr. Commented May 20, 2018 at 16:11
I replaced $(window).scroll(function() with $('html,body').scroll(function() but sadly nothing. (The bracket is closed off later.) – SimplySnap Commented May 20, 2018 at 16:28
Oh. You have a . missing. $(.header-title). – deEr. Commented May 20, 2018 at 16:30

Add a ment |

1 Answer 1

Sorted by: Reset to default 3

Problem is, currently you are just triggering 0.8 opacity when user is not at top of the page. Try to get top offset each time scroll is executed and then apply opacity based on that offset, it can be linear function, or more plex ones - it's up to you how it's gonna fade in/out.

Here's very quick working example:

<head>
    <style>

    body {
        min-height: 4000px;
    }

    .header-title {
        position: fixed;
        width: 80%;
        height: 100px;
        left: 50%;
        top: 50%;
        font-size: 1.5em;
        text-align: center;
        transform: translateX(-50%);
        margin-top: -50px;
        max-width: 100%;
        background-attachment: fixed;
    }

    .header-title h1 {
        color: white;
        text-shadow: 2px 2px 4px #d1d1d1;
        font-family: arial, sans-serif;
        white-space: nowrap;
        text-transform: uppercase;
        display: inline-block;
    }

    </style>
    <script src="https://code.jquery./jquery-3.3.1.min.js"></script>
</head>
<body>
    <script>
    $(document).ready(function() {
        $(window).scroll(function(event) {
            let scroll = $(this).scrollTop();
            let opacity = 1 - (scroll / 1000);
            if (opacity >= 0) {
                $('.header-title').css('opacity', opacity);
            }
        });
    });
    </script>
    <div class = "header-title">
        <h1>Title</h1>
    </div>
</body>

https://jsfiddle/un2bdvfm/

Programmer puzzle solving

javascript - Changing a div opacity on scroll - Stack Overflow

1 Answer 1

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