The Jquery .animate() function appears to have trouble animating the css top property

Hey there! I'm currently working on implementing a menu that slides down from the top of the page after scrolling to a specific point and remains fixed at the top of the browser. However, I've encountered an issue with the jquery animate function not functioning as expected. Interestingly, when I include an alert("hello") right after the animate function, it works perfectly fine. Here is the code for my function:

function header()
{
    var main = document.getElementById("main");
    var rect = main.getBoundingClientRect();
    var menu = document.getElementById("menuappear");

    var y = rect.top;

    if (y <= 5)
    {
        $("#menuappear").animate({top:"0px"}, 500);
    }

    else
    {
        $("#menuappear").animate({top:"-93px"}, 500);
    }
}

Here's my HTML structure:

<body onscroll="header()">
...


<div id="menuappear">
    <a href="index.html"><img class="logo" src="images/logo.png" /></a>
    <ul>
        <li><a onclick="scrolltop()">Home</a></li>
        <li><a href="index.html">What We Do</a></li>
        <li><a href="#">Our Work</a></li>
        <li><a href="#">About Us</a></li>
        <li><a href="#">Join Our Team</a></li>
        <li><a href="contact.html">Contact</a></li>
    </ul>
</div>

Furthermore, here is the corresponding CSS:

#menuappear{
    z-index: 1000000;
    position: fixed;
    top: -93px;
    width: 100%;
    height: 90px;
    background-color: #242424;
    margin: 0;
    padding: 0;
    border-bottom: 3px solid #49CBCD;
}

If you have any insights or suggestions on what might be causing this issue, please let me know. EDIT: The functionality seems to work intermittently and is not very responsive.

Answer №1

"When multiple animation methods are called on the same element, the subsequent animations are queued and will not begin until the previous one completes. When .stop() is used, the next animation in line will start immediately." - .stop() | jQuery API Doc


Instead of calling the animation multiple times with <body onscroll="header()">, which can cause a delay or malfunction, you can prevent queuing by setting the queue param to false on animate(). For example:

$("#menuappear").animate({top:"-93px"}, {duration: 500, queue: false});

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