Why won't my jQuery animate effect work?

Question

this is the html, all in the head:

    <script type="text/javascript"  src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
    <script type="text/javascript" src="jquery.js"></script>

where the 2nd is my js document!! The js document looks like this:

$(document).ready(function() {

    $("li").fadeTo(0, 0.6),

    $("li").mouseenter(function() {
        $(this).fadeTo(100, 1),
        $(this).animate({top: "-=20px"},"fast")
    });
    $("li").mouseleave(function() {
        $(this).fadeTo(100, 0.6),
        $(this).animate({top: "=20px"},"fast")
    });


});

The opacity works, but not the animation, what is wrong?

Answer 1

Your <li> elements need to have a position value of fixed , relative or absolute if you are animating the top CSS. Without it, the animation will still complete, but you won't see any visual effect in the browser.

 $(document).ready(function() { $("li").fadeTo(0, 0.6), $("li").mouseenter(function() { $(this).fadeTo(100, 1), $(this).animate({top: "-=20px"},"fast") }); $("li").mouseleave(function() { $(this).fadeTo(100, 0.6), $(this).animate({top: "=20px"},"fast") }); }); 

 li { position:absolute; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <ul> <li>Item 1</li> <li>Item 2</li> <li>Item 3</li> </ul>