Applying jQuery .animate() to elements without specifying position: absolute

My goal is to create a website where clicking on an image triggers a dropdown menu. The jQuery method I'm using is as follows:

function main() {
    $('#arrow').click(function() {
        $('.hidden').animate({
            top: '200px'
        }, 400);

        $('#arrow').animate({
            top: '400px'
        }, 400);

        $('#arrow').css("src", "uparrow.jpg");
    });
}

$(document).ready(main);

The current implementation works well for displaying the dropdown menu, but it covers up my page content in the process. Although this is acceptable, I am looking for a solution that smoothly pushes the entire page down below the expanded menu. My preference is to achieve this effect without having to set position: absolute; on all elements to enable smooth animation. Below are the CSS attributes of the menu and related elements for better understanding:

    /* Menu elements */

.hidden {
  z-index: -5;
  top: -50px;
  position: absolute;
}

#arrow {
  margin-left: auto;
  margin-right: auto;
  height: 50px;
  width: 50px;
  display: block;
}

#arrow-box {
  background-color: white; /* FOR NOW */
}

#dropdown {
  height: 300px;
  width: 100%;
  background-color: black;
}

To clarify the structure, here is a Stack Snippet:

 
// JavaScript code snippet goes here
....
....

 
/* CSS styling code goes here */
....
....

 
<!-- HTML code snippet goes here -->
....
....

Answer №1

Avoid animating a relatively positioned element to prevent frequent DOM recalculations during each step of the animation. This can lead to a poor user experience especially on mobile devices.

To optimize performance, consider positioning your menu and content absolutely and moving them simultaneously.

For even smoother animations, utilize CSS3's transform and transition properties to leverage hardware acceleration. Check out a tutorial on this topic here.

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