Issues with CSS transitions not functioning properly following the use of toggleClass()

Question

Issues with CSS transitions not functioning properly following the use of toggleClass()

I recently implemented a toggle-menu feature, which you can see in action on this demo.

To enhance the toggle-menu, I added a CSS transition effect to div.nav-menu, utilizing max-height:0; and increasing it to max-height:480px;.

However, after clicking the menu toggle to reveal the menu, the transition works perfectly. Yet, upon clicking the toggle to hide the menu again, the transition fails to work.

I'm puzzled as to what might be causing this issue. Any insight would be greatly appreciated!

jquery css css-transitions

Answer 1

Answer №1

Your understanding of CSS Transitions is incorrect. Contrary to your belief, they do not trigger animation when classes are added or removed; rather, the animation occurs only when CSS properties are changed. It seems that you are directly adding and removing classes in this scenario.

Allow me to present a solution:

$( '.menu-toggle' ).on( 'click', function() {
    if(nav.hasClass('toggled-on')) {
       menu.css('maxHeight', 0);
       //^ By modifying 'max-height' first, the Transition animation will be activated
    }
    else menu.css('maxHeight', '480px'); 
         // ^ Alternatively, setting it back to 480px if needed;
} );

// Then, I attach an event listener for the end of the transition on the element to toggle its class
// Once the transition completes

menu.on("transitionend webkitTransitionEnd oTransitionEnd MSTransitionEnd", function() {
    nav.toggleClass( 'toggled-on' );
});

View Updated Fiddle

Answer 2

Your understanding of CSS Transitions is incorrect. Contrary to your belief, they do not trigger animation when classes are added or removed; rather, the animation occurs only when CSS properties are changed. It seems that you are directly adding and removing classes in this scenario.

Allow me to present a solution:

$( '.menu-toggle' ).on( 'click', function() {
    if(nav.hasClass('toggled-on')) {
       menu.css('maxHeight', 0);
       //^ By modifying 'max-height' first, the Transition animation will be activated
    }
    else menu.css('maxHeight', '480px'); 
         // ^ Alternatively, setting it back to 480px if needed;
} );

// Then, I attach an event listener for the end of the transition on the element to toggle its class
// Once the transition completes

menu.on("transitionend webkitTransitionEnd oTransitionEnd MSTransitionEnd", function() {
    nav.toggleClass( 'toggled-on' );
});

View Updated Fiddle

Answer 3

Answer №2

If you're looking to achieve the desired effect, there's a simpler method available.

View Demo

JavaScript

$(function() {
    $('.menu-toggle').click(function(){
        if($('.nav-menu').is(':hidden')){ // check if menu is hidden
            $('.nav-menu').slideDown();}  // slide down if hidden
        else{$('.nav-menu').slideUp();}   // slide up if visible
    });
});

CSS

html {
    font-size: 100%;
    overflow-y: scroll;
}
body {
    max-width: 860px;
    margin: 0 auto;
    font-family: Arial, sans-serif;
}
.main-navigation {
    clear: both;
    min-height: 50px;
    margin-top: 25px;
    position: relative;
}
.menu-toggle {
    cursor: pointer;
    display: inline-block;
    font: bold 15px/1.3;
    margin: 0;
    padding: 10px;
    color: #fff;
    background-color: #333;
}

.nav-menu {
    margin: 0;
    background-color: #333;
    display: none;
    overflow: hidden;
}

.nav-menu ul {
    display: block;
    margin: 0;
    padding: 0;
    width: 100%;
}
.nav-menu li {
    display: block;
    padding: 10px;
}
.nav-menu li a {
    display: block;
    padding:10px;color:#fff;line-height:1;
    text-decoration: none;
}
.nav-menu li a:hover,.nav-menu li a:focus{background:#444;}
.toggled-on li a:active{background:#2A8A15;}

jQuery .slideUp() Documentation and jQuery .slideDown() Documentation

Answer 4

If you're looking to achieve the desired effect, there's a simpler method available.

View Demo

JavaScript

$(function() {
    $('.menu-toggle').click(function(){
        if($('.nav-menu').is(':hidden')){ // check if menu is hidden
            $('.nav-menu').slideDown();}  // slide down if hidden
        else{$('.nav-menu').slideUp();}   // slide up if visible
    });
});

CSS

html {
    font-size: 100%;
    overflow-y: scroll;
}
body {
    max-width: 860px;
    margin: 0 auto;
    font-family: Arial, sans-serif;
}
.main-navigation {
    clear: both;
    min-height: 50px;
    margin-top: 25px;
    position: relative;
}
.menu-toggle {
    cursor: pointer;
    display: inline-block;
    font: bold 15px/1.3;
    margin: 0;
    padding: 10px;
    color: #fff;
    background-color: #333;
}

.nav-menu {
    margin: 0;
    background-color: #333;
    display: none;
    overflow: hidden;
}

.nav-menu ul {
    display: block;
    margin: 0;
    padding: 0;
    width: 100%;
}
.nav-menu li {
    display: block;
    padding: 10px;
}
.nav-menu li a {
    display: block;
    padding:10px;color:#fff;line-height:1;
    text-decoration: none;
}
.nav-menu li a:hover,.nav-menu li a:focus{background:#444;}
.toggled-on li a:active{background:#2A8A15;}

jQuery .slideUp() Documentation and jQuery .slideDown() Documentation

Answer 5

Answer №3

It's recommended to use height instead of max-height

.nav-menu {
    margin: 0;
    background-color: #1e1e1e;
    height:0;
    display: block;
    clear: both;
    overflow: hidden;
    -moz-transition:all 350ms cubic-bezier(.42,0,.58,1);
    -ms-transition:all 350ms cubic-bezier(.42,0,.58,1);
    -o-transition:all 350ms cubic-bezier(.42,0,.58,1);
    -webkit-transition:all 350ms cubic-bezier(.42,0,.58,1);
    transition:all 350ms cubic-bezier(.42,0,.58,1);
}
.toggled-on .nav-menu {
    display: block;
    height:480px;
}

Answer 6

It's recommended to use height instead of max-height

.nav-menu {
    margin: 0;
    background-color: #1e1e1e;
    height:0;
    display: block;
    clear: both;
    overflow: hidden;
    -moz-transition:all 350ms cubic-bezier(.42,0,.58,1);
    -ms-transition:all 350ms cubic-bezier(.42,0,.58,1);
    -o-transition:all 350ms cubic-bezier(.42,0,.58,1);
    -webkit-transition:all 350ms cubic-bezier(.42,0,.58,1);
    transition:all 350ms cubic-bezier(.42,0,.58,1);
}
.toggled-on .nav-menu {
    display: block;
    height:480px;
}

Issues with CSS transitions not functioning properly following the use of toggleClass()

Answer №1

Answer №2

Answer №3

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