The height auto transition in CSS3 begins by shrinking to a height of 0 before expanding to

Question

The height auto transition in CSS3 begins by shrinking to a height of 0 before expanding to

My CSS code looks like this:

.foo
{
    height:100px;
    overflow:hidden;
    -webkit-transition: height 200ms;
    -moz-transition: height 200ms;
    -o-transition: height 200ms;
    transition: height 200ms;
}

.foo.open
{
    height:auto;
}

When the .foo class has an auto height, it typically results in a height of around 550px based on the content inside.

By applying the jQuery class open, I anticipate a smooth transition from 100px to approximately 550px within 200ms using CSS3 transitions.

However, the actual behavior observed is a sudden change from 100px to 0px and then abruptly transitioning to ~550px.

-- Check out the Live Demo --

Changing .open to height:550px works correctly as seen here, but since the content length may vary, setting a fixed pixel height is not feasible and hence the need for an automatic height adjustment.

Why does the div close instead of smoothly sliding to around 550px, and how can I fix this animation issue?

css height css-transitions

Answer 1

Answer №1

Transitioning to height: auto; using CSS transitions may not be possible, but there is a workaround that involves transitioning max-height instead. By setting the max-height to a value greater than it will ever reach, you can achieve a similar effect. The speed of the transition can be adjusted by changing the value, such as setting it to max-height: 1000px;.

Check out this demo for a visual representation.

Here's the code snippet from the demo:


.foo {
    max-height: 100px;
    overflow: hidden;
    -webkit-transition: max-height 200ms;
    -moz-transition: max-height 200ms;
    -o-transition: max-height 200ms;
    transition: max-height 200ms;
}

.foo.open {
    max-height: 1000px;
}

While this solution may not be perfect, it can be a helpful workaround in certain situations.

Answer 2

Transitioning to height: auto; using CSS transitions may not be possible, but there is a workaround that involves transitioning max-height instead. By setting the max-height to a value greater than it will ever reach, you can achieve a similar effect. The speed of the transition can be adjusted by changing the value, such as setting it to max-height: 1000px;.

Check out this demo for a visual representation.

Here's the code snippet from the demo:


.foo {
    max-height: 100px;
    overflow: hidden;
    -webkit-transition: max-height 200ms;
    -moz-transition: max-height 200ms;
    -o-transition: max-height 200ms;
    transition: max-height 200ms;
}

.foo.open {
    max-height: 1000px;
}

While this solution may not be perfect, it can be a helpful workaround in certain situations.

Answer 3

Answer №2

Although not the most stylish approach, this method effectively bypasses the auto height issue.

When the button is clicked, you can determine the div's auto height by executing:

var openHeight = $foo.addClass("heightauto").height();

Immediately remove the class afterwards and set a height for the div equal to openHeight:

$foo.removeClass("heightauto");
$foo.height(openHeight);

The heightauto class must also override CSS3 transitions to ensure the height changes instantaneously:

.foo.heightauto
{
    height:auto;
    -webkit-transition:0;
    -moz-transition:0;
    -o-transition:0;
    transition:0;
}

View Live Demo: http://jsfiddle.net/AbPEx/4/

This method may still be considered hacky. If you have a more elegant solution in mind, I am open to suggestions.

Answer 4

Although not the most stylish approach, this method effectively bypasses the auto height issue.

When the button is clicked, you can determine the div's auto height by executing:

var openHeight = $foo.addClass("heightauto").height();

Immediately remove the class afterwards and set a height for the div equal to openHeight:

$foo.removeClass("heightauto");
$foo.height(openHeight);

The heightauto class must also override CSS3 transitions to ensure the height changes instantaneously:

.foo.heightauto
{
    height:auto;
    -webkit-transition:0;
    -moz-transition:0;
    -o-transition:0;
    transition:0;
}

View Live Demo: http://jsfiddle.net/AbPEx/4/

This method may still be considered hacky. If you have a more elegant solution in mind, I am open to suggestions.

Answer 5

Answer №3

Utilizing transitions with height:auto is not feasible. Although the workaround using max-height is effective, it can be problematic, especially when there's a noticeable delay if max-height is significantly larger than the actual height.

Here's a clever trick I employ: http://jsfiddle.net/g56jwux4/2/ Essentially, it involves two nested DIVs moving in opposite directions. Check out the code on jsfiddle because my explanation may not be clear due to my limited English proficiency.

HTML snippet:

<body>
  <p>Technically, this dropdown menu appears as a simple height transition.</p>
  <p>However, this pure CSS code also caters for a variable number of menu choices, bypassing the limitation of "height:auto" ignored by CSS transitions.</p>
    <input type="checkbox" id="menuOpen"></input>
    <label id="bouton" for="menuOpen"><span>Click on me!</span>
        <div id="menu">
            <div id="masque">
                <div class="choix" id="choix1">Choice 1</div>
                <div class="choix" id="choix2">Choice 2</div>
                <div class="choix" id="choix3">Choice 3 very very long to see final size of menu</div>
                <div class="choix" id="choix4">Choice 4</div>
                <div class="choix" id="choix5">Choice 5</div>
                <div class="choix" id="choix6">Choice 6</div>
            </div>
        </div>
    </label>
</body>

CSS snippet:

body {
    font-family: sans-serif;
}
#menuOpen {
    display: none;
}
#bouton {
    position: absolute;
    left: 100px;
    top: 100px;
    width: 200px;
    height: 30px;
    background-color: lightgray;
    cursor: pointer;
}
#bouton > span {
    color: black;
    padding: 6px;
    line-height: 30px;
}
#menu {
    position: absolute;
    top: 100%;
    overflow: hidden;
    min-width: 100%;
    transition: transform 0.3s linear 0s, visibility 0.3s linear 0s;
    transform: translateY(-100%);
    visibility: hidden;
    color: white;
}
#menuOpen:checked + #bouton > #menu  {
    transform: translateY(0%);
    visibility: visible;
    transition: transform 0.3s linear 0s, visibility 0s linear 0s;
}
#menuOpen:checked + #bouton > #menu > #masque {
    transform: translateY(0%);
}
#masque {
    position: relative;
    background-color: gray;
    transform: translateY(100%);
    transition: transform 0.3s linear 0s;
}
.choix {
    white-space: nowrap;
    padding: 3px 6px;
}
.choix:hover {
    background-color: darkgray; 
}

Answer 6

Utilizing transitions with height:auto is not feasible. Although the workaround using max-height is effective, it can be problematic, especially when there's a noticeable delay if max-height is significantly larger than the actual height.

Here's a clever trick I employ: http://jsfiddle.net/g56jwux4/2/ Essentially, it involves two nested DIVs moving in opposite directions. Check out the code on jsfiddle because my explanation may not be clear due to my limited English proficiency.

HTML snippet:

<body>
  <p>Technically, this dropdown menu appears as a simple height transition.</p>
  <p>However, this pure CSS code also caters for a variable number of menu choices, bypassing the limitation of "height:auto" ignored by CSS transitions.</p>
    <input type="checkbox" id="menuOpen"></input>
    <label id="bouton" for="menuOpen"><span>Click on me!</span>
        <div id="menu">
            <div id="masque">
                <div class="choix" id="choix1">Choice 1</div>
                <div class="choix" id="choix2">Choice 2</div>
                <div class="choix" id="choix3">Choice 3 very very long to see final size of menu</div>
                <div class="choix" id="choix4">Choice 4</div>
                <div class="choix" id="choix5">Choice 5</div>
                <div class="choix" id="choix6">Choice 6</div>
            </div>
        </div>
    </label>
</body>

CSS snippet:

body {
    font-family: sans-serif;
}
#menuOpen {
    display: none;
}
#bouton {
    position: absolute;
    left: 100px;
    top: 100px;
    width: 200px;
    height: 30px;
    background-color: lightgray;
    cursor: pointer;
}
#bouton > span {
    color: black;
    padding: 6px;
    line-height: 30px;
}
#menu {
    position: absolute;
    top: 100%;
    overflow: hidden;
    min-width: 100%;
    transition: transform 0.3s linear 0s, visibility 0.3s linear 0s;
    transform: translateY(-100%);
    visibility: hidden;
    color: white;
}
#menuOpen:checked + #bouton > #menu  {
    transform: translateY(0%);
    visibility: visible;
    transition: transform 0.3s linear 0s, visibility 0s linear 0s;
}
#menuOpen:checked + #bouton > #menu > #masque {
    transform: translateY(0%);
}
#masque {
    position: relative;
    background-color: gray;
    transform: translateY(100%);
    transition: transform 0.3s linear 0s;
}
.choix {
    white-space: nowrap;
    padding: 3px 6px;
}
.choix:hover {
    background-color: darkgray; 
}

Answer 7

Answer №4

I noticed a minor issue in that section, but I have already addressed it by including a min-height of 100px;

.foo {

min-height: 100px;
height: 100px;
...

}

With this adjustment, you should no longer encounter the problem of it reverting back to 0px.

Answer 8

I noticed a minor issue in that section, but I have already addressed it by including a min-height of 100px;

.foo {

min-height: 100px;
height: 100px;
...

}

With this adjustment, you should no longer encounter the problem of it reverting back to 0px.

The height auto transition in CSS3 begins by shrinking to a height of 0 before expanding to

Answer №1

Answer №2

Answer №3

Answer №4

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