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How to set transition height from 0 to automatic using CSS?

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Release： 2023-09-18 12:29:02

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How to set transition height from 0 to automatic using CSS?

Transitioning the height from 0 to "auto" is a way to smoothly animate an element's height as it changes to fit its content. In web development, creating smooth and elegant transitions can make a website more attractive and provide a better user experience. However, creating a transition from height 0 to "auto" can be a bit tricky.

grammar

transition: [property] [duration] [timing-function] [delay];

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Here, property is the CSS property we want to animate, duration is the length of time we want to transition to the end, timing-function specifies the transition The time curve, or speed, which determines how the animation speeds up or slows down over time, and delay is an optional parameter that sets the amount of time to wait before starting the transition.

Transition height

In CSS, a transition is a way to create a smooth, dynamic animation between two states of an element. Specifically, transition height refers to the animation effect that occurs when the height attribute of an element changes, improving user experience and making the website more attractive.

For example, if we want to create a smooth transition when expanding or collapsing a div or toggling the visibility of a dropdown menu. We can do this easily using CSS transition properties and the height property,

Animation height from 0 to "auto"

When we want to create a transition from height 0 to "auto", it's not as simple as just setting the height property to "auto". In fact, the "auto" value is not a valid value for CSS transformations. We can do this by following the steps below.

Step 1: Create HTML Structure

To create a transition, first we need an HTML element to apply it to. Let's use a div with class "element".

For example -

<div class="element">
   <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
   <p>Nulla faucibus nisi nec ullamcorper finibus.</p>
</div>

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Step 2: Add CSS

After creating the HTML structure, we need to add some CSS to create transitions. We first set the initial height of the "element" class to 0 and hide the overflow.

For example -

.element {
   height: 0;
   overflow: hidden;
}

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This will hide the content within the element until it is expanded.

Step 3: Add Transition

Now, we need to add transition attributes to the element. We use the height attribute and set the duration and timing function.

For example -

.element {
   height: 0;
   overflow: hidden;
   transition: height 0.5s ease-in-out;
}

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In this example, the transition will take 0.5 seconds and use the ease-out timing function, which means the transition will start quickly and slow down at the end.

Step 4: Set expansion status

Here, in order to set the expanded state of the element, we use pseudo-classes and set the height to auto.

input[type="checkbox"]:checked~.element {
   height: auto;
}

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Example 1

This is an example of using CSS to set the transition height from 0 to automatic.

<!DOCTYPE html>
<html>
 <head>
   <style>
      body { text-align: center; }
      .element {
         height: 0;
         overflow: hidden;
         transition: height 0.5s ease-in-out;
      }
      input[type="checkbox"]:checked~.element {
         height: auto;
      }
      p { margin: 0;}
   </style>
</head>
   <body>
      <h3>Transitioning height 0 to auto using CSS</h3>
      <input type="checkbox" id="toggle">
      <label for="toggle">Toggle Element</label>
      <div class="element">
         <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
         <p>Nulla faucibus nisi nec ullamcorper finibus.</p>
      </div>
   </body>
</html>

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Example 2

Here is another example of using CSS to set the transition height from 0 to automatic.

<!DOCTYPE html>
<html>
<head>
   <style>
      body{ text-align:center;}
      .box {
         max-height: 0;
         width:200px;
         margin:auto;
         transition: max-height 1.4s ease-out;
         overflow: hidden;
         background: #b2ceed;
      }
      .tab:hover .box {
         max-height: 500px;
         transition: max-height 1s ease-in;
      }
   </style>
</head>
   <body>
      <h2>Transition height 0 to auto using CSS </h2>
      <div class="tab"><b>Hover on me to increase the height.</b>
         <div class="box">Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s</div>
      </div>
   </body>
</html>

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in conclusion

Using CSS to create a transition from 0 to automatic is a simple and effective way to add visual interest to your website. By following the steps outlined in this article, we can easily create this effect and enhance the user experience on our website.

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