Welcome to a tutorial on how to fade in and fade out HTML elements. So you want to fade in a section, or fade out a button once it is clicked on? Some libraries provide convenient “fade features”, but we don’t need to load an entire library just for a simple fade effect.
Fading an HTML element can be easily done with CSS transition and setting the opacity:
- Attach CSS opacity transition on the element –
<div id="demo" style="transition: opacity 1s">DEMO</div> - To fade out –
document.getElementById("demo").opacity = 0 - To fade in –
document.getElementById("demo").opacity = 1
That covers the basic idea, let us walk through more examples in this guide – Read on!
TABLE OF CONTENTS
Download & Notes
Fade In & Out
Extras
The End
DOWNLOAD & NOTES
Here is the download link to the example code, so you don’t have to copy-paste everything.
EXAMPLE CODE DOWNLOAD
Click here to download | Example on CodePen
The example code is released under the MIT license, so feel free to build on top of it or use it in your own project.
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FADE IN & FADE OUT HTML ELEMENTS
All right, let us now get into the examples of fading in & out using CSS and Javascript
TUTORIAL VIDEO
1) FADE ON CLICK
<style>
/* (A) ATTACH FADE ANIMATION */
#demoA { transition: opacity 1s; }
/* (B) FADE ELEMENT */
demoA.hide {
opacity: 0; /* hide */
height: 0; padding: 0; margin: 0; /* to collapse element */
}
</style>
<!-- (C) FADE DEMO -->
<div id="demoA">This will fade.</div>
<input type="button" value="Toggle"
onclick="document.getElementById('demoA').classList.toggle('hide')">This will fade.
As in the introduction above:
- (A) All we need is to attach
transition: opacity 1sto the element. - (B & C) Then toggle the
opacity, CSS animation will do the fade-in/out magic automatically.
P.S. opacity: 0 will turn the element “invisible”, but it will retain the dimensions. If you want to collapse an element on fade, try adding height: 0; padding: 0; margin: 0;
2) FADE ON MOUSE HOVER
<style>
/* (A) ATTACH FADE ANIMATION */
#demoB { transition: opacity 1s; }
/* (B) FADE ON MOUSE HOVER */
#demoB:hover { opacity: 0; }
</style>
<!-- (C) FADE DEMO -->
<div id="demoB">This will fade on mouse hover.</div>This will fade on mouse hover.
Yep, it’s that simple.
- (A) Attach
transition: opacity 1sto the element as usual. - (B) Use
:hover { opacity:0 }to trigger the fade effect on mouse hover.
3) FADE USING CSS ONLY
<style>
/* (A) HIDE CHECKBOX */
#demoD { display: none; }
/* (B) FADE ELEMENT WHEN CHECKBOX IS CHECKED */
#demoE { transition: opacity 1s; }
#demoD:checked + #demoE { opacity: 0; }
</style>
<!-- (C) FADE DEMO -->
<label id="demoC" for="demoD">Click to fade.</label>
<input id="demoD" type="checkbox">
<div id="demoE">This will fade.</div>No Javascript, no problem. Here is a small “checkbox trick” that you can use.
- (C) Create a
<label> <input type="checkbox">pair before the element you want to fade. - (A) Hide the checkbox with
display: none, it can still be toggled by clicking on the label. - (B) Attach
transition: opacity 1sto the element as usual. - (B)
#demoD:checked + #demoE { opacity: 0 }in plain English – If the#demoDcheckbox is checked, set#demoEtoopacity: 0.
EXTRAS
That’s all for this guide, and here is a small section on some extras and links that may be useful to you.
INFOGRAPHIC CHEATSHEET
LINKS & REFERENCES
- Fade Background Image – Code Boxx
- How to do fade-in and fade-out with JavaScript and CSS – Stack Overflow
- A Simple Page Fade-In With JavaScript – alligator.io
THE END
Thank you for reading, and we have come to the end of this guide. I hope that it has helped you with your project, and if you want to share anything with this guide, please feel free to comment below. Good luck and happy coding!
