How to make text fade out

Question

I have an HTML form, and on a button click, javascript processes it, and text appears below the button, saying "form sent". I would like to make this text fade away after a few seconds, say around five. I am using this method to write the text in the first place:

document.getElementById('sent_box').innerHTML='form sent.';

The HTML box being written to looks like this:

<div id='sent_box'></div>

with this styling:

#sent_box{
height: 20px;
margin-top: 20px;
}

How would I be able to make the text fade out after ten seconds?

Note that I need a Vanilla Javascript solution to this. NO JQuery answers, please.

Thanks for any help!

Answer 1

You can do this with pure JS.

I've added comments for each line of the JS so you can understand and learn for future reference.

 setTimeout(function() { // start a delay var fade = document.getElementById("fade"); // get required element fade.style.opacity = 1; // set opacity for the element to 1 var timerId = setInterval(function() { // start interval loop var opacity = fade.style.opacity; // get current opacity if (opacity == 0) { // check if its 0 yet clearInterval(timerId); // if so, exit from interval loop } else { fade.style.opacity = opacity - 0.05; // else remove 0.05 from opacity } }, 100); // run every 0.1 second }, 5000); // wait to run after 5 seconds 

 <div id="fade">Test</div> 

Answer 2

Here's a simpler option.

The CSS:

<style>
#objecttofade{
             color: white;
             opacity: 1;             //set opacity to 1 so it will be fully visible
             transition: all 0.25s; //you can change the duration of the transition
             }
<style>

JS:

<script> function change(){                        //assign onload or onclick
    document.getElementById('p1').style.opacity = "0";}//changes opacity to 0
</script>

Answer 3

Why not use css 3. Follow this link to jsfiddle for an example.

http://jsfiddle.net/nZjEL/179/

 @-webkit-keyframes fade-out {
0% { opacity: 1; -webkit-transform: scale(1);}
85% {opacity: 1; -webkit-transform: scale(1.05);}
100% {-webkit-transform: scale(.1); opacity: 0;}
}

.fade-out {
    -webkit-animation: fade-out .5s ease-in;
    -webkit-animation-fill-mode: forwards;
    -webkit-animation-iteration-count: 1;
    background-color: #000;
    width: 100px;
    height: 100px;
    opacity: 1;
}

.fade-out.one {-webkit-animation-delay: .5s;}
.fade-out.two {-webkit-animation-delay: 1.5s;}
.fade-out.three {-webkit-animation-delay: 2.5s;}
.fade-out.four {-webkit-animation-delay: 5.5s;}