How TO - JavaScript Progress Bar
Learn how to create a progress bar using JavaScript.
Creating a Progress Bar
Step 1) Add HTML:
Example
<div id="myProgress">
<div id="myBar"></div>
</div>
Step 2) Add CSS:
To make an animation possible, the animated element must be animated relative to its "parent container".
Example
#myProgress {
position: relative;
width: 100%;
height:
30px;
background-color:
grey;
}
#myBar {
position: absolute;
width: 1%;
height:
100%;
background-color: green;
}
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Step 3) Add JavaScript:
Create the Animation Using JavaScript:
Example
function move() {
var elem = document.getElementById("myBar");
var width = 1;
var id =
setInterval(frame, 10);
function frame() {
if (width >= 100) {
clearInterval(id);
} else {
width++;
elem.style.width = width + '%';
}
}
}
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Add Labels
If you want to add labels to indicate how far the user is in the process, add a new element inside (or outside) the progress bar:
Step 1) Add HTML:
Example
<div id="myProgress">
<div id="myBar">
<div
id="label">10%</div>
</div>
</div>
Step 2) Add CSS:
Example
/* If you want the label inside the progress bar */
#label {
text-align: center; /* If you want to center
it */
line-height: 30px; /* Set the line-height to the
same as the height of the progress bar container, to center it vertically */
color:
white;
}
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Step 3) Add JavaScript:
If you want to dynamically update the text inside the label to the same value of the width of the progress bar, add the following:
Example
function move() {
var elem = document.getElementById("myBar");
var width = 10;
var id =
setInterval(frame, 10);
function frame() {
if (width >= 100) {
clearInterval(id);
} else {
width++;
elem.style.width = width + '%';
document.getElementById("label").innerHTML = width * 1 +
'%';
}
}
}
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