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How to display completion progress of a task in HTML5?
If we want to serve a visual demonstration of completion of any task or goal, we use <progress> element. To display how much progress has been towards task completion we use max and value attributes. Following is the syntax of <progress> tag in HTML -
<progress value=”20” max=”100”></progress>
Progress has open and closing tags. It is a new semantic element in HTML5. For displaying a file is being uploaded also this progress bar is used.
The HTML <progress> tag supports the following attributes −
Attribute |
Value |
Description |
|---|---|---|
max |
Max |
It should have a value greater than zero and a valid floating-point number. |
value |
value |
Specifies how much of the task has been completed. It should be a floating-point number between 0 and max or 0 and 1 if max is omitted. |
It also supports the global and event attributes.
Example
Following example demonstrates how to display completion progress of a task in HTML −
<!DOCTYPE html> <html> <body> <h1>Progress element in HTML</h1> <label for="file">File Copying Progress:</label> <progress id="file" value="45" max="100"> 45% </progress> </body> </html>
Now, let us see how to style the progress bar in HTML −
CSS Styling the Progress bar
Now let’s style the progress bas using CSS –
<!DOCTYPE html>
<html>
<head>
<style>
progress[value] {
-webkit-appearance: none;
appearance: none;
width: 250px;
height: 20px;
}
</style>
</head>
<body>
<h1>Progress element in HTML</h1>
<label for="file">File Downloading Progress:</label>
<progress id="file" value="35" max="100"> 35% </progress>
</body>
Example
Following example, creates a progress bar with two buttons, increase and decrease the bar by applying JavaScript code.
<!DOCTYPE html>
<html>
<style>
#container {
width: 100%;
background-color: gray;
}
#bar {
width: 0%;
height: 40px;
background-color: red;
}
</style>
<body>
<h1>Progress Bar</h1>
<div id="container">
<div id="bar"></div>
</div>
<br>
<button onclick="Increase()">Increase</button>
<button onclick="Decrease()">Decrease</button>
<!-- dispaying message for user -->
<h2>Increase by 5%</h2>
<h2>Decrease by 5%</h2>
<script>
function Increase() {
var elem = document.getElementById("bar");
var width = elem.style.width;
width = width.replace(/%/g, '');
if (width == "") width = '5';
else width = parseInt(width) + 5;
if (width == 100) {
width = width.toString() + '%';
elem.style.width = width;
} else if (width < 100) {
width = width.toString() + '%';
elem.style.width = width;
}
}
function Decrease() {
var elem = document.getElementById("bar");
var width = elem.style.width;
width = width.replace(/%/g, '');
if (width == "") width = '0';
else width = parseInt(width) - 5;
if (width == 0) {
width = width.toString() + '%';
elem.style.width = width;
} else if (width > 0) {
width = width.toString() + '%';
elem.style.width = width;
}
}
</script>
</body>
</html>
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