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HTML5 Slider Control

By Stephen Bucaro

The slider control (<input type="range"), sometimes referred to as a slider bar, displays a bar with an adjustment knob that a user can drag with their mouse pointer. As the user drags the knob, the slider control returns a numerical value which is within the range specified by the values assigned by the coder to the min and max attributes of the control.

Most browser renderings of a slider control do not display the numerical values for various locations of the knob, so the slider control is not designed for precision settings. The basic html code for a slider control is shown below.

A more complete example is shown below.

Slider Control Attributes

min minimum value

max maximum value

step amount of increment or decrement

value starting value

Shown below is some practical code to access the contents of the slider control. The additional attributes are id which allows the JavaScript getElementById method to access the element, and the onchange event to call the JavaScript function.

<!DOCTYPE html>
<html lang='en'>
<head>
<meta charset='utf-8'>

<script>
function displayNumber()
{
   var slideNum = document.getElementById("test").value;
   document.getElementById("show").value = slideNum;
}
window.onload = displayNumber;
</script>

</head>
<body>

<input type="text" id="show" size="4"><br />
<input type="range" id="test" min="0" max="12" step="2" value="4" onchange="displayNumber()">

</body>
</html>

Note that since the slider control itself does not display a value, the displayNumber function is called by the window.onload event to display the initial value assigned by the coder.

More HTML Code:
• HTML center Tag
• Text Features
• HTML5 role Attribute
• Image Map Basics
• HTML title Tag
• The HTML Head Tag
•
• When to Use the nofollow Attribute value
• HTML5 Input Type - URL
• HTML abbr and acronym Tag