In this tutorial we will learn how to Change Background Color using Dropdown menu with JavaScript. HTML onchange event, value property, getElementsByTagName() method, .style property and backgroundColor property is used for this purpose.
Table of Contents
HTML Code
HTML Code is given below, in this code we have a select tag with four options for four different colors. onchange event is used in the select tag to trigger the user defined changeColor() function.
<select name="colors" onchange="changeColor(this)">
<option value="red">Red</option>
<option value="blue">Blue</option>
<option value="yellow">Yellow</option>
<option value="green">Green</option>
</select>
JavaScript Code
Take a look at the JavaScript code, the HTML Dom value property and onchange event is used in this code.
onchange event occurs when the value of an element is changed.
value property sets or returns the value of the selected option in select tag.
As soon as the option of select tag is changed, a change event will occur and it will trigger the changeColor() JavaScript function.
Inside the function this keyword is used to target the select tag and getElementsByTagName() is used to target the HTML body tag to change it's background color.
.style and .backgroundColor properties are used to change color of body tag.
<script>
function changeColor(event)
{
var color = event.value;
document.getElementsByTagName('BODY')[0].style.backgroundColor=color;
}
</script>
Demo
Video Tutorial
Watch video tutorial on Change Background Color using Dropdown menu with JavaScript.