JavaScript Introduction
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JavaScript Introduction
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This page contains some examples of what JavaScript can do.
JavaScript Can Change HTML Content
One of many JavaScript HTML methods is getElementById().
This example uses the method to "find" an HTML element (with id="demo")
and changes the element content (innerHTML) to "Hello
JavaScript":
Example
document.getElementById("demo").innerHTML = "Hello JavaScript";Try it Yourself »
JavaScript accepts both double and single quotes:
Example
document.getElementById('demo').innerHTML = 'Hello JavaScript';Try it Yourself »
JavaScript Can Change HTML Attribute Values
In this example JavaScript changes the value of the src (source) attribute of an <img> tag:
The Light Bulb
Try it Yourself »
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JavaScript Can Change HTML Styles (CSS)
Changing the style of an HTML element, is a variant of changing an HTML
attribute:
Example
document.getElementById("demo").style.fontSize = "35px";
or
document.getElementById('demo').style.fontSize = '35px';Try it Yourself »
JavaScript Can Hide HTML Elements
Hiding HTML elements can be done by changing the display style:
Example
document.getElementById("demo").style.display = "none";
or
document.getElementById('demo').style.display = 'none';Try it Yourself »
JavaScript Can Show HTML Elements
Showing hidden HTML elements can also be done by changing the display style:
Example
document.getElementById("demo").style.display = "block";
or
document.getElementById('demo').style.display =
'block';Try it Yourself »
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