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<!DOCTYPE html>
<html lang="en-IN">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>
HTML JavaScript
</title>
<style>
#nextbutton {
display:block;
position:absolute;
padding:5px 15px;
color:white;
text-decoration:none;
background-color:lightgreen;
right:5px;
border-radius:5px;
margin:10px 15px;
}
#previousbutton {
display:block;
position:absolute;
padding:5px 15px;
color:white;
text-decoration:none;
background-color:lightgreen;
left:5px;
border-radius:5px;
margin:10px 15px;
}
#nextbutton:hover, #previousbutton:hover {
background-color:green;
}
th {
text-align:left;
}
table {
border:1px solid black;
}
tr:nth-child(even) {
background-color:grey;
}
</style>
</head>
<body>
<h1>
HTML JavaScript
</h1>
<br>
<a href="28. HTML Iframes.html" title="HTML Iframes" id="previousbutton">Previous</a>
<a href="30. HTML File Paths.html" title="HTML File Paths" id="nextbutton">Next</a>
<br>
<br>
<p>
JavaScript makes HTML pages more dynamic and interactive.
<br>
Example:-
<br>
<h1>My First JavaScript</h1>
<button type="button" onclick="document.getElementById('demo').innerHTML = Date()">Click me to display Date and Time</button>
<br>
<br>
<p id="demo"></p>
</p>
<br>
<br>
<h2>
The HTML <script> Tag
</h2>
<br>
<p>
The HTML <script> tag is used to define a client-side script (JavaScript).
<br>
The <script> element either contains script statements, or it points to an external script files through the src attribute.
<br>
Common uses for JavaScript are image manipulation, form validation, and dynamic changes of content.
<br>
To select a HTML element, JavaScript most often uses the <span style="color:red;">document.getElementById()</span> method.
<br>
This JavaScript example writes "Hello JavaScript!" into a HTML element with id="demo1".
<br>
Example:-
<br>
<p id="demo1"></p>
</p>
<br>
<br>
<h2>
A Taste of JavaScript
</h2>
<br>
<p>
Here are some examples of what JavaScript can do.
<br>
Example 1:-
<br>
JavaScript can change content:-
<br>
<p>JavaScript can change the content of a HTML element.</p>
<br>
<button type="button" onclick="myFunction1()">Click Me!</button>
<p id="demo2">This is a demonstration.</p>
<br>
<br>
Example 2:-
<br>
JavaScript can change styles:-
<br>
<p id="demo3">JavaScript can change the styles of the HTML element.</p>
<br>
<button type="button" onclick="myFunction2()">Click Me!</button>
<br>
<br>
Example 3:-
<br>
JavaScript can change attributes:-
<br>
<p>Here, JavaScript changes the value of the src (source) attribute of an image. </p>
<br>
<br>
<img id="demo4" src="Image35.gif" width="100" height="180">
<br>
<button type="button" onclick="light(1)">Light On</button>
<button type="button" onclick="light(0)">Light Off</button>
</p>
<br>
<br>
<h2>
The HTML <noscript> Tag
</h2>
<br>
<p>
The HTML <noscript> tag defines an alternate content to be displayed to users that have disabled scripts in their browsers or have a browser that does not support scripts.
<br>
Example:-
<br>
<p id="demo5"></p>
<br>
<p>A browser without support for JavaScript will show the text written inside the noscript element. </p>
</p>
<br>
<br>
<h2>
HTML Script Tags
</h2>
<br>
<table style="width:100%;">
<tr>
<th>Tag</th>
<th>Description</th>
</tr>
<tr>
<td><script></td>
<td>Defines a client-side script</td>
</tr>
<tr>
<td><noscript></td>
<td>Defines an alternate content for users that do not support client-side scripts</td>
</tr>
</table>
<br>
<a href="28. HTML Iframes.html" title="HTML Iframes" id="previousbutton">Previous</a>
<a href="30. HTML File Paths.html" title="HTML File Paths" id="nextbutton">Next</a>
<br>
<br>
<script>
document.getElementById('demo1').innerHTML = "Hello JavaScript!";
function myFunction1()
{
document.getElementById('demo2').innerHTML = "Hello JavaScript!";
}
function myFunction2()
{
document.getElementById('demo3').style.fontSize = "25px";
document.getElementById('demo3').style.color = "red";
document.getElementById('demo3').style.backgroundColor = "yellow";
}
function light(sw)
{
var pic;
if(sw==0)
{
pic = "Image35.gif";
}
else
{
pic = "Image36.gif";
}
document.getElementById('demo4').src = pic;
}
document.getElementById('demo5').innerHTML = "Hello JavaScript!";
</script>
<noscript>
Sorry, your browser does not support JavaScript!
</noscript>
</body>
</html>