Basic Java Script
JavaScript is Scripting Language that is used for various purpose at Client Side as well as Server Side.
<html>
<head>
<title>
Java Script Demo
</title>
</head>
<body>
<form name="frm1" id="frm1">
Enter Name :
<input type="text" id="txtname" name="txtname" />
<input type="button" name="btnshow" id="btnshow" value ="Show" onclick="return showData();"/>
</form>
</body>
<script>
function showData()
{
var nm= document.getElementById("txtname").value;
alert("Hi " + nm);
}
</script>
</html>Here Button Click will call showData() function.
document.getElementById(‘idhere’) : This function search for the element in current document with particular id.
<element>.value : is used to get the values of that particular element.
In above example whatever is written in txtname will be displayed as alert after clicking on button.