JavaScript Dialog Boxes
1.
Alert: To show
information to user.
Ex:
<script language=”javascript”>
alert(“You are
logged in \n”);
</script>
2.
Confirm: Confirm
user’s choice (True/False).
Ex:
<script language=”javascript”>
confirm(“Do you want to continue
?”);
</script>
3.
Prompt: To get
input from user.
Ex:
<script language=”javascript”>
prompt(“Enter
value : ”+”0”);
</script>
Note:
Prompt takes input in form of characters. We can convert character into Int or
Float using parseInt() or parseFloat() respectively.
Q.
Program to input two values and print their addition.
<script language=”javascript”>
Var a,b,c;
a=prompt(“Enter
value for a :”+0);
b=prompt(“Enter
value for b :”+0);
c=parseInt(a)+parseInt(b);
alert(“Addition of “+a+” & ”+b+” is “+c);
</script>
Q.
Program to print remainder and quociant.
<script
language="javascript">
var a,b,div,mod;
a=prompt("Enter
value for a : "+0);
b=prompt("Enter
value for b : "+0);
div=parseInt(a)/parseInt(b);
alert("Division
of "+a+" & "+b+" is "+parseInt(div));
mod=parseInt(a)%parseInt(b);
alert("Remainder
of "+a+" & "+b+" is "+parseInt(mod));
</script>
JavaScript Functions
<head>
<script language="javascript">
function
msg()
{
alert(“Function
is called”);
}
</script>
</head>
<body>
<input type=”Button”
value=”Function call” onclick=”msg();”/>
</body>
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