Type of and isvalid operator in wml?

Answer 1

isvalid:- Isvalid is a operator whic returns the true value if a URL has right syntax,and also returns a false if URL has wrong syntax.

in other word we can say that,

The isvalid operator is used to test the validity of a variable or the result type of executing an expression. A boolean value is returned to denote the results of the test. A true is returned if the variable or result type is valid. A false is returned if the variable or result type is invalid.

Do not confuse this operator with the URL.isValid function which is used to validate the syntax of a URL address string.

The classic case of an invalid result type for an expression is dividing by zero. In this example, as expected, the isvalid operator returns a false.

Type of:-The typeof operator is used to determine the type of a given expression. An integer is returned that defines the type.

There are five types recognized by WMLScript:

TypeIntegerInteger0Floating-point1String2Boolean3Invalid4

This example tests two expressions; the first is a floating-point number and the second is division by zero which is invalid.

Examples">Examples">Examples

Code:

"http://www.WAPforum.org/DTD/wml_1.1.xml">

typeof example

1st expression = $(expression1)

1st type = $(typeinteger1)

2cd expression = $(expression2)

2cd type = $(typeinteger2)

Explanation:

Code for TypeofExample.wml.

Language(s): WML

Code:extern function findtypeof()

{

var exp1 = 123.456;

var int1 = typeof(exp1);

WMLBrowser.setVar("expression1", exp1);

WMLBrowser.setVar("typeinteger1", int1);

var exp2 = 1/0;

var int2 = typeof(exp2);

WMLBrowser.setVar("expression2", exp2);

WMLBrowser.setVar("typeinteger2", int2);

WMLBrowser.go("TypeofExample.wml#card2");

};

posted by samsher singh B level