How to detect the operating system on the client machine?
In order to detect the operating system on the client machine, the navigator.appVersionstring (property) should be used.
Web Development Interview Questions
What is variable typing in javascript?
It is perfectly legal to assign a number to a variable and then assign a string to the same variable as followsexample i = 10; i = “string”; This is called variable typing
Where are cookies actually stored on the hard disk?
This depends on the user’s browser and OS. In the case of Netscape with Windows OS,all the cookies are stored in a single file called cookies.txt c:\Program Files\Netscape\Users\username\cookies.txt In the case of IE,each cookie is stored in a separate file namely username@website.txt. c:\Windows\Cookies\username@Website.txt
Does javascript have the concept level scope?
No.Javascript does not have block level scope,all the variables declared inside a function possess the same level of scope unlike c,c++,java.
What can javascript programs do?
Generation of HTML pages on-the-fly without accessing the Web server. The user can be given control over the browser like User input validation Simple computations can be performed on the client’s machine The user’s browser, OS, screen size, etc. can be detected Date and Time Handling.
What are undefined and undeclared variables?
Undeclared variables are those that are not declared in the program (do not exist at all),trying to read their values gives runtime error.But if undeclared variables are assigned then implicit declaration is done . Undefined variables are those that are not assigned any value but are declared in the program.Trying to read such variables gives …
How to set a HTML document’s background color?
Document.bgcolor property can be set to any appropriate color.
What is === operator ?
=== is strict equality operator ,it returns true only when the two operands are having the same value without any type conversion.
What are Javascript closures?When would you use them?
Two one sentence summaries: a closure is the local variables for a function – kept alive after the function has returned or a closure is a stack-frame which is not deallocated when the function returns. A closure takes place when a function creates an environment that binds local variables to it in such a way …
What are Javascript closures?When would you use them? Read More »
What does the “Access is Denied” IE error mean?
The “Access Denied” error in any browser is due to the following reason. A javascript in one window or frame is tries to access another window or frame whosedocument’s domain is different from the document containing the script.