JavaScript:Tutorial, Prompt

**TcM** · 12-02-2006, 07:18 AM

Introduction:-
Welcome to another JavaScript tutorial of mine..This is not used so much but still its cool to know how it works! Here you will see how the prompt works

Solution:-
This code goes in the <head> tags:-

Code:

<SCRIPT language="JavaScript"> 
 var visitorname= prompt('Please enter your name, '');
 if ( (visitorname==' ') || (visitorname=="") || (visitorname==null) ) 
 { 
   visitorname="Man"; 
 } 
</SCRIPT>

And this in the <Body> tags:-

Code:

<SCRIPT language="JavaScript"> 
 document.write("<center>Hello, " + visitorname + "!<\center>");

</SCRIPT>

Explanation:-

Code:

 if ( (visitorname==' ') || (visitorname=="") || (visitorname==null) ) 
 { 
   visitorname="Man"; 
 }

Here we are taking a 'precaution' so if the user enters nothing as a name or enters a space or presses Cancel we will take his name as 'Man' so we will tell him 'Hello, Man' instead of nothing..

A Preview:-

Conclusion:-
As Always Feedback is welcome and the full source is attached!!

**John** · 01-20-2007, 05:30 PM

I'm just curious why you included all of this

Code:

(visitorname==' ') || (visitorname=="") || (visitorname==null)

I know in Java and PHP all three cases mean the same thing and only have to use one, is it necessary to include all three?

**xtraze** · 01-21-2007, 01:58 AM

I think it's because to make this work with all kinds of browsers. As some browsers ignore certain rules.

Thread: JavaScript:Tutorial, Prompt

LinkBack

Thread Tools

Search Thread

Display

JavaScript:Tutorial, Prompt

Thread Information

Users Browsing this Thread

Similar Threads

JavaScript:Tutorial, Redirect URL

JavaScript:Tutorial, Confirmation Box

JavaScript:Tutorial, Using Arrays

JavaScript:Tutorial, Your First Game!

JavaScript:Tutorial, Loops

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions