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Javascript Password Protection
 Category |
: Web Development |
 Times Read |
: 87 |
 Date |
: 30 July 2008 07:00 |
The protection of web pages using a password comes up earlier or later while developing your site. The most secure way is to implement PHP, ASP or other advanced web programming languages. In this tutorial you will find out how to protect pages using Javascript, because you may need to have a very simple protection, or your current hosting may not support PHP.The first example we are going to discuss is the prompt() function. The function calls a small box to appear, and unless you enter correct password, you will not be able to view the page. The advantage is that you cant view the source code to find out the password without turning Javascript off. The code is as follows:script=prompt("Please enter the password:","")if (script == FAKEPASS){alert(Acess granted);}else {alert(Acess denied)location.href="denied.php" }// done hiding --Now lets look at the code. When you enter the correct password, a box appears saying that Access is Granted, and the rest of the page is loaded. If the password is incorrect, you are redirected to denied.php. I used a little trick with the password here that can stop some unexperienced hackers ;)) the FAKEPASS is not the actual password, even though you can make it look like it. This is just a variable that is described in an external file - "prompt.gif". This is another trick - the external Javascript file has an extension .gif , which is used for images. The file however contains text, and the server will correctly treat it like a text file, not an image. So the content of prompt.gif is:var FAKEPASS = "the_real_password"; As you see, here our variable is substituted with the word "the_real_password", which is the actual password. The second option in protecting a page with Javascript is much prettier, and it actually allows you to have several login and password accounts. The code is:Loginfunction login(){log.style.visibility="visible"}function exit(){log.style.visibility="hidden"}style="position:absolute;top:100;left:300;visibility:hidden;"Entrance Login: Password:
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