Explain Code

[vinith98]

Hello ppl,


Could anybody please explain me the following Javascript code, it is used to reveal passwords that is in asterisk.

Code: Select all

javascript:(function(){var s,F,j,f,i; s = ""; F = document.forms; for(j=0; j<F.length; ++j) { f = F[j]; for (i=0; i<f.length; ++i) { if (f[i].type.toLowerCase() == "password") s += f[i].value + "\n"; } } if (s) alert("Password is:\n\n" + s); else alert("No passwords");})();


[rangana]

Code formatted and comments attached inline:

Code: Select all

(function(){
   var s,F,j,f,i; s = ""; // Initialize variables
   F = document.forms; // Get all the forms within the document
   for(j=0; j<F.length; ++j) { // Loop through all the forms
      f = F[j]; // Get all instance of form and save it to "f" variable
      
      for (i=0; i<f.length; ++i) { // Loop through all the form's elements
         if (f[i].type.toLowerCase() == "password") // Check if the element is of type password
            s += f[i].value + "\n"; // Append the password's value to "s" variable with a new line at the end.
         }
      }
   
   if (s) // If there's a content
      alert("Password is:\n\n" + s); // Alert the password
   else // Otherwise
      alert("No passwords"); // No password
})();


[vinith98]

Thanks a lot for replying rangana