MediaWiki:PrimeTest.js

/* This is a prime-testing code. The page will only load on specific pages that
are meant to be shown. See Common.js for details.  */

$('<div style="float: right; font-size:0.5em">Enter a number to test primality: <input type="text" id="myNumber" size="14" maxlength="15"><input type="button" value="Calculate" onclick="calculate(form)"><input type="text" id="myResult" name="result" size="55" value="" readonly placeholder="Enter a prime number here for testing!"></div>').appendTo('#PrimeTest_tag');
 
function calculate(form) {
   var num = document.getElementById("myNumber").value;
   num = num.replace(/\,/g,'');
   num = parseInt(num,10);
   var prime;
   var x=Math.sqrt(num)+1;
   var result;
      
    if (isNaN(num) || num < 0) {
    document.getElementById("myResult").value=(num + " is not a valid number!  Try again!");
    return;
    }
   
   //Switch block starts
   switch (num) {
   case 0:
      result=("Uh......are you sure about number 0?");
      break;
   case 1:
      result=("1 is not prime by definition. It has only 1 factor.");
      break;
   case 2:
      result=("2 is a prime number! The only even one, sadly.");
      break;
   case 3:
      result=("3 is a prime number! It's 3primetime3's favorite prime!");
      break;
   case 37:
      result=("You found an easter egg! It's Blueeighthnote's favorite prime!");
      break;
   case 83:
      result=("83 is a prime number! It's Minipop56's favorite prime!");
      break;
   default: 
   for (var i=2;i<=x;i++) {
      if (num % i === 0) {
         prime="yes";
         result=(num + " is not prime.  It is divisible by " + i + ".");
         break;
      }
      if (num % i !== 0) prime="no";
   }
   if (prime == "no") result=(num + " is prime!");
   }
   //End Switch block
   document.getElementById("myResult").value = result;
}