Created
September 14, 2013 08:03
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Javascript - Password strength meter
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| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> | |
| <html> | |
| <head> | |
| <title> Password strength meter </title> | |
| <script language="javascript"> | |
| var m_strUpperCase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; | |
| var m_strLowerCase = "abcdefghijklmnopqrstuvwxyz"; | |
| var m_strNumber = "0123456789"; | |
| var m_strCharacters = "!@#$%^&*?_~"; | |
| function checkPwdStrength() { | |
| var pwd = document.getElementById("pwd").value; | |
| len = pwd.length; | |
| var scorebar = document.getElementById('scorebar'); | |
| var comp = ""; | |
| if (len == 0) { | |
| scorebar.style.backgroundPosition = '0px 0px'; | |
| comp = "Password Strength"; | |
| } | |
| else { | |
| scr = parseInt(getPwdScore(pwd)); | |
| if(scr >= 90) { | |
| scorebar.style.backgroundPosition = '0px -30px'; | |
| comp = "Very Strong"; | |
| } | |
| else if(scr >= 70) { | |
| scorebar.style.backgroundPosition = '0px -24px'; | |
| comp = "Strong"; | |
| } | |
| else if(scr >= 50) { | |
| scorebar.style.backgroundPosition = '0px -18px'; | |
| comp = "Good"; | |
| } | |
| else if(scr >= 30) { | |
| scorebar.style.backgroundPosition = '0px -12px'; | |
| comp = "Weak"; | |
| } | |
| else if(scr >= 0) { | |
| scorebar.style.backgroundPosition = '0px -6px'; | |
| comp = "Very Weak"; | |
| } | |
| } | |
| document.getElementById('complexity').innerHTML = comp; | |
| return false; | |
| } | |
| function getPwdScore(strPassword) { | |
| // Reset combination count | |
| var nScore = 0; | |
| // Password length | |
| // -- Less than 4 characters | |
| if (strPassword.length < 5) { | |
| nScore += 5; | |
| } | |
| // -- 5 to 7 characters | |
| else if (strPassword.length > 4 && strPassword.length < 8) { | |
| nScore += 10; | |
| } | |
| // -- 8 or more | |
| else if (strPassword.length > 7) { | |
| nScore += 25; | |
| } | |
| // Letters | |
| var nUpperCount = countContain(strPassword, m_strUpperCase); | |
| var nLowerCount = countContain(strPassword, m_strLowerCase); | |
| var nLowerUpperCount = nUpperCount + nLowerCount; | |
| // -- Letters are all lower case | |
| if (nUpperCount == 0 && nLowerCount != 0) { | |
| nScore += 10; | |
| } | |
| // -- Letters are upper case and lower case | |
| else if (nUpperCount != 0 && nLowerCount != 0) { | |
| nScore += 20; | |
| } | |
| // Numbers | |
| var nNumberCount = countContain(strPassword, m_strNumber); | |
| // -- 1 number | |
| if (nNumberCount == 1) { | |
| nScore += 10; | |
| } | |
| // -- 3 or more numbers | |
| if (nNumberCount >= 3) { | |
| nScore += 20; | |
| } | |
| // Characters | |
| var nCharacterCount = countContain(strPassword, m_strCharacters); | |
| // -- 1 character | |
| if (nCharacterCount == 1) { | |
| nScore += 10; | |
| } | |
| // -- More than 1 character | |
| if (nCharacterCount > 1) { | |
| nScore += 25; | |
| } | |
| // Bonus | |
| // -- Letters and numbers | |
| if (nNumberCount != 0 && nLowerUpperCount != 0) { | |
| nScore += 2; | |
| } | |
| // -- Letters, numbers, and characters | |
| if (nNumberCount != 0 && nLowerUpperCount != 0 && nCharacterCount != 0) { | |
| nScore += 3; | |
| } | |
| // -- Mixed case letters, numbers, and characters | |
| if (nNumberCount != 0 && nUpperCount != 0 && nLowerCount != 0 | |
| && nCharacterCount != 0) { | |
| nScore += 5; | |
| } | |
| return nScore; | |
| } | |
| // Checks a string for a list of characters | |
| function countContain(strPassword, strCheck) { | |
| // Declare variables | |
| var nCount = 0; | |
| for (i = 0; i < strPassword.length; i++) { | |
| if (strCheck.indexOf(strPassword.charAt(i)) > -1) { | |
| nCount++; | |
| } | |
| } | |
| return nCount; | |
| } | |
| </script> | |
| <style type="text/css"> | |
| #pmId { | |
| } | |
| #scorebarBorder { | |
| border: 1px solid #666666; | |
| height: 5px; | |
| position: relative; | |
| width: 122px; | |
| } | |
| #scorebar { | |
| background-image: url("pm.png"); | |
| } | |
| #scorebar { | |
| background-position: 0 0; | |
| background-repeat: no-repeat; | |
| height: 5px; | |
| width: 122px; | |
| z-index: 0; | |
| } | |
| #complexity { | |
| padding: 0; | |
| text-align: center; | |
| top: 0; | |
| width: 122px; | |
| z-index: 10; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <table border="0" align="center"> | |
| <tr> | |
| <td><input type="password" id="pwd" value="" onkeyup="return checkPwdStrength();" /></td> | |
| <td> | |
| <div id="pmId"> | |
| <div id="scorebarBorder"> | |
| <div id="scorebar" style="background-position: 0px 0px;"></div> | |
| </div> | |
| <div id="complexity"> | |
| Password Strength | |
| </div> | |
| </div> | |
| </td> | |
| </tr> | |
| </table> | |
| </body> | |
| </html> |
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