90 lines
2.8 KiB
HTML
90 lines
2.8 KiB
HTML
<html>
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<head>
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<title>Example 6.14</title>
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<script>
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function checkPassword(pword)
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{
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var userWord = ""; var char1 = ""; var msg ="";
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var checkLength = false; var checkChar = false; var checkDigit = false; var checkSpecial = false;
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userWord = document.getElementById(pword).value;
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document.getElementById('show_word').innerHTML = userWord;
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//check length of word
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while (checkLength == false)
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{
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if ((userWord.length < 4) || (userWord.length > 8))
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{
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msg = "The password must be between 4 and 8 characters. Try again";
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document.getElementById('error_msg').innerHTML = msg;
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userWord = document.getElementById(passwrd).value;
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}
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else
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checkLength = true;
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}
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//check first character
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char1 = userWord.substr(0,1);
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while (checkChar== false)
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{
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if ((char1 < 65) || ((char1 > 90) && (char1 < 97)) || (char1 > 122))
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{
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msg = "The first character must be a letter of the alphabet. Try again";
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document.getElementById('error_msg').innerHTML = msg;
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userWord = document.getElementById(passwrd).value;
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}
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else
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checkChar = true;
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}
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//check for digit
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wordLength = userWord.length;
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for (i = 1; i <= (wordLength - 1); i++)
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{
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if ((userWord.charCodeAt(i) >= 47) && (userWord.charCodeAt(i) <= 58))
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{
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checkDigit = true;
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break;
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}
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}
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if (checkDigit == false)
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{
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msg = "You must have at least one number in the password. Try again";
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document.getElementById('error_msg').innerHTML = msg;
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userWord = document.getElementById(passwrd).value;
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}
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//check for special character
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for (i = 1; i <= (wordLength - 1); i++)
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{
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if ((userWord.charCodeAt(i) == 35) || (userWord.charCodeAt(i) == 36) || (userWord.charCodeAt(i) == 37))
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{
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checkSpecial = true;
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break;
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}
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}
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if (checkSpecial == false)
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{
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msg = "You must have one special character ($, %, or #) in the password. Try again";
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document.getElementById('error_msg').innerHTML = msg;
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userWord = document.getElementById(passwrd).value;
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}
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if ((checkLength == true) && (checkChar == true) && (checkDigit == true) && (checkSpecial == true))
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{
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msg = "Congratulations! You have successfully entered a valid password.";
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document.getElementById('error_msg').innerHTML = msg;
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}
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}
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</script>
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</head>
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<body>
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<table width = 60% align = "center"><tr><td><br />
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<h3> Enter a password in the box below. Your password must:
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<ul><li>contain between 4 and 8 characters</li>
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<li>begin with a letter of the alphabet (upper or lowercase)</li>
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<li>contain at least one digit (0 - 9)</li>
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<li>contain one of the following special characters: dollar sign ($), percent sign (%), or pound sign (#)</li></ul>
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<p><input type="password" name="user_pwrd" id="passwrd" size = ""/>
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<input type ="button" onclick="checkPassword('passwrd')" value = "ok"></button></p>
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<p><span id="error_msg"> </span><br />
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<p>Password information:<br />
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Password entered: <span id = "show_word"> </span> </p>
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</td></tr></table>
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</body></html>
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