How to validate password using JavaScript
In this tutorial, we will learn how to validate the password using Javascript.
- First create a HTML FORM having three input fileds Name, Email and Password
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<div class="container"> <form method="post"> <label for="usrname">Name</label> <input type="text" id="usrname" name="usrname" required> <label for="email">email</label> <input type="email" id="emailid" name="emailid" required> <label for="psw">Password</label> <input type="password" id="psw" name="psw" pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}" title="Must contain at least one number and one uppercase and lowercase letter, and at least 8 or more characters" required> <input type="submit" value="Submit"> </form> </div> <div id="message"> <h3>Password must contain the following:</h3> <p id="letter" class="invalid">A <b>lowercase</b> letter</p> <p id="capital" class="invalid">A <b>capital (uppercase)</b> letter</p> <p id="number" class="invalid">A <b>number</b></p> <p id="length" class="invalid">Minimum <b>8 characters</b></p> </div> |
2. CCS used in this tutorial
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<style> /* Style all input fields */ input { width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; margin-top: 6px; margin-bottom: 16px; } /* Style the submit button */ input[type=submit] { background-color: blue; color: white; } /* Style the container for inputs */ .container { background-color: #f1f1f1; padding: 20px; } /* The message box is shown when the user clicks on the password field */ #message { display:none; background: #f1f1f1; color: #000; position: relative; padding: 20px; margin-top: 10px; } #message p { padding: 10px 35px; font-size: 18px; } /* Add a green text color and a checkmark when the requirements are right */ .valid { color: green; } .valid:before { position: relative; left: -35px; content: "✔"; } /* Add a red text color and an "x" when the requirements are wrong */ .invalid { color: red; } .invalid:before { position: relative; left: -35px; content: "✖"; } </style> |
3. Javascript for validating password to accept A lower case letter, A capital(upper case letter), A number and should be at least 8 characters long.
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<script> var myInput = document.getElementById("psw"); var letter = document.getElementById("letter"); var capital = document.getElementById("capital"); var number = document.getElementById("number"); var length = document.getElementById("length"); // When the user clicks on the password field, show the message box myInput.onfocus = function() { document.getElementById("message").style.display = "block"; } // When the user clicks outside of the password field, hide the message box myInput.onblur = function() { document.getElementById("message").style.display = "none"; } // When the user starts to type something inside the password field myInput.onkeyup = function() { // Validate lowercase letters var lowerCaseLetters = /[a-z]/g; if(myInput.value.match(lowerCaseLetters)) { letter.classList.remove("invalid"); letter.classList.add("valid"); } else { letter.classList.remove("valid"); letter.classList.add("invalid"); } // Validate capital letters var upperCaseLetters = /[A-Z]/g; if(myInput.value.match(upperCaseLetters)) { capital.classList.remove("invalid"); capital.classList.add("valid"); } else { capital.classList.remove("valid"); capital.classList.add("invalid"); } // Validate numbers var numbers = /[0-9]/g; if(myInput.value.match(numbers)) { number.classList.remove("invalid"); number.classList.add("valid"); } else { number.classList.remove("valid"); number.classList.add("invalid"); } // Validate length if(myInput.value.length >= 8) { length.classList.remove("invalid"); length.classList.add("valid"); } else { length.classList.remove("valid"); length.classList.add("invalid"); } } </script> |
HERE IS THE FULL CODE THAT WE HAVE WRITTEN DURING THIS TUTORIAL:
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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> /* Style all input fields */ input { width: 100%; padding: 12px; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; margin-top: 6px; margin-bottom: 16px; } /* Style the submit button */ input[type=submit] { background-color: blue; color: white; } /* Style the container for inputs */ .container { background-color: #f1f1f1; padding: 20px; } /* The message box is shown when the user clicks on the password field */ #message { display:none; background: #f1f1f1; color: #000; position: relative; padding: 20px; margin-top: 10px; } #message p { padding: 10px 35px; font-size: 18px; } /* Add a green text color and a checkmark when the requirements are right */ .valid { color: green; } .valid:before { position: relative; left: -35px; content: "✔"; } /* Add a red text color and an "x" when the requirements are wrong */ .invalid { color: red; } .invalid:before { position: relative; left: -35px; content: "✖"; } </style> </head> <body> <h3>Password Validation</h3> <div class="container"> <form method="post"> <label for="usrname">Name</label> <input type="text" id="usrname" name="usrname" required> <label for="email">email</label> <input type="email" id="emailid" name="emailid" required> <label for="psw">Password</label> <input type="password" id="psw" name="psw" pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}" title="Must contain at least one number and one uppercase and lowercase letter, and at least 8 or more characters" required> <input type="submit" value="Submit"> </form> </div> <div id="message"> <h3>Password must contain the following:</h3> <p id="letter" class="invalid">A <b>lowercase</b> letter</p> <p id="capital" class="invalid">A <b>capital (uppercase)</b> letter</p> <p id="number" class="invalid">A <b>number</b></p> <p id="length" class="invalid">Minimum <b>8 characters</b></p> </div> <script> var myInput = document.getElementById("psw"); var letter = document.getElementById("letter"); var capital = document.getElementById("capital"); var number = document.getElementById("number"); var length = document.getElementById("length"); // When the user clicks on the password field, show the message box myInput.onfocus = function() { document.getElementById("message").style.display = "block"; } // When the user clicks outside of the password field, hide the message box myInput.onblur = function() { document.getElementById("message").style.display = "none"; } // When the user starts to type something inside the password field myInput.onkeyup = function() { // Validate lowercase letters var lowerCaseLetters = /[a-z]/g; if(myInput.value.match(lowerCaseLetters)) { letter.classList.remove("invalid"); letter.classList.add("valid"); } else { letter.classList.remove("valid"); letter.classList.add("invalid"); } // Validate capital letters var upperCaseLetters = /[A-Z]/g; if(myInput.value.match(upperCaseLetters)) { capital.classList.remove("invalid"); capital.classList.add("valid"); } else { capital.classList.remove("valid"); capital.classList.add("invalid"); } // Validate numbers var numbers = /[0-9]/g; if(myInput.value.match(numbers)) { number.classList.remove("invalid"); number.classList.add("valid"); } else { number.classList.remove("valid"); number.classList.add("invalid"); } // Validate length if(myInput.value.length >= 8) { length.classList.remove("invalid"); length.classList.add("valid"); } else { length.classList.remove("valid"); length.classList.add("invalid"); } } </script> </body> </html> |
