Created
July 23, 2024 01:56
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Form validation on keystroke
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>Alphanumeric Input Validation</title> | |
| <script> | |
| document.addEventListener("DOMContentLoaded", function() { | |
| var inputField = document.getElementById("alphanumericInput"); | |
| inputField.addEventListener("keypress", function(event) { | |
| var regex = /^[a-zA-Z0-9]+$/; | |
| var key = String.fromCharCode(!event.charCode ? event.which : event.charCode); | |
| if (!regex.test(key)) { | |
| event.preventDefault(); | |
| return false; | |
| } | |
| }); | |
| }); | |
| </script> | |
| </head> | |
| <body> | |
| <form> | |
| <label for="alphanumericInput">Enter Alphanumeric Characters:</label> | |
| <input type="text" id="alphanumericInput" name="alphanumericInput"> | |
| </form> | |
| </body> | |
| </html> |
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