Providing custom error messages for built-in HTML5 form validation
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <title>Form Validation</title> | |
| <style> | |
| body { padding: 10px; } | |
| </style> | |
| </head> | |
| <body> | |
| <form> | |
| <label for="name">Name</label> | |
| <input type="text" id="name" name="name" required /> | |
| <button type="submit">Submit</button> | |
| </form> | |
| <script> | |
| const input = document.querySelector('input[name="name"]'); | |
| input.addEventListener('invalid', function (event) { | |
| if (event.target.validity.valueMissing) { | |
| event.target.setCustomValidity('Please tell us how we should address you.'); | |
| } | |
| }) | |
| input.addEventListener('change', function (event) { | |
| event.target.setCustomValidity(''); | |
| }) | |
| </script> | |
| </body> | |
| </html> |
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