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Basic form validation #JavaScript
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0" /> | |
| <title>Form Validation Example</title> | |
| </head> | |
| <body> | |
| <form action="/register" id="registration" method="get" accept-charset="utf-8"> | |
| <input type="text" name="email" placeholder="Email" autofocus autocomplete="off" /> | |
| <input type="password" name="password" placeholder="Password" /> | |
| <input type="password" name="confirmation" placeholder="Password (again)" /> | |
| <label><input type="checkbox" name="agreement"/> I agree </label> | |
| <input type="submit" value="Submit" /> | |
| </form> | |
| <script charset="utf-8" src="validation.js"></script> | |
| </body> | |
| </html> |
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| let form = document.getElementById("registration"); | |
| form.onsubmit = function() { | |
| if (!form.email.value) { | |
| alert("So.. you don't have any email?"); | |
| return false; | |
| } else if (!form.password.value) { | |
| alert("Really? No password?"); | |
| return false; | |
| } else if (form.password.value != form.confirmation.value) { | |
| alert("Passwords don't match"); | |
| return false; | |
| } else if (!form.agreement.checked) { | |
| alert("You can't proceed with agreeing to the TOS."); | |
| return false; | |
| } | |
| return true; | |
| } |
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