Results for “validation”
Small, practical examples. Search by task or narrow things down below.
Limit typed text to a maximum length
HTML: Maxlength limits ordinary user editing without replacing server-side validation.
HTML✓ Tested
Raise and catch a domain-specific exception
Python: Give a validation failure its own exception type so callers can handle it narrowly.
Python✓ Tested
Require a nonempty text value
HTML: The required attribute makes an empty text control fail native constraint validation.
HTML✓ Tested
Require a value with NOT NULL
SQL: Declare required fields at the database boundary, not only in application validation.
SQL✓ Tested
Require a value with NOT NULL
SQL Server: Declare required fields at the database boundary, not only in application validation.
SQL Server✓ Tested
Require a value with NOT NULL
Postgres: Declare required fields at the database boundary, not only in application validation.
Postgres✓ Tested
Require a value with NOT NULL
SQLite: Declare required fields at the database boundary, not only in application validation.
SQLite✓ Tested
Type a function’s inputs and output
Catch mismatched arguments during compilation.
function✓ Tested
Validate a field when focus leaves it
jQuery: focusout bubbles and can support delegated form validation.
jQuery✓ Tested
Validate an email input
Use browser constraint validation for a required HTML email field.
HTML✓ Tested