If you attempt to run this code before the form elements exist, i.e. Let's say you have code that modifies some form elements on your page. It is a good idea to include error handling in your functions, but you probably don't need it on every function and piece of code. About MDN Terms Privacy Cookies Contribute to the code Other languages: English (US) (en-US) Català (ca) Deutsch (de) Español (es) Français (fr) Bahasa Indonesia (id) 日本語 (ja) 한국어 (ko) Polski (pl)
Here is an example.