Java script validating form Louisville purge
But if the user unchecks the box, the user DOESNT have to enter info in textarea.
You should also be comfortable installing software on your computer with minimal guidance.
In the interest of space, I'm not including detailed installation instructions for all the software you need; the websites where you can obtain the software provide installation instructions.
Otherwise a browser with Java Script disabled, or a hacker trying to compromise your site, can easily submit invalid data. The first test in the example is therefore only necessary in order to provide a different error message when the input is blank.
Most modern browsers now support HTML5 Form Validation making it possible to validate form elements without (or before) any Java Script is triggered.Validating form input with Java Script is easy to do and can save a lot of unnecessary calls to the server as all processing is handled by the web browser.It can prevent people from leaving fields blank, from entering too little or too much or from using invalid characters.The value of a text input box (or a textarea or password input) is available using the syntax that tells you which option has been selected.The illustration below shows this relationship: Note that the 'I' in selected Index needs to be capitalised - Java Script functions and variables are always case-sensitive. Read more about the humble checkbox in our HTML5 Checkbox Validation article.
For an alternative approach to client-side form validation, without Java Script, check out our new article on HTML5 Form Validation which is available now in most modern browsers.