Validating input type file

08-Jun-2017 12:40 by 7 Comments

Validating input type file - jeannie d and janez dating

The form below has three input fields: username, pwd1 and pwd2. If a false value is returned then the form submission is cancelled.This code will work for browsers as far back as Netscape 4 (circa 1997). If you're not sure how to place this on your page, you might need to read the preceding article on Form Validation, or view the HTML source of this page.

The rest of the HTML and Java Script remains unaltered: polyfill code which can be found further down the page.

Because the input type obscures the text typed, you should let the user confirm that they haven't made a mistake.

The simplest way to do this is to have the password entered twice, and then check that they are identical.

A lot of websites now require registration, meaning that users need to be assigned a username and password.

Here are some simple steps to make the process more secure.

The red/green markers have been implemented using CSS: In this example it should be clear to the user that the form can only be submitted once all three green ticks appear.

In any case browsers such as Firefox and Opera will enforce the HTML5 validation rules and present messages as shown here: Presumably the browser messages will change according to the users language - something that would never be possible using only Java Script.

For security a password should never be displayed in HTML or sent by email.

If you're concerned about security you should have some policy on what constitutes a valid password.

Instead of as this lets the browser (and the user) know that the contents of that field need to be secured.

The password won't appear on the screen as you type and most browsers also won't 'remember' the values entered in fields as they do with other form elements.

In some cases, such as on mobile devices, displaying the password may improve usability without compromising security.