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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.
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.
A few simple form attributes can have the same effect as reams of Java Script code libraries.
Here we have an enhanced version of the above code where we've added HTML5 handler to the first password field which updates the pattern required by the second password field - in effect forcing them to be identical: Here you can see a screen shot from Safari of the form being completed.
Otherwise your application needs to provide this function.
Passwords need to be stored encrypted in the database or elsewhere and any backups should also be encrypted.
The rest of the HTML and Java Script remains unaltered: polyfill code which can be found further down the page.
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.
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 most browsers - those that support Java Script 1.5 (Firefox, Chrome, Safari, Opera 7 and Internet Explorer 8 and higher) - you can use more powerful regular expressions. The code presented above is fine in that it checks everything that we wanted to check, but uses a lot of code to test each requirement individually and present different error messages.