Validating input type file vms updating an indexed file
All we have changed from the previous example is to add some extra attributes to the form input fields.
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.
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.