Question

Please explain the piece of code below, emphasize on ./login and onsubmit keywords..

<form action="./login" onsubmit ="return validatedata()" method="post">

Answer 1

This is a form tag of HTML language. It says following things:

1. content of this form (such as Text Box or Radio Button or Combo Box or other HTML component values) send to ./login url. It is better use HttpServletRequest.getContextPath() for set relative path rather of absolute path.

2. onsubmit ="return validatedata()" part says: When user click on submit button(with any label) before submit form to ./login url, execute validatedata function in Java Script functions, if this function not existed , user get a java script error(or other script languages).

3. method=”post” part says: this form send with POST method . please see http://www.cs.tut.fi/~jkorpela/forms/methods.html for more information.

for more information related to form tag see : http://www.w3schools.com/tags/tag_form.asp