Best Practice for Form Processing

Question

I was wondering what is best for processing forms?

In my case, I am doing something like this:

• if the user has not submitted the form
  • display form
• still
  • if there are form errors
    • display errors
    • display form again
  • still
    • display success message
    • (and) display the form again

My problem is that I repeat the HTML code for the form 3 times and I don't think this is good practice (a long file that is hard to read).

Answer 1

You must follow the Post / Redirect / Get pattern to avoid duplicate forms.

:

if POST_REQUEST:
  ERRORS = VALIDATE_FORM()
  if ERRORS IS EMPTY:
    PROCESS_REQUEST
    REDIRECT TO <Successful URL>

DISPLAY_FORM(ERRORS)

:

• URL- :
  POST_REQUEST , ( )
• :
  POST_REQUEST - , . ERRORS (, ). ERRORS ,
• :
  POST_REQUEST , . , ERRORS , < URL > .

, .

Django Framework .

VALIDATE_FORM(), , , .

( ) emtpy-.

, , , DISPLAY_FORM():

<ul class="errors"><?php foreach(ERRORS['field_name'] as $error) { echo "<li>$error</li>"; } ?></ul>
<input name="field_name" type="text" ... />

Answer 2

. , HTML- . , , , , . (PHP?) , .

Answer 3

/ .

Answer 4

, , !
:

• • • 302 regirect, HTTP

( , ), , get ( ) ()

! .

Answer 5

script :

• ,

Answer 6

, HTML5 .

Answer 7

Given that in each case you are displaying a form, can you just display the same form by default, and then add additional features like error reporting, etc.?

What other technologies do you use?