refreshing the same form and using post method

[tamayo]

hi, I have a php form that has multiples options classified by category, it's a better approach to the user thatfirst he choose the main option inside a select box and after that display just the options related to the choose, something like that:

pizza: cheese, meat, chicken
hotdog: chillie, cheddar
hamburguer: cheese, onions, spicy

I'm really not sure how to do this, but i think that in the form tag in the method I can type php_self but after the user has completed the info I need to store it in a database so I need the post method to call another php file, so my question is:

how can I refresh the form every time the main option is changed and use the post method when the submit is push it?

regards

[johanafm]

The easiest way to do it is using AJAX and the easiest way to do that is using jQuery.

Set onchange event for the first select box. When that triggers, you sent an XHR to the server requesting the data needed to fill out the controls relating to the selected item. After that, you create the needed elements and populate them with data. You could instead also fill out existing elements wrapped in a div or similar set to display: none; and then change that to display: block.