To render a Drupal form to a node, drupal_build_form function is used. This function allows us to render all forms except the admin forms. Note that, admin forms didn't find success while rendering the same. In-order to render a form the following syntax is used,
Drupal Form
Creating a module by ourselves, or a new requirement by client would let you to learn more, to research more. One of the latest requirement was to AJAXify a form. To do AJAX-ification was always a troublesome for me.
The createItem() method lets you add data to the queue and the numberOfItems() method lets you see how many items are present in the queue. We use the claimItem() method of the queue object to get an item from the queue. claimItem() returns the data property, which contains whatever we put into the queue. If there is no item in the queue then claimItem() will return FALSE.
Steps for creating queue.
A white screen shows up while submitting a form in your Drupal Site?
There could be many possible causes for WSODs (White Screen of Death) in Drupal, such as PHP error reporting settings, memory exhaustion, etc. If the exact reason could be figured out, fixing becomes much easier.
For treating this specific WSOD issue on form submit, check for the following symptoms: