‘#validated’ => ‘TRUE’ add this into your form elements definitions:


Example:
form['my_dynamic_select'] = array(
…
‘#type’ => ‘select’,
‘#validated’ => TRUE
…
)

Reason:
If we are using an input in AJAX related situation we will fill the input field like SELECT (dropdown) this error will shown in the interface.  Because when a value is not present in the page load will not allowed in form submission time.  So, the Drupal restricts this type of value.  This value is considered as illegal value.  Say for example an user can inject a set of value in our site and they can choose a particular value in it.

But our case is also same like injecting in sense of pushing a new set of values through AJAX.  So now and then we need to used the form field attribute "validate as True", to get a Permanent and Perfect solution too.

Views can be used to generate lists of content in various formats same as report generator works.

We can install CCK (Content construction kit) module and create content types. We can define the structure of each content type too.

We can create roles (moderators, proof readers, content admins etc) and we can permit each task to each role. A user can have 1 or many roles.

New module is developed by implementing hooks. Hooks are defined in the API. At certain events, drupal hook into our modules.E.g. When a page is request processing

It is the settings.php file. The script will automatically populates database tables and configures the correct settings in the settings.php file.
It also explains how to do a “multi site” installation.

Block is a section in a page (recent posts, news, vote to something, login box, navigation), which is movable to regions (header, footer, content top etc) in a page. Blocks can be configured to show/hide only to certain type of user roles, url patterns or some other advanced criteria. (Content area is not a block)

function modulename_init() {
  drupal_add_js(drupal_get_path('module', 'modulename') . '/js/modulerelated.js');
}

function modulename_init() {
   drupal_add_css(drupal_get_path('module', 'modulename')  .'/styles.css');
}