Data availability using ajax: I was going for an interview where I had clear my first round and in the second round they had given me a form in this which lots of functionality with ajax validation of data in the database. So had stat my coding test and stuck at a point where I have to do this so I had searched about this and find the best solution.
There lots of solution available in Drupal to create tabular data with form but the best solution is to use "theme() function" for this. When I was a beginner in Drupal I have created a table using "form API" in which I have included "for loop" and "field type" etc. to achieve this task. That time I don't care of coding standard but my main aim was to finish the task by hook or by crook.
Entityform
Entityform one the best module which is used to create entity-form. Why we call it entity-form while there is already a contributed module available, called "Webform" which is used to create forms. Entity form is better than webform because you can reuse fields in entityfom and it can be used with any entity API like
An Autocomplete form: We all know we are lazy by nature and we want everything on their hand without any efforts or hard-work. This lead to thinking peoples to search for new technologies. So an auto-complete thing works the same in which people just put some data in a textfield and all the things will be done automatically (depends on input data). It's an Ajax thing which is used to exchange data from the server at the client site.
I have read so may article on 'How to make custom module'. There are lots of bloggers who write at at-least once about "How to make a module or custom module" that's why I have decided to write about module and custom modules. The module is used to extend the functionality of Drupal and there are more than 25000+ modules freely available for use. Different-2 modules are used for different-2 purposes like for e-commerce Drupal-commerce or Ubercart, for social business solution Drupal-Commons, for page view View, etc.