How to Use Resource Command for Ajax in Liferay 7?

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Intro

• Asynchronous JavaScript and XML, popularly known
  as Ajax is used with Liferay technology to update
  portlet content or small portion of the whole
  page. Eventually, while creating Liferays MVC
  framework, the resource URLs can be created in
  the JSPs for retrieving messages, XML or even any
  other kind of resource from the Liferay instance.
  This resource URL further invokes corresponding
  MVC resource command class (MVCResourceCommand)
  that ultimately processes the resource request
  and response.

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Resource Command for Ajax in Liferay 7

• The resource command for Ajax calling in Liferay
  MVC framework is built for retrieving data as a
  response from the server. For this, a separate
  class is created as Resource Command class for
  handling Ajax calls. Previously in Liferay 6
  Handler method was used to handle Ajax in the
  portlet controller.
• Example of Resource URL in JSP
• When we hit resource URL from JavaScript or JSP,
  it will find corresponding MVCResourceCommand
  class. We can create our own class by
  implementing the MVCResourceCommand interface or
  extending the BaseMVCResourceCommand class.

1 ltportletresourceURL id"getUserDocuments"var"getUserDocumentsURL" /gt
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• Sample MVC Resource Command Class

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• One has to define _at_Component annotation and
  javax.portlet.name value that will be the
  respective portletId. The portletId can be found
  by the controller class package and controller
  class name.
• For example, if the Controller class have package
  as com.example.learn.portlet and controller class
  name as UserDocumentModulePortlet, then the
  portletId will be com_example_learn_portlet.
  UserDocumentModulePortlet.
• Here, mvc.command.name must match with the id
  attribute in ltportletresourceURLgt.
• This is how Ajax call in Liferay 7 is done.

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• Still in case of any queries, feel free to
  contact our Liferay Consultant!

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• Original Source
• http//www.azilen.com/blog/use-resource-command-aj
  ax-liferay-7/

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