Enable Transactional cache in Liferay

The property 'transactional.cache.enable' must be added to the Portal-ext.properties file.
If set true,

transactional.cache.enable=true

cache updations are done when transactions commit successfully to the database. Also, on  transactions rollback caches rolledback. This can be sometimes performace blocker.

RSS Portlet Connection Timeout

The property 'rss.connection.timeout' must be added to the Portal-ext.properties file.
Set the timeout in milliseconds like,
rss.connection.timeout=2000
This makes the RSS reades wait untill 2 seconds for reading the RSS feeds before timeout.

Show / Hide Lookand Feel Icon on a Liferay portlet

The property 'portlet.css.enabled' must be added to the Portal-ext.properties file.

If made true,

portlet.css.enabled=true

# shows the 'Look and Feel' icon on the portlet titlebar. Enabling the user to edit it.This is default.

If made false,

portlet.css.enabled=false

# hides the 'Look and Feel' icon on the portlet titlebar . Disabling it can speed up the portal performance.

How to get the current logged in user in liferay

There are more than one way to do this. Let's look at some of the options available.

1. User user = (User) request.getAttribute(WebKeys.USER);
   The User class is the Liferay's model User class.
   
   
2. ThemeDisplay td  = (ThemeDisplay) request.getAttribute( WebKeys.THEME_DISPLAY );
   User user = td.getUser();
   
   This ' ThemeDisplay 'class can be used to get various information about the portal page,user and theme. Classes ThemeDisplay, User and WebKeys are available in portal-service.jar
   
   
3. User currentUser = PortalUtil.getUser( request );
   
   The 'PortalUtil' has various utility functions , which come handy during Liferay Programming. This is also a part of the Portal-service.jar.
   
   
4. LiferayFacesContext liferayFacesContext = LiferayFacesContext.getInstance();
   User currentUser=liferayFacesContext.getUser();
   
   The class 'PortalFacesContext' has been renamed to 'LiferayFacesContext'.This class exists in order to assist with migrating old JSF 1.2 based projects from the legacy PortletFaces-Tools project to the new LiferayFaces project.
   
   Hope It helps you in your portal programming. Happy Coding :)
   
   
   

Add Javascript to Ice Faces or Facelets

There are several ways to add JavaScript code to an ice faces page. One of which is explained here.The "Direct to Dom" (akaD2D) rendering of icefaces makes it difficult to add javascript or any other code to it.

Q. Where to add the code? .
Ans. The answer is to put the < script type="text/javascript"> just code after the < ice:root> between < html> < head> .add the javascript in the similar way as you add it in jsp/html. then close the tag and at the end before closing the root (i.e < /ice:root> ) add the < /html> tag.

Q. How to call an icefaces componet?
Ans. Use the formname:componentid format to use it in the javascript function.

Q. How to use the body onload thing without using body tag.
Ans. The answer lies in using the window event.

Here is an example which makes everything clear


< jsp:root version="2.0" f="http://java.sun.com/jsf/core" h="http://java.sun.com/jsf/html" ice="http://www.icesoft.com/icefaces/component" jsp="http://java.sun.com/JSP/Page">
< f:view>
< script type="text/javascript>
function setFocusOnLogin(){ document.getElementById("icefaces_formaname:icefaces_component_id").focus(); }//its used to call the icefaces component's focus event
window.attachEvent("onload", setFocusOnLogin);//like body onload , its called on page load < /script>
< ice:portlet>
< ice:form id="icefaces_formaname">
< ice:inputtext id="icefaces_component_id" size="10">
< /ice:inputtext>
< /ice:form>
< /ice:portlet>
< /f:view>
< /jsp:root>

Hope you get it. For any concerns feel free to post a comment.