Truncating text in Liferay velocity

[Mahmud Hossain, geändert vor 11 Jahren.]

I'm looking for ways to truncate text using velocity in liferay. I can use javascript to do this work, but i think it would more suitable for me to truncate text using velocity. I found this class called DisplayTool which let's you truncate text but i don't think it's included with liferay.

[David H Nebinger, geändert vor 11 Jahren.]

When constructing a velocity context, most of the inserted object references are hard coded in com.liferay.portal.velocity.VelocityVariablesImpl.

However, the code is actually somewhat dynamic in that it will also inject values from the "VM_VARIABLES" attribute on the HttpServletRequest.

So you could define a servlet filter for the ROOT application that implements a wrapper around the HttpServletRequest. In your wrapper, you'd override the getAttribute() method, something like this:

public Object getAttribute(final String attributeName) {
  if ((attributeName == null) || (attributeName.trim().length() < 1) return wrappedRequest.getAttribute(attributeName);

  if (!(WebKeys.VM_VARIABLES.equals(attributeName))) return wrappedRequest.getAttribute(attributeName);

  Map<string,object> vmVars = (Map<string,object>) wrappedRequest.getAttribute(attributeName);

  if (vmVars == null) vmVars = new HashMap();

  if (vmVars.get("displayTool") == null) {
    vmVars.put("displayTool", new DisplayTool());
  }

  return vmVars;
}</string,object></string,object>

This will allow you to dynamically inject your DisplayTool instance and will make it available to the velocity context and therefore your velocity templates.

[Hitoshi Ozawa, geändert vor 11 Jahren.]

Following page may help you.

http://www.sergiy.ca/how-to-create-custom-tools-for-apache-velocity/