how to point root folder of DAM Display portlet programatically - liferay

Question

How to set one of the folders as root folder of Documents And Media Display portlet by programmatically.PFA image

Answer 1

Liferay Major Version
Your question is tagged as Liferay 6 and Liferay 7. The two releases are drastically different. This answer assumes you are using Liferay 6.x since you are asking about the DDM portlet as opposed to the OSGI module.
Programmatically setting that input resource to default as a folder of your choice requires you to create a JavaServer Page hook for a JSP in the Document Library Display portlet. I am going to briefly explain how to create the JSP hook before getting into particulars.
Create a Hook
From Liferay's Knowledge base
From your command line terminal, navigate to your Plugins SDK’s hooks folder. To create a hook project, you must execute the create script. Here’s the format to follow in executing the script:
create.[sh|bat] [project-name] "[Hook Display Name]"
On Linux and Mac OS X, you’d enter a command similar to the one in this example:
./create.sh doc-lib-disp-hook "Document Library Display Hook"
On Windows, you’d enter a command similar to the one in this example:
create.bat doc-lib-disp-hook "Document Library Display Hook"
Liferay IDE’s New Project wizard and the create scripts generate hook projects in your Plugin SDK’s hooks folder. The Plugins SDK automatically appends “-hook” to your project name.
You will need to have Apache ANT installed for this to work. Please reference the following documentation if you need to install it.
https://www.mkyong.com/ant/how-to-install-apache-ant-on-windows/
Once the hook is created open it in your Liferay IDE or Liferay Developers Studio (or Eclipse).
In your IDE click the down arrow right below File (top left corner)
Choose Liferay Plugin Project from Existing Source
Double click on the doc-lib-disp-hook folder in your Plugin's SDK Hook directory to open.
You should see something similar to this (with different name).
Override JSP
Now that you have successfully created a hook plugin, we need to override the necessary file. There are two files in particular that we need for this hook
html/portlet/document_library_display/configuration.jsp
html/portlet/document_library/init.jsp
We need both files to logically walk through this example although we only need to actually override one of them.
To override the JSP's execute the following steps
Under your META-INF folder create a new directory called custom_jsp
Open up liferay-hook.xml in Overview mode
Click the Green Plus sign (to the right of Custom JSP label)
Search for both files listed above (copy and paste the URL into the window) then click save.
You will now notice you have the following directory structure.
Let's first open the configuration.jsp. This is the code that produces the GUI you took a screen shot of. Find the following code block.
<aui:field-wrapper label="root-folder">
<div class="input-append">
<liferay-ui:input-resource id="rootFolderName" url="<%= rootFolderName %>" />
<aui:button name="openFolderSelectorButton" value="select" />
<%
String taglibRemoveFolder = "Liferay.Util.removeFolderSelection('rootFolderId', 'rootFolderName', '" + renderResponse.getNamespace() + "');";
%>
<aui:button disabled="<%= rootFolderId <= 0 %>" name="removeFolderButton" onClick="<%= taglibRemoveFolder %>" value="remove" />
</div>
</aui:field-wrapper>
Inside that block you will see the Root Folder element you wish to set.
<liferay-ui:input-resource id="rootFolderName" url="<%= rootFolderName %>" />
As you can see the folder's url is already set by default to the variable rootFolderName. We need to find where that variable is first initialized.
We need not modify this file at all. I had you include it and open it so you can follow through logically.
If you notice rootFolderName is not initialized anywhere in the configuration.jsp file. Therefore we need to investigate the init.jsp file because it is an include at the top of the page. If you open that file you will notice the following block.
String portletResource = ParamUtil.getString(request, "portletResource");
if (layout.isTypeControlPanel()) {
portletPreferences = PortletPreferencesLocalServiceUtil.getPreferences(themeDisplay.getCompanyId(), scopeGroupId, PortletKeys.PREFS_OWNER_TYPE_GROUP, 0, PortletKeys.DOCUMENT_LIBRARY, null);
}
long rootFolderId = PrefsParamUtil.getLong(portletPreferences, request, "rootFolderId", DLFolderConstants.DEFAULT_PARENT_FOLDER_ID);
String rootFolderName = StringPool.BLANK;
if (rootFolderId != DLFolderConstants.DEFAULT_PARENT_FOLDER_ID) {
try {
Folder rootFolder = DLAppLocalServiceUtil.getFolder(rootFolderId);
rootFolderName = rootFolder.getName();
}
catch (NoSuchFolderException nsfe) {
}
}
This code is basically saying we are going to initialize rootFolderName blank. However if rootFolderId is set higher than 0 either by
Portlet preferences, or
Request Parameters
then we will set rootFolderName accordingly.
Conclusion
If you want to set rootFolderName to a folder of your choice programmatically by default you can a few things. The easiest thing to do would be to get the folder's id and modify the code like this
long folderIdConstant = 999999L; // place folder id here
long rootFolderId = PrefsParamUtil.getLong(portletPreferences, request, "rootFolderId", folderIdConstant );
That would set the default root folder programmatically. Just build and deploy now.