当在Dockbar上点击Add->More...后，就进入了layout_configuration:

这也是一个portlet（Liferay内核中的一个特殊的portlet),portlet_id为87，参见liferay-portlet.xml:

1. <portlet>
2. <portlet-name>87</portlet-name>
3. <icon>/html/icons/default.png</icon>
4. <struts-path>layout_configuration</struts-path>
5. <use-default-template>false</use-default-template>
6. <show-portlet-access-denied>false</show-portlet-access-denied>
7. <show-portlet-inactive>false</show-portlet-inactive>
8. <private-request-attributes>false</private-request-attributes>
9. <private-session-attributes>false</private-session-attributes>
10. <render-weight>50</render-weight>
11. <add-default-resource>true</add-default-resource>
12. <system>true</system>
13. </portlet>

这个portlet对应的页面在/html/portlet/layout_configuration/view.jsp中：

1. <%@ include file="/html/portlet/layout_configuration/init.jsp" %>
2. <c:if test="<%= themeDisplay.isSignedIn() && (layout != null) && (layout.isTypePortlet() || layout.isTypePanel()) %>">
3. <%
4. PortletURL refererURL = renderResponse.createActionURL();
5. refererURL.setParameter("updateLayout", "true");
6. %>
7. <div id="portal_add_content">
8. <div class="portal-add-content">
9. <aui:form action='<%= themeDisplay.getPathMain() + "/portal/update_layout?p_l_id=" + plid + "&p_v_l_s_g_id=" + themeDisplay.getParentGroupId() %>' method="post" name="fm" useNamespace="<%= false %>">
10. <aui:input name="doAsUserId" type="hidden" value="<%= themeDisplay.getDoAsUserId() %>" />
11. <aui:input name="<%= Constants.CMD %>" type="hidden" value="template" />
12. <aui:input name="<%= WebKeys.REFERER %>" type="hidden" value="<%= refererURL.toString() %>" />
13. <aui:input name="refresh" type="hidden" value="<%= true %>" />
14. <c:if test="<%= layout.isTypePortlet() %>">
15. <div class="portal-add-content-search">
16. <span id="portal_add_content_title"><liferay-ui:message key="search-applications-searches-as-you-type" /></span>
17. <aui:input cssClass="lfr-auto-focus" id="layout_configuration_content" label="" name="layout_configuration_content" onKeyPress="if (event.keyCode == 13) { return false; }" />
18. </div>
19. </c:if>
20. <%
21. UnicodeProperties typeSettingsProperties = layout.getTypeSettingsProperties();
22. Set panelSelectedPortlets = SetUtil.fromArray(StringUtil.split(typeSettingsProperties.getProperty("panelSelectedPortlets")));
23. PortletCategory portletCategory = (PortletCategory)WebAppPool.get(company.getCompanyId(), WebKeys.PORTLET_CATEGORY);
24. portletCategory = _getRelevantPortletCategory(permissionChecker, portletCategory, panelSelectedPortlets, layoutTypePortlet, layout, user);
25. List categories = ListUtil.fromCollection(portletCategory.getCategories());
26. categories = ListUtil.sort(categories, new PortletCategoryComparator(locale));
27. int portletCategoryIndex = 0;
28. Iterator itr = categories.iterator();
29. while (itr.hasNext()) {
30. PortletCategory curPortletCategory = (PortletCategory)itr.next();
31. if (curPortletCategory.isHidden()) {
32. continue;
33. }
34. request.setAttribute(WebKeys.PORTLET_CATEGORY, curPortletCategory);
35. request.setAttribute(WebKeys.PORTLET_CATEGORY_INDEX, String.valueOf(portletCategoryIndex));
36. %>
37. <liferay-util:include page="/html/portlet/layout_configuration/view_category.jsp" />
38. <%
39. portletCategoryIndex++;
40. }
41. %>
42. <c:if test="<%= layout.isTypePortlet() %>">
43. <div class="portlet-msg-info">
44. <liferay-ui:message key="to-add-a-portlet-to-the-page-just-drag-it" />
45. </div>
46. </c:if>
47. <c:if test="<%= !layout.isTypePanel() && permissionChecker.isOmniadmin() %>">
48. <%
49. Group controlPanelGroup = GroupLocalServiceUtil.getGroup(company.getCompanyId(), GroupConstants.CONTROL_PANEL);
50. long controlPanelPlid = LayoutLocalServiceUtil.getDefaultPlid(controlPanelGroup.getGroupId(), true);
51. PortletURLImpl pluginsURL = new PortletURLImpl(request, PortletKeys.PLUGIN_INSTALLER, controlPanelPlid, PortletRequest.RENDER_PHASE);
52. pluginsURL.setPortletMode(PortletMode.VIEW);
53. pluginsURL.setRefererPlid(plid);
54. %>
55. <p class="lfr-install-more">
56. <aui:a href="<%= pluginsURL.toString() %>" label="install-more-applications" />
57. </p>
58. </c:if>
59. </aui:form>
60. </div>
61. </div>
62. </c:if>
63. <c:if test="<%= !themeDisplay.isSignedIn() %>">
64. <liferay-ui:message key="please-sign-in-to-continue" />
65. </c:if>

而这里面所有portlet以及分类都是用循环所包含进来的，见第55行：

所以每个Portlet分类以及其中的portlet都在/html/portlet/layout_configuration/view_category.jsp中：

1. <%@ include file="/html/portlet/layout_configuration/init.jsp" %>
2. ...
3. <div class="lfr-add-content <%= layout.isTypePortlet() ? "collapsed" : "" %>" id="<portlet:namespace />portletCategory<%= portletCategoryIndex %>">
4. <h2>
5. <span><%= Validator.isNotNull(externalPortletCategory) ? externalPortletCategory : LanguageUtil.get(pageContext, portletCategory.getName()) %></span>
6. </h2>
7. <div class="lfr-content-category <%= layout.isTypePortlet() ? "aui-helper-hidden" : "" %>">
8. ...
9. <c:choose>
10. <c:when test="<%= layout.isTypePortlet() %>">
11. <div
12. class="lfr-portlet-item <c:if test="<%= portletLocked %>">lfr-portlet-used</c:if> <c:if test="<%= portletInstanceable %>">lfr-instanceable</c:if>"
13. id="<portlet:namespace />portletItem<%= portlet.getPortletId() %>"
14. instanceable="<%= portletInstanceable %>"
15. plid="<%= plid %>"
16. portletId="<%= portlet.getPortletId() %>"
17. title="<%= PortalUtil.getPortletTitle(portlet, application, locale) %>"
18. >
19. <p><%= PortalUtil.getPortletTitle(portlet, application, locale) %> <a href="javascript:;"><liferay-ui:message key="add" /></a></p>
20. </div>
21. <input id="<portlet:namespace />portletItem<%= portlet.getPortletId() %>CategoryPath" type="hidden" value="<%= divId.toString().replace(':', '-') %>" />
22. ...
23. <div
24. class="lfr-portlet-item lfr-archived-setup"
25. id="<portlet:namespace />portletItem<%= portletItem.getPortletItemId() %>"
26. instanceable="<%= portletInstanceable %>"
27. plid="<%= plid %>"
28. portletId="<%= portlet.getPortletId() %>"
29. portletItemId="<%= portletItem.getPortletItemId() %>"
30. title="<%= HtmlUtil.escape(portletItem.getName()) %>"
31. >
32. <p><%= HtmlUtil.escape(portletItem.getName()) %> <a href="javascript:;"><liferay-ui:message key="add" /></a></p>
33. </div>
34. <input id="<portlet:namespace />portletItem<%= portletItem.getPortletItemId() %>CategoryPath" type="hidden" value="<%= divId.toString().replace(':', '-') %>" />
35. <%
36. }
37. %>
38. </c:when>
39. <c:otherwise>
40. <div>
41. <a href="<liferay-portlet:renderURL portletName="<%= portlet.getRootPortletId() %>" windowState="<%= WindowState.MAXIMIZED.toString() %>"></liferay-portlet:renderURL>"><%= PortalUtil.getPortletTitle(portlet, application, locale) %></a>
42. </div>
43. </c:otherwise>
44. </c:choose>
45. <%
46. }
47. %>
48. </div>
49. </div>
50. <input id="<portlet:namespace />portletCategory<%= portletCategoryIndex %>CategoryPath" type="hidden" value="<%= newCategoryPath.replace(':', '-') %>" />
51. <%
52. }
53. %>

从这里很容易看出，每个分类对应的代码段是第6行开始，它的id为id="<portlet:namespace />portletCategory<%= portletCategoryIndex %>，而每个portlet的对应的代码段是从第17行开始，它对应的id为id="<portlet:namespace />portletItem<%= portlet.getPortletId() %>

我们来验证下：比如我们为了如下的显示：

对应的，因为layout_configuration对应的portletId为87（上文已说），对应的<portlet:namespace>为_87_。这个分类是第9个分类，而这个分类中包含的2个Portlet对应的id分别为34,67,见liferay-display.xml:

1. ..
2. <category name="category.shopping">
3. <portlet id="34" />
4. <portlet id="67" />
5. </category>
6. ..

所以，分类的id为_87_portletCategory9,而两个portlet的id分别为_87_portletItem67和_87_portletItem34，对比页面源码，果然这样：

本文转自 charles_wang888 51CTO博客，原文链接：http://blog.51cto.com/supercharles888/900924，如需转载请自行联系原作者