Updating the View

Refactoring the Prototype
Step 5 of 6

You updated more than just the basic mechanism behind creating the entry–you completely changed its method and structure. You must, therefore, update the UI as well. To do that, you must create a new JSP for managing guestbooks, and update the existing JSPs.

  1. First, you must update your dependencies. In your guestbook-web module, open init.jsp from /src/main/resources/META-INF/resources/. In this file, add the following additional dependencies:

    <%@ taglib uri="http://liferay.com/tld/frontend" prefix="liferay-frontend" %>
    <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
    <%@ taglib uri="http://liferay.com/tld/security" prefix="liferay-security" %>
    <%@ page import="java.util.List" %>
    <%@ page import="com.liferay.portal.kernel.util.ParamUtil" %>
    <%@ page import="com.liferay.portal.kernel.util.HtmlUtil" %>
    <%@ page import="com.liferay.portal.kernel.util.StringPool" %>
    <%@ page import="com.liferay.portal.kernel.model.PersistedModel" %>
    <%@ page import="com.liferay.portal.kernel.dao.search.SearchEntry" %>
    <%@ page import="com.liferay.portal.kernel.dao.search.ResultRow" %>
    <%@ page import="com.liferay.docs.guestbook.model.Guestbook" %>
    <%@ page import="com.liferay.docs.guestbook.service.EntryLocalServiceUtil" %>
    <%@ page import="com.liferay.docs.guestbook.service.GuestbookLocalServiceUtil" %>
    <%@ page import="com.liferay.docs.guestbook.model.Entry" %> 
  2. Open the view.jsp file found in /resources/META-INF/resources/guestbookwebportlet. Replace this file’s contents with the following code:

    <%@include file="../init.jsp"%>
    long guestbookId = Long.valueOf((Long) renderRequest
    <aui:button-row cssClass="guestbook-buttons">
        <portlet:renderURL var="addEntryURL">
            <portlet:param name="mvcPath" value="/guestbookwebportlet/edit_entry.jsp" />
            <portlet:param name="guestbookId"
                value="<%=String.valueOf(guestbookId)%>" />
        <aui:button onClick="<%=addEntryURL.toString()%>" value="Add Entry"></aui:button>
    <liferay-ui:search-container total="<%=EntryLocalServiceUtil.getEntriesCount()%>">
                        guestbookId, searchContainer.getStart(),
                        searchContainer.getEnd())%>" />
        className="com.liferay.docs.guestbook.model.Entry" modelVar="entry">
        <liferay-ui:search-container-column-text property="message" />
        <liferay-ui:search-container-column-text property="name" />
    <liferay-ui:search-iterator />

This view.jsp now retrieves the entries from the guestbook it gets from the render method. It does this inside a Liferay DXP construct called a Search Container. This is a front-end component that makes it easy to display data in rows and columns. The EntryLocalServiceUtil call retrieves the data from your new Service Builder-based back-end. Otherwise, this JSP is much the same: you still have an Add Entry button with its corresponding URL.

Next, you need to edit the edit_entry.jsp:

  1. Open edit_entry.jsp and replace the existing code with this:

    <%@include file="../init.jsp" %>
    long entryId = ParamUtil.getLong(renderRequest, "entryId");
    Entry entry = null;
    if (entryId > 0) {
      entry = EntryLocalServiceUtil.getEntry(entryId);
    long guestbookId = ParamUtil.getLong(renderRequest, "guestbookId");
    <portlet:renderURL var="viewURL">
    <portlet:param name="mvcPath" value="/guestbookwebportlet/view.jsp"></portlet:param>
    <portlet:actionURL name="addEntry" var="addEntryURL"></portlet:actionURL>
    <aui:form action="<%= addEntryURL %>" name="<portlet:namespace />fm">
    <aui:model-context bean="<%= entry %>" model="<%= Entry.class %>" />
            <aui:input name="name" />
            <aui:input name="email" />
            <aui:input name="message" />
            <aui:input name="entryId" type="hidden" />
            <aui:input name="guestbookId" type="hidden" value='<%= entry == null ? guestbookId : entry.getGuestbookId() %>'/>
            <aui:button type="submit"></aui:button>
            <aui:button type="cancel" onClick="<%= viewURL.toString() %>"></aui:button>

    This is much the same form, though there are more fields now. Using some AlloyUI tags, the form is linked to your Entry entity. The two hidden fields contain the new entryId and the guestbookId for the guestbook the new entry belongs to. The submit button is an ActionURL that executes the addEntry method in the controller (your portlet class).

Congratulations! You’ve now successfully replaced your prototype back-end with a real, database-driven back-end. Next, you’ll do a quick review and deploy your application.

« Integrating the New Back-endFitting it All Together »
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