Learn Java for Web Development

tina meador (Tina Meador) 2019-07-26 16:01:33 UTC #1

340 CHAPTER 7: Rapid Web Development with Grails

40.${fieldValue(bean: bookInstance, field: "price")}
41.
42.${fieldValue(bean: bookInstance, field: "isbn")}
43.
44.
45.</g:each>
46.
47.
48.

49.
50.

51.

52.
53.

   Line 14: The <g:link> tag creates a link to the create action of the

BookController.

   Line 19: The <g:if> tag checks for the existence of flash.message that was

stored in the action and, if found, displays it.

   Lines 26 to 31: The <g:sortableColumn> tag is used to provide sorting on our

list view.

   Lines 35 to 45: The <g:each> tag iterates over the bookInstanceList. Each item

in the list is assigned to the bookInstance variable. The body of the <g:each>

tag fills in the table row with the properties of the bookInstance. In the line

<tr class="${(i % 2) == 0? 'even' : 'odd'}">, a Groovy expression is used

to determine the style class of the <tr>, and the fieldValue( ) method is used

to render the value of each Book property.

   Line 49: The <g:paginate> tag displays the pagination controls if there are

enough elements in the list view. The bookInstanceTotal is used from

Listing 7-19, as mentioned earlier.

The Create View

The create view is illustrated in Listing 7-28.

Listing 7-28. create.gsp

1.<%@ page import="bookstore.Book" %>
2.<!DOCTYPE html>
3.
4.
5.
6.
7.<g:message code="default.create.label" args="[entityName]" />
8.
9.
10.<g:message code="default.link.skip.label"
default="Skip to content…"/>

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