http://www.tuicool.com/articles/7JRVv2
<%@ page import="com.mrhaki.grails.sample.Book" contentType="text/html;charset=UTF-8" %><html><head> <title>Simple GSP page</title> <meta name="layout" content="main"/> <style> p { margin-top: 20px; margin-bottom: 5px;} </style></head><body> <h1>Select</h1> <p>Use title property of book for option values</p> <g:select from="${Book.list()}" optionKey="id" optionValue="title" name="bookSimple"/> <p>Use closure for optionValue</p> <g:select from="${Book.list()}" optionKey="id" optionValue="${{ book -> "${book.title} - ${book.isbn}" }}" name="bookCustom"/> <g:set var="bookOptionValueFormatter" value="${{ book -> "${book.title} (${book.isbn}, ${book.numberOfPages})" }}"/> <p>Use bookOptionValueFormatter that is defined as variable on this page</p> <g:select from="${Book.list()}" optionKey="id" optionValue="${bookOptionValueFormatter}" name="bookVar"/> <p>Use bookFormatter that is passed as a model property from SampleController.</p> <g:select from="${Book.list()}" optionKey="id" optionValue="${bookFormatter}" name="bookModel"/></body></html>
When we run the application and open the page in a web browser we get the following HTML source:
...<h1>Select</h1><p>Use title property of book for option values</p><select name="bookSimple" id="bookSimple" > <option value="1" >It</option> <option value="2" >The Stand</option></select><p>Use closure for optionValue</p><select name="bookVar" id="bookCustom" > <option value="1" >It - 0451169514</option> <option value="2" >The Stand - 0307743683</option></select><p>Use bookOptionValueFormatter that is defined as variable on this page</p><select name="bookVar" id="bookVar" > <option value="1" >It (0451169514, 1104)</option> <option value="2" >The Stand (0307743683, 1472)</option></select><p>Use bookFormatter that is passed as a model property from SampleController.</p><select name="bookModel" id="bookModel" > <option value="1" >It (pages: 1104)</option> <option value="2" >The Stand (pages: 1472)</option></select>...