grails中的下拉列表

在我的程序中，这是一个项目跟踪器，我有一个表，其中行对应于项目，列对应于项目的不同信息(名称，到期日，状态等)。最后一列应该是"More"列，当您按下它时，它应该显示项目的附加属性的下拉列表。如何在Grails中做到这一点?下面是我的清单。gsp:

<calendar:resources lang="en"/>
<!doctype html>
<html>
    <head>
        <meta name="layout" content="layoutMain"/>
        <g:set var="entityName" value="${message(code: 'project.label', default: 'Project')}" />
        <title><g:message code="default.list.label" args="[entityName]" /></title>
    </head>
    <body>
        <div class="nav" role="navigation">
            <ul>
                <li><g:link class="create" action="create"><button>New Project</button></g:link></li>
            </ul>
        </div>
        <div id="list-project" class="content scaffold-list" role="main">
            <h1><g:message code="default.list.label" args="[entityName]" /></h1>
            <g:if test="${flash.message}">
            <div class="message" role="status">${flash.message}</div>
            </g:if>
            <table>
                <thead>
                    <tr>
                        <g:sortableColumn property="name" title="${message(code: 'project.name.label', default: 'Name')}" />
                        <g:sortableColumn property="dueDate" title="${message(code: 'project.dueDate.label', default: 'Due Date')}" />
                        <g:sortableColumn property="startDate" title="${message(code: 'project.startDate.label', default: 'Start Date')}" />
                        <g:sortableColumn property="status" title="${message(code: 'project.name.label', default: 'Status')}" />
                        <g:sortableColumn property="requirements" title="${message(code: 'project.name.label', default: 'Requirements')}" />
                        <g:sortableColumn property="design" title="${message(code: 'project.name.label', default: 'Design')}" />
                        <g:sortableColumn property="development" title="${message(code: 'project.name.label', default: 'Development')}" />
                        <g:sortableColumn property="qa" title="${message(code: 'project.name.label', default: 'QA')}" />
                        <g:sortableColumn property="ua" title="${message(code: 'project.name.label', default: 'UA')}" />
                        <g:sortableColumn property="delivery" title="${message(code: 'project.name.label', default: 'Delivery')}" />
                        <g:sortableColumn property="more" title="${message(code: 'project.name.label', default: 'More')}" />   
                    </tr>
                </thead>
                <tbody>
                <g:each in="${projectInstanceList}" status="i" var="projectInstance">
                    <tr class="${(i % 2) == 0 ? 'even' : 'odd'}">
                        <td><g:link action="show" id="${projectInstance.id}">${fieldValue(bean: projectInstance, field: "name")}</g:link></td>
                        <td><g:formatDate date="${projectInstance.dueDate}" /></td>
                        <td><g:formatDate date="${projectInstance.startDate}" /></td>
                        <td><g:link action="show" id="${projectInstance.id}">${fieldValue(bean: projectInstance, field: "status.name")}</g:link></td>
                        <td><g:link action="show" id="${projectInstance.id}">${fieldValue(bean: projectInstance, field: "requirements.name")}</g:link></td>
                        <td><g:link action="show" id="${projectInstance.id}">${fieldValue(bean: projectInstance, field: "design.name")}</g:link></td>
                        <td><g:link action="show" id="${projectInstance.id}">${fieldValue(bean: projectInstance, field: "development.name")}</g:link></td>
                        <td><g:link action="show" id="${projectInstance.id}">${fieldValue(bean: projectInstance, field: "qa.name")}</g:link></td>
                        <td><g:link action="show" id="${projectInstance.id}">${fieldValue(bean: projectInstance, field: "ua.name")}</g:link></td>
                        <td><g:link action="show" id="${projectInstance.id}">${fieldValue(bean: projectInstance, field: "delivery.name")}</g:link></td>
                        <td><g:link action="show" id="${projectInstance.id}">${fieldValue(bean: projectInstance, field: "delivery.name")}</g:link></td>
                    </tr>
                </g:each>
                </tbody>
            </table>
            <div class="pagination">
                <g:paginate total="${projectInstanceTotal}" />
            </div>
        </div>
    </body>
</html>

如果你想使用标准的Grails，你可以在Grails中使用g:select标签创建一个下拉列表。一个更好的解决方案可能是使用jQuery(或类似的)来显示隐藏HTML块。

如果您的项目域看起来像:

class Project {
    String name
...
    // more info
    String  attr1
    int     attr2
    boolean isAttr3
}

您可以为域添加一个方便的方法，将字段聚合到一个列表(或者可能是另一个对象)中，该列表可用于下拉框。例如

// utility getter to aggregate the fields into an array 
def getMoreInfo() {
    [attr1, attr2, isAttr3]
}

那么你可以在GSP中使用以下命令:

<td><g:select name="more" from="${projectInstance.moreInfo}" /></td>

在单击更多列时，您可以向某些操作发送Ajax请求，该操作可以为您带来两个数组的JSON:

{extraColumns:{c1,c2}, columnValues:{{v11,v12}, {v21,v22}}}

在Ajax的响应中，您可以解析JSON并为标题创建附加列，为行创建附加列值。

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