Grails 3中的下拉列表

// 在Controller中
class MyController {
    def index() {
        render(view: 'index')
    }
}

// 在GSP页面（index.gsp）中
<g:form controller="my" action="submit">
    <label for="gender">Gender:</label>
    <g:select id="gender" name="gender" from="${['Male', 'Female', 'Other']}" />
    <g:submitButton name="submit" value="Submit" />
</g:form>

class Gender {
    String name
}

class MyController {
    def index() {
        List<Gender> genders = Gender.list()
        [genders: genders]
    }

    def submit() {
        // 处理提交逻辑
    }
}

<g:form controller="my" action="submit">
    <label for="gender">Gender:</label>
    <g:select id="gender" name="gender" from="${genders}" optionKey="id" optionValue="name" />
    <g:submitButton name="submit" value="Submit" />
</g:form>