基于grails richUi的评分效果的开发

首先需要安装richuUi插件
创建一个domain：News

class News { 

    String title 
    String content 
    Date   time 

    static hasMany = [rates:Rate] 

    static constraints = { 
        title (blank:false) 
        content (blank:false,type:'text') 
    } 

} 

再创建一个domain：Rate

class Rate { 
    News news 
    String rating = "0" 

    static belongsTo = [news:News] 

    static constraints = { 
    } 

} 

其中News和Rate的关系是一对多的关系。

然后修改news的show.gsp页面：
首先在head标签中增加<resource:rating />
然后增加

              <h5>新闻内容评分：</h5> 
              <g:render template="/rating/rate" model=['id':id,'rating':0] /> 
              <g:set var="a" value="${0}" /> 
              <g:set var="b" value="${0}" /> 
              <g:set var="c" value="${0}" /> 
              <g:set var="d" value="${0}" /> 
              <g:set var="e" value="${0}" /> 
              <g:each in="${newsInstance.rates}"> 
                <g:if test="${it.rating == '1'}"> 
                  <g:set var="a" value="${a+1}" /> 
                </g:if> 
                <g:elseif test="${it.rating == '2'}"> 
                  <g:set var="b" value="${b+1}" /> 
                </g:elseif> 
                <g:elseif test="${it.rating == '3'}"> 
                  <g:set var="c" value="${c+1}" /> 
                </g:elseif> 
                <g:elseif test="${it.rating == '4'}"> 
                  <g:set var="d" value="${d+1}" /> 
                </g:elseif> 
                <g:elseif test="${it.rating == '5'}"> 
                  <g:set var="e" value="${e+1}" /> 
                </g:elseif> 
              </g:each> 
            评 1分的个数：${a}<br> 
            评 2分的个数：${b}<br> 
            评 3分的个数：${c}<br> 
            评 4分的个数：${d}<br> 
            评 5分的个数：${e}<br> 

其中，_rate.gsp模板的代码如下：

<% 
        def id= newsInstance?.id 
%> 
<%@ page contentType="text/html;charset=UTF-8" %> 
<richui:rating dynamic="true" id="${id}" units="5" rating="${rating}" controller="rating" action="rate" /> 

这时，我们用到了RatingController，其代码如下：

class RatingController { 

    def rate = { 
        def rating = params.rating 
        def id = params.id 
        def news = News.get(new Long(id)) 
        def rate = new Rate(rating:rating) 
        news.addToRates(rate) 
        news.save() 
        render(template: "rate", model: [id:id ,rating: rating]) 
    } 

} 

好了，最终的结果：

[img]http://dl.iteye.com/upload/attachment/220131/e9e6b8fc-2e7c-300a-934d-19ebdcc0dac8.jpg[/img]