Question

我很困惑为什么组件p:fileUpload在fileUploadListener显示组件后没有调用p:ajax。如果我把它放在panelGrid之外，或者甚至将它们删除，那就行了。

什么不起作用：

<div class="pure-control-group"> 
    <label for="mostraNoIndex">Slideshow</label>
    <p:selectBooleanCheckbox value="#{destaqueCadastrarBean.d.apareceNoSlide}">
        <p:ajax event="change" update="upload"></p:ajax>
    </p:selectBooleanCheckbox>
</div>                                      

<h:panelGrid id="upload">
    <h:panelGrid rendered="#{destaqueCadastrarBean.d.apareceNoSlide}">
        <div class="pure-control-group"> 
            <label for="mostraNoIndex">Imagem</label>
            <p:fileUpload fileUploadListener="#{destaqueCadastrarBean.handleFileUpload}" mode="advanced" dragDropSupport="true" sizeLimit="100000000000" fileLimit="1" allowTypes="/(\.|\/)(gif|jpe?g|png)$/" />                                    
        </div>
   </h:panelGrid>
</h:panelGrid>

什么有效：

<div class="pure-control-group"> 
    <label for="mostraNoIndex">Slideshow</label>
    <p:selectBooleanCheckbox value="#{destaqueCadastrarBean.d.apareceNoSlide}">
    </p:selectBooleanCheckbox>
</div>  

<div class="pure-control-group"> 
    <label for="mostraNoIndex">Imagem</label>
    <h:fileUpload fileUploadListener="#{destaqueCadastrarBean.handleFileUpload}" mode="advanced" dragDropSupport="true" sizeLimit="100000000000" fileLimit="1" allowTypes="/(\.|\/)(gif|jpe?g|png)$/" />                                    
</div>

Answer 1

刚刚找到了解决方案。被调用的bean是RequestScoped，将其更改为ViewScoped。我猜是因为加载表单时请求bean而p：fileUpload只能在创建bean之后出现，组件才能到达bean。使用视图范围，bean可用于随后出现的组件。如果某人有更技术性和清晰的解释，我想更好地理解。

p：由p：ajax渲染后，fileUpload无法正常工作

1 个答案: