Question

我是JSF和primefaces的新手。我想在文件上传完成时更新数据网格。我累了更新属性，但它没有更新组件。我只有在重新加载页面后才能看到更新的数据网格。

<h:form>

    <p:fileUpload fileUploadListener="#{fileUploadView.handleFileUpload}" mode="advanced" dragDropSupport="false"
                  multiple="true" update=":content:images" allowTypes="/(\.|\/)(gif|jpe?g|png)$/" />

    <p:growl id="messages" showDetail="true" />
</h:form>

        <h:form id="content">
         <p:dataGrid var="image" value="#{dataGridView.images}"  columns="2"
                     rows="12" paginator="true" id="images" rendered="#{not empty dataGridView.images}"
        paginatorTemplate="{CurrentPageReport}  {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}"
        rowsPerPageTemplate="6,12,16" >

        <f:facet name="header">
            Your Album
        </f:facet>

        <p:panel header="#{image.imageName}" style="text-align:center;">
            <h:panelGrid columns="1" style="width:100%">
                <image src="#{image.imageLocation}" style="height: 10%;width:30%;"/> 
            </h:panelGrid>

        </p:panel>

    </p:dataGrid>

</h:form>

handleFileUpload方法

public void handleFileUpload(FileUploadEvent event) {
        currentSession.setAttribute("username","sravanyahoo@gmail.com");
        String userName = (String) currentSession.getAttribute("username");
        String realPath = ctx.getRealPath("/");
        String contextPath = ctx.getContextPath();      
        try{
        UploadedFile uploadedFile = event.getFile();
        String imageLocation = ImageUtils.uploadFile(realPath,contextPath,uploadedFile,userName);
        }
        catch(Exception e)
        {

        }
        helper.updateImageList(userName,dataGridView);
        FacesMessage message = new FacesMessage("Succesful", event.getFile().getFileName() + " is uploaded.");
        FacesContext.getCurrentInstance().addMessage(null, message);

    }

updateImageList方法

public void updateImageList(String userName,DataGridView view){       
        view.setImages(getImagesFromDB(userName));
    }

Answer 1

很可能你的dataGrid在上传和更新之前没有呈现（rendered="#{not empty dataGridView.images}"。如果确实没有，你会遇到jsf bascis之一，如果没有渲染你就无法更新组件。

无法使用primefaces update属性更新组件

1 个答案: