Question

我在selectOneMenu中获得价值有问题，我尝试在网络上搜索其他示例，它类似但不起作用。

让我解释一下......你可以在下面找到我的XHTML页面：

xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:p="http://primefaces.org/ui"
template="/template/template.xhtml">

<ui:define name="content">

    <script>
        function setUploadFilesCount() {
            var i = 0;
            var numberOfFiles = $('.ui-fileupload-preview').size();
            var input = document.getElementById('fileupload-multi-fix-input');
            input.value = numberOfFiles;
            input.onchange();           
        }   
  </script>

    <ui:include src="/sections/crud/scc/sccReport.xhtml"/>

    <br />
    <br />
    <br />  

    <h:form enctype="multipart/form-data">
        <p:growl id="messages" showDetail="true" />

        <p:accordionPanel activeIndex="null">
            <p:tab title="Allowed Report Types:">
                <h:panelGrid columns="1" cellpadding="20">
                    <h:outputText
                        value="blablablablablablabla" />

                    <h:outputText
                        value="blablablablablablabla" />    

                    <h:outputText
                        value="blablablablablablabla" />    
                </h:panelGrid>
            </p:tab>
        </p:accordionPanel>

        <br />
        <br />

        <h4>1) Select the Report:</h4>
                <h:selectOneMenu id="reportOption" value="#{sccReportController.reportOption}" required="true" label="Report Option">
                    <f:selectItem itemLabel="Select one" itemValue="" noSelectionOption="true" />
                    <f:selectItem itemLabel="Report 1" itemValue="report1" />
                    <f:selectItem itemLabel="Report 2" itemValue="report2" />
                    <f:selectItem itemLabel="Report 3" itemValue="report3" />
                </h:selectOneMenu>
        <br />
        <br />

        <h4>2) Select and upload all log files that will be processed:</h4>

        <p:fileUpload 
            fileUploadListener="#{sccReportController.handleFileUpload}" 
            mode="advanced" 
            dragDropSupport="false"
            multiple="true" 
            update="messages" 
            fileLimit="1000" 
            allowTypes="/(\.|\/)(csv|txt)$/"
            onstart="setUploadFilesCount()" />

    </h:form>

    <h:form prependId="false" style="display:none;">
        <h:inputText id="fileupload-multi-fix-input" value="#{sccReportController.numberOfUploadFiles}">
        <f:ajax event="change" execute="@form"  />
        </h:inputText>
    </h:form>
</ui:define>

并关注我的Java类

/**
  * The Class SccReportController.
*/

@Controller
@ManagedBean
@Scope("view")
public class SccReportController {

final static private String DIRECTORY = "c:\\temp\\";
final static private String DIRECTORY_TEMPORARY = "c:\\temp\\temporary_folder";

private String reportOption;

private int uploadCount = 0;
private int numberOfUploadFiles;

private StreamedContent file;
private ArrayList<File> files = new ArrayList<File> ();


public String getReportOption() {
    return reportOption;
}

public void setReportOption(String reportOption) {
    this.reportOption = reportOption;
}

public int getNumberOfUploadFiles() {
    return numberOfUploadFiles;
}

public void setNumberOfUploadFiles(int numberOfUploadFiles) {
    this.numberOfUploadFiles = numberOfUploadFiles;
}

public StreamedContent getFile() {
    return file;
}

public void handleFileUpload(FileUploadEvent event) throws IOException {

    InputStream input = event.getFile().getInputstream();
    OutputStream output = new FileOutputStream(new File(DIRECTORY_TEMPORARY, event.getFile().getFileName()));

    try {
        IOUtils.copy(input, output);
        } finally {
            IOUtils.closeQuietly(input);
            IOUtils.closeQuietly(output);
            }

    uploadCount++;

    if(uploadCount == numberOfUploadFiles){

         File fFolder = new File(DIRECTORY_TEMPORARY);

         for(File file: fFolder.listFiles()){
             files.add(file);
         }

    }
}

}

当我调试此代码时，我在String reportOption中没有收到任何值。 reportOption返回null。

你能帮我理解我的代码中的问题吗？

感谢。

ATT;

安德烈

Answer 1

尝试添加＆＃34; process = @ this＆＃34;在ajax事件中像这样

<p:ajax event="change" process="@this"
                            update="@this"></p:ajax>

Answer 2

根据Ayhan Arslan的awnser，我把下面的代码放在selectOneMenu中

 <p:ajax event="change" process="@this" update="@this"></p:ajax>

所以，它现在正在工作，我将selectOneMenu代码更改为：

h4>1) Select the Report:</h4>
                <h:selectOneMenu id="reportOption" value="#{sccReportController.reportOption}" required="true" label="Report Option">
                    <f:selectItem itemLabel="Select one" itemValue="" noSelectionOption="true" />
                    <f:selectItem itemLabel="MGW SCC Report" itemValue="MGWSCC" />
                    <f:selectItem itemLabel="MSC SCC Report" itemValue="MSCSCC" />
                    <f:selectItem itemLabel="MSC SCC + VLR Active User + HLR Provisioned Subscribers Report" itemValue="MSCVLR" />

                    <p:ajax event="change" process="@this" update="@this"> // I added this code line according with Ayhan Arslan anwser</p:ajax>
                </h:selectOneMenu>

        <br />
        <br />

我无法使用JSF在selectOneMenu中获得价值。在变量中返回null

2 个答案: