我们要求允许用户配置所有数据表中列的顺序,包括在其上具有操作按钮的列,此处为p:commandButton

因此,我们对所有必须手动实例化的列都使用了绑定。对于仅显示某些字符串,布尔值,日期和数字的所有列,都可以正常工作,但是,当将p:commandButton添加到具有一个或多个<f:setPropertyActionListener>的列时,就会出现问题。

    ELContext elContext = FacesContext.getCurrentInstance().getELContext();
    ExpressionFactory factory = FacesContext.getCurrentInstance().getApplication().getExpressionFactory();

    CommandButton button = new CommandButton();
    button.setIcon( "ui-icon ui-icon-pencil" );
    button.setProcess( "@this" );
    button.setUpdate( ":compliance-case-dialog :compliance-case-form:data" );
    button.setOncomplete( "complianceCaseDialog.show();" );

    ValueExpression targetExpression = factory.createValueExpression( elContext, "#{complianceCaseManager.selectedComplianceCaseWithRefresh}", ComplianceCase.class );
    ValueExpression valueExpression = factory.createValueExpression( elContext, "#{coca}", ComplianceCase.class );

    button.addActionListener( new SetPropertyActionListenerImpl( targetExpression, valueExpression ) );

    column.getChildren().add( button ); // add to Column instance


此按钮“正确”显示一个<p:dialog>,但在显示该对话框之前,应使用数据表的当前实体(由ComplianceCaseManager定义)调用setSelectedComplianceCaseWithRefresh( ComplianceCase selectedComplianceCase )类的var="coca"方法。

<p:dataTable id="data"
             widgetVar="resultTable"
             value="#{complianceCaseManager.complianceCases}"
             var="coca"
             ...>
</p:dataTable>


调试显示从未调用setSelectedComplianceCaseWithRefresh( ComplianceCase selectedComplianceCase )方法。

问:

怎么了?您如何解决这个问题?

PS:配置为PrimeFaces 3.4.2,Mojarra 2.1.22,GlassFish 3.1.2.2,Java 7



更新1:

这是我想翻译为程序化的p:commandButton:

<p:commandButton icon="ui-icon ui-icon-pencil"
                 title="#{msg['complianceCaseManager.data.edit.button.hint']}"
                 process="@this"
                 update=":compliance-case-dialog :compliance-case-form:data"
                 oncomplete="complianceCaseDialog.show();">
    <p:resetInput target=":unlocked-form" />
    <f:setPropertyActionListener target="#{complianceCaseManager.selectedComplianceCaseWithRefresh}" value="#{coca}" />
    <f:setPropertyActionListener target="#{complianceCaseManager.mode}" value="EDIT" />
</p:commandButton>


线

    <f:setPropertyActionListener target="#{complianceCaseManager.selectedComplianceCaseWithRefresh}" value="#{coca}" />


是我必须去上班的那个。

kolossus创建MethodExpressionActionListener的解决方案不适用于我的代码:

    String targetExpressionString = "#{complianceCaseManager.selectedComplianceCaseWithRefresh}";
    String valueExpressionString = "#{coca}";

    MethodExpression targetMethodExpression = factory.createMethodExpression( elContext, targetExpressionString, null, new Class<?>[]{ ComplianceCase.class } );
    MethodExpression valueMethodExpression = factory.createMethodExpression( elContext, valueExpressionString, ComplianceCase.class, new Class<?>[0] );

    button.addActionListener( new MethodExpressionActionListener( targetMethodExpression, valueMethodExpression ) );


进行AFAIK的目的是在目标上调用设置器,在值上调用设置器,因此我假设ValueExpression就足够了。



更新2:

尝试通过EL 2.2方法调用设置当前实体也不起作用。

码:

    String methodExpressionString = "#" + "{complianceCaseManager.selectedComplianceCaseWithRefresh(coca)}";
    MethodExpression methodExpression = factory.createMethodExpression( elContext, methodExpressionString, null, new Class<?>[]{ ComplianceCase.class } );

    button.addActionListener( new MethodExpressionActionListener( methodExpression ) );


什么都没叫。



更新3:

这是正确的<:setPropertyActionListener>代码:

    // traditional <f:setPropertyActionListener target="#{complianceCaseManager.selectedComplianceCaseWithRefresh}" value="#{coca}" />
    ValueExpression targetExpression = factory.createValueExpression( elContext, "#{complianceCaseManager.selectedComplianceCaseWithRefresh}", ComplianceCase.class );
    ValueExpression valueExpression = factory.createValueExpression( elContext, "#{coca}", ComplianceCase.class );

    button.addActionListener( new SetPropertyActionListenerImpl( targetExpression, valueExpression ) );


非常感谢kolossus。实例化PrimeFaces setId()时,请记住要调用CommandButton

最佳答案

应该将actionListener创建为MethodExpression而不是ValueExpression


我假设factory instanceOf ExpressionFactory。使用createMethodExpression factory

MethodExpression targetExpression = factory.createMethodExpression( elContext, "#{complianceCaseManager.selectedComplianceCaseWithRefresh(coca)}",null,new Class[]{ComplianceCase.class} );

将侦听器添加到组件:

button.addActionListener( new MethodExpressionActionListener(targetExpression));

与当前问题不完全相关,您还省略了组件的id属性。为了安全起见,请添加

button.setId("theButton");


编辑:动态创建命令组件时,您绝对必须设置id属性

关于jsf - JSF/PrimeFaces:<p:commandButton>上的编程<f:setPropertyActionListener>不触发,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/17343336/

10-10 08:09