Question

我正在尝试在现有的大型SEAM项目中向用户添加信息消息。我已将<h:messages/>添加到.xhtml页面，这些是我在名为AbstractChartController的类的代码中的尝试，但是当操作后页面刷新时，会显示非FacesMessages，任何人都知道我接下来可以尝试什么？

if (axis.getAxisType() == AxisType.LOGARITHMIC  && axis.getLowestValue() <= 0d){
    //Non of this code works:
    //Attempt 1
    FacesMessages facesMessages = FacesMessages.instance();
    facesMessages.add(FacesMessage.SEVERITY_INFO, "Note: Data contains values below or equal to zero so cannot be plotted on a logarithmic axis.");
    //Attempt 2
    FacesContext context = FacesContext.getCurrentInstance();
    FacesMessage message = new FacesMessage("Test2");
    context.addMessage(null, message);
    //Attempt 3
    org.jboss.seam.faces.FacesContext myContext = (org.jboss.seam.faces.FacesContext) Component.getInstance("FacesContext");
    if (myContext != null) { //Why is this null in debug?
        myContext.getContext().addMessage("Test3", message);
    }
    //Attempt 4:
    //StatusMessages.instance()
    //.add(StatusMessage.Severity.INFO, "Test4");
    // (Compile time error above that it can't find StatusMessages class to import)
    System.out.println("FacesMessage added");
    ...

编辑：“添加了Faces消息”正在我的eclipse控制台中显示，因此代码正在运行

我认为这个类由于某种原因无法访问FacesContext？我是在正确的轨道上吗？

Answer 1

StatusMessages statusMessages =  Component.getInstance("statusMessages");
statusMessages.add(Severity.ERROR,"Note: Data contains values below or equal to zero so cannot be plotted on a logarithmic axis.");

SEAM FacesMessage没有显示

1 个答案: