What can cause an ultra-slow screen refresh in Windows XP?

Question

When "selectOneMenu" is placed in the "dataTable" column header it: 1) triggers row sorting everytime it is opened or after the button next to it is clicked and "selectOneMenu" is opened (it shouldn't be like that); 2) fails to assign value to the backing bean. How can "selectOneMenu" be attached to the column header so that these problems wouldn't occur?

*.xhtml code with dataTable which causes 1) and 2) problems:

<h:form id="someForm0">
    <p:dataTable id="sdt" var="variable" value="#{otherBean.tableModel}" rows="10">
            <p:column sortBy="#{variable.name}" filterBy="#{variable.name}"  filterMatchMode="contains" >
                <f:facet name="header">
                    <h:outputText value="Name"/>
                    <h:panelGrid columns="2" cellpadding="1">
                            <p:selectOneMenu id="abc" value="#{userBean.someChars}">
                            <f:selectItem itemLabel="" itemValue="select" />
                            <f:selectItem itemLabel="AAA" itemValue="AAA" />
                            <f:selectItem itemLabel="BBB" itemValue="BBB" />
                            <f:selectItem itemLabel="CCC" itemValue="CCC" />
                        </p:selectOneMenu>
                        <h:commandButton id="btn" value="Submit" type="submit" action="#{userBean.submitChars}"/>
                        </h:panelGrid>
                </f:facet>  
                <h:outputText value="#{variable.name}"/>  
            </p:column>  
    </p:dataTable>
</h:form>

Backing bean code:

@ManagedBean
public class UserBean
{
    private String someChars;

    public String getSomeChars()
    {
        return someChars;
    }

    public void setSomeChars(String someChars)
    {
        this.someChars = someChars;
    }

    public String submitChars()
    {
       if(getSomeChars() != null)
       {
           System.out.println("Selected chars are: " + getSomeChars());
       }
       else
       {
            System.out.println("Selected chars are equal to null!");
       }
       return null;
    }
}

Here is fragment of the previously mentioned *.xhtml code, and selectOneMenu works just great when placed into the basic form:

<h:form id="someForm">
    <p:selectOneMenu id="abc" value="#{userBean.someChars}">
        <f:selectItem itemLabel="" itemValue="select" />
        <f:selectItem itemLabel="AAA" itemValue="AAA" />
        <f:selectItem itemLabel="BBB" itemValue="BBB" />
        <f:selectItem itemLabel="CCC" itemValue="CCC" />
    </p:selectOneMenu>
    <h:commandButton id="btn" value="Submit" type="submit" action="#{userBean.submitChars}"/>
</h:form>

I think the last resort would be adding elements from the dataTable column header to the dataTable header:

<h:form id="someForm1">
    <p:dataTable id="sdt" var="variable" value="#{otherBean.tableModel}" rows="10">
            <f:facet name="header">
                <h:panelGrid columns="2" cellpadding="1">
                    <p:selectOneMenu id="abc" value="#{userBean.someChars}">
                        <f:selectItem itemLabel="" itemValue="select" />
                        <f:selectItem itemLabel="AAA" itemValue="AAA" />
                        <f:selectItem itemLabel="BBB" itemValue="BBB" />
                        <f:selectItem itemLabel="CCC" itemValue="CCC" />
                    </p:selectOneMenu>
                    <h:commandButton id="btn" value="Submit" type="submit" action="#{userBean.submitChars}"/>
                </h:panelGrid>
            </f:facet>
            <p:column sortBy="#{variable.name}" filterBy="#{variable.name}"  filterMatchMode="contains" >
                <f:facet name="header">
                    <h:outputText value="Name"/>
                </f:facet>  
                <h:outputText value="#{variable.name}"/>  
            </p:column>  
    </p:dataTable>
</h:form>

Solution

I've had this. I believe the programs you are using require more ram. Information has been moved out of ram and has to be accessed from the hard drive. So all available ram is being used and so the window can only get a small amount of info at a time.

I'm not an expert so someone may have a more accurate answer.

Regards,

Comments

[Dan Tao]

This makes sense to me. AND I am very happy to hear it as I just upgraded my 512 Mb to 2 Gb! So far, it definitely seems much better.

[Benas]

CycDemo, to be precise ajax event should be written something like this: <p:ajax event="change" listener="#{userBean.onSelectOneMenuChange}" onchange="submit()"/> and code in bean: public void onSelectOneMenuChange(AjaxBehaviorEvent event) { System.out.println("Trying to change something"); } Unfortunatelly this doesn't solve neither 1) nor 2) problem.