How to handle value change events of select list in custom component?
My HelloUIComp code...How to handle events for "Select"...if i choose option1 from select then one text box is to be displayed in custom component and if i choose another option then some other text box is to be displayed in custom components...
public class HelloUIComp extends UIComponentBase {
public static final String account="custom.account";
public static final String RENDERER_TYPE = null;
HtmlCommandButton button = createButton();
//HtmlSelectOneMenu select=createSelect();
public void processDecodes(FacesContext context) {
Calling the lifecycle method "processDecodes" on the
internal button is absolutely critical to create action events
button.processDecodes(context);
super.processDecodes(context);
private HtmlCommandButton createButton() {
FacesContext context = FacesContext.getCurrentInstance();
HtmlCommandButton newButton = new HtmlCommandButton();
newButton.setId("Add");
newButton.setValue("Add");
newButton.setType("submit");
//newButton.setOnclick("return func_1(this,event);");
MethodBinding binding = context.getApplication().createMethodBinding("#{pc_MyProjectView.go}", null);
newButton.setAction(binding);
newButton.setParent(this);
return newButton;
/* private HtmlSelectOneMenu createSelect()
HtmlSelectOneMenu selectCategory=createSelect();
return selectCategory;
public void encodeBegin(FacesContext context) throws IOException {
String style = (String)getAttributes().get("style");
String startdate = (String)getAttributes().get("startdate");
String enddate = (String)getAttributes().get("enddate");
//String add=(String)getAttributes().get("add");
ResponseWriter writer = context.getResponseWriter();
writer.startElement("table", this);
writer.writeAttribute("border","2","2");
writer.startElement("tbody", this);
writer.startElement("tr", this);
writer.startElement("td", this);
writer.writeText("Account Category", null);
writer.endElement("td");
writer.startElement("td", this);
writer.writeText("Reg-No", null);
writer.endElement("td");
writer.startElement("td", this);
writer.writeText("Account-No", null);
writer.endElement("td");
writer.startElement("td", this);
writer.writeText("", null);
writer.endElement("td");
writer.startElement("td", this);
writer.writeText("Start-Date", null);
writer.endElement("td");
writer.startElement("td", this);
writer.writeText("End-Date", null);
writer.endElement("td");
writer.endElement("tr");
writer.startElement("tr",this);
writer.startElement("td", this);
writer.startElement("select", this);
if (style!=null)
writer.writeAttribute("style", style, null);
writer.writeAttribute("name","category","category");
writer.startElement("option", this);
writer.writeText("Select", null);
writer.endElement("option");
//to access data
Account accountObj;
AccountData accountDataobj;
List listOfAccounts;
int noOfAccounts;
accountDataobj=new AccountData();
listOfAccounts=accountDataobj.getAccounts();
noOfAccounts=listOfAccounts.size();
for(int i=0;i<noOfAccounts;i++)
writer.startElement("option", this);
accountObj=(Account) listOfAccounts.get(i);
writer.writeText(accountObj.getCategory(), null);
writer.endElement("option");
//System.out.println(accountObj.getRegNo());
//System.out.println(accountObj.getAccountNo());
writer.endElement("select");
writer.endElement("td");
writer.startElement("td", this);
writer.startElement("select", this);
if (style!=null)
writer.writeAttribute("style", style, null);
writer.writeAttribute("name","regno","regno");
writer.startElement("option", this);
writer.writeText("Select", null);
writer.endElement("option");
for(int i=0;i<noOfAccounts;i++)
accountObj=(Account) listOfAccounts.get(i);
writer.startElement("option", this);
writer.writeText(""+accountObj.getRegNo(), null);
writer.endElement("option");
writer.endElement("select");
writer.endElement("td");
writer.startElement("td", this);
writer.startElement("select", this);
if (style!=null)
writer.writeAttribute("style", style, null);
writer.writeAttribute("name","accno","accno");
writer.startElement("option", this);
writer.writeText("Select", null);
writer.endElement("option");
for(int i=0;i<noOfAccounts;i++)
accountObj=(Account) listOfAccounts.get(i);
writer.startElement("option", this);
writer.writeText(accountObj.getAccountNo(), null);
writer.endElement("option");
//writer.startElement("option", this);
//writer.writeText("00200155", null);
//writer.endElement("option");
writer.endElement("select");
writer.endElement("td");
writer.startElement("td", this);
button.encodeBegin(context);
button.encodeChildren(context);
button.encodeEnd(context);
writer.endElement("td");
writer.startElement("td", this);
writer.startElement("input", this);
if (style!=null)
writer.writeAttribute("style", style, null);
writer.writeAttribute("type","text","text");
writer.writeAttribute("name","startdate","startdate");
writer.writeAttribute("value",startdate,startdate);
writer.writeAttribute("readonly", "","");
//writer.endElement("input");
writer.endElement("td");
writer.startElement("td", this);
writer.startElement("input", this);
if (style!=null)
writer.writeAttribute("style", style, null);
writer.writeAttribute("type","text","text");
writer.writeAttribute("name","enddate","enddate");
writer.writeAttribute("value",enddate,enddate);
writer.writeAttribute("readonly", "","");
writer.endElement("td");
writer.endElement("tr");
writer.endElement("tbody");
writer.endElement("table");
public String getFamily() {
return "HelloFamily";
}
NewEclipseCoder wrote:
How to handle events for "Select"...if i choose option1 from select then one text box is to be displayed in custom component and if i choose another option then some other text box is to be displayed in custom components...Two ways:
1) submit the form to the server and render the desired textbox depending on the option.
or
2) render all textboxes and use Javascript/DOM to display/hide them depending on the option.
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at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
at com.ibm.faces.webapp.FacesGenericPortlet.execute(FacesGenericPortlet.java:637)
at com.ibm.faces.webapp.FacesGenericPortlet.processAction(FacesGenericPortlet.java:142)
at com.sp.portlet.GoldenAccountPortlet.processAction(GoldenAccountPortlet.java:143)
at com.ibm.wps.pe.pc.std.cmpf.impl.PortletFilterChainImpl.processAction(PortletFilterChainImpl.java:104)
at com.ibm.wps.propertybroker.standard.filter.PropertyBrokerActionFilter.processAction(PropertyBrokerActionFilter.java:260)
at com.ibm.wps.pe.pc.std.cmpf.impl.PortletFilterChainImpl.processAction(PortletFilterChainImpl.java:95)
at com.ibm.wps.pe.pc.std.invoker.impl.PortletServlet.dispatch(PortletServlet.java:148)
at com.ibm.wps.pe.pc.std.invoker.impl.PortletServlet.doPost(PortletServlet.java:76)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at com.ibm.wps.pe.pc.std.cache.CacheablePortlet.service(CacheablePortlet.java:257)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:1095)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java(Compiled Code))
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.include(WebAppRequestDispatcher.java:254)
at com.ibm.wps.pe.pc.std.invoker.impl.PortletInvokerImpl.invoke(PortletInvokerImpl.java:204)
at com.ibm.wps.pe.pc.std.invoker.impl.PortletInvokerImpl.invoke(PortletInvokerImpl.java:168)
at com.ibm.wps.pe.pc.std.invoker.impl.PortletInvokerImpl.action(PortletInvokerImpl.java:82)
at com.ibm.wps.pe.pc.std.event.ActionEvent.execute(ActionEvent.java:111)
at com.ibm.wps.pe.pc.std.event.EventQueueManager.processEventLoop(EventQueueManager.java:86)
at com.ibm.wps.pe.pc.std.PortletContainerImpl.performEvents(PortletContainerImpl.java:168)
at com.ibm.wps.pe.pc.PortletContainerImpl.performEvents(PortletContainerImpl.java:229)
at com.ibm.wps.engine.phases.WPActionPhase.processPortlets(WPActionPhase.java:947)
at com.ibm.wps.engine.phases.WPActionPhase.execute(WPActionPhase.java:489)
at com.ibm.wps.state.phases.AbstractActionPhase.next(AbstractActionPhase.java:130)
at com.ibm.wps.engine.Servlet.callPortal(Servlet.java:710)
at com.ibm.wps.engine.Servlet.doGet(Servlet.java:562)
at com.ibm.wps.engine.Servlet.doPost(Servlet.java:736)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:76)
at com.ibm.wps.state.filter.StateCleanup.doFilter(StateCleanup.java:86)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:132)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:71)
at com.ibm.wps.mappingurl.impl.URLAnalyzer.doFilter(URLAnalyzer.java:258)
at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:132)
at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:71)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:1086)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java(Compiled Code))
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:201)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:125)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:286)
at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:182)
at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:652)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:448)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java(Compiled Code))
Caused by: com.sp.exceptions.ServicePackagesException: My custome error message
at pagecode.fragments.GSolus.getTariffsByRef(GSolus.java:297)
at pagecode.fragments.GSolus.handleServicePackageComboValueChange(GSolus.java:214)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java(Compiled Code))
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java(Compiled Code))
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java(Compiled Code))
at java.lang.reflect.Method.invoke(Method.java(Compiled Code))
at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:126)
... 68 more -
I need to be able to use the value change event to handle sorting and control the properties of a multicolumn listbox. I have a slow loop that runs every 10 seconds and acquires new data if it's available. New data is appended directly to the list box. The event structure handles two events. One to change colors of the text when new data is added and another to sort the contents when a user clicks on the column header. The first event seems to work just fine. It only runs when new data is added. The second event is the problem. It runs every time the loop runs and ties up the user interface so that it does not respond.
What am I doing wrong??
By the way, it seems that whatever I am doing wrong crashes LabVIEW while I am
editing the vi. Probably during a partial compile. LabVIEW crashed twice while I was creating this test vi and I don't normally have trouble with LabVIEW crashing. It has crashed in both the transact.cpp and panel.cpp.
Thanks for any help or guidance you can offer.
Attachments:
Event_Handling_Test.vi 242 KBI have made a few quick modifications, see attached.
-- The lower loop should probably be a plain loop, since the timing is done by the event structure.
-- You cannot use a shift register in the upper loop if you want the acquired list to remain sorted.
Sorry, I am on vacation in the middle of nowhere and only spend a few minutes on this. There are many improvements possible.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Event_Handling_TestMOD.vi 200 KB -
Drop Down Lists and Value Change Events
I have 4 drop down lists each with a set of values from the database.
Based on the value of the first list(ValueChangeEvent only for list1) , I fetch data from the database and set the 'selected value' in the other lists.
I have a Submit button which takes values from these 4 lists and puts it in the database.
Problem:
I change list 2 through list 4 and hit a Submit button which inserts all the values in the database.
However,on Clicking the Submit button I never get the new selected values, it always refers to the previously fetched values.
I tried to recreate this case in a Sandbox without a database , Here is the code:
Page1.jsp
<h:selectOneMenu id="list1" value="#{SessionBean1.selectedList1}" valueChangeListener="#{SessionBean1.list1ValueChangeListener}" onchange="this.form.submit();" >
<f:selectItems id="dropdown1SelectItems" value="#{SessionBean1.list1}"/>
</h:selectOneMenu>
<h:selectOneMenu id="list2" value="#{SessionBean1.selectedList2}" >
<f:selectItems id="dropdown2SelectItems" value="#{SessionBean1.list2}"/>
</h:selectOneMenu>
<h:commandButton id="add" actionListener="#{SessionBean1.addActionListener}" value="Add"/>
<h:inputText id="result" value="#{SessionBean1.result}" />SessionBean1
public SessionBean1() {
list1.add(new SelectItem("0","0"));
list1.add(new SelectItem("1","1"));
list1.add(new SelectItem("2","2"));
list1.add(new SelectItem("3","3"));
list2.add(new SelectItem("a","a"));
list2.add(new SelectItem("b","b"));
list2.add(new SelectItem("c","c"));
list2.add(new SelectItem("d","d"));
map.put("0", "a");
map.put("1", "b");
map.put("2", "c");
map.put("3", "d");
private void fetch_data(String value){
selectedList2=map.get(value);
public void list1ValueChangeListener(ValueChangeEvent vce){
fetch_data(vce.getNewValue().toString());
public void addActionListener(ActionEvent event){
result=selectedList2;
}I tried debugging and found that after the Value Change Event is fired only selectedList1 gets a new value during Update Model Values Phase and selectedList2 still has the old value.
With this sand box project I cannot even get the second list to show the corresponding value.
Any insight on this would be helpfulThank You Balus C,
I just realized the reason why this is not working, I found the reason in your article Populating Child Menu's article, I am just
putting it as a reference here.
One concern is that the skipping of the UPDATE_MODEL_VALUES will also cause that the new values of the menu's which have immediate="true" set won't be set in the backing bean. This can partly be fixed by getting the new value from the ValueChangeEvent inside the valueChangeListener method and assign it to the appropriate property. But this won't work for other menu's of which the valueChangeListener isn't been invoked. This would cause problems if you select a child menu value and then select the parent menu back to null and then reselect it to same value again, the child menu which will show up again would remain the same selection instead of null while its child will not be rendered! To solve this we need to bind the menu's to the backing bean so that we can use UIInput#setValue() and UIInput#getValue() to set and get the actual values.+ The JSF lifecycle will set and get them in the RESTORE_VIEW and RENDER_RESPONSE phases respectively.+
I am not sure I understand whether or not it is a limitation but the reason above is valid and I rolled back to binding my menus and getting to work with that.
Is Binding UI components a wise idea because most of the attributes can be programmed using properties in Backing Beans unless you have to build new components?
Thanks Again -
Value change using DataSocket can't create value change event on remote computer?
I am trying to create an event on the remote computer:
Local computer:
Change a value in remote computer by DataSocket.
Remote Computer:
create a event: when the value changes.
I can see the value change on the remote computer; however, the value change doesn't cause the "value change event".
Anyone tried this before? Thanks.
------- LabVIEW 2009, So Easy, Even a Therapist Can Do It -------Hi,
Event Structure monitors a specified event based on user interaction on the front-panel objects. However, it does not monitor event generated programmatically like a change in the DataSocket data value. In order to generate a value change event with the DataSocket, you will need to use the "value (signaling)" property node for the DataSocket data or control. This property node sets the value of the control and also generates a Value Change event.
To create the property node, simply right click the control and select "Create>>Property Node>> Value (Signaling)". You can then wire the output from the DataSocket read to this property.
You can also checkout this knowledgebase entry for additional information.
Tunde -
There are two basic events, action and value-changed events.
How is the server informed of a value-changed event? Does this include javaScript? If not, how is this handeled?
Thx,
Sven HaigesJSF is a server-side technology, so while JavaScript can be generated for some client-side behavior, the bulk of the processing (and the only processing that is guaranteed to work for all client types) happens on the server.
Value-changed events are generated on the server when the form is submitted, by comparing the component's old value to the new value recieved with the request. In other words, these events are not triggerd by simply changing the value in the browser; the form must be subitted before the event is triggered (which, of course, can be initiated by JavaScript code immediately when the value is changed in some client-types).
I hope this helps. -
Newbie: UITextField's "value changed" event won't fire
I'm trying to get a UITextField's "value changed" event to trigger whenever it's value is changed with the keyboard or if some other control changes it via setting the myTextField.text property. For some reason, this event will not fire and call the event handler.
I tried connecting the other events such as "Editing Did Begin" to the event handler, and it works. But "Value Changed" event never fires. Is it a supported event or am I missing somethingI had the same problem, this works:
[myTextField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged]; -
Double value change event if cursor is set busy (LV2009)
Hello everybody,
I just migrated from LV 8.0 to LV 2009 (on linux) and now got problems with a value change event. I want to send a command if a button is pressed and send another one if the button is released. After sending the command I need to wait for an acknowledge from the receiver and to avoid user interaction in between I lock the cursor with "set busy" VI until the acknowledge is received. To see, when the button is pressed or released, I use a value change event. Inside the event structure the cursor is set busy.
This worked reliable in LV 8.0 but not any more in LV 2009. The button's mechanical action is set to "switch until released" and if I press the button and keep it pressed it is reset to false automatically. The value change event is fired twice instead of only once (see attached vi) and "new value" is one time true and one time false. This doesn't happen if the mechanical action is set to "switch when pressed".
Does anybody have an explanation or a workaround for this behaviour? Am I doing something wrong or is this a bug in LV? For now I'll just keep the cursor unlocked.
Thanks for your help.
Attachments:
setMouseBusy_01.vi 11 KBHi ckis,
attached you'll find your modified example, it should do the trick now.
Regards,
Bernd
Attachments:
setMouseBusy_01.vi 9 KB
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