Button event handler problem

Hello,
I need to add an Event handler to a button on my JSP page. The page refreshes very three seconds for other use.
First, I added the following segment to the page.
<head>
<title>Event handler test</title>
<script type="text/javascript">

</script>
<meta http-equiv="refresh" content="3">
</head>
<input type = "button" name = "add" value = "Add" onclick="funAdd()" />
Every time I clicked the Add button, the alert message appeared. It showed the expected result.
Then, I replaced alert("Your name is already in the list."); with
<%
JOptionPane.showMessageDialog(null, "Your name is already in the list.", "Error message", JOptionPane.ERROR_MESSAGE);
%>
in funAdd().
But, the error message showed automatically every three seconds when the page refreshed without clicking the Add button.
Does any one know the reason, and how to solve the problem?
Thanks in advance.
Dan

You said it yourself, you refresh your page each 3 seconds so each 3 seconds you do a request to your server where you show a messagedialog.

Similar Messages

Up Button Event Handling Problem

I am currently making a platform game. For the character to
jump, I use the code:
on(keyPress "<Up>"){
, but when a person holds the up button, if the character
goes onto another platform, it jumps again. Is there a way to have
an event fire only once per press?
THNX

you can disable that button after it detects the up key and
re-enable it when you detect an onKeyUp event.

'Call' in PL/SQL button event handler

I have created a form with only one 'Custom' button on it.
In the PL/SQL button event handler, in 'Custom' event item, I
inserted some PL/SQL code and, at the end, a call like the
following:
my_url:= 'PORTAL30.wwv_component_control.run_as_portlet?'
|| 'p_module_id=' || '2836550185';
call(my_url,return_url);
I have a compilation error:
"PLS-00201: identifier 'CALL' must be declared"
I also tried to put this code in 'On successful submission of a
form'. I have no compilation error but it doesn't work.
Anybody knows hw to solve this problem?
Thanks.

Hello Antonnella,
I have a good tip for you:
write the next scirp in the 'On successful submission of a
form'field in the form where you want to call the component:
declare
l_url varchar2(2000);
begin
l_url := 'the url of the component you want to call' ;
PORTAL30.wwa_app_module.set_target(l_url,'CALL');
end;
you can get the url from:
develop -> call interface:show -> Example of Call from URL .
Success,
Haseeb

How to show a message in a form 'PL/SQL Button Event Handler'

We need validate the sal of an employee, and if it is bigger the value musts
not be inserted.
We trying a code like the one shown in the note 134312.1 'HOW TO PASS A
PARAMETER FROM A PORTAL FORM TO A STORED PROCEDURE' and it works in the insert event of the insert button (using 'PL/SQL Button Event Handler') and it works, but we need to show a message that says the data wasn't inserted. How can we do this?
The code we used is:
declare
v_deptno scott.emp.deptno%type;
v_empno scott.emp.empno%type;
v_sal scott.emp.sal%type;
mySal scott.emp.sal%type;
v_string varchar2(256);
blk varchar2(10):='DEFAULT';
begin
select sal into mySal from scott.emp where empno=7369;
v_deptno:=p_session.get_value_as_number(p_block_name=>blk,
p_attribute_name=>'A_DEPTNO');
v_empno:=p_session.get_value_as_number(p_block_name=>blk,
p_attribute_name=>'A_EMPNO');
v_sal:=p_session.get_value_as_number(p_block_name=>blk,
p_attribute_name=>'A_SAL');
v_string:='You just inserted empno: '||to_char(v_empno) ||'to deptno ->
'||to_char(v_deptno);
if mySal < v_sal then
doInsert;
else
-- We want to display a message here, when mySal > v_sal
end if;
end;
----------------------------------

I did something similar but wasn't using a stored procedure. Couldn't you set a flag variable once you know you're not doing the insert and in the "before displaying the form" section put an IF to check if your flag was set, and if so do an HTP.Print('You are overpaid buddy!');
Then just reset your flag.

How to get a form field valud in delete PL/SQL Button Event Handler

Hi Friend,
I have a form. when user clicks delete button. we want to remove system dodelete function
and add a delete script
Under delete-top category,
how can I get value of form EVENT_NUMBER field in form at delete PL/SQL Button Event Handler?
DELETE FROM PTEAPP.PTE_EVENTS WHERE eventnumber = EVENT_number
But when I try to save this form and get message as
1721/15 PLS-00201: identifier 'EVENT_NUMBER' must be declared
Thanks for any help!
newuser

I did something similar but wasn't using a stored procedure. Couldn't you set a flag variable once you know you're not doing the insert and in the "before displaying the form" section put an IF to check if your flag was set, and if so do an HTP.Print('You are overpaid buddy!');
Then just reset your flag.

Custom Button Event Handler

I'm working on a form that inserts data into my database. The normal Insert PL/SQL just does "doInsert". I want to add in the PL/SQL Button Event Handler a condition statement as follows:
IF :new.name_id != null THEN
doInsert;
ELSE
"do something else"
END IF;
"name_id" is one of the form items. I want to check the value in name_id before I insert it into the database. What is the correct verbage in order for this condition to work -- :new.name_id does not work.
Thanks
Susan

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Susan Miller ([email protected]):
I'm working on a form that inserts data into my database. The normal Insert PL/SQL just does "doInsert". I want to add in the PL/SQL Button Event Handler a condition statement as follows:
IF :new.name_id != null THEN
doInsert;
ELSE
"do something else"
END IF;
"name_id" is one of the form items. I want to check the value in name_id before I insert it into the database. What is the correct verbage in order for this condition to work -- :new.name_id does not work.
Thanks
Susan<HR></BLOCKQUOTE>
null

Htp.p doesn't work from the custom button event handler ...

Hi,
I am trying to pop up an alert from the custom button event handler. I created a button and put the following code.
htp.p('<script language='JavaScript1.3">
alert ("Test Message");
</script>;
But alter doesn't show up after clicking the button.
Thanks

OK i've attached them and copy/pasted the relevent parts. The parent window is the SFLB file.
-----------------------------------------here's the code in the parent window
private function editServerPool():
void
serverPoolPUW = PopUpManager.createPopUp(
this,popups.ServerPoolPopup,true);PopUpManager.centerPopUp(serverPoolPUW
as IFlexDisplayObject);
if (newServerPool.SecondarySPAlgorithm != null){
serverPoolPUW.enableSSCheckBox.selected =true;serverPoolPUW.DisplaySecondaryServerPool();
serverPoolPUW.bigResize.play();// serverPoolPUW.height = 602; //yes...i know i need to move thisserverPoolPUW.switchoverPolicyCB.selectedItem = newServerPool.SwitchOverPolicy;
serverPoolPUW.switchoverThresholdTI.text = newServerPool.SwitchOverThreshold;
----------------------here's the code in teh popup window (popups.ServerPoolPopup.mxml)
<mx:Resize id = "bigResize" heightFrom="506" heightTo="602" target="{this}" />
<mx:Resize id = "littleResize" heightFrom="602" heightTo="506" target="{this}"/>
public function DisplaySecondaryServerPool():void{
//make the screen large if the secondary server checkbox is selected; otherwise small.
if (enableSSCheckBox.selected){
//display secondary server pool tab, expand the screen
//note that we cannot attach a data provider to the data grid until the grid creation is
//completed. This is done in an event handler.secondaryPanel.enabled =
true; switchoverPolicyCB.visible =
true;switchoverThresholdTI.visible =
true;thresholdFI.visible =
true;policyFI.visible =
true;bigResize.play();
else
<mx:CheckBox label="Enable a Secondary Server Pool" width="264" fontWeight="bold" click="DisplaySecondaryServerPool()" id="
enableSSCheckBox" fontSize="12" x="83" y="40"/>

GUI event handling problems appear in 1.4.1 vs. 1.3.1?

Hi,
Has anyone else experienced strange event handling problems when migrating from 1.3.1 to 1.4.1? My GUI applications that make use of Swing's AbstractTableModel suddenly don't track mouse and selection events quickly anymore. Formerly zippy tables are now very unresponsive to user interactions.
I've run the code through JProbe under both 1.3 and 1.4 and see no differences in the profiles, yet the 1.4.1 version is virtually unusable. I had hoped that JProbe would show me that some low-level event-handling related or drawing method was getting wailed on in 1.4, but that was not the case.
My only guess is that the existing installation of 1.3.1 is interfering with the 1.4.1 installation is some way. Any thoughts on that before I trash the 1.3.1 installation (which I'm slightly reluctant to do)?
My platform is Windows XP Pro on a 2GHz P4 with 1GB RAM.
Here's my test case:
import javax.swing.table.AbstractTableModel;
import javax.swing.*;
import java.awt.*;
public class VerySimpleTableModel extends AbstractTableModel
private int d_rows = 0;
private int d_cols = 0;
private String[][] d_data = null;
public VerySimpleTableModel(int rows,int cols)
System.err.println("Creating table of size [" + rows + "," + cols +
d_rows = rows;
d_cols = cols;
d_data = new String[d_rows][d_cols];
int r = 0;
while (r < d_rows){
int c = 0;
while (c < d_cols){
d_data[r][c] = new String("[" + r + "," + c + "]");
c++;
r++;
System.err.println("Done.");
public int getRowCount()
return d_rows;
public int getColumnCount()
return d_cols;
public Object getValueAt(int rowIndex, int columnIndex)
return d_data[rowIndex][columnIndex];
public static void main(String[] args)
System.err.println( "1.4..." );
JFrame window = new JFrame();
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
Dimension size = new Dimension(500,500);
panel.setMinimumSize(size);
panel.setMaximumSize(size);
JTable table = new JTable(new VerySimpleTableModel(40,5));
panel.add(table);
window.getContentPane().add(panel);
window.setSize(new Dimension(600,800));
window.validate();
window.setVisible(true);
Thanks in advance!!
- Dean

Hi,
I've fixed the problem by upgrading to 1.4.1_02. I was on 1.4.1_01.
I did further narrow down the symptoms more. It seemed the further the distance from the previous mouse click, the longer it would take for the table row to highlight. So, clicking on row 1, then 2, was much faster than clicking on row 1, then row 40.
If no one else has seen this problem -- good! I wouldn't wish the tremendous waste of time I've had on anyone!
- Dean

Execute procedure in pl/sql button event handler

i have a demo application which consists of text boxes
eg : when i enter department no in first text box and click proc
it should display dname and loc in the below text boxes.
my proc is working fine in sql*plus but its showing errors in pl/sql button event handler.
any ideas
my proc is create or replace procedure proc1 (no number)
as
DNAME1 dept.dname%type;
LOC1 dept.loc%type;
begin
select DNAME,LOC into DNAME1,LOC1 from scott.dept where deptno = no;
DBMS_OUTPUT.PUT_LINE (DNAME1);
DBMS_OUTPUT.PUT_LINE (LOC1);
Exception When No_Data_Found then
dbms_output.put_line('Entred name is not found');
When Others then
Null;
End;
/

Hi,
you have to use
htp.p('<SCRIPT LANGUAGE="Javascript1.1">
document.all("FORMNAME.DEFAULT.ATTRIBUTENAME.01").value="'||DNAME1||'";
document.all("FORMNAME.DEFAULT.ATTRIBUTENAME.01").value="'||LOC1||'";
</SCRIPT>
instead of
DBMS_OUTPUT.PUT_LINE (DNAME1);
DBMS_OUTPUT.PUT_LINE (LOC1);
where formname is your form name and attribute name is the field name on the page.

Labview slider event handling problems - revisited

This topic asked a question that was very close to a problem I am having:
Labview slider event handling problems
That is, how do I, using an event structure and/or other means, only read out the value of a slider control after the value change is finalized?
The extra constraint I'd like to place on this, which I believe will invalidate the answer given in the thread above, is that my slider control also has a digital display which can also be used to change the value without ever using the mouse. I cannot look for a value change followed by a mouse-up event if the mouse was not used to change the value.
Any ideas how this might be accomplished? FWIW, I am using LabVIEW 7.0

Each and every incremental value-change event generated by the movement of the slider is still detected and queued up for use by the event structure and the event structure loop wades through them all before it's done.
I have come up the attached "fix" (LV v7.0) for this problem. While it is not as clean a solution as I had hoped it would be, it's the best I can manage given what LabVIEW offers me to work with and it does work in the situation where I need to use it.
Now, within the Finalize Slider Events subVI, I'm keeping track of the most-recent values seen by the subVI, checking to see if they have changed, and reporting out that fact. That gives me a Changed/Not-Changed bit within the event case that I can use to control what code then gets executed. If the event case is just playing catch-up to the real value of the control, I can now see that fact and ignore it.
In this version I've also dumped the variant output and limited the VI to using DBL values. I decided it added complication to something that was too complicated already and I wanted the output terminals for other purposes anyway (reporting of the correct "OldVal" of the control).Message Edited by Warren Massey on 04-28-2005 03:56 AM
Attachments:
slider_events[5].llb ‏77 KB

How to add a custom PL/SQL code for a button event handler

Hi All,
I am a toddler in using Oracle Portal. So please forgive me for my ignorance.
Q : How do I add a custom PL/SQL code for a button event handler?
Basically, I would like to write MY PL/SQL function and call it. I could see that we can write "CUSTOM" code as "PL/SQL button event handler" in the form design window. But the question is that it expects only a "call" to procedure. But where do I define the procedure then? If I insert the procedure from the backend, it gets flushed the next time I compile my form.
Hope I am able to explain my point.
Thanks in advance,
Abbas.

Hi All,
I am a toddler in using Oracle Portal. So please forgive me for my ignorance.
Q : How do I add a custom PL/SQL code for a button event handler?
Basically, I would like to write MY PL/SQL function and call it. I could see that we can write "CUSTOM" code as "PL/SQL button event handler" in the form design window. But the question is that it expects only a "call" to procedure. But where do I define the procedure then? If I insert the procedure from the backend, it gets flushed the next time I compile my form.
Hope I am able to explain my point.
Thanks in advance,
Abbas.

Delicate ProgressMonitor/ event handling problem

Hi,
I have a delicate ProgressMonitor / event handling problem.
There exists some solution on similiar problems here in the forums, but no solution to my special problem, hope anybody can help me out.
I have a rather big project, an applet, that I've written a separate JarLoader class that will load specific jar's if the ClassLoader encounter a unloaded class, all ok so far.
But, during loading, I would like to display a ProgressBar. And here is the problem. If my custom ClassLoader intercepts a findClass -request that needs to load the class from a jar from a normal thread, this is no problem, but if the ClassLoader intercepts a findClass that needs loading a jar when inside the EventQueue -thread, this is becomming tricky!
The catch is that an event posted on the EventQueue finally needs a class that needs to be loaded, but I cannot dispatch a thread to do this and end that particular event before the class itself is loaded.
So how do I hold the current EventQueue -event needing a jar -load, Pop up a ProgressBar, then process events in the EventQueue to display the ProgressBar and update repaints in it? then return from the event that now have loaded needed class-files.
I've tried a tip described earlier in the forums by trying to handle events with this code when loading the Jar:
    /** process any waiting events - use during long operations
     * to update UI */
    static public void doEvents() {
        // need to derive from EventQueue otherwise
        // don't have access to protected method dispatchEvent()
        class EvtQueue extends java.awt.EventQueue {
            public void doEvents() {
                Toolkit toolKit = Toolkit.getDefaultToolkit();
                EventQueue evtQueue = toolKit.getSystemEventQueue();
                // loop whilst there are events to process
                while (evtQueue.peekEvent() != null) {
                    try {
                        // if there are then get the event
                        AWTEvent evt = evtQueue.getNextEvent();
                        // and dispatch it
                        super.dispatchEvent(evt);
                    catch (java.lang.InterruptedException e) {
                        // if we get an exception in getNextEvent()
                        // do nothing
        // create an instance of our new class
        EvtQueue evtQueue = new EvtQueue();
        // and call the doEvents method to process the events.
        evtQueue.doEvents();
    }Then, the loader checks
java.awt.EventQueue.isDispatchThread()to see if its' inside the eventqueue, and runs doEvents after updating the ProgressMonitor with new setProgress and setNote values.
More precise;
The loader is loading the jar like this:
(this is pseudo code, not really usable, but outlines the vital parts)
public void load() {
monitor = new ProgressMonitor(null, "Loading " + jarName, ""+jarSize + " bytes", 0, jarSize);
monitor.setMillisToDecideToPopup(0);
monitor.setMillisToPopup(0);
// reading jar info code here ...
JarEntry zip = input.getNextJarEntry();
for (;zip != null;) {
     // misc file handling here... total = current bytes read
     monitor.setProgress(total);
     monitor.setNote(note);
     if (java.awt.EventQueue.isDispatchThread()) {
        doEvents();
     zip = input.getNextJarEntry();
monitor.close();
}When debugging doEvents(), there is never any events pending in peekEvents(), even if I tries to put a invokeLater() to run the setProgress on the monitor, why? If it had worked, the doEvents() code would have saved my day...
So, this is where I'm totally stuck...

Just want to describe how I did this using spin from http://spin.sourceforge.net
This example is not pretty, but it can probably help others understanding spin. Cancelling the ProgressMonitor is not implemented, but can easily be done by checking on ProgressMonitor.isCanceled() in
the implementation code.
First, I create a bean for displaying and run a ProgressMonitor:
Spin requires an Interface and an Implementation, but that's just nice programming practice :-)
import java.util.*;
public interface ProgressMonitorBean {
    public void start(); // start spinning
    public void cancel(); // cancel
    public int getProgress(); // get the current progress value
    public void setProgress(int progress); // set progress value
    public void addObserver(Observer observer); // observer on the progressValue
}Then, I created the implementation:
import java.util.*;
import javax.swing.ProgressMonitor;
import java.awt.*;
public class ProgressMonitorBeanImpl extends Observable implements ProgressMonitorBean {
    private ProgressMonitor monitor;
    private boolean cancelled;
    private int progress = 0;
    private int currentprogress = 0;
    public ProgressMonitorBeanImpl(Component parent, Object message, String note, int min, int max) {
        monitor = new ProgressMonitor(parent, message, note, min, max);
        monitor.setMillisToDecideToPopup(0);
        monitor.setMillisToPopup(0);
    public void cancel() {
        monitor.close();
    public void start() {
        cancelled = false;
        progress = 0;
        currentprogress = 0;
        while (progress < m_cMonitor.getMaximum()) {
            try {
                synchronized (this) {
                    wait(50); // Spinning with 50 ms delay
                if (progress != currentprogress) { // change only when different from previous value
                    setChanged();
                    notifyObservers(new Integer(progress));
                    monitor.setProgress(progress);
                    currentprogress = progress;
            } catch (InterruptedException ex) {
                // ignore
            if (cancelled) {
                break;
    public int getProgress() {
        return progress;
    public void setProgress(int progress) {
        this.progress = progress;
}in my class/jarloader code, something like this is done:
public void load() {
ProgressMonitorBean monitor = (ProgressMonitorBean)Spin.off(new ProgressMonitorBeanImpl(null, "Loading " + url,"", 0, jarSize));
Thread t = new Thread() {
    public void run() {
      JarEntry zip = input.getNextJarEntry();
      for (;zip != null;) {
        // misc file handling here... progress = current bytes read
     monitor.setProgress(progress);
t.start(); // fire off loadin into own thread to do time consuming work
monitor.start(); // this will spin events on monitor and block until progress = max
monitor.cancel(); // Just make sure ProgressMonitor is closed
}The beautiful thing here is that Spin is taking care of weither the load() is inside the dispatch thread or not, making the code much simpler and cleaner to understand.
The ProgressMonitorBeanImplementation could been made much nicer and more complete, but I was in a hurry to check if it worked out. And it did! This will be applied on a lot of gui -components that blocks the event-queue in our project, making it much more responsive.
Hope this will help others in similiar situations! Thanks again svenmeier for pointing me to the spin -project.

BSP extension "download" - event handling problem

Folks,
First of all, I apologize if the answer is already out there, but I spent quite some time to find the solution for my problem but finally gave up:
I implemented the Download extension from Brian's and Tom's book. Since I am using an MVC based app, I put the event handling in the DO_HANDLE_EVENT of a controller instead of the OnInputProcessing event of a page. Here's how my app is designed:
I have a main controller that has an execute button to trigger a data selection based on some selection criteria. The result of this selection is displayed by means of a subcontroller with tableviews that are wrapped into my zdownload extension. Everything works fine: I make my selections, execute the app through the button of the main controller and get my result shown in the tableviews. I push the download icon, select my file format (XLS, HTML etc), get the dialog to choose whether to download or to display the file, perfect!
But now after I processed the download successfully - if I click the execute button in the main controller again, I still get the download dialog. It looks like the created event for the download does not get cleared. As I mentioned, I searched through SDN, but all I found were referrals to the call of DISPATCH_INPUT( ) in DO_REQUEST of the main controller, but unfortunately this one is already implemented.
Any ideas?
Thanks,
Guenther

There is an attribute of the download extension called display_url. You pass a value to the extension telling it what cached URL contains the binary content for your download. if this display_url attribute has a value assigned to it, then the element will render an iFrame to call the URl. However if the display_url attribute is empty, it won't render the iFrame. I suspect that you have a stateful application and after your download event you aren't clearing whatever field that you pass into the display_url attribute.

Button Event Handler in a JList, Please help.

Hi everyone,
I have created a small Java application which has a JList. The JList uses a custom cell renderer I named SmartCellRenderer. The SmartCellRenderer extends JPanel and implements the ListCellRenderer. I have added two buttons on the right side inside the JPanel of the SmartCellRenderer, since I want to buttons for each list item, and I have added mouse/action listeners for both buttons. However, they don't respond. It seems that the JList property overcomes the buttons underneath it. So the buttons never really get clicked because before that happens the JList item is being selected beforehand. I've tried everything. I've put listeners in the Main class, called Editor, which has the JList and also have listeners in the SmartCellRenderer itself and none of them get invoked.
I also tried a manual solution. Every time the event handler for the JList was invoked (this is the handler for the JList itself and not the buttons), I sent the mouse event object to the SmartCellRenderer to manually check if the point the click happened was on one of the buttons in order to handle it.
I used:
// Inside SmartCellRenderer.java
// e is the mouse event object being passed from the Editor whenever
// a JList item is selected or clicked on
Component comp = this.getComponent (e.getX(), e.getY())
if(!(comp instanceof JButton)) {
          System.out.println("Recoqnized Event, but not a button click...");
          //return;
} else {
          System.out.println("Recognized Event, IT IS A MOUSE CLICK, PROCESSING...");
          System.out.println("VALUE: "+comp.toString());
What I realized is that not only this still doesn't work (it never realizes the component as a JButton) it also throws an exception for the last line saying comp is null. Meaning with the passed x,y position the getComponent() returns a null which happens when the coordinates passed to it are outside the range of the Panel. Which is a whole other problem?
I have yet to find an example on the web, using Google, that demonstrated using buttons inside a JList.
Can anyone help me with this. Thanks.

A renderer is not a component, so you can't click on it. A renderer is just used to paint a representation of a component at a certain position in your JList.
I have yet to find an example on the web, using Google, that demonstrated using buttons inside a JList.Thats probably because this is not a common design. The following two designs are more common:
a) Create a separate panel for your JButtons. Then when you click on the button it would act on each selected row in the JList
b) Or maybe like windows explorer. Select the items in the list and then use a JPopupMenu to perform the desired functionality.
I've never tried to add a clickable button to a panel, but this [url http://forum.java.sun.com/thread.jspa?threadID=573721]posting shows one way to add a clickable JButton as a column in a JTable. You might be able to use some of the concepts to add 2 button to the JPanel or maybe you could use a JTable with 3 columns, one for your data and the last two for your buttons.

Multiple JComboBox Event Handling Problem

Hi, guys
I am a newbie in Java. I need to create three JComboBox, say date, month and year and a JButton "submit". After I select the entries from the three JComboBox, I click the "search" button to display something in terms of the information I selected, but I have no idea how to write the actionPerformed( ActionEvent evt) to deal with the problem. Can anyone give me some hint?
Any help would be appreciated.

If you are asking how to write a basic event handler for when your button is pressed, RTM.
http://java.sun.com/docs/books/tutorial/uiswing/events/index.html

Button event handler problem

Similar Messages

Maybe you are looking for