Event handling, incrementing with buttons

Hey
struggling a little and hope someone out there might be able to help out
i need to find out how to make a new line appear everytime a button is pressed, the lines are all exactly the same length, just in a different position to the last
the lines are identical and just trying to show a zig zag path.
thanks in advance

Please post an SSCCE*. It's not clear that you're even talking about Java.
* http://mindprod.com/jgloss/sscce.html
~

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Event Handling for HTMLB Buttons

Dear Pros,
How we handle HTMLB Button Events for the following Code in the Layout section:
I want the user to Click this button for Downloading the Internal table displayed onto an Excel file on Presentation Server.
<htmlb:content design="classic" >
<htmlb:page title="page1 " >
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Hi Craig,
Just worked on the code sample you provided. Heres' how my code looks in OnInputProcessing segment:
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then the following code segment:
file = 'C:\ZSS.XLS'.
event = cl_htmlb_manager=>get_event_ex( request ).
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ENDIF.
The problem is that when I push the Download to Excel HTMLB Button, the following Error is being displayed on the page :
500 SAP Internal Server Error
Error message: Exception condition "NO_BATCH" raised. ( type of termination: RABAX_STATE )
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<htmlb:content design="classic" >
<htmlb:page title="page1 " >
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Best Regards,
Vivek.

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Hello,
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Hello Felipe,
Thanks for pointing me to the correct direction.
So on refering to the documentation i tried out a few things. But I am still missing something here.
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Regards,
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OIM 10g Event Handler : Integrated with User Groups.User Members

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Event handler - open with explorer issue

hi all,
I have developed an event handler (itemadded syncronuos) for a library. i need to populate title field
public override void ItemAdded(SPItemEventProperties properties)
base.ItemAdded(properties);
properties.ListItem["Title"] = "some value"
properties.ListItem.SystemUpdate();
I have deployed the same feature to 2 environments -> Dev Env, Test Env.
when I copy and paste a pdf file with "Open with explorer" in Dev Env it works fine.
when I do the same in Test Env i can't copy the file and i get this error:
Error 0x80070057: the parameter is incorrect.
I see this in my Event Viewer
The description for Event ID 14901 from source WebClient cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.
If the event originated on another computer, the display information had to be saved with the event.
Could you help me?
Thanks.

On your local machine you are as you on the server, are you try it on the test server or browsing the test environment from local machine and doing the copy from local machine. also i hope your event handler is not firing on all the list, just make
sure. You can try this in a different library..create a fresh library and see what happen without event handler.
Mark ANSWER if this reply resolves your query, If helpful then VOTE HELPFUL
INSQLSERVER.COM
Mohammad Nizamuddin

Is event handling possible with any object?

can i set a event notification to any object? say for example if i have a multidimensional array of strings can i associate a event handler with it so that when a different application or part of a code changes it's contents i can fire a method?
consider the scenario
initially...
String userId[][]=new String[R][C];
public MyServer()
        userId[0][0] = "mr00047";
        userId[0][1] = "false";
        userId[1][0] = "dider7";
        userId[1][1] = "false";
        userId[2][0] = "thegreendove";
        userId[2][1] = "false";
}now at some point the content of the userId array changes
for(int i=0;i<3;i++)
                if(temp.equals(MyServer.userId[0]))
flag=true;
MyServer.userId[i][1]="true"; // I want to fire a method from this point
break;
can any body tell me how can i do it? please help!!!

This could help you: http://java.sun.com/j2se/1.5.0/docs/api/java/util/Observable.html

Event Handling Techniques with MVC

Hello all,
I have a situation where I have a model that can be thought of like a graph with many nodes and edges. I would like to create a view of this model with a customized JLabel that shows a data value for each node and edge in the model. The event handling to accomplish this has left me a bit perplexed, though. On one hand I was considering something similar to the following:
// a dedicated listener for each label
MyLabel mylabels[] = new MyLabel[numLabels];
for(int i = 0; i != mylabels.length; i++){
MyEventHandler eh = new MyEventHandler(mylabels);
mylabel.addMouseListener(eh);
public class MyEventHandler extends MouseAdapter{
private MyLabel label;
public void mouseClicked(MouseEvent e){
label.setText(etc...);
// at this point I would want to set the value of the point or edge
// that this label corresponds to, not sure of the best strategy
// here either
etc...
The other technique that I am considering might look similar to the following:
// only one listener for all labels
MyLabel mylabels[] = new MyLabel[numLabels];
MyEventHandler eh = new MyEventHandler();
for(int i = 0; i != mylabels.length; i++){
mylabel.addMouseListener(eh);
public class MyEventHandler extends MouseAdapter{
public void mouseClicked(MouseEvent e){
//call a control object in MVC architecture, for more processing
control.update(e.getSource(), (String)input);
etc...
// in the control object class
public void update(Object eventSource, String input){
MyLabel source = (MyLabel)eventSource;
source.setText(input);
// the label would have some kind of index to indicate which one it is
model.setData(source.getIndex(), input);
I am interested in knowing any accepted/popular solutions to situations like this. Are either of my samples worth implementing? I would greatly appreciate any suggestions. Thanks.

I would recommend creating a single listener and add it to every label added to the graph. If you're interested in events that occur outside of the labels (in the background), add a listener to the container of the labels as well.
Unfortunately, you cannot simply add a listener to the container and get all the mouse events from the container's children because Swing's event dispatching system will only dispatch mouse events to a container if the click location was not within any of the container's children. This means that mouse listeners registered to a container will only receive mouse events within the container's background.

Question about event handling in a button

I recently coded a console version of my java program (just outputs stuff into the system console and a logger). I am now adding a simple GUI with a set of buttons to start and stop the program. In order to do this, do I just copy paste the main function contents of the console version of my code into the button's event handlers or is there a way I can just run the main class? I was googling for Class loading in java but I'm not sure if this is what I should be looking at... Can someone please help me out?

MyMainClass.main(new String[] { "the", "arguments" });
// or, if you defined your main to use varags (i.e. as "public static void main(String... args)") then you can just use
MyMainClass.main("the", "arguments");But you should really extract your functionality out of the main method into meaningful classes and methods and just use those from both your console code and your GUI code.

Event handling with button

Hi All,
I am trying to write an event handling on my button, but i seem dont know where to start from. My code are below:
import java.net.*;
import java.io.*;
public class ReadWrite
public static void main(String[] args) throws Exception {
URL myLocalhost = new URL("http://localhost/Write.pl");
URLConnection myURL = myLocalhost.openConnection();
BufferedReader myBR = new BufferedReader(
new InputStreamReader(
myURL.getInputStream()));
String inputLine;
while ((inputLine = myBR.readLine()) != null)
System.out.println(inputLine);
myBR.close();
I want to write a code with a button to run the above code.
Could you please advise?
Thank for any consideration you may give me.

here's the code to read a file, modify for your url connection
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
class Testing extends JFrame implements ActionListener
public Testing()
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    setSize(200,100);
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    JPanel panel = new JPanel();
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    getContentPane().add(panel);
public void actionPerformed(ActionEvent ae)
    BufferedReader myBR = null;
    try
      myBR = new BufferedReader(new FileReader("Test.txt"));
      String inputLine;
      while ((inputLine = myBR.readLine()) != null)
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      myBR.close();
    catch(Exception e){e.printStackTrace();}
public static void main(String args[]){new Testing().setVisible(true);}
}

How can I execute an external program from within a button's event handler?

I am using Tomcat ApacheTomcat 6.0.16 with Netbeans 6.1 (with the latest JDK/J2EE)
I need to execute external programs from an event handler for a button on a JSF page (the program is compiled, and extremely fast compared both to plain java and especially stored procedures written in SQL).
I tried what I'd do in a standalone program (as shown in the appended code), but it didn't work. Instead I received text saying the program couldn't be found. This error message comes even if I try the Windows command "dir". I thought with 'dir' I'd at least get the contents of the current working directory. :-(
I can probably get by with cgi on Apache's httpd server (or, I understand tomcat supports cgi, but I have yet to get that to work either), but whatever I do I need to be able to do it from within the button's event handler. And if I resort to cgi, I must be able to maintain session jumping from one server to the other and back.
So, then, how can I do this?
Thanks
Ted
NB: The programs that I need to run do NOT take input from the user. Rather, my code in the web application processes user selections from selection controls, and a couple field controls, sanitizes the inoputs and places clean, safe data in a MySQL database, and then the external program I need to run gets safe data from the database, does some heavy duty number crunching, and puts the output data into the database. They are well insulated from mischeif.
NB: In the following array_function_test.pl was placed in the same folder as the web application's jsp pages, (and I'd tried WEB-INF - with the same result), and I DID see the file in the application's war file.
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            java.lang.Process pr = pn.start();
            java.io.BufferedInputStream bis = (java.io.BufferedInputStream)pr.getInputStream();
            String tmp = new String("");
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            int i = 0;
            while (i != -1) {
                bis.read(b);
                tmp += new String(b);
            getSelectionsDisplayTextArea().setText(getSelectionsDisplayTextArea().getText() + "\n\n" + tmp);
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            getSelectionsDisplayTextArea().setText(getSelectionsDisplayTextArea().getText() + "\n\n" + ex.getMessage());
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Hi Fonsi!
One way to execute an external program is to use the System Exec.vi. You find it in the functions pallet under Communication.
/Thomas

Javascript embedded in button pl/sql event handler not being executed

Javascript calls not working from pl/sql button event handler. What am I missing? Are specific settings needed to execute javascript from pl/sql proceedures?
Example: Want to toggle target='_blank' off and on in a button pl/sql event handler to open url call in new window & then reset when processing submit is done & the app returns to the form.
portal form button's pl/sql submit handler:
begin
htp.p('<script language=JavaScript>') ;
htp.p('this.form.target="_blank"') ;
htp.p('</script>') ;
PORTAL.wwa_app_module.set_target('http://www.oracle.com') ;
htp.p('<script language=JavaScript>') ;
htp.p('this.form.target="_blank"') ;
htp.p('</script>') ;
end ;
Putting the following in the button's javascript on_click event handler works great:
this.form.target='_blank'
to force opening new window with a call in the button's submit pl/sql code via:
PORTAL.wwa_app_module.set_target('http://www.oracle.com') ;
but then the target='_blank' is left on when the submit is done & we return to the form.
putting the above javascript as a function (called fcn_newpage) elsewhere (e.g., after form opens) & calling in the submit pl/sql with
htp.p('fcn_newpage') ;
also doesn't work.
Metalink thought this was an application issue instead of a bug, so thought I'd see if anyone knows what's going wrong here. (Portal 9.0.4.1)

thanks for your discussion of my post.
Please clarify:
"htp.p('fcn_newwindow') sends a string":
What would you suggest the proper syntax for a function fcn_newwindow() call from a pl/sql javascript block that differs from
htp.p('<script language="Javascript">') ;
htp.p('fcn_newwindow');
htp.p('</script>');
or more simply
htp.p('fcn_newwindow') ;
More generally, what I'm trying to figure out is under what conditions javascript is executed, if ever, in the pl/sql of a button (either the submit or custom event handler, depending on the button).
I've seen lots of posts asking how to do a simple htp.p('alert("THIS IS TROUBLE")') ; in a pl/sql event handler for a button on a form, but no description of how this can be done successfully.
In addition to alerts, in my case, I'd like to call a javascript fcn from a pl/sql event handle that would pass a URL (e.g., http://www.oracle.com) where the javascript fcn executed
window.open(URL). The API call to set_target(URL) in pl/sql has no ability to open in a new window, so calling that is inadequate to my needs and I must resort to javascript.
Its clear in the PL/SQL of a button, you can effect form components since p_session..set_target & p_session.get_target set or get the contents of form components.
So to see if javascript ever works, I tried to focus on something simple that only had to set what amounts to an enviromental variable when we returned to the form after a post. I chose to try to change the html value of TARGET from javascript in the PL/SQL button because it doesn't need to be implemented until we finish the post and return to the form.
So I focused on a hack, setting this.form.TARGET='_blank' in the on_click event handler that forced every subsequent URL call or refresh of the form to be a new window. I then wanted to turn off opening new windows once I'd opened the URL call in a new window by setting TARGET='' in the portal form. I can achieve what I want by coding this.form.TARGET='' in the javascript (on_focus, on_change, or on_mousedown, ...) of every form component that might refresh the form. However, that is a ridiculous hack when a simple htp.p('<script>') ; htp.p('this.form.target=""') ; htp.p('</script>') ; at the end of the button's pl/sql event handle should do the same thing reliably if javascript ever works in the pl/sql event handler.
If we didn't have access to form components through p_session calls, I'd assume it was a scope issue (what is available from the pl/sql event handler). But unless my syntax is just off, when, if ever, can javascript be used in a portal form's pl/sql event handler for a button?
if I code a javascript funtion in the forms' pl/sql before displaying form:
htp.p('<script language="JavaScript">') ;
htp.p('function fcn_new_window(URL)') ;
htp.p('window.open(URL)' ) ;
htp.p('</script>') ;
the function can be called from a button's on_click javascript event handler:
fcn_new_window('http://www.oracle.com')
but from the same button's pl/sql submit event handler this call doesn't work: htp.p('fcn_new_window("http://www.oracle.com")')
So my questions remain: Is there other syntax I need, or does javascript ever work properly from the pl/sql of a form button's event handler? If it doesn't work, isn't this a bug that should be fixed by Oracle?
I can probably figure out hacks to make things work the way I need, but executing javascript from pl/sql event handlers seems to be the expected way to affect portal html pages (forms, reports, ...) and it seems not to work as expected. I don't feel I should have to implement hacks for something as simple as calling a javascript function from pl/sql when almost every example I've found in metalink or the forums or Oracle Press's "portal bible" suggests using javascript from pl/sql via the utility htp.p() to effect web page components in portal.
My TAR on the subject, while still open, returned the result basically: "We can reproduce your situation. Everything looks okay to us, but we can't explain how to use javascript where you want or point you to any documentation that would solve your problem or expain why it should not work the way you want it to. We don't feel its a technical issue. Why don't you post the problem on the portal applications forum."
I'm hoping I'm just missing something fundamental and everything will work if I implement it a little differently. So if anyone sees my error, please let me know.
by the way, not sure this is germain, but in reference to your comment:
"redirections in pl/sql procedures give a peculiar result. in a pl/sql procedure, usually, portals give the last redirection statement and ignore anything else coming after it."
if I try to raise an alert:
htp.p('alert("you screwed up")');
return;
in a pl/sql event handler, it still doesn't raise the alert, even though its the last thing implemented in the event handler. But if I set the value of a text box using p_session..set_value_as_string() at the same spot, it correctly sets the text box value when I return to the form.

Migration from Serial polling to Serial queue with event handler

Hi, I am trying to migrate from classical serial polling communications to serial queue with "event handler" for the buttons pressed by the user. I have placed four while loops, one for the event handler, a second one for serial reading, a third one for serial writing (depending on what button was pressed) and the last one for processing what was read from the serial reading while loop, via a queue.
My attached device reads the signals from 8 sensor ( 4 temperature and another 4 temperature plus humidity in the same sensor ) and send them via serial to Lavbiew.
First of all, only once just after running the LV program, I must turn on my attached device with an ON command plus a carriage return after that the device will respond with the number of sensors plugged to it, disabling the corresponding buttons in the front panel. Then labview must wait until I pressed Acquire Button (event handler) and send a CF command plus what sensors to acquire plus a carriage return, then the device will respond continuously to labview with the sensor readings until I press the stop button (event handler), there is also another button to exit the program, also with event handler.
I am having problems using the event handler and the queues because I am new using these structures, I have looked at the LV examples but there is nothing concrete on using serial with event handler and queue.
Take a look at my VI and you will soon notice what kind of problems I am having, any suggestions will welcome.
Thank's in advance.
Regards.
Attachments:
serial queue.zip ‏76 KB

Hi Luisete,
Maybe the problem arise because you are En- and DeQueue in parallel. You do a lot of things in parallel, that is nice if you are sure that one loop doesn't have to wait for another loop. Make sure you don't dequeue before enqueue.
Hope this helps
I never knew that the standard error cluster output could be wired directly to the loop control of a while loop.
First time I see this

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.

Event handler elements inside of the array

I have an array of clusters, of which inside the cluster are buttons. I want to be able to tie an event handler to these buttons ( they would all handle the event the same, the only difference would be the index they were handling)
A while back a similiar problem was posted here:
http://forums.ni.com/t5/LabVIEW/Array-of-Clusters-with-Graph-Y-Scale-Change-Event/td-p/1194181/page/...
However, this solution did not appear to be able to deliver the index of which button in the array was pressed .. this is critical for my application. The button is basically an "edit' buttonw which allows the user to edit the elements of the cluster through a popup. Obviously I need to know which cluster the user intends to edit.

nathand wrote:
One option: when the code starts, build an array of references to the edit buttons inside each cluster. Then, in the event case, search that array for the reference that triggered the event. The index at which the reference is found tells you which cluster to edit.
This might work, but it should be possible for the user to add/delete elements from the array so I would need to be able to do this even after program initialization.
Currently, I have just made dozen buttons alongside the array of clusters. But this workaround won't allow past a fixed number at program initialization.

Event handling, incrementing with buttons

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