how can i delete the auto generated java.awt.event.ActionEvent evt in Netbeans when i double click in Swing on a Button?
Here is a sample from a auto generated Button-Click. How can i delete the unused parameter? Sadly the Codeline is grayed out in Netbeans.
private void sampleActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
}
thanks in forward!
" How can i delete the unused parameter?"
The answer is, you Don't want it deleted. The parameter is necessary. Why? If you look in the uneditable auto-generated initCompoents(), you will see something like this
jButton1.addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent e){
jButton1ActionPerformed(e);
}
});
And the editable method they create for you is the
private void jButton1ActionPerformed(ActionEvent e) {}
which requires the ActionEvent to be passed to it
Go to this
delete java.awt.event.ActionEvent evt
Go to Design and right click on button and select properties then click on Events and remove the unwanted one which you added wrongly.
Related
i haved create this metod for add listeners in my dataChooser.
public final void añadirEsccuhaDataChoser() {
jDateChooser1.getDateEditor().addPropertyChangeListener((PropertyChangeEvent e) -> {
if ("date".equals(e.getPropertyName())) {
listarviajes1();
}
});
this.add(jDateChooser1);
}
but the result who i have obtened after run the project is this.
datachooser moved
but the my original desing is this.
data chooser original position
the method i haved situate into the public vReservas().
situation method
What can I do to prevent the dataChooser from moving?
this is a solution.
solution
The problem is that I created a method, instead of adding the listener in the JdateChooser's internal code.
The code to add the listener is the same, just place it in the custom code option of the jDateChooser.
the ubication of listener
I find that a useful way to draw attention to a jcombobox when one wants the user to select from it is to make it drop down at the point it gains focus usually when the previous item has been completed by the user.
How can this been done in Java?
You could do:
comboBox.addFocusListener(new FocusAdapter() {
#Override
public void focusGained(FocusEvent e) {
comboBox.showPopup();
}
});
You want JComboBox#setPopupVisible
Add in a FocusListener to monitor for focus gained and you should be right.
Depending on if the combo box is editable or not, you may need to add a focus listener to the editor as well
rightclick on the combo box. go to events ---> mouse ----> mouseentered.
it will take you to :
private void jComboBox1MouseEntered(java.awt.event.MouseEvent evt) {}
inside the curly braces, type: jComboBox1.showPopup();
it should look like:
private void jComboBox1MouseEntered(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
jComboBox1.showPopup();
}
I'm using a JComboBox to search a query from a sql DB. I want to search query when a letter is typed. I'm using net beans IDE. Here is the automated code.
srch.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent evt) {
srchKeyReleased(evt);
}
}
private void srchKeyReleased(java.awt.event.KeyEvent evt) {
//Searching code
}
But nothing happens. I'm sue that there is no error in searching code.
Please give me the code to do this without automated code from IDE.
name of JComboBox is srch . Combo box editable=true.
Thank you.
Since your combobox is editable, you should try this:
srch.getEditor().getEditorComponent().addKeyListener()
instead of this
srch.addKeyListener()
I'm building a Gui using net beans (Java) and my question is how to get the string in the text field to the variable without pressing the Enter key?
I wrote this code:
private void idTextBoxActionPerformed(java.awt.event.ActionEvent evt) {
this.Id = evt.getActionCommand();
}
The problem is that if I just enter the text and move to the next text field, the data doesn't go into the Id variable, if I press Enter everything OK.
Pressing Enter invokes an ActionEvent from that textfield which you listen for in your actionPerformed method and that is why your code only works in that scenario.
You could use a FocusListener to acheive what you want. You will want to listen for the focusLost event, which is when you move away from the textfield.
class foo implements FocusListener {
JTextField textField = new JTextField("A TextField");
textField.addFocusListener(this);
public void focusGained(FocusEvent e) {
// Do whatever you want
}
public void focusLost(FocusEvent e) {
// Save the text in the field to your id variable
}
}
EDIT
The following tutorial shows how to use a formatted textfield. You can ignore the formatting bit and focus on the propertyChangeListner aspect of it.
The idea is the same as my first example but using a different type of listener.
You could use the action event or focus event to track the changes at component level. But if its the text changes that you are interested in, then you should consider using a DocumentListener. Read the tutorial here
In My Eclipse Project, I have a
Text custom_text = new Text(....);
Now I add a listener -
custom_text.addKeyListener(new
KeyListener(){
#Override public void keyPressed(KeyEvent event) {
}
#Override public void
keyReleased(KeyEvent event) {
System.err.println("event
"+event.getSource()));
} });
Anyhow, I am not getting the source name,despite I am getting the output as Text {}.
Well I want to get the source name ie custom_text .
How to get the output in a listener as
custom_text
IMHO you can not the name of the variable, holding the reference to your textfield. It is also not really of any use to know the name of the variable, since you can have many referencing variables.
With .getSource() you get a full reference to the widget itself, so you can deal with it in any way.
You can use event.widget to identify wich widget notify event.
But general approach is relaying with anonymous listener.
because it can use more readable method name which is more fit to subject of controller.
Text nameField, emailField = ...
nameField.addListener(SWT.KeyUp, new Listener(){
public void handleEvent(Event e){
handleNameEdited();
}
});
emailField.addListener(SWT.KeyUp, new Listener(){
public void handleEvent(Event e){
handleEmailEdited();
}
});