Need help in Populating Items for 3 jcomboboxes by action listeners

[Jashvika]

Can any one help me for populating the List of Items for 3 combo boxes at runtime by using action listeners

The main idea is First I must load the data for the 3 combo boxes and

when I select an Item in the 1st combobox then the related data should appear in the remaining 2 comboboxes.

for example let the comboboxes should be APPSET, APP, PACKAGE

APPSET(animals,houses)APP(horse,cat,dog,duplex,bunglow)PACKAGE(dog is pet, cat is pet, horse is pet, duplex is 2 storied, bunglow is more than 2)

so if we select (animals) in APPSET then APP combox should populate the items as(horse,cat,dog)and PACKAGE should populate(dog is pet, cat is pet, horse is pet)

and if we again select an item say(dog) from APP combobox then the PACKAGE combobox should display only (dog is pet)

Please any one help me in this

It is very urgent

Thank you very much

[keang]

So what code do you have so far, and what exactly are you stuck on?

Please remember to use code tags when posting code.

[Jashvika]

Hello keang

Sir,

I am using the following code and I used 2 actionlisteners 1 in the APPSET and the other in the APP

// creating AppSet Label
	private JLabel getAppSetLabel() {
		if (this.appSetLabel == null) {
			this.appSetLabel = new JLabel("App Set:");
		}
		return this.appSetLabel;
	}
	//Getting data into APPSet Combo Box
	private JComboBox getAppSetComboBox() {
		if (this.appSetComboBox == null) {
			this.appSetComboBox = new JComboBox();
			// Populate the App Set list
			this.appSetComboBox.addItem("All Application");
			ArrayList<String> anAppSetList = CBRCPMDailyT20AppManager.instance()
					.getAppSetList();
			for (int i = 0; i < anAppSetList.size(); i++) {
				this.appSetComboBox.addItem(anAppSetList.get(i));
			}			
			this.appSetComboBox.addActionListener(new ActionListener() {
				public void actionPerformed(ActionEvent eventset) {
					appSetComboBox_actionPerformed(eventset);
				}
			});
			//this.getAppComboBox();
			//this.appSetComboBox.removeActionListener(appSetComboBox);
		}
		return this.appSetComboBox;
		
	}


//Implementing the action listener
	private void appSetComboBox_actionPerformed(ActionEvent eventset) {		
		String appSet = this.getAppSetComboBox().getSelectedItem().toString();		
		//String appSet = "AMADEUS_ABG";
		this.appSetComboBox.setSelectedItem(appSet);		
		this.getAppComboBox().removeAllItems();
		this.getPackageComboBox().removeAllItems();
		this.appComboBox.addItem("All Application");
		this.packageComboBox.addItem("All Package");
		ArrayList<String> anAppList = CBRCPMDailyT20AppManager.instance()
				.getAppList(appSet);//replace by appSet
		for (int i = 0; i < anAppList.size(); i++) {
			this.appComboBox.addItem(anAppList.get(i));
		}
		ArrayList<String> anPackageList = CBRCPMDailyT20AppManager.instance()
		.getPackageList(appSet);//replace by appSet
        for (int l = 0; l < anPackageList.size(); l++) {
	    this.packageComboBox.addItem(anPackageList.get(l));
       }
		this.appComboBox.setSelectedIndex(0);
		this.packageComboBox.setSelectedIndex(0);
	    
	}
	
	
	//creating App Label
	private JLabel getAppLabel() {
		if (this.appLabel == null) {
			this.appLabel = new JLabel("Application:");
		}
		return this.appLabel;
	}
	//bookingsCombo.removeActionListener(new BookingComboListener());
	//Getting data for App Combo Box
	public JComboBox getAppComboBox() {			
		if (this.appComboBox == null) {
			this.appComboBox = new JComboBox();
			// Populate the App list
			this.appComboBox.addItem("All Application");
			ArrayList<String> anAppList = CBRCPMDailyT20AppManager.instance()
					.getAppList();
			for (int j = 0; j < anAppList .size(); j++) {
				this.appComboBox.addItem(anAppList .get(j));
			}	
			 this.appSetComboBox.removeActionListener(appSetComboBox);
	 		 this.appComboBox.addActionListener(new ActionListener() {
				
				public void actionPerformed(ActionEvent eventpack) {
					appComboBox_actionPerformed(eventpack);
				}
			});
		}
		return this.appComboBox;
	}
	
	//private JComboBox getAppComboBoxpac implements getAppComboBox;
	//{
	
	
	private void appComboBox_actionPerformed(ActionEvent eventpack) {		
		//String appSet = "AMADEUS_CPM";
		String app = this.getAppComboBox().getSelectedItem().toString();
		this.appComboBox.setSelectedItem(app);		
		this.getPackageComboBox().removeAllItems();
		this.packageComboBox.addItem("All Package");
		ArrayList<String> anPackageList = CBRCPMDailyT20AppManager.instance()
				.getPackageListapp(app);//replace by app
		for (int j = 0; j < anPackageList.size(); j++) {
			this.packageComboBox.addItem(anPackageList.get(j));
		}
		this.packageComboBox.setSelectedIndex(0);
	}
	

private JLabel getPackageLabel() {
		if (this.packageLabel == null) {
			this.packageLabel = new JLabel("Package:");
		}
		return this.packageLabel;
	}

	//Getting Data for package combo box
	
	private JComboBox getPackageComboBox() {		
		if (this.packageComboBox == null) {
			this.packageComboBox = new JComboBox();
			// Populate the Package list
			this.packageComboBox.addItem("All Package");
			ArrayList<String> anPackageList = CBRCPMDailyT20AppManager.instance()
					.getPackageList();
			for (int i = 0; i < anPackageList.size(); i++) {
				this.packageComboBox.addItem(anPackageList.get(i));
			}
		}
		return this.packageComboBox;
	}

and I am getting the error as follows

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at client.cpm.dailyT20.CBRCPMDailyT20View.appComboBox_actionPerformed(CBRCPMDailyT20View.java:243)
at client.cpm.dailyT20.CBRCPMDailyT20View.access$1(CBRCPMDailyT20View.java:241)
at client.cpm.dailyT20.CBRCPMDailyT20View$2.actionPerformed(CBRCPMDailyT20View.java:234)
at javax.swing.JComboBox.fireActionEvent(Unknown Source)
at javax.swing.JComboBox.contentsChanged(Unknown Source)
at javax.swing.JComboBox.intervalRemoved(Unknown Source)
at javax.swing.AbstractListModel.fireIntervalRemoved(Unknown Source)
at javax.swing.DefaultComboBoxModel.removeAllElements(Unknown Source)
at javax.swing.JComboBox.removeAllItems(Unknown Source)
at client.cpm.dailyT20.CBRCPMDailyT20View.appSetComboBox_actionPerformed(CBRCPMDailyT20View.java:194)
at client.cpm.dailyT20.CBRCPMDailyT20View.access$0(CBRCPMDailyT20View.java:190)
at client.cpm.dailyT20.CBRCPMDailyT20View$1.actionPerformed(CBRCPMDailyT20View.java:181)
at javax.swing.JComboBox.fireActionEvent(Unknown Source)
at javax.swing.JComboBox.setSelectedItem(Unknown Source)
at javax.swing.JComboBox.setSelectedIndex(Unknown Source)
at javax.swing.plaf.basic.BasicComboPopup$Handler.mouseReleased(Unknown Source)
at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at javax.swing.plaf.basic.BasicComboPopup$1.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

this error is because I am using the following line in the APPSET ActionListener in order to remove all the items in the App combobox and add the current selected items

If I remove this line I am not getting error but my Items in the App combobox are repeating many times

this.getappComboBox.removeAllItems();

Can you please check it and give me any reply

Thanks in Advance

[keang]

The problem is not the line you have mentioned. The problem is occurring in the appComboBox_actionPerformed() method on line 243 (always read the exception stack trace, tells you where the problem is).

Can you tell me which line line 243 is.

Your code is confusing why are you sometimes calling methods to get the JComboBox and at other times using an instance field?

[Jashvika]

Hello Keang Sir,

I am using the code for appComboBox_actionPerformed as follows

private void appComboBox_actionPerformed(ActionEvent eventpack) {		
		//String appSet = "AMADEUS_CPM";
		String app = this.getAppComboBox().getSelectedItem().toString();
		this.appComboBox.setSelectedItem(app);		
		this.getPackageComboBox().removeAllItems();
		this.packageComboBox.addItem("All Package");
		ArrayList<String> anPackageList = CBRCPMDailyT20AppManager.instance()
				.getPackageListapp(app);//replace by app
		for (int j = 0; j < anPackageList.size(); j++) {
			this.packageComboBox.addItem(anPackageList.get(j));
		}
		this.packageComboBox.setSelectedIndex(0);
	}

[keang]

Ok, so which of these lines is line No. 243?

[Jashvika]

Hello Keang Sir,

Thank you very much,

My problem is solved

I used something as below and had got of my erros and I am getting the data for the 3 combo boxes,

[code]

Object selecteditem = getAppComboBox().getSelectedItem();
if (selectedItem == null) return;
String appSet = selectedItem.toString(); [\code]

I used this in the appComboBox action performed ,

So it had taken out the problem,


Thank you very much,