I'm using GWT/GXT and trying to create a "normal" ComboBox - one that you cannot type in, but you can type a single character and it will automatically go to the first item in the list that starts with that letter. So, I don't want it READONLY, I want it so that you cannot replace the text in it with your own text (can't type characters into it).
I cannot figure out how to get ComboBox or SimpleComboBox to do this. I've tried every combination of settings on it to no avail. I did see there is a GXT ListBox, but i need a component that extends from Field.
Is there really no way to do this or am I missing something?
By using setEditable(false)
and setForceSelection(true)
and extending the class, you can accomplish this yourself (by watching for key presses on the widget).
First, the subclass:
package net.binarymuse.gwt.gxt.client;
import com.extjs.gxt.ui.client.event.ComponentEvent;
import com.extjs.gxt.ui.client.event.KeyListener;
import com.extjs.gxt.ui.client.widget.form.SimpleComboBox;
public class MySimpleComboBox<T extends String> extends SimpleComboBox<T> {
public MySimpleComboBox() {
super();
this.addKeyListener(new KeyListener(){
@Override
public void componentKeyDown(ComponentEvent event)
{
// Get a reference to the combobox in question
MySimpleComboBox<T> combo = MySimpleComboBox.this;
// Get the character that has been pressed
String sChar = String.valueOf((char) event.getKeyCode());
// TODO - add some checking here to make sure the character is
// one we actually want to process
// Make sure we have items in the store to iterate
int numItems = combo.getStore().getCount();
if(numItems == 0)
return;
// Check each item in the store to see if it starts with our character
for(int i = 0; i < numItems; i++)
{
String value = combo.getStore().getAt(i).getValue();
// If it does, select it and return
if(value.startsWith(sChar) || value.startsWith(sChar.toUpperCase()))
{
MySimpleComboBox.this.setSimpleValue((T) value);
return;
}
}
}
});
}
}
And the test:
package net.binarymuse.gwt.gxt.client;
import com.extjs.gxt.ui.client.widget.form.SimpleComboBox;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.ui.RootPanel;
public class GxtSandbox implements EntryPoint {
public void onModuleLoad() {
SimpleComboBox<String> box = new MySimpleComboBox<String>();
box.add("One");
box.add("Two");
box.add("Three");
box.setEditable(false);
box.setForceSelection(true);
RootPanel.get().add(box);
}
}
Giving the combo box focus and pressing "T" should select "Two" in the list.
As is, the class always selects the first item in the list that starts with the character; however, it would not be difficult to modify it to make it select the next item in the list (as is typical with "real" combo boxes).
Old post but this is very frustrating, I agree. The below is probably what you're looking for.
SimpleComboBox<String> names = new SimpleComboBox<String>();
names.add( "Brian" );
names.add( "Kevin" );
names.add( "Katie" );
names.setTriggerAction( TriggerAction.ALL );
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With