Hi,
Naive, little 'ol me is back. This time with TextBox and event
questions.
I have a textbox and a button. When the page first loads the textbox
is empty and the button is disabled. If one or more non-white-space
characters are typed in the box then then I want the button to become
enabled. I am sort-of doing this now -- except that it takes two
characters to trigger the events.
searchTerm.addChangeHandler(new ChangeHandler() {
@Override
public void onChange(ChangeEvent event) {
if (searchTerm.getValue().trim().equals("")) {
searchButton.setEnabled(false);
} else {
searchButton.setEnabled(true);
}
}
});
searchTerm.addKeyPressHandler(new KeyPressHandler() {
@Override
public void onKeyPress(KeyPressEvent event) {
if (searchTerm.getValue().trim().equals("")) {
searchButton.setEnabled(false);
} else {
searchButton.setEnabled(true);
if (event.getCharCode() == KeyCodes.KEY_ENTER) {
getInfo();
}
}
}
});
I started with only the ChangeHandler but I do not seem to understand
what defines "chenge". I know that my audience will want to use
"enter" as a "submit" so I added the KeyPressHandler.
So with the above I see the following: With a blank TextBox I have a
disabled searchButton. If I type one non-whitespace character in the
textbox nothing happens -- the searchButton does not become enabled.
If I type a second non-whitespace character then the button does
become enabled.
Maybe I should use a KeyDown handler instead of a ChangeHandler?
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