Textfield on Delete

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How do I get notified when a user presses the delete button on a textfield?

4 Answers

Accepted Answer

The ASCII code for the delete key is 127. Therefore the following should allow you to detect that the delete key was pressed:

If (textField.charCodeAt(0) == 127) { // your code here; }

I don't know of a listener specifically for this, but there is a way to do it.

Just monitor the value of the TextField, if it becomes empty, then the user hit the clear button. 

if (textField.value == "") {
 // execute something;
}

Thanks antonio. Unfortunately, I need to know if they hit the delete button after the textfield has been cleared.

My solution, not too pretty, but it works for Ti.UI.TextField:

  • After create the TextField (tf), add a variable called _prevValue
  • Listen to event 'change' for tf
  • Initialize _pervValue with the default value
  • In the listener function compare the length of tf().getValue (lenA) and tf._prevValue (lenB). lenA == lenB + 1 implies <del> key was pressed.
  • This method, however, will fail if user perform cut-and-paste to tf

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