Beeping noise when using script to move to new field

Question

I have a PDF form with multiple text fields and check boxes.  For each of the text fields I have a custom keystroke script that sets the focus to the next text field if the Enter key is pressed or if the field is full.  Below is part of that script:
if(event.keyCode==13) {
this.getField(nextfield).setFocus();
else
if ( event.fieldFull)
this.getField(nextfield).setFocus();
The script is working (the focus changes to the next text field if Enter is pressed or if the field is full), however when the cursor moves to the next field there is a beeping noise.  It's pretty irritating... is there a way to suppress that?
Thanks for your help!

Answer 1

So you want to auto-tab to the next field if Enter is pressed or when the field is full? First of all, you have to set the field as multi-line, otherwise Enter would just commit the value and you won't be able to differentiate it from other characters and catch it. If you do that what you can use is the change property of the event object, like so:
if (event.change.charCodeAt(0)==10) { // If the user pressed Enter
     event.rc = false;  // reject the Enter value
     this.getField("NextField").setFocus(); // tab to the next field
} else if (event.fieldFull) { // If the field is full
     this.getField("NextField").setFocus(); // tab to the next field
Of course, you'll have to set a maximum allowed number of characters for the fieldFull property to become relevant.