On click select all text in a form field

Problem

In some scenarios a form user may need to go through a form replacing values in the fields. If the user has a preference for using the keyboard and tabbing to the field then this is easy as the contents of the field is selected, when the user starts typing they overwrite the value. 
If your users have a preference for using the mouse then the behaviour is a bit different. When the user clicks into a field they go into insert mode at the point where they click. To replace the contents of the fields they can delete all the characters and start typing, or press Ctrl-A (to select the fields contents) and then start typing, or select the contents of the field with the mouse and start typing. In this situation it would be easier for the user if clicking into a field selected the contents.

Solution

The solution here was to add some code to the click event of the fields to replicate the behaviour of the tabbing though the form.

Detailed explanation

The code in the click event is;

xfa.host.setFocus(SelectOnClick.somExpression);
app.setTimeOut("xfa.host.setFocus('"+this.somExpression+"');",50);

This code sets the focus to the field SelectOnClick then 50 milliseconds later sets the focus back to the current field, setting focus this way causes the contents of the field to be selected, just like tabbing to it.

For this to work the field SelectOnClick must be set to Visible (Print Only), which means it can still receive focus but is not visible to the user. Then in the prePrint event set the field to hidden and in the postPrint event set the field to visible so the user won't see it on paper either.

This sample, OnClickSelect.pdf, shows a normal field, a field with the above click event code and a field that selects all text on a double click.