Is there a way to force space in field?

Hi,

So I have a field called "striInitDocNum" defaulted to 1 as shown below:

global.DocNumAction =

{

strInitDocNum:"1"

}

The code then inserts a space before this default value:

var dlgInit =

{

"DNum": " " + this.strInitDocNum

}

However, the user may remove this space in the form if they want to set to a different value from 1 to 2, for example:

                                    to

How can I make it so if the user decides to enter a different value than the default, the space in the field is maintained such they cannot delete it? This matters b/c the preview field (not shown) ends up also having a removed space and then it shows as "Exhibit2" instead of "Exhibit 2"

Thanks.

S