Limiting Text Box to Alpha Only A-Z using Acrobat 9 Standard

Question

I'm trying to set a text box in my form to only accept alpha A-Z only.  Can anyone tell me how to go about doing this.  I'm working with Acrobat 9 Standard using a PDF file.  Thanks!

Answer 1

OK, it's a little more complicated with Standard than it shold be, but begin by adding the following JavaScript to the first page's Page Open event (Pages panel > right-click on first page > Page Properties > Actions > Page Open > Run a JavaScript > Add) :
// Allow just upperse letter from A to Z
function alphaOnly_ks() {
    // Get all of the characters that have been entered in to the field
    var value = AFMergeChange(event);
    // Do nothing if field is blank
    if(!value) return;
    // Reject the entry if the entry doesn't match the regular expression
    if(!AFExactMatch(/^[A-Z]+$/, value)) event.rc = false;
Just copy and paste that entire block of code.
Now in the text field you need to call this function in the Keystroke event (right-click field with Select Object tool active > Properties > Format tab > Custom format category > Custom Keystroke Script > Edit) like this:
// Limit this field to uppercase letters from A-Z
alphaOnly_ks();
If you only have one page in the document, close the document and reopen it. If there are more than one page, go to a different page and return. This has the effect of loading the script so it is available from the field. If you were using Pro, you could place the function in a document-level JavaScript and avoid this nonsense.
The field should now only allow entry of uppercase letters from A-Z. It possible to alter the script so that any lowercase letters are automatically converted to uppercase.