Javascript for saving PDF with name from text field

[Stefan12345678]

Could someone please tell me how to correct the script below or provide an alternate script that will allow me to pull text from a text field labeled "ID" to use in performing a SAVE AS and RENAME with a form button in a PDF?

Thanks!!!!

I took this script from:

https://acrobatusers.com/forum/javascript/generating-filename-when-saving-acrobat-form/

where the "ID" text field = 19746

but I get an error that says:

Error! Could not save as: /C/Users/Me/underdfined19746.pdf

// get the value of the form field
var text1Value = this.getField("ID").value;
// here you need to make sure that no illegal characters are used, and also that text1Value is not empty
// make a file name from the field value
var newFileName = text1Value + ".pdf";
// get the path where the file is currently located
var filePath = this.path.replace(this.documentFileName);
// create the new full path
var newFullFilePath = filePath + newFileName;
try {
this.saveAs(newFullFilePath); // Only this will not work from a button...
} catch (e) {
app.alert("Error! Could not save as: " + newFullFilePath);
}

[Bernd Alheit]

Your second parameter of replace is not defined:

http://www.w3schools.com/jsref/jsref_replace.asp

[try67]

Change this line:

var filePath = this.path.replace(this.documentFileName);

To:

var filePath = this.path.replace(this.documentFileName, "");

However, saving a file in this way requires a privileged context, which means you can't simply do it from a button field. See: https://acrobatusers.com/tutorials/trust-and-privilege-in-acrobat-scripts