How to mask input character

With LiveCycle Designer you can select a 'password' field from the library of fields.

With Acrobat Forms tool you need to use the 'app.response()' method with the password parameter enabled.

thanks for the response, what I did is I created a text field. At the docReady event of the text field, I called a prompt box using var pass = app.response("Please enter Password:", "Document Control Only"); So without using the password field in the library, how can I display the input string as '*'?
Because if I use the password field given in the library, how can I show it as a pop up box?

I do not think there is a way because there is no password response popup and no password field for the appliction dialog objet.

To remove the JavaScript warning, you will need to create a foder level trusted function or certify the final form.

app.response("Response prompt goes here.","Title","Default Text", 1)

I don't use LiveCycle, but in regular Acrobat:

app.response has the parameter of bPassword. If it is set to True, the response field is masked with asterisks.

The script app.response("Response prompt goes here.","Title","Default Text", 1) did mask the input string to '*'. The problem now is the title text is displaying Warning: JavaScript Window - Title. How can I remove the "Warning: JavaScript Window" and what is the 1 used for?

This changed in version 7 with the trusted functions, you will have to certify each document to get rid of it. Do a search on here there should be plenty of info about it.

You can also create a folder level script to call the 'app.alert' as a trusted function with privileges. But this folder level scrip will need to be added to each users system.