Change display property from hidden to visible upon clearing a digital field in Adobe Reader

Thank you for reminding me about the show/hide method. In reality and for whatever reason, it had slipped my mind that the show/hide method replaced the display property many years ago. Also, unless something has dramatically changed in the Adobe Acrobat Javascript Reference, I still believe not all methods equally apply to Adobe Reader. Last but not least, changing the appearance of the document once it is signed is by far not my intent (common sense from a legal perspective). Rather my intent is to prevent further changes from being made to the form by the recipient once a digital signature has been applied by the one completing and sending the form (refer to my initial post). While this is easy enough, I should have clarified that the interactive PDF form provides a javascript driven menu for a button that appears along the top of the form. While I can easily enough disable the 'menu' button making it read-only once a digital signature has been applied to the form by a user in Adobe Reader, my intent was to be able to hide the menu button so it is no longer displayed on the form once it has received a digital signature when viewed by a recipient. While I have since been able to figure this out, the issue presents itself in how to reverse the process if/when the user of the form (using Adobe Reader) realizes he may have acted too quickly to sign the form and now wants to reverse the process. The problem is while the end user can right-click to display the context menu to clear the signature field to restore all the fields to what they once were, the menu button still remains hidden (Remember the user is using Adobe Reader not Acrobat). Unfortunately, there is no event handler (I am presently aware of) associated with clearing a digital signature field that can be used to add a JS that changes the show/hide property of the button menu. While I can easily enough accomplish this task in a two step process in adding a JS to the page open event provided the signature field had been cleared b4 the form was last saved, it obviously will not work. Hence, it would be advantageous to have an event handle associated with the signature field when it has been cleared to accomplish this task, i.e., restore the menu button at the same time. Sorry for the length of this reply but I hope this serves to clarify my initial post.

Sorry but you misinterpreted my question. I probably should have clarified that I have been designing/developing javascript enhanced interactive PDF forms since Acrobat first debuted in 1993. As such, I clearly understand what JS methods work and don't work in Adobe Reader. The statement that 'You have to use Acrobat to apply scripts to it' shows me that you obviously misunderstood my question to begin with. I should also add FWIW, I personally designed/developed a datepicker aka EzDatePicker (look it up online) back in 2006 long b4 Adobe finally decided to add their own datepicker to Acrobat DC I believe.