Web.show_document working with abnormal parameter

Question

I was opening some web pages from forms 10g using:
     web.show_document(url, '_blank');
in a button pressed trigger. That worked fine, except it continually opened new pages. If the button is pressed 10 time, 10 pages opened one after another. I was giving warning to the user about this quirk.
Then while debugging I happened to edit the code and change it to:
     web.show_document(url, '_blank;');
With the semicolon at the end of _blank parameter the pages now open in one browser window, replacing itself if the button is repeatedly pressed. This is exactly the functionality I want. However, I can't find any documentation that uses any parameter for web.show_document other then the standard ones without semicolons included.
Does anyone know if this is safe to do?

Answer 1

Hi,
You can use below different parameters depends on your requirements. To view documentation press ctrl+h in forms builder,  use search feature to locate the topic.
'_self' Causes the document to load into the same frame or window as the source document.
'_parent' Causes the target document to load into the parent window or frameset containing the hypertext reference. If the reference is in a window or top-level frame, it is equivalent to the target _self.
'_top' Causes the document to load into the window containing the hypertext link, replacing any frames currently displayed in the window.
'_blank' (default) Causes the document to load into a new, unnamed top-level window. Note that these targets are lowercase and enclosed in single quotation marks.
hope this help you.