Separate HTML for GLOBAL Foil 50 Use of Dummy Frames in JavaScript

HELP! * YELLOW=global GREY=local Global HTML version of Foils prepared 21 February 97

Foil 50 Use of Dummy Frames in JavaScript

From Feb 17/19 Delivered Lecture for Course CPS616 -- aJavaScript Language Objects and Frames CPS616 spring 1997 -- Feb 17 and 19 1997. by Geoffrey Fox * Important Information in IMAGE

Secs 93.6

<HEAD> Bunch of JavaScript</HEAD>

<BODY>

Sundry actions that load a new URL into page

</BODY>

will result in loss of all JavaScript methods and properties as you load new page! This can be avoided by using dummy frames as below

<HEAD> Bunch of JavaScript</HEAD>

<FRAMESET ROWS="1,*" >

<FRAME NAME="DUMMY" >

<FRAME NAME="ActualFrame" SRC="Thiscontainsoldbodyhtml.html" >

</FRAMESET>

Now use target="ActualFrame" in <a href="URL"> and reloading ActualFrame will NOT destroy your JavaScript!

Note we defined a dummy frame which occupied one pixel (could use zero!) above ActualFrame

The * notation tells Netscape to assign the remaining rows to second frame

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Page produced by wwwfoil on Fri Feb 21 1997