| JavaScript
includes what is called a history object. It tracks the
URLs visited by the browser. You can use this browser history as a
means to return to the previous page (or, for that matter, to go
back and forward through the history). This is especially useful
when a hard-coded, specific link is not possible; for instance, in
cases where you do not necessarily know the address of the
previously visited page. This is how a "previous
page" or "go-back" link would appear in your HTML
code:
<a href="javascript:history.go(-1)">
Go Back
</a>
Alternatively, if you
wanted to go forward instead of backward in the history, you would
write the code thus:
<a href="javascript:history.go(1)">
Go Forward
</a>
The numbers in
the parentheses are the number of pages to move (forward or back,
respectively, in the above examples). You can also move more
than one page; for instance javascript.history.go(-3)
would navigate three pages back in the history. Note that if
there is no page in the history to go to, the JavaScript does not
error out; it simply does nothing.
|
