Page 135 - DCAP202_Fundamentals of Web Programming

Fundamentals of Web Programming

Notes  next - The URL of the next document in the history object.
 previous - The URL of the last document in the history object.
10.3.2 History Objects – Methods

The Methods of JavaScript history objects are as follows:
 back() - Go to the previous URL entry in the history list. This does the same thing as the
browser back button.

 forward() - Go to the next URL entry in the history list. This does the same thing as the
browser forward button. This is only effective when there is a next document in the
history list. The back function or browser back button must have previously been used for
this function to work.
 go(relPos | string) - This function will accept an integer or a string. If an integer is used, the
browser will go forward or back (if the value is negative) the number of specified pages in
the history object (if the requested entry exists in the history object).

Self Assessment

Fill in the blanks:
7. The JavaScript ........................... is property of the window object.
8. ........................... function will accept an integer or a string.
9. The ........................... property specifies the number of entries in the history object.

10.4 Location Objects

The JavaScript location object is a property of the window object. It can be used to control the
web page displayed by the browser.
10.4.1 Location Objects – Properties

JavaScript location object has the follwing properties:
 hash - The URL anchor part including the leading hash mark if one exists This is the part of
the URL that is used to point to point to a particular part of a page where a named anchor is.

Notes The hash is the part containing the # sign that points to the particular page location.

 host - The URL hostname and port. The URL http://abc.com/index.html has the host
value of ctdp.tripod.com:80. The colon and port is only included when specified. The URL
http://ctdp.abc.com/index.html has the host value of ctdp.tripod.com.
 hostname - The URL hostname section
 href - The entire URL. The following code will load the home CTDP page: location.href =
“http://ctdp.tripod.com/” The following code will display the URL of the current page:
document.write(location.href)
 pathname - The URL pathname section
 port - The URL port section.

 protocol - The URL protocol section including the colon after the protocol name. The
values are normally http: or file:.

128 LOVELY PROFESSIONAL UNIVERSITY