History
Contains an array of information on the URLs that the client has visited within a window. This information is stored in a history list and is accessible through the browser's Go menu.
JavaScript 1.1: added |
Created by
History objects are predefined JavaScript objects that you access through the history property of a window object.
Description
To change a window's current URL without generating a history entry, you can use theLocation.replace method. This replaces the current page with a new one without generating a history entry. See Location.replace.
You can refer to the history entries by using the window.history array. This array contains an entry for each history entry in source order. Each array entry is a string containing a URL. For example, if the history list contains three named entries, these entries are reflected as history[0], history[1], and history[2].
If you access the history array without specifying an array element, the browser returns a string of HTML which displays a table of URLs, each of which is a link.
Property Summary
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Method Summary
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watch and unwatch methods from Object.
Examples
Example 1. The following example goes to the URL the user visited three clicks ago in the current window.history.go(-3)Example 2. You can use the
history object with a specific window or frame. The following example causes window2 to go back one item in its window (or session) history:
window2.history.back()Example 3. The following example causes the second frame in a frameset to go back one item:
parent.frames[1].history.back()Example 4. The following example causes the frame named
frame1 in a frameset to go back one item:
parent.frame1.history.back()Example 5. The following example causes the frame named
frame2 in window2 to go back one item:
window2.frame2.history.back()Example 6. The following code determines whether the first entry in the
history array contains the string "NETSCAPE". If it does, the function myFunction is called.
if (history[0].indexOf("NETSCAPE") != -1) {Example 7. The following example displays the entire history list:
myFunction(history[0])
}
document.writeln("<B>history is</B> " + history)This code displays output similar to the following:
history is
Welcome to Netscape http://home.netscape.com/
Sun Microsystems http://www.sun.com/
Royal Airways http://www.supernet.net/~dugbrown/
See also
Location, Location.replace
back
Loads the previous URL in the history list.Syntax
back()
Parameters
NoneDescription
This method performs the same action as a user choosing the Back button in the browser. Theback method is the same as history.go(-1).
Examples
The following custom buttons perform the same operation as the browser's Back button:<P><INPUT TYPE="button" VALUE="< Go Back"
onClick="history.back()">
<P><INPUT TYPE="button" VALUE="> Go Back"
onClick="myWindow.back()">
See also
History.forward, History.go
current
A string specifying the complete URL of the current history entry.Security
Getting the value of this property requires theUniversalBrowserRead privilege. It has no value if you do not have this privilege. For information on security, see the Client-Side JavaScript Guide.
JavaScript 1.1.
This property is tainted by default. It has no value of data tainting is disabled. For information on data tainting, see the Client-Side JavaScript Guide.
Examples
The following example determines whetherhistory.current contains the string "netscape.com". If it does, the function myFunction is called.
if (history.current.indexOf("netscape.com") != -1) {
myFunction(history.current)
}
See also
History.next, History.previous
forward
Loads the next URL in the history list.Syntax
forward()
Parameters
NoneDescription
This method performs the same action as a user choosing the Forward button in the browser. Theforward method is the same as history.go(1).
Examples
The following custom buttons perform the same operation as the browser's Forward button:<P><INPUT TYPE="button" VALUE="< Forward"
onClick="history.forward()">
<P><INPUT TYPE="button" VALUE="> Forward"
onClick="myWindow.forward()">
See also
History.back, History.go
go
Loads a URL from the history list.Syntax
go(delta)
go(location)
Parameters
delta | An integer representing a relative position in the history list. |
location | A string representing all or part of a URL in the history list. |
Description
Thego method navigates to the location in the history list determined by the specified parameter.
If the delta argument is 0, the browser reloads the current page. If it is an integer greater than 0, the go method loads the URL that is that number of entries forward in the history list; otherwise, it loads the URL that is that number of entries backward in the history list.
The location argument is a string. Use location to load the nearest history entry whose URL contains location as a substring. Matching the URL to the location parameter is case-insensitive. Each section of a URL contains different information. See Location for a description of the URL components.
The go method creates a new entry in the history list. To load a URL without creating an entry in the history list, use Location.replace.
Examples
The following button navigates to the nearest history entry that contains the string"home.netscape.com":
<P><INPUT TYPE="button" VALUE="Go"The following button navigates to the URL that is three entries backward in the history list:
onClick="history.go('home.netscape.com')">
<P><INPUT TYPE="button" VALUE="Go"
onClick="history.go(-3)">
See also
History.back, History.forward, Location.reload, Location.replace
length
The number of elements in thehistory array. Security
Getting the value of this property requires theUniversalBrowserRead privilege. For information on security, see the Client-Side JavaScript Guide.
next
A string specifying the complete URL of the next history entry.Security
Getting the value of this property requires theUniversalBrowserRead privilege. It has no value if you do not have this privilege. For information on security, see the Client-Side JavaScript Guide.
JavaScript 1.1.
This property is tainted by default. It has no value if data tainting is disabled. For information on data tainting, see the Client-Side JavaScript Guide.
Description
Thenext property reflects the URL that would be used if the user chose Forward from the Go menu.
Examples
The following example determines whetherhistory.next contains the string "NETSCAPE.COM". If it does, the function myFunction is called.
if (history.next.indexOf("NETSCAPE.COM") != -1) {
myFunction(history.next)
}
See also
History.current, History.previous
previous
A string specifying the complete URL of the previous history entry.Security
Getting the value of this property requires theUniversalBrowserRead privilege. It has no value if you do not have this privilege. For information on security, see the Client-Side JavaScript Guide.
JavaScript 1.1.
This property is tainted by default. It has no value of data tainting is disabled. For information on data tainting, see the Client-Side JavaScript Guide.
Description
Theprevious property reflects the URL that would be used if the user chose Back from the Go menu.
Examples
The following example determines whetherhistory.previous contains the string "NETSCAPE.COM". If it does, the function myFunction is called.
if (history.previous.indexOf("NETSCAPE.COM") != -1) {
myFunction(history.previous)
}
See also
History.current, History.next
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Last Updated: 05/28/99 11:59:35
