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Yahoo! UI Library

Browser History Manager  2.2.0

Yahoo! UI Library > history > YAHOO.util.History

Class YAHOO.util.History

The History class provides the ability to use the back/forward navigation buttons in a DHTML application. It also allows a DHTML application to be bookmarked in a specific state.

Constructor

YAHOO.util.History ( )

Properties

_bhmReady - private boolean

Flag used to tell whether the Browser History Manager is ready.
Default Value: false

_browser - private string

String identifying which browser we are in. Different code is run depending on which browser you are using.
Default Value: "unknown"

_fqstates - private array

List of fully qualified states. This is used only by Safari.
Default Value: []

_iframe - private HTMLIFrameElement

Our hidden IFrame used to store the browsing history.
Default Value: null

_initialized - private boolean

Flag used to tell whether YAHOO.util.History.initialize has been called.
Default Value: false

_modules - private array

List of registered modules.
Default Value: []

_storageField - private HTMLInputElement|HTMLTextAreaElement

INPUT field (with type="hidden" or type="text") or TEXTAREA. This field keeps the value of the initial state, current state the list of all states across pages within a single browser session.
Default Value: null

_storageFieldReady - private boolean

Flag used to tell whether the storage field is ready to be used.
Default Value: false

Methods

_checkIframeLoaded

private void _checkIframeLoaded ( )
Periodically checks whether our internal IFrame is ready to be used.
Returns: void

_getHash

private string _getHash ( )
location.hash is a bit buggy on Opera. I have seen instances where navigating the history using the back/forward buttons, and hence changing the URL, would not change location.hash. That's ok, the implementation of an equivalent is trivial.
Returns: string
The hash portion of the document's location

_handleFQStateChange

private void _handleFQStateChange ( fqstate )
Sets the new currentState attribute of all modules depending on the new fully qualified state. Also notifies the modules which current state has changed.
Parameters:
fqstate <string> Fully qualified state
Returns: void

_initialize

private void _initialize ( )
Finish up the initialization of the Browser History Manager.
Returns: void

_storeStates

private void _storeStates ( )
Stores all the registered modules' initial state and current state. On Safari, we also store all the fully qualified states visited by the application within a single browser session. The storage takes place in the form field specified during initialization.
Returns: void

_trim

private string _trim ( str )
Trims a string.
Parameters:
str <string> The string to be trimmed.
Returns: string
The trimmed string

getBookmarkedState

string getBookmarkedState ( module )
Returns the state of a module according to the URL fragment identifier. This method is useful to initialize your modules if your application was bookmarked from a particular state.
Parameters:
module <string> Non-empty string representing your module.
Returns: string
The bookmarked state of the specified module.

getCurrentState

string getCurrentState ( module )
Returns the current state of the specified module.
Parameters:
module <string> Non-empty string representing your module.
Returns: string
The current state of the specified module.

getQueryStringParameter

string getQueryStringParameter ( paramName , queryString )
Returns the value of the specified query string parameter. This method is not used internally by the Browser History Manager. However, it is provided here as a helper since many applications using the Browser History Manager will want to read the value of url parameters to initialize themselves.
Parameters:
paramName <string> Name of the parameter we want to look up.
queryString <string> Optional URL to look at. If not specified, this method uses the URL in the address bar.
Returns: string
The value of the specified parameter, or null.

initialize

void initialize ( iframeTarget )
Initializes the Browser History Manager. Call this method from a script block located right after the opening body tag.
Parameters:
iframeTarget <string> Optional - Path to an existing HTML document accessible from the same domain. If not specified, defaults to "blank.html"
Returns: void

navigate

boolean navigate ( module , state )
Call this method when you want to store a new entry in the browser's history.
Parameters:
module <string> Non-empty string representing your module.
state <string> String representing the new state of the specified module.
Returns: boolean
Indicates whether the new state was successfully added to the history.

register

void register ( module , initialState , onStateChange )
Registers a new module.
Parameters:
module <string> Non-empty string uniquely identifying the module you wish to register.
initialState <string> The initial state of the specified module corresponding to its earliest history entry.
onStateChange <function> Callback called when the state of the specified module has changed.
Returns: void

Events

onLoadEvent

onLoadEvent ( )
Fired when the Browser History Manager is ready.

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