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/**
* Generic state object (singleton), for supporting Ajax browser history
*
* $Id$
*
*/
var it_state =
{
it_iframe: null,
it_history_field: null,
it_store_handlers: [],
it_restore_handlers: [],
/**
* Register a handler that gets called before creating a history entry
* @param p.object Object that contains handler method
* @param p.method Method of p.object to call
*/
register_store_handler: function(p)
{
this.it_store_handlers[this.it_store_handlers.length] = p;
},
/**
* Register a handler that gets called after restoring a history entry
* @param p.object Object that contains handler method
* @param p.method Method of p.object to call
* @param p.initial optional flag: if true, handler is called with initial empty state
*/
register_restore_handler: function(p)
{
this.it_restore_handlers[this.it_restore_handlers.length] = p;
// If we already have state data, call registered handler immediately. Yup this _is_ needed!
if (this.it_history_field && this.it_history_field.value)
p.object[p.method]();
},
/**
* Create a new history entry, saving all values of it_state (asynchronously)
* Users must call this without parameter!
*/
new_history_entry: function(p)
{
// ED('it_state::new_history_entry()');
if (!this.it_iframe && !(this.it_iframe = document.getElementById('it_state')))
ED('it_state::new_history_entry(): it_state object not found!');
this.it_iframe.src = "/itjs/state.html?t="+it_now();
this.it_history_field = null;
},
/**
* Restore state from history, called from iframe's onload handler but in main window's context
*/
restore_history: function()
{
if (!this.it_iframe && !(this.it_iframe = document.getElementById('it_state')))
ED('it_state::restore_history(): it_state object not found!');
var idoc = it_get_iframe_document(this.it_iframe);
this.it_history_field = idoc ? idoc.getElementById('state') : {}; // Work-around IE5 not returning iframe document
if (this.it_history_field.value)
{
var res = eval('({' + this.it_history_field.value + '})');
// ED('it_state::restore_history(): restoring these settings:', res);
for (var key in res)
this[key] = res[key];
}
for (var i in this.it_restore_handlers)
{
if (this.it_history_field.value || (this.it_restore_handlers[i].initial && (!idoc || !it_get_iframe_document(this.it_iframe).location.href.match(/t=/))))
this.it_restore_handlers[i].object[this.it_restore_handlers[i].method]();
}
},
/**
* Call all store handlers and store state in it_history_field
*/
store_state: function()
{
if (!this.it_iframe && !(this.it_iframe = document.getElementById('it_state')))
ED('it_state::store_state(): it_state object not found!');
var idoc = it_get_iframe_document(this.it_iframe);
this.it_history_field = idoc ? idoc.getElementById('state') : {}; // Work-around IE5 not returning iframe document
for (var i in this.it_store_handlers)
this.it_store_handlers[i].object[this.it_store_handlers[i].method]();
var ser = [];
for (var key in this)
{
var value = this[key], type = typeof(value);
if (!key.match(/^it_/) && type.match(/boolean|number|string/))
ser[ser.length] = key + ':' + ((type == 'string') ? "'" + value.replace(/([\\'])/g, '\\\1') + "'" : value);
}
// ED('it_state::store_state()', ser);
this.it_history_field.value = ser.join(',');
}/* NO COMMA */
}
function it_state_restore_history()
{
it_state.restore_history();
}
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