/
history.js
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/
history.js
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/*
* Copyright 2009 Matthew Eernisse (mde@fleegix.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
if (typeof fleegix == 'undefined') {
throw new Error('fleegix.history depends on fleegix base module.');
}
fleegix.history = new function () {
// Private vars
var _historyCheck;
var _ieHistory = null;
// Public vars
this.index = 0;
this.currentStep = null;
this.entries = [];
// Private methods
var _getHistoryDoc = function () {
var doc;
if (fleegix.ua.isIE) {
doc = document.getElementById(
"historyFrame").contentWindow.document;
}
else {
doc = document.getElementById(
"historyFrame").contentDocument;
}
return doc;
};
var _getHistoryStep = function () {
var ret;
if (fleegix.ua.isIE) {
ret = _ieHistory;
}
else {
ret = _getHistoryDoc().location.hash.replace('#', '');
}
// This set of conditionals is really important,
// since setting the _ieHistory var cross-window
// results in loss of type information
if (typeof ret == 'number' || (ret && ret.length)) {
return parseInt(ret, 10);
}
else {
return null;
}
};
var _doHistoryCheck = function () {
var step = _getHistoryStep();
if (step != fleegix.history.currentStep) {
fleegix.history.currentStep = _getHistoryStep();
fleegix.history.onchange();
}
_historyCheck = null;
_historyCheck = window.setTimeout(_doHistoryCheck, 200);
};
// Public methods
this.init = function () {
if (!document.getElementById("historyFrame")) {
throw new Error(
'This history code requires an iframe with the id of ' +
'"historyFrame" to exist in the initial page load.');
}
// Set-up the polling:
_historyCheck = window.setTimeout(_doHistoryCheck, 200);
fleegix.event.listen(window, 'onunload', fleegix.history,
'removeHistoryCheck');
};
this.addEntry = function (entry) {
var curr = this.currentStep;
var start = curr + 1;
var removeCount = this.entries.length - curr;
this.entries.splice(start, removeCount);
this.entries.push(entry);
this.index = this.entries.length - 1;
return this.incrementHistory();
};
this.getEntry = function (i) {
return this.entries[i];
};
this.incrementHistory = function () {
var doc = _getHistoryDoc();
this.currentStep = this.index;
// Use the document.write hack to avoid needless
// round-trip in IE
if (fleegix.ua.isIE) {
doc.open("javascript:'<html></html>'");
doc.write('<html><head><scri' +
'pt type="text/javascript">parent.fleegix.history.' +
'onIncremented(' + this.index + ');</scri' +
'pt></head><body></body></html>');
doc.close();
}
// Safari doesn't update the history for changes
// to iframe hashes -- doing a fake form post
// to the hash gets around this. No round-trip
// seems to occur here
else if (fleegix.ua.isSafari) {
doc.body.innerHTML = '<form name="x" action="#' +
this.index + '" method="GET"></form>';
doc.forms[0].submit();
}
else {
doc.location.hash = '#' + this.index;
}
this.index++;
return true;
};
this.onIncremented = function (i) {
_ieHistory = i;
};
this.removeHistoryCheck = function () {
if (_historyCheck) {
window.clearTimeout(_historyCheck);
}
};
this.onchange = function () {};
};