/**
* @class Ext.util.History
+ *
* History management component that allows you to register arbitrary tokens that signify application
* history state on navigation actions. You can then handle the history {@link #change} event in order
* to reset your application UI to the appropriate state when the user navigates forward or backward through
* the browser history stack.
+ *
+ * ## Initializing
+ * The {@link #init} method of the History object must be called before using History. This sets up the internal
+ * state and must be the first thing called before using History.
+ *
+ * ## Setup
+ * The History objects requires elements on the page to keep track of the browser history. For older versions of IE,
+ * an IFrame is required to do the tracking. For other browsers, a hidden field can be used. The history objects expects
+ * these to be on the page before the {@link #init} method is called. The following markup is suggested in order
+ * to support all browsers:
+ *
+ * <form id="history-form" class="x-hide-display">
+ * <input type="hidden" id="x-history-field" />
+ * <iframe id="x-history-frame"></iframe>
+ * </form>
+ *
* @singleton
*/
Ext.define('Ext.util.History', {
@@ -12,7 +46,7 @@ Ext.define('Ext.util.History', {
mixins: {
observable: 'Ext.util.Observable'
},
-
+
constructor: function() {
var me = this;
me.oldIEMode = Ext.isIE6 || Ext.isIE7 || !Ext.isStrict && Ext.isIE8;
@@ -21,18 +55,18 @@ Ext.define('Ext.util.History', {
me.ready = false;
me.currentToken = null;
},
-
+
getHash: function() {
var href = window.location.href,
i = href.indexOf("#");
-
+
return i >= 0 ? href.substr(i + 1) : null;
},
doSave: function() {
this.hiddenField.value = this.currentToken;
},
-
+
handleStateChange: function(token) {
this.currentToken = token;
@@ -40,8 +74,8 @@ Ext.define('Ext.util.History', {
},
updateIFrame: function(token) {
- var html = '<html><body><div id="state">' +
- Ext.util.Format.htmlEncode(token) +
+ var html = '<html><body><div id="state">' +
+ Ext.util.Format.htmlEncode(token) +
'</div></body></html>';
try {
@@ -58,17 +92,17 @@ Ext.define('Ext.util.History', {
checkIFrame: function () {
var me = this,
contentWindow = me.iframe.contentWindow;
-
+
if (!contentWindow || !contentWindow.document) {
Ext.Function.defer(this.checkIFrame, 10, this);
return;
}
-
+
var doc = contentWindow.document,
elem = doc.getElementById("state"),
oldToken = elem ? elem.innerText : null,
oldHash = me.getHash();
-
+
Ext.TaskManager.start({
run: function () {
var doc = contentWindow.document,
@@ -86,17 +120,17 @@ Ext.define('Ext.util.History', {
oldHash = newHash;
me.updateIFrame(newHash);
}
- },
+ },
interval: 50,
scope: me
});
me.ready = true;
- me.fireEvent('ready', me);
+ me.fireEvent('ready', me);
},
startUp: function () {
var me = this;
-
+
me.currentToken = me.hiddenField.value || this.getHash();
if (me.oldIEMode) {
@@ -118,94 +152,94 @@ Ext.define('Ext.util.History', {
me.ready = true;
me.fireEvent('ready', me);
}
-
+
},
- /**
+ /**
* The id of the hidden field required for storing the current history token.
* @type String
* @property
*/
fieldId: Ext.baseCSSPrefix + 'history-field',
- /**
+ /**
* The id of the iframe required by IE to manage the history stack.
* @type String
* @property
*/
iframeId: Ext.baseCSSPrefix + 'history-frame',
- /**
+ /**
* Initialize the global History instance.
* @param {Boolean} onReady (optional) A callback function that will be called once the history
* component is fully initialized.
- * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the callback is executed. Defaults to the browser window.
+ * @param {Object} scope (optional) The scope (`this` reference) in which the callback is executed. Defaults to the browser window.
*/
init: function (onReady, scope) {
var me = this;
-
+
if (me.ready) {
Ext.callback(onReady, scope, [me]);
return;
}
-
+
if (!Ext.isReady) {
Ext.onReady(function() {
me.init(onReady, scope);
});
return;
}
-
+
me.hiddenField = Ext.getDom(me.fieldId);
-
+
if (me.oldIEMode) {
me.iframe = Ext.getDom(me.iframeId);
}
-
+
me.addEvents(
- /**
+ /**
* @event ready
* Fires when the Ext.util.History singleton has been initialized and is ready for use.
* @param {Ext.util.History} The Ext.util.History singleton.
*/
'ready',
- /**
+ /**
* @event change
* Fires when navigation back or forwards within the local page's history occurs.
* @param {String} token An identifier associated with the page state at that point in its history.
*/
'change'
);
-
+
if (onReady) {
me.on('ready', onReady, scope, {single: true});
}
me.startUp();
},
- /**
+ /**
* Add a new token to the history stack. This can be any arbitrary value, although it would
- * commonly be the concatenation of a component id and another id marking the specifc history
- * state of that component. Example usage:
- * <pre><code>
-// Handle tab changes on a TabPanel
-tabPanel.on('tabchange', function(tabPanel, tab){
-Ext.History.add(tabPanel.id + ':' + tab.id);
-});
-</code></pre>
+ * commonly be the concatenation of a component id and another id marking the specific history
+ * state of that component. Example usage:
+ *
+ * // Handle tab changes on a TabPanel
+ * tabPanel.on('tabchange', function(tabPanel, tab){
+ * Ext.History.add(tabPanel.id + ':' + tab.id);
+ * });
+ *
* @param {String} token The value that defines a particular application-specific history state
- * @param {Boolean} preventDuplicates When true, if the passed token matches the current token
+ * @param {Boolean} [preventDuplicates=true] When true, if the passed token matches the current token
* it will not save a new history step. Set to false if the same state can be saved more than once
- * at the same history stack location (defaults to true).
+ * at the same history stack location.
*/
add: function (token, preventDup) {
var me = this;
-
+
if (preventDup !== false) {
if (me.getToken() === token) {
return true;
}
}
-
+
if (me.oldIEMode) {
return me.updateIFrame(token);
} else {
@@ -214,25 +248,27 @@ Ext.History.add(tabPanel.id + ':' + tab.id);
}
},
- /**
+ /**
* Programmatically steps back one step in browser history (equivalent to the user pressing the Back button).
*/
back: function() {
window.history.go(-1);
},
- /**
+ /**
* Programmatically steps forward one step in browser history (equivalent to the user pressing the Forward button).
*/
forward: function(){
window.history.go(1);
},
- /**
+ /**
* Retrieves the currently-active history token.
* @return {String} The token
*/
getToken: function() {
return this.ready ? this.currentToken : this.getHash();
}
-});