/**
+ * @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.History = (function () {
- var iframe, hiddenField;
- var ready = false;
- var currentToken;
-
- function getHash() {
- var href = location.href, i = href.indexOf("#");
- return i >= 0 ? href.substr(i + 1) : null;
- }
+Ext.define('Ext.util.History', {
+ singleton: true,
+ alternateClassName: 'Ext.History',
+ mixins: {
+ observable: 'Ext.util.Observable'
+ },
- function doSave() {
- hiddenField.value = currentToken;
- }
+ constructor: function() {
+ var me = this;
+ me.oldIEMode = Ext.isIE6 || Ext.isIE7 || !Ext.isStrict && Ext.isIE8;
+ me.iframe = null;
+ me.hiddenField = null;
+ me.ready = false;
+ me.currentToken = null;
+ },
- function handleStateChange(token) {
- currentToken = token;
- Ext.History.fireEvent('change', token);
- }
+ 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;
+ this.fireEvent('change', token);
+ },
+
+ updateIFrame: function(token) {
+ var html = '<html><body><div id="state">' +
+ Ext.util.Format.htmlEncode(token) +
+ '</div></body></html>';
- function updateIFrame (token) {
- var html = ['
',Ext.util.Format.htmlEncode(token),'
'].join('');
try {
- var doc = iframe.contentWindow.document;
+ var doc = this.iframe.contentWindow.document;
doc.open();
doc.write(html);
doc.close();
@@ -51,176 +87,188 @@ Ext.History = (function () {
} catch (e) {
return false;
}
- }
+ },
- function checkIFrame() {
- if (!iframe.contentWindow || !iframe.contentWindow.document) {
- setTimeout(checkIFrame, 10);
+ checkIFrame: function () {
+ var me = this,
+ contentWindow = me.iframe.contentWindow;
+
+ if (!contentWindow || !contentWindow.document) {
+ Ext.Function.defer(this.checkIFrame, 10, this);
return;
}
- var doc = iframe.contentWindow.document;
- var elem = doc.getElementById("state");
- var token = elem ? elem.innerText : null;
+ var doc = contentWindow.document,
+ elem = doc.getElementById("state"),
+ oldToken = elem ? elem.innerText : null,
+ oldHash = me.getHash();
- var hash = getHash();
+ Ext.TaskManager.start({
+ run: function () {
+ var doc = contentWindow.document,
+ elem = doc.getElementById("state"),
+ newToken = elem ? elem.innerText : null,
+ newHash = me.getHash();
- setInterval(function () {
+ if (newToken !== oldToken) {
+ oldToken = newToken;
+ me.handleStateChange(newToken);
+ window.top.location.hash = newToken;
+ oldHash = newToken;
+ me.doSave();
+ } else if (newHash !== oldHash) {
+ oldHash = newHash;
+ me.updateIFrame(newHash);
+ }
+ },
+ interval: 50,
+ scope: me
+ });
+ me.ready = true;
+ me.fireEvent('ready', me);
+ },
- doc = iframe.contentWindow.document;
- elem = doc.getElementById("state");
+ startUp: function () {
+ var me = this;
- var newtoken = elem ? elem.innerText : null;
+ me.currentToken = me.hiddenField.value || this.getHash();
- var newHash = getHash();
+ if (me.oldIEMode) {
+ me.checkIFrame();
+ } else {
+ var hash = me.getHash();
+ Ext.TaskManager.start({
+ run: function () {
+ var newHash = me.getHash();
+ if (newHash !== hash) {
+ hash = newHash;
+ me.handleStateChange(hash);
+ me.doSave();
+ }
+ },
+ interval: 50,
+ scope: me
+ });
+ me.ready = true;
+ me.fireEvent('ready', me);
+ }
- if (newtoken !== token) {
- token = newtoken;
- handleStateChange(token);
- top.location.hash = token;
- hash = token;
- doSave();
- } else if (newHash !== hash) {
- hash = newHash;
- updateIFrame(newHash);
- }
+ },
- }, 50);
+ /**
+ * 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',
- ready = true;
+ /**
+ * 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 (`this` reference) in which the callback is executed. Defaults to the browser window.
+ */
+ init: function (onReady, scope) {
+ var me = this;
- Ext.History.fireEvent('ready', Ext.History);
- }
+ if (me.ready) {
+ Ext.callback(onReady, scope, [me]);
+ return;
+ }
- function startUp() {
- currentToken = hiddenField.value ? hiddenField.value : getHash();
+ if (!Ext.isReady) {
+ Ext.onReady(function() {
+ me.init(onReady, scope);
+ });
+ return;
+ }
- if (Ext.isIE) {
- checkIFrame();
- } else {
- var hash = getHash();
- setInterval(function () {
- var newHash = getHash();
- if (newHash !== hash) {
- hash = newHash;
- handleStateChange(hash);
- doSave();
- }
- }, 50);
- ready = true;
- Ext.History.fireEvent('ready', Ext.History);
+ me.hiddenField = Ext.getDom(me.fieldId);
+
+ if (me.oldIEMode) {
+ me.iframe = Ext.getDom(me.iframeId);
}
- }
- return {
- /**
- * The id of the hidden field required for storing the current history token.
- * @type String
- * @property
- */
- fieldId: 'x-history-field',
- /**
- * The id of the iframe required by IE to manage the history stack.
- * @type String
- * @property
- */
- iframeId: 'x-history-frame',
-
- events:{},
-
- /**
- * 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 (this reference) in which the callback is executed. Defaults to the browser window.
- */
- init: function (onReady, scope) {
- if(ready) {
- Ext.callback(onReady, scope, [this]);
- return;
- }
- if(!Ext.isReady){
- Ext.onReady(function(){
- Ext.History.init(onReady, scope);
- });
- return;
- }
- hiddenField = Ext.getDom(Ext.History.fieldId);
- if (Ext.isIE) {
- iframe = Ext.getDom(Ext.History.iframeId);
- }
- this.addEvents(
- /**
- * @event ready
- * Fires when the Ext.History singleton has been initialized and is ready for use.
- * @param {Ext.History} The Ext.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){
- this.on('ready', onReady, scope, {single:true});
- }
- 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:
- *
-// 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
- * 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).
- */
- add: function (token, preventDup) {
- if(preventDup !== false){
- if(this.getToken() == token){
- return true;
- }
- }
- if (Ext.isIE) {
- return updateIFrame(token);
- } else {
- top.location.hash = token;
+ 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 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=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.
+ */
+ add: function (token, preventDup) {
+ var me = this;
+
+ if (preventDup !== false) {
+ if (me.getToken() === token) {
return true;
}
- },
-
- /**
- * Programmatically steps back one step in browser history (equivalent to the user pressing the Back button).
- */
- back: function(){
- history.go(-1);
- },
-
- /**
- * Programmatically steps forward one step in browser history (equivalent to the user pressing the Forward button).
- */
- forward: function(){
- history.go(1);
- },
-
- /**
- * Retrieves the currently-active history token.
- * @return {String} The token
- */
- getToken: function() {
- return ready ? currentToken : getHash();
}
- };
-})();
-Ext.apply(Ext.History, new Ext.util.Observable());
+
+ if (me.oldIEMode) {
+ return me.updateIFrame(token);
+ } else {
+ window.top.location.hash = token;
+ return true;
+ }
+ },
+
+ /**
+ * 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();
+ }
+});