Multi Language Js file for i18n

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Ext.Loader.setConfig({enabled: true});

Ext.Loader.setPath('Ext.ux', '../ux/');

Ext.require([
    'Ext.data.*',
    'Ext.tip.QuickTipManager',
    'Ext.form.*',
    'Ext.ux.data.PagingMemoryProxy',
    'Ext.grid.Panel'
]);

Ext.onReady(function(){
    MultiLangDemo = (function() {
        // get the selected language code parameter from url (if exists)
        var params = Ext.urlDecode(window.location.search.substring(1));
        //Ext.form.Field.prototype.msgTarget = 'side';
               
        return {
            init: function() {
                Ext.tip.QuickTipManager.init();
           
                /* Language chooser combobox  */
                var store = Ext.create('Ext.data.ArrayStore', {
                    fields: ['code', 'language', 'charset'],
                    data : Ext.exampledata.languages // from languages.js
                });
               
                var combo = Ext.create('Ext.form.field.ComboBox', {
                    renderTo: 'languages',
                    store: store,
                    displayField:'language',
                    queryMode: 'local',
                    emptyText: 'Select a language...',
                    hideLabel: true,
                    listeners: {
                        select: {
                            fn: function(cb, records) {
                                var record = records[0];
                                window.location.search = Ext.urlEncode({"lang":record.get("code"),"charset":record.get("charset")});
                            },
                            scope: this
                        }
                    }
                });
       
                if (params.lang) {
                    // check if there's really a language with that language code
                    var record = store.findRecord('code', params.lang, null, null, null, true);
                    // if language was found in store assign it as current value in combobox
                    if (record) {
                        combo.setValue(record.data.language);
                    }
                }           
           
                if (params.lang) {
                    var url = Ext.util.Format.format("../../locale/ext-lang-{0}.js", params.lang);
               
                    Ext.Ajax.request({
                        url: url,
                        success: this.onSuccess,
                        failure: this.onFailure,
                        scope: this
                    });
                } else {
                    this.setupDemo();
                }
            },
            onSuccess: function(response, opts) {
                eval(response.responseText);
                this.setupDemo();
            },
            onFailure: function() {
                Ext.Msg.alert('Failure', 'Failed to load locale file.');
                this.setupDemo();
            },
            setupDemo: function() {
                /* Email field */
                Ext.create('Ext.FormPanel', {
                    renderTo: 'emailfield',
                    labelWidth: 100, // label settings here cascade unless overridden
                    frame: true,
                    title: 'Email Field',
                    bodyStyle: 'padding:5px 5px 0',
                    width: 380,
                    defaults: {
                        msgTarget: 'side',
                        width: 340
                    },
                    defaultType: 'textfield',
                    items: [{
                        fieldLabel: 'Email',
                        name: 'email',
                        vtype: 'email'
                    }]
                });
           
                /* Datepicker */
                Ext.create('Ext.FormPanel', {
                    renderTo: 'datefield',
                    labelWidth: 100, // label settings here cascade unless overridden
                    frame: true,
                    title: 'Datepicker',
                    bodyStyle: 'padding:5px 5px 0',
                    width: 380,
                    defaults: {
                        msgTarget: 'side',
                        width: 340
                    },
                    defaultType: 'datefield',
                    items: [{
                        fieldLabel: 'Date',
                        name: 'date'
                    }]
                });
           
                // shorthand alias               
                var monthArray = Ext.Array.map(Ext.Date.monthNames, function (e) { return [e]; });
                var ds = Ext.create('Ext.data.Store', {
                     fields: ['month'],
                     remoteSort: true,
                     pageSize: 6,
                     proxy: {
                         type: 'pagingmemory',
                         data: monthArray,
                         reader: {
                             type: 'array'
                         }
                     }
                 });
                            
                 Ext.create('Ext.grid.Panel', {
                     renderTo: 'grid',
                     width: 380,
                     height: 203,
                     title:'Month Browser',
                     columns:[{
                         text: 'Month of the year',
                         dataIndex: 'month',
                         width: 240
                     }],
                     store: ds,           
                     bbar: Ext.create('Ext.toolbar.Paging', {
                             pageSize: 6,
                             store: ds,
                             displayInfo: true
                     })
                 });
           
                // trigger the data store load
                ds.load();           
            }
        };
   
    })();
    MultiLangDemo.init();
});