What is store in Ext JS?
Summary. The Store class encapsulates a client side cache of Ext.data.Model objects. Stores load data via a Ext.data.proxy.Proxy, and also provide functions for sorting, filtering and querying the Ext.data.Model instances contained within it.
What is Xtype in Ext JS?
xtype is an easy way to create Components without using the full class name. This is especially useful when creating a Ext. Container that contains child Components. An xtype is simply a shorthand way of specifying a Component – for example you can use xtype: ‘panel’ instead of typing out Ext.
What is widget in Extjs?
Ext. Widget is a light-weight Component that consists of nothing more than a template Element that can be cloned to quickly and efficiently replicate many instances. Widget is typically not instantiated directly, because the default template is just a single element with no listeners.
What is the data package in ext.js?
Data package is used for loading and saving all the data in the application. Data package has numerous number of classes but the most important classes are − The base class for model is Ext.data.Model. It represents an entity in an application. It binds the store data to view.
Which is the base class for ext.data.store?
Here, the name should be the same as the dataIndex, which we declare in the view and the mapping should match the data, either static or dynamic from the database, which is to be fetched using store. The base class for store is Ext.data.Store. It contains the data locally cached, which is to be rendered on view with the help of model objects.
How is dynamic data fetched in ext.js?
Dynamic data can be fetched using proxy. We can have proxy which can fetch data from Ajax, Rest, and Json. The base class for proxy is Ext.data.proxy.Proxy. Proxy is used by Models and Stores to handle the loading and saving of Model data. Client proxies include Memory and Local Storage using HTML5 local storage.
How is a store registered in ext.data.storemanager?
Any Store that is instantiated with a storeId will automatically be registered with the Ext.data.StoreManager. This makes it easy to reuse the same store in multiple views: Stores are backed up by an ecosystem of classes that enables their operation. To gain a full understanding of these pieces and how they fit together, see: