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Advanced Server Integration with Ext.Direct

Advanced Server Integration with Data and Direct

Many Ext JS developers have yet to take advantage of Ext Direct to directly call server methods from the browser. How to leverage Ext.Direct's existing functionality to make accessing your server data easier while eliminating common boiler-plate code.

Ext JS – An Introduction Ext JS is a cross-browser JavaScript library for building rich internet applications. A Mature Framework. 3 Years Old. Current Version is 3.0RC1. Supports all major browsers. Is highly extensible. Includes lots of off-the-shelf components and widgets. Ext JS - Direct

Introducing Ext.Direct Ext.Direct is a new package in Ext JS 3.0 Ext.Direct is JSONRPC on steroids. It aims to: Bridge the gap between the client and the server. Solve a lot of headaches involved in creating RIA’s such as: Validation. Code Structure – Separation of Logic Trees. Streamline RIA development by: Enabling developers to write less code. Simplifying the Client to Server communication. Ext JS - Direct

Direct Providers Ext.Direct uses providers to handle communication between client and server. Providers facilitate in providing a seamless bridge between client and server. Ext JS - Direct

Direct Providers - JSON Provides a basis for JSON requests to the Direct Server. Good for extending. Can create other providers from this one. Ext JS - Direct

Direct Providers - Remoting It is an RPC bridge for method calling. Execute server side methods seamlessly with client-side stubs Ext JS - Direct

Direct Providers - Polling Bridges to a specific address on the server. Calls the address periodically. Timing is controlled with the interval configuration setting. Ext JS - Direct

Direct Server Specification - Router Must accept two different types of requests. JSON-Encoded Raw HTTP Post. Form Post. Must handle file uploads when using form posts. JSON-Encoded Raw HTTP Posts must be decoded. Must accept batched requests. Must dispatch batch responses. Responses must be JSON encoded. Ext JS - Direct

Direct Server Specification - Router - Response Types Event A JSON response containing two additional keys used to fire an event through the client. These keys are: name – The name of the event to fire. data – Data to be sent back with the response. This is available as one of the event handler’s arguments. This data is not decoded when it reaches the client. Do it manually if the data is JSON. Ext JS - Direct

Direct Server Specification - Router - Response Types RPC A JSON response containing an additional ‘result’ key. Ext JS - Direct

Direct Server Specification - Router - Response Types Exception A JSON response containing two additional keys. message – The error message. where – Details regarding where the error occurred. Exceptions should only be thrown if the server is in debug mode. Exceptions should be suppressed if the server is NOT in debug mode. Output should also be destroyed before the exception handler ends, resulting in an empty response. This can only enhance security. Ext JS - Direct

Direct Server Specification - Router – Other Response keys tid The transaction ID of the request that has just been processed. action The class/module of the request that has just been processed. method The method of the request that has just been processed. Ext JS - Direct

Direct Server Specification - Configuration - Metadata Some languages require less information because they are able to dynamically introspect methods and classes at runtime. Ext JS - Direct


References:
http://www.ibm.com/developerworks/library/wa-aj-streamline/
http://www.ibm.com/developerworks/library/wa-reverseajax2/

Slideshare:
http://www.slideboom.com/presentations/72194/Ext-JS---Direct
http://www.slideshare.net/senchainc/advanced-server-integration-with-data-and-direct
http://www.slideshare.net/stonegao/active-direct-talk-directly-with-activerecord-using-extdirect-and-rack-middleware-2328908
http://www.youtube.com/playlist?list=PL6F9Ss2VSSeJHggI0h57seqVec8xuWCA4

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