C# | What Is ExtJS

ExtJS4 & ASP.NET MVC3 Dictionary

See my previous example on getting ExtJS4 working with ASP.NET MVC3

Back when I used to work with ASP.NET AJAX Extensions 1.0 (5 year old tech), I used to do the following all the time:

JavaScript

Ext.Ajax.request({
	url: ...
	, jsonData: { data: form.getForm().getValues() }
	...
}); // eo Ajax

ASP.NET AJAX Extensions 1.0

[WebMethod(EnableSession = true)]
public static void MyWebMethod( Dictionary<string,object> data )
{
	...
}

…ASP.NET AJAX Extensions 1.0 handled the conversion of data from JSON to C# Dictionary, which is a pleasure to work with. To my great disappointment, I discovered that ASP.NET MVC3, the latest and greatest, won’t do that for you! I had to find a solution…
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ASP.NET MVC3 & ExtJS4 Errors

In my previous post I presented an example of a basic ASP.NET MVC3 controller connecting to an ExtJS4 data store and passing some data in XML format via store’s load method.

So far I’ve run into just one issue with this setup – clean error handling. By default, ASP.NET MVC will spit out any exceptions in clear text (with <html> tags and everything), which is not very useful when building a quality web application. Here’s what I want on my errors:

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Rating: 9.4/10 (7 votes cast)

ASP.NET MVC3 XML & ExtJS4

In this example I will demonstrate how to use an ExtJS4 store to perform an XML data read from an ASP.NET MVC3 controller. First let me say that I wasted a LOT of time reading fake tutorials on these keywords – seems there are a lot of people who can explain the ASP.NET MVC3 side, but not how to actually connect it to an ExtJS4 store using a clean proxy, AND pass parameters to the server. Especially using XML for the return data.

So, let’s say we just want a basic search box – when user types something in and hits Search, we will use an ExtJS4 store and POST to an ASP.NET MVC3 method, passing the search query as a JSON parameter, while returning results in XML. Here’s the basic ExtJS model & store configuration:

// Basic model
Ext.define('MY.model.SearchResult', {
	extend: 'Ext.data.Model',
	fields: ['id','html']
});
 
// Basic store
Ext.create('Ext.data.Store',{
	model: 'MY.model.SearchResult',
	proxy: Ext.create('MY.proxy.MSAjaxProxy', {
		url: '/User/Search',
		reader: { type: 'xml', root: 'matches', record: 'match' }
	}) // eo proxy
}) // eo store

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ASP.NET AJAX & ExtJS 4 in 2-way JSON (2)

In this example we will use what we learned to build a “MSAjaxProxy” – just like a normal AjaxProxy, except geared towards IIS 6+ running MS AJAX Extensions 1.0. Proxies are used by all ExtJS stores (combos, grids, trees, etc.), so we would be able to do something like this:

{
	xtype: 'combo'
	, displayField: 'attrName'
	, valueField: 'attrID'
	, store:
	{
		fields: ['attrID','attrName']
		, proxy: Ext.create('MyOrg.proxy.MSAjaxProxy', {
			url: 'Default-UMRA.aspx/Test'
			, reader: { type: 'json' }
		}) // eo proxy
	} // eo store
}

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ASP.NET AJAX & ExtJS 4 in 2-way JSON (1)

In this example series I will show you something that might save you some headache – using ExtJS 4 AJAX controls with IIS 6+ running MS AJAX Extensions 1.0. We will need to make a custom proxy for use in stores, which are utilized throughout ExtJS4, i.e. in a combo:

Data will travel back and forth between our server-side C# code and client-side ExtJS 4 in efficient JSON packets, such as: {param:’test’}
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