Using SilkJS ORM and ExtJS Grids Together

**mschwartz** · 12 Dec 2011, 7:13 AM

SilkJS is a very fast JavaScript based HTTP server (http://silkjs.org) that was designed to work with ExtJS. All code for the server is written in JavaScript, including almost the entirety of the server itself. You can check out the server's github repository: http://github.com/mschwartz/SilkJS and the repository for this demo at http://github.com/mschwartz/SilkJS-ext.

The SilkJS Install.js script creates a /usr/share/SilkJS directory with the HTTP server, library files, and default documentRoot. It also installs the main HTTP server in /usr/local/bin/httpd-silk.js.

Let's examine the SilkJS-ext repository first.

config.js:

Code:

Config.mysql = {
	host: 'localhost',
	user: 'mschwartz',
	passwd: '',
	db: 'ext3'
};
Config.documentRoot = 'docroot';

This file overrides the default Config object, specifying MySQL connection information, and a documentRoot for this example.

The actual Server-Side JavaScript code is implemented in < 60 lines of code, in Server.js:

Code:

SQL = new MySQL();
SQL.connect();


Schema.add({
	name: 'Users',
	fields: [
		{ name: 'userId', type: 'int', autoIncrement: true, defaultValue: 0 },
		{ name: 'username', type: 'varchar', size: 64, header: 'User Name', width: 128, autoExpand: true, editable: true },
		{ name: 'password', type: 'varchar', size: 64, header: 'Password', serverOnly: true, editable: true },
		{ name: 'email', type: 'varchar', size: 128, header: 'E-Mail Address', width: 128, editable: true },
		{ name: 'created', type: 'int', defaultValue: function() { return parseInt(new Date().getTime() / 1000, 10); }, header: 'Created', width: 150, format: 'DateTime', editable: false }
	],
	primaryKey: 'userId',
	indexes: [
		'username',
		'email'
	]
});


function main_action() {
	res.write([
		'<!doctype html>',
		'<html>',
		'	<head>',
		'		<title>Schema / ExtJS Demo</title>',
		'		<link rel="stylesheet" type="text/css" href="/ext-3.4.0/resources/css/ext-all.css" />',
		'	</head>',
		'	<body>',
		'	<script type="text/javascript" src="/ext-3.4.0/adapter/ext/ext-base.js"></script>',
		'	<script type="text/javascript" src="/ext-3.4.0/ext-all-debug.js"></script>',
		'	<script type="text/javascript" src="/client/Ext.ux.SchemaGrid.js"></script>',
		'	<script type="text/javascript" src="/client/ViewPort.js"></script>',
		'	<script type="text/javascript">',
		'		Schemas = ' + Json.encode(Schema.getSchemaExtJs()) + ';',
		'	</script>',
		'	</body>',
		'</html>'
	].join('\n'));
	res.stop();
}
function Server_action() {
	switch (req.data.method) {
		case 'listUsers':
			Json.success(Schema.list('Users', {}, function(o) {
				o = Schema.clean(o);
			}));
		case 'editUser':
			var example = Json.decode(req.data.example);
			example.userId = example.userId || 0;
			Schema.putOne('Users', example);
			Json.success();
		case 'deleteUsers':
			var examples = Json.decode(req.data.examples);
			forEach(examples, function(example) {
				Schema.remove('Users',example);
			});
			Json.success();
	}
}

The first thing it does is create a global MySQL object, named SQL. This SQL object is used by the ORM to generate queries. With the ORM, you rarely have to generate any queries yourself, and even then, the ORM does most of the work.

The Schema.add() method is called to install a "Schema" in the ORM. The Schema is defined as a JavaScript object. The definition above shows only a part of what's possible. The name member is the name of the table in the database. The fields array is an array of field definitions. The primaryKey member is the primary key of the table, and the indexes array is an array of additional indexes to be created for the table.

For the fields array, each item is an object with a few required members and some optional ones. The required ones are name, and type. If type is 'varchar', then size is also required. Only one of the fields may be autoIncrement: true, and is typically the primaryKey of the table as well. This autoIncrement field is also typically the ID field of ExtJS DataStores on the client-side.

The defaultValue member may be an expression or a function. The defaultValue member is used to set a default value for the field when creating a new entry in the database. As you can see in the example above, we have a 'created' field of type 'int' (a Unix-style timestamp) that has a defaultValue of a function that creates a Unix timestamp for the current time.

One additional members may be specified. Note the password field is marked serverOnly: true - this is to specify that the value of this field should not be sent to the client (we'll see this later).

Every other member of a field definition is ignored by the ORM, currently, and can be used for your application for whatever purposes you like. In this case, I specify information that will help us generate ExtJS Grid columns, and form fields for editing records. For example, username is autoExpand: true, and fields with header: 'some string' will show in the grids, etc.

The SilkJS HTTP server will call main_action() (if it is defined) if / is the specified URL. Here we simply write a typical HTML document to the browser. The output HTML looks like this:

Code:


<!doctype html>


<html>


	<head>


		<title>Schema / ExtJS Demo</title>


		<link rel="stylesheet" type="text/css" href="/ext-3.4.0/resources/css/ext-all.css" />


	</head>


	<body>


	<script type="text/javascript" src="/ext-3.4.0/adapter/ext/ext-base.js"></script>


	<script type="text/javascript" src="/ext-3.4.0/ext-all-debug.js"></script>


	<script type="text/javascript" src="/client/Ext.ux.SchemaGrid.js"></script>


	<script type="text/javascript" src="/client/ViewPort.js"></script>


	<script type="text/javascript">


		Schemas = {"Users":{"name":"Users","fields":[{"name":"userId","type":"int","autoIncrement":true,"defaultValue":0},{"name":"username","size":64,"header":"User Name","width":128,"autoExpand":true,"editable":true},{"name":"password","size":64,"header":"Password","serverOnly":true,"editable":true},{"name":"email","size":128,"header":"E-Mail Address","width":128,"editable":true},{"name":"created","type":"int","header":"Created","width":150,"format":"DateTime","editable":false}],"primaryKey":"userId"}};


	</script>


	</body>

http://en.wikipedia.org/wiki/Query_by_Example.

All records in SilkJS and ExtJS are effectively just JavaScript objects, each member is a column/value pair from the database. But not every field from the database must exist in these objects! A partial record of this form is what I call an "example." If you call Schema.find(example), it will do a SELECT query based upon the fields you do specify in the example. For example, Schema.find({ username: '%msch%' }) will return an array of records from the DB that have a username with 'msch' somewhere in it. Schema.putOne({ username: 'mschwartz' }) will store a new record in the database with defaultValues for the other fields and username set to 'mschwartz'. The only way I can explain examples is with examples! :)

So editUser expects the client to build an example and send it over. If editing an existing record, the example will have a userId, and the record will be updated by Schema.putOne(). If adding a new record, the example will have no userId or a userId set to 0.

The deleteUsers method expects an array of examples. It calls Schema.remove(example) on each element of the array, which deletes the specified rows from the DB. Schema.remove() can be dangerous if you're not careful about the examples you give it. In this case, the array of examples would be some multiple selections on the grid on the client side.

The client-side ExtJS code is in docroot/client and accessed via /client/whatever paths in the HTML. In this case, we have just two files, Viewport.js and Ext.ux.SchemaGrid.js.

ViewPort.js is rather simple:

Code:

Ext.onReady(function() {
	var items = [];
	for (var i in Schemas) {
		var schema = Schemas[i];
		items.push({
			xtype: 'ext-ux-schemagrid',
			title: i,
			schema: schema,
			method: 'list'+i
		});
	}


	new Ext.Viewport({
		layout: 'fit',
		items: [
			{
				xtype: 'tabpanel',
				activeTab: 0,
				items: items
			}
		]
	})
});

It loops through the global Schemas and creats an items array of Panel configs, one Schema Grid per panal. The Ext.ViewPort is simply a Ext.TabPanel with one tab per panel.

The real work on the client is done by Ext.ux.SchemaGrid.js:

Code:

Ext.ux.SchemaGrid = Ext.extend(Ext.grid.GridPanel, {
	initComponent: function() {
		var me = this,
			schema = me.initialConfig.schema,
			fields = schema.fields,
			id = Ext.id();


		var store = new Ext.data.JsonStore({
			root: 'list',
			totalProperty: 'count',
			idProperty: schema.primaryKey,
			url: '/Server',
			baseParams: {
				method: me.initialConfig.method,
			},
			fields: fields,
			listeners: {
				load: function() {
					me.updateToolbar();
				}
			}
		});
		var sm = new Ext.grid.RowSelectionModel({
			singleSelect: false,
			listeners: {
				rowselect: function() {
					me.updateToolbar();
				},
				rowdeselect: function() {
					me.updateToolbar();
				}
			}
		});
  		var columns = [],
			fieldHash = {};
		var autoExpandColumn = undefined;
		for (var i in fields) {
			var field = fields[i];
			fieldHash[field.name] = field;
			if (field.header && !field.serverOnly) {
				if (field.autoExpand) {
					autoExpandColumn = field.name;
				}
				columns.push({
					header: field.header,
					id: field.name,
					format: field.format,
					dataIndex: field.name,
					width: field.width,
					renderer: me.renderField
				});
			}
		}
		var config = {
			sm: sm,
			store: store,
			columns: columns,
			autoSizeColumns: true,
			autoFill: true,
			stripeRows: true,
			trackMouseOver: true,
			loadMask: true,
			autoExpandColumn: autoExpandColumn,
			buttonId: id
		};
		Ext.apply(this, Ext.apply(this.initialConfig, config));
		me.tbar = new Ext.Toolbar({
			items: [
				{
					text: 'Add',
					id: 'add-'+id,
					handler: function() {
						me.editRecord({});
					}
				},
				{
					text: 'Edit',
					id: 'edit-'+id,
					handler: function() {
						me.editRecord(me.getSelectionModel().getSelected().data);
					}
				},
				{
					text: 'Delete',
					id: 'delete-'+id,
					handler: function() {
						me.deleteRecords();
					}
				}
			]
		});
		me.bbar = new Ext.PagingToolbar({
			store: store,
			pageSize: 25,
			displayInfo: true,
			displayMsg: 'Displaying ' + me.initialConfig.schema.name + '{0} - {1} of {2}',
			beforePageText: 'Page',
			emptyMsg: 'Nothing to Display'
		});
		Ext.ux.SchemaGrid.superclass.initComponent.apply(me, arguments);
		me.on({
			'render': function() {
				store.reload();
			}
		});
		me.fieldHash = fieldHash;
	},
	updateToolbar: function() {
		var me = this,
			id = this.buttonId;
		var selections = me.getSelectionModel().getSelections();
		if (selections.length) {
			Ext.getCmp('delete-'+id).enable();
			if (selections.length == 1) {
				Ext.getCmp('edit-'+id).enable();
			}
			else {
				Ext.getCmp('edit-'+id).disable();
			}
		}
		else {
			Ext.getCmp('delete-'+id).disable();
			Ext.getCmp('edit-'+id).disable();
		}
	},
	editRecord: function(record) {
		var me = this,
			id = Ext.id(),
			schema = me.initialConfig.schema,
			fields = schema.fields,
			primaryKey = schema.primaryKey;
		record = record || {};
		var items = [];
		for (i in fields) {
			var field = fields[i];
			if (field.header && field.editable) {
				items.push({
					xtype: 'textfield',
					fieldLabel: field.header,
					anchor: '100%',
					id: field.name + '-' + id,
					name: field.name,
					value: record[field.name]
				})
			}
		}
		var dialog = new Ext.Window({
			title: record[primaryKey] ? 'Edit Record' : 'Add Record',
			width: 640,
			height: 480,
			modal: true,
			layout: 'fit',
			items: [
				{
					xtype: 'form',
					frame: true,
					labelWidth: 150,
					items: items
				}
			],
			buttonAlign: 'center',
			buttons: [
				{
					text: 'OK',
					handler: function() {
						for (var i=0, len = items.length; i<len; i++) {
							var cmp = Ext.getCmp(items[i].id);
							if (cmp) {
								record[items[i].name] = cmp.getValue();
							}
						}
						Ext.Ajax.request({
							url: '/Server',
							params: {
								method: 'editUser',
								example: Ext.encode(record)
							},
							success: function(response) {
								dialog.close();
								me.store.reload();
							}
						});
					}
				},
				{
					text: 'Cancel',
					handler: function() {
						dialog.close();
					}
				}
			]
		});
		dialog.show();
	},
	deleteRecords: function() {
		var me = this,
			records = me.getSelectionModel().getSelections(),
			len = records.length;
		var examples = [];
		for (var i=0; i<len; i++) {
			examples.push(records[i].data);
		}
		Ext.Ajax.request({
			url: '/Server',
			params: {
				method: 'deleteUsers',
				examples: Ext.encode(examples)
			},
			success: function(response) {
				me.store.reload();
			}
		});
	},
	renderField: function(value, p, r) {
		var me = this,
			format = me.format;
		switch (format) {
			case 'DateTime':
				return new Date(value*1000).toString();
			default:
				return value;
		}
	}
});


Ext.reg('ext-ux-schemagrid', Ext.ux.SchemaGrid);

I don't want to go into great detail about how this custom component works, but I will explain some of the things it does. I figure you all know how ExtJS works...

SchemaGrid extends Ext.grid.GridPanel and takes as additional config options a Schema, and a method. Those are set in the ViewPort.js code.

In the initComponent method, the URL of the JsonStore is set to /Server (so Server_action() is called on the SilkJS side), and baseParams method is set to the SchemaGrid's config.method, listUsers in our case. The JsonStore's fields are directly used from the Schema's fields array (no muss, no fuss!).

After setting up the SelectionModel, the code loops through the Schema's fields and generates column definitions for the grid. Those fields that have a header member and are not serverOnly will have columns displayed. The renderer for each column is a single method in the SchemaGrid class. The default action for our renderer is to render the created/timestamp in human readable format. An autoExpand column may be specified in the Schema definition, and it is handled automatically by this code.

When the JsonStore is loaded or the user clicks on items in the grid, the updateToolbar() method is called to conditionally enable and disable the edit and delete buttons. Basically, you can only edit if ONE row is selected, and you can't delete unless at least one row is selected.

The editRecord() method dynamically creates a form in a modal dialog window. If a record is passed in, the dialog title says "Edit record" otherwise "Add record." The dialog/form can be used to add new records (click the add button) or edit existing records (select a record, click edit button).

When the OK button is clicked on the dialog, the record (EXAMPLE) is updated with the form fields' values and the Ext.Ajax.request() made to call editUser to update the database.

The deleteRecords() method is called to delete one or more selected records in the grid. It creates the array of examples and calls Ext.Ajax.request() to invoke deleteUsers on the server side.

So let's see it in action!

The attached snapshot1.png is the application when it first starts.

The attached snapshot2.png is the application after I click the add button.

The attached snapshot3.png is the application after I've added a few records.

The attached snapshot4.png is the application after I've selected the bbb record and clicked edit.

**mschwartz** · 12 Dec 2011, 7:20 AM

So what's so neat about this?

If you edit the Schema definition at the top of Server.js, those changes will immediately be reflected in the database when you either restart the server or the browser makes a new request (reload the browser, click the reload button in the paging toolbar).

What do I mean? If you change the size of password field to 128, the ORM will submit the appropriate ALTER TABLE statements to MySQL to change the size of the field. If you add a field to the fields array, it will be added to the table in the DB as well. If you delete a field, it will be deleted in the DB. If you rename a field, it will be renamed in the DB.

If you add a second Schema definition at the top of Server.js, the table will be created next access. If you reload your browser, you will see TWO tabs, one for each table, and the CRUD operations work on each.

Outside of the Schema definitions, which are compact in their own right, and the main_action() method that spews out the HTML for the app, the entire CRUD operations on the server side consist of under 20 lines of code.

The entire demo took me under 1 hour to create, all but 2-3 minutes was spent writing the client-side code.

**edykstra** · 17 Feb 2013, 8:04 AM

Hey mschwartz,

I have used ExtJS a lot for complex desktop (RIA) type apps. These projects have been Rails on the server side. I see a LOT of code duplication to define models etc. on each side.

I have a new project being planed, and I will be doing both the server and client side code. While I can poke around a bit in Rails, there is MUCH for me to learn still, and I am not sure I want to climb that learning curve. The time may be better spent learning NodeJS and related technologies.

The app will have Responsive and Mobile interfaces for 'consumers' and a very complex RIA 'webtop' in ExtJS for 'administrators'. There will also be a very scaled down mobile interface for 'administrators' too.

I don't see the need for 'real-time' via sockets or Meteor etc., but some of the requirements make me think that is a possibility. Mostly, I see for those few instances, I could use ExtJS polling initially, but that may not scale well server side if this app becomes popular.

So, I guess I am asking if you could give an update to this thread. Is SilkJS still the way to go? Does it allow common model code for client/server side with ExtJS 4+? Any other suggestions working with ExtJS and server side JS?

Thanks!

Eric

**mschwartz** · 17 Feb 2013, 2:23 PM

Originally Posted by edykstra

Hey mschwartz,

I have used ExtJS a lot for complex desktop (RIA) type apps. These projects have been Rails on the server side. I see a LOT of code duplication to define models etc. on each side.

I have a new project being planed, and I will be doing both the server and client side code. While I can poke around a bit in Rails, there is MUCH for me to learn still, and I am not sure I want to climb that learning curve. The time may be better spent learning NodeJS and related technologies.

The app will have Responsive and Mobile interfaces for 'consumers' and a very complex RIA 'webtop' in ExtJS for 'administrators'. There will also be a very scaled down mobile interface for 'administrators' too.

I don't see the need for 'real-time' via sockets or Meteor etc., but some of the requirements make me think that is a possibility. Mostly, I see for those few instances, I could use ExtJS polling initially, but that may not scale well server side if this app becomes popular.

So, I guess I am asking if you could give an update to this thread. Is SilkJS still the way to go? Does it allow common model code for client/server side with ExtJS 4+? Any other suggestions working with ExtJS and server side JS?

Thanks!

Eric

Hey Eric,

I'm absolutely using SilkJS with the ORM to implement the server side for ExtJS4.

https://github.com/mschwartz/SilkJS-extjs4

This demo implements Ext.ux.SchemaGrid class. The Grid implements a toolbar with CRUD buttons (new, edit, delete), and a popup window with form in it to edit records. The grid columns, form fields, and the database schema (table definitions) are all defined on the server side. If you edit the server side code and add columns, delete columns, etc., the database is altered (alter table) accordingly and you'll see new columns and form fields on the client side to match.

I've started with that demo to create two different ExtJS projects in the past few months.

If you have any issues getting any of this to run, PM me.

As for polling, I measure 0-4ms for some pretty complicated short poll requests using SilkJS on a micro type virtual machine instance. In theory, you should be able to get at least 250 clients polling at 1/second, 500 at 2/second, etc. Scale it like you would apache (server farm behind load balancer) and you can do a huge number of clients.

The http://silkjs.net/ WWW site is entirely served by SilkJS.

Cheers

**natedsaint** · 18 Jun 2013, 10:13 AM

This... is awesome.

One of our devs recently went to Fluent and everyone was talking about how great SilkJS was looking. After attempting to build something similar to this and getting flustered with all the dependency issues with NodeJS, this is going to get forked as soon as I have a minute.

Looking at the silkJS stuff I've seen, is there any planned support for a something like a freetds system to connect to a db like sybase?

**edykstra** · 18 Jun 2013, 10:30 AM

NatedSaint,

I'll let Mike answer your specific question - but I thought I would chime in with some things I've learned since I last posted in this thread.

Overall - SilkJS is too new to have 'all the bells and whistles' that other frameworks have. But, really, that is a moot point, because you can use pretty much any library anyways. Mike has designed it extremely well, because there is a ton of power without complexity. Those 2 characteristics usually conflict. Not so in SilkJS.

Same goes for 'Best Practices' for ... say ... MVC. There is no documentation on how to do 'MVC' because there is no need. You are not constrained at all - and can arrange the folders/files the way you want to support your preference for MVC - or whatever.

It would be nice if there were more 'tools'. For example, in a Rails app, I am used to deploying with a simple; 'cap staging deploy:migrations'. Still no worries - I wrote my own using SilkJS. It isn't ready to post to GitHub, but will be soon.

I don't know Rails well at all. I know Node.js even less. But what I do know is that with SilkJS, I was productive very quickly. It only took a few days. It is a very shallow learning curve. Any road-blocks I hit, Mike helped me with very quickly.

SilkJS may currently have a small following, and that raises a concern that it is too obscure to support in the future if you need to assign a new developer to it etc. But again that is a moot point, because it is all JavaScript (except for the 'glue' to the OS) and a shallow learning curve like I mentioned. So, anyone can pick it up fast. Further, SilkJS is essentially a 'wrapper' around the Google V8 Javascript engine. So, Mike has been able to highly leverage a gazillion man-hours that Google invested and will continue to support. Smart. Sweet.

I was planning on learning Rails soon. Then Node. Now I am skipping both and just using SilkJS.

Cheers,

Eric

**mschwartz** · 18 Jun 2013, 10:48 AM

Originally Posted by natedsaint

This... is awesome.

One of our devs recently went to Fluent and everyone was talking about how great SilkJS was looking. After attempting to build something similar to this and getting flustered with all the dependency issues with NodeJS, this is going to get forked as soon as I have a minute.

Looking at the silkJS stuff I've seen, is there any planned support for a something like a freetds system to connect to a db like sybase?

Thanks Eric for his validation that SilkJS does work. I'd add that the WWW server is written in JavaScript. The whole thing is ~1500 lines - hardly a lot to figure out.

I honestly never heard of freetds. However, I just found their site and looked at the documentation and it really shouldn't be difficult to implement the glue (between JS and C++) to make all that callable from JavaScript code.

The MySQL glue (using libmysqlclient) took me me less than a day. I implemented an Oracle API as well. https://github.com/mschwartz/SilkJS-Oracle. It's a self-installing plugin for SilkJS. See the build.js script for details.

The real trick with Oracle was the implementation of my ORM for it. The idea being that you use the ORM and you get JavaScript like objects with "some" backing store. The ORM being mostly transparent about using either MySQL or Oracle to actually store the objects. There were some portability issues, like Oracle having seriously restricted column name lengths and that sort of thing.

Unfortunately, I have no real experience with Sybase or MS SQL. It would be one thing to implement the glue, and a very different one to test it

Being an open source project, though, help from the community makes it possible.

**natedsaint** · 18 Jun 2013, 10:53 AM

Thanks for the prompt reply!

The reason I asked in the first place is that I've been debating writing some fast unit testing that actually hits our DB, but our back end is an interesting set of configurations (mod_perl and Sybase) although the front end is Ext 4. Thus, I've been trying to find a way to create JavaScript tests that run on the server with minimal success. I tried with node and a freetds library, but it had a ton of dependencies that wouldn't work with our configs.

I'll see if I can figure out what all needs to be done to tie the pieces together. I've just forked everything from github so if nothing else I can see what I can break on my own server!

**mschwartz** · 18 Jun 2013, 10:58 AM

You can trivially invoke a perl program from SilkJS using process.exec().

http://silkjs.net/documentation/buil...s#process-exec

Function: process.exec

Synopsis

var output = process.exec(command_line);
Execute a Unix command, returning the output of the command (it's stdout) as a JavaScript string.
Description

This function calls popen() with the specified command line and reads its output until end of file. Under the hood, a fork() and exec() is performed which is not particularly fast. Still it can be useful to execute shell commands.
Arguments

{string} command_line - a Unix command to execute

Returns

{string} output - the output of the command executed.

Back to top

Function: process.exec_result();

Synopsis

var result = process.exec_result);
Returns the exit code of the last process.exec() call.
NOTE: The value is the low-order 8 bits of the argument the program run by exec() passed to _exit(2) or exit(3).
Returns

{int} result - exit code

Originally Posted by natedsaint

Thanks for the prompt reply!

The reason I asked in the first place is that I've been debating writing some fast unit testing that actually hits our DB, but our back end is an interesting set of configurations (mod_perl and Sybase) although the front end is Ext 4. Thus, I've been trying to find a way to create JavaScript tests that run on the server with minimal success. I tried with node and a freetds library, but it had a ton of dependencies that wouldn't work with our configs.

I'll see if I can figure out what all needs to be done to tie the pieces together. I've just forked everything from github so if nothing else I can see what I can break on my own server!

**natedsaint** · 18 Jun 2013, 11:03 AM

That's actually something I hadn't considered...
I could potentially just write a thin layer to hit the database and pass what I need. The real issue here is that I was seeing if I could get lift from developing a back-end ORM that allows us to create some schema definitions once rather than twice. While I could potentially have the perl just output the JSON-encoded return from the db, I'd still ultimately have to do the work there.

I'll look into how complex it is to get some "glue" built for communication between a SilkJS server and the db itself, but when it comes to c++ I'm hopeless

Thread: Using SilkJS ORM and ExtJS Grids Together

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Using SilkJS ORM and ExtJS Grids Together

Can SilkJS and ExtJS share models and other code?

Wow...

Awesome

hmm

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