ASP.NET DaST
DaST is a new architectural pattern for building highly dynamic Web 2.0 applications. A web page is rendered as a set of randomly nested rectangles where each rectangle is controlled individually and every combination of rectangles can be partially updated
via AJAX. DaST is designed to make web development more natural and intuitive, without complexity that other known frameworks have.
Quick overview
Find more on the NEW project site at
www.Makeitsoft.com
LATEST NEWS & EVENTS
First impression …
Here is a basic demo of simple output app with DaST. It does not do much, just outputs some customer-order-item data in the user friendly form. So, how does this app look in the DaST world?
First, we need an HTML template with 3 repeater scopes to control presentation. DaST templates contain nothing but regular HTML:
<div dast:scope="CustomerRepeater" class="indent">
<b>Customer:</b> {CustomerName}
<div dast:scope="OrderRepeater" class="indent">
<div><b>Order:</b> {OrderID}</div>
<div dast:scope="ItemRepeater" class="indent">
<div><b>Item:</b> {ItemName}</div>
</div>
</div>
</div>
Then, we need to implement a controller class with callbacks to individually control every repeater scope in the template - there are 3 callbacks for each of the scopes:
public class NonsenseExample1aController : ScopeController
{
private void DataBind_CustomerRepeater()
{
var customers = DataLayer.GetCustomers(); // get all customers
CurrPath().RepeatStart(); // zeroize repeater
foreach (var c in customers) // loop through customers
{
CurrPath().Repeat(); // repeat scope for current customer
CurrPath().Replace("{CustomerName}", c.GetValue("Name")); // bind customer name
CurrPath("OrderRepeater").Params.Set("CUST", c); // pass customer to next scope
}
}
private void DataBind_OrderRepeater()
{
var c = CurrPath().Params.Get<object>("CUST"); // customer passed in params
var orders = DataLayer.GetOrders((string)c.GetValue("Name")); // customer orders
CurrPath().RepeatStart(); // zeroize repeater
foreach (var o in orders) // loop through orders
{
CurrPath().Repeat(); // repeat scope for current order
CurrPath().Replace("{OrderID}", o.GetValue("ID")); // bind order id
CurrPath("ItemRepeater").Params.Set("Order", o); // pass order to next scope
}
}
private void DataBind_ItemRepeater()
{
var o = CurrPath().Params.Get<object>("Order"); // order passed in params
var items = DataLayer.GetOrderItems((string)o.GetValue("ID")); // order items
CurrPath().RepeatStart(); // zeroize repeater
foreach (var i in items) // loop through items
{
CurrPath().Repeat(); // repeat scope for current item
CurrPath().Replace("{ItemName}", i.GetValue("Name")); // bind item name
}
}
}
This is it! The resulting output in the web browser is like this:
This example is very basic and does simple output only. The real power of DaST pattern shows in highly dynamic and interactive Web 2.0 apps with heavy AJAX load. Please go through our
Getting Started tutorial to see all this in action.
Looking at the example above you might have one question: WHAT HAPPENED? How did it work? Where are all server controls? Where are repeaters with data binding expessions, labels, update panels, and my lovely page lifecycle events? Something’s
got to be wrong, there’s got to be catch somewhere!? … NO, there is no catch, it's just the way DaST works. And no matter how complex and dynamic your Web 2.0 page is, your controller class will essentially have the same plain
structure as the one above!
How this works?
Check out DaST technology
Quick Overview or full
Getting Started tutorial to learn more.