Asp net ajax 4.0 downloads

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Microservices Create independently deployable microservices that run on Docker containers. What is ASP. Learn ASP. NET has to offer with our tutorials, video courses, and docs. Learn to use ASP. Fast and scalable ASP. Encoding is harder than it seems because you might need different encoding algorithms depending whether you're injecting a text attribute, a URL attribute, or a text node. A template engine also needs an expression language; while it is easy to inject plain data fields without modifications, this is only the simplest scenario.

Often, you'll need to apply a format string, combine multiple fields and more generally manipulate the data before displaying it. This could be achieved by transforming the data before feeding it into the template, but it is easier and more efficient if that ability is built into the template engine. Once you start adding features such as formatting, you very quickly find you need the flexibility of a full expression language. Again, this scenario requires a full language to be really useful.

Finally, HTML is only half of the story. Once you've generated HTML, you still have to hook events to elements and attach controls and behaviors. You can do that through code after the HTML generation, but this creates an unpleasant dissymmetry between the HTML, which becomes very easy, and the logic, which becomes more difficult and requires knowledge of the template's structure. In other words, in order to attach behavior, you need to know where to attach it, which in turn means that any change in the structure of the HTML template markup will require changes in the code that activates it.

There are ways to make that coupling looser but an even nicer solution would be to make content activation part of the template engine. At first, this looks like a bad option for several reasons. Sure, it has the advantage of being agreeable to standards zealots, but for some strange reason it's a lot slower than innerHTML.

But the main reason this is not commonly used is that the DOM APIs are not very expressive, and the resulting code is hard to read and harder to maintain—at least without any help and additional abstractions. There are toolkits such as jQuery that provide excellent abstractions and make the whole process a lot more fun, but even with such tools, it's harder than it needs to be which is why even jQuery has several template plug-ins.

Some of you may know that Microsoft already had a template engine in ASP. The good thing about this failed first attempt is that we learned a lot about what we didn't want the new version to be that is, slow and complex. The dev team tested many different designs for a new template engine for ASP. We also compared them in terms of what scenarios they prevented from happening.

There is no ideal solution, but we chose the one that seemed like the better compromise. That looks simple enough and it is well, until browser quirks appear. We do pay a performance penalty for using the DOM APIs, but if we're careful and build elements outside of the DOM, and add as few as possible as late as possible, the performance hit is not too big and the amazing flexibility it creates is well worth the trade-offs. All the problems in the string concatenation approach seem to go away naturally.

Injection attacks take care of themselves. As I'm using code to create text nodes and set attribute values, there is no need for encoding because the APIs I use are already safe.

Nobody in his right mind does the latter anymore so why would you want to take a similar risk here? Now who needs a new expression language? We already have one: JavaScript. When you transform the template markup into JavaScript code, what could be easier than injecting JavaScript expressions into that code you're generating?

You can inject behavior into the template in two ways. Or you can use the declarative syntax we're providing. For example, if you want to add an autocomplete and a watermark behavior to an input tag, you'd write something like this:. This will enable me to extend the XHTML markup in a standard way, and it is similar to Register directives for server code.

The part after "xmlns:" is the prefix that is going to be associated with each behavior or control. The URL for the namespace is using the "javascript:" protocol to map the prefix to a specific JavaScript type. The "sys" namespace is a special system namespace that should be mapped to the Sys namespace, which is the root namespace in AJAX. The instantiation itself is done through the special attribute sys:attach, whose value is a comma-delimited list of the prefixes of the behaviors or controls to instantiate and attach to the element.

Then I can set properties for all of these behaviors without risking a conflict with regular HTML attributes or other behaviors on the same element because they are nicely differentiated by namespace. One of the most elegant features of the engine is that the compilation of the template into JavaScript code really is analogous to a real compilation step.

This means that it only has to happen once per template and that provides the opportunity to execute a number of tasks ahead of time instead of doing them each time the template is instantiated.

But that's enough theory for now. The item template is a list item with a simple link in it. The class "sys-template" is defined in the CSS for the page to hide the template from the initial rendering of the page.

The compiled code for this simple template is shown in Figure 7. The details view is a little more complex and actually contains some inline code see Figure 8. I could have used a nested template to render the list of photos, but it is a little simpler to use a regular loop over the markup for one photo.

A nested template would have been justified if I were dealing with dynamically changing data and automatic reflection of the changes into the markup which is a supported scenario, but outside of the scope of this article , but seeing that I'm dealing with one-way, one-time bindings here, inline code is fine.

The templates are lazily compiled the first time they are instantiated but they are prepared by creating a "new Sys. Template" using the parent element of the template markup as the parameter of the constructor. The templates themselves are instantiated from the callback from the network call that brings the data back from the Web service on the server:.

This will not be necessary in the shipping version of ASP. Most of the code in this app will eventually go away, but it is useful in showing how things happen under the hood.

It also shows how a component developer who wishes to include template rendering might use the feature. Where do I put the code that displays the right details view when a user clicks on one of the products? The code, like its server-side equivalent, uses event bubbling, so I was able to write one single- click event handler for all the links in the list so I could add or remove links to the list if I wanted to without having to worry about creating new handlers or cleaning up the old ones.

The following code shows that handler. All click events for the links in the list will bubble up to the list itself and be handled there. Once that is done, the event's default action the link navigation is canceled and the event is prevented from bubbling up further. This is done by calling the W3C standard stopPropagation and preventDefault methods on the event object, which the framework makes available on all browsers, including Internet Explorer.

The only feature that remains to be reproduced from the server-side version is history. Enabling history on the ScriptManager control also enables client-side APIs that are exactly analogous to the server-side APIs I've used before and that can even be used at the same time enabling mixed client-server state management. Creating history points is done by calling Sys. Learn more. Asked 11 years ago. Active 11 years ago. Viewed 2k times.

Add a comment. Active Oldest Votes. Community Bot 1 1 1 silver badge. How do i set up vs to have an ajax enabled web app and where do you get all the js script libraries from — ONYX. Ok, download this: ajaxcontroltoolkit. Download the Ajax Control Toolkit from www.

Sleette Sleette 3 3 silver badges 12 12 bronze badges. It's not the control tool kit I need that doens't setup my web application to be ajaxed that just gives me the controls — ONYX.