jQuery模板技术和数据绑定实现代码


好消息来了,微软开发出了这样的框架,这是对jQuery的一个扩展,从此以后要在浏览器上动态显示服务器端Web Service返回的数据将变得如同用服务器端控件显示数据一样容易。

这个技术就叫jQuery templates and data linking ,这是微软对jQuery做的一个扩展。这种扩展需要jQuery官方的审核,然后才能被包含在jQuery中。据ScottGu的博客上说,此扩展正在等待审核阶段。但是这些功能却是非常强大而且实用,我就先把它转过来了,先睹为快。

在编写AJAX应用时,经常需要利用JavaScript在页面上显示数据,jQuery模板(jQuery Templates)和数据绑定(Data Linking)提供了一种方便的途径将JavaScript数据显示在HTML页面上,数据可以呈现为各种元素,如普通文本、TextBox、列表等。Data Linking这个单词直译应该作数据链接,但是我觉得数据绑定这个词更加能够反映这种技术的能容,而且符合ASP.NET习惯用法。在Scott Guthrie的博客中也这样说,原来他们也想称这种技术为data binding而不是data linking,但是由于jQuery中已经有binding这个术语了,指的是另外的东西,为了不至于引起混淆,所以就只好另外给它起个名字,叫data linking了。

我下面把这个博客转过来,有时间则翻译一下。

以下全文引用自ScottGu的博客。

jQuery Templates and Data Linking (and Microsoft contributing to jQuery)

The jQuery library has a passionate community of developers, and it is now the most widely used JavaScript library on the web today.

Two years ago I announced that Microsoft would begin offering product support for jQuery, and that we'd be including it in new versions of Visual Studio going forward. By default, when you create new ASP.NET Web Forms and ASP.NET MVC projects with VS 2010 you'll find jQuery automatically added to your project.

A few weeks ago during my second keynote at the MIX 2010 conference I announced that Microsoft would also begin contributing to the jQuery project. During the talk, John Resig -- the creator of the jQuery library and leader of the jQuery developer team – talked a little about our participation and discussed an early prototype of a new client templating API for jQuery.

In this blog post, I'm going to talk a little about how my team is starting to contribute to the jQuery project, and discuss some of the specific features that we are working on such as client-side templating and data linking (data-binding).

Contributing to jQuery

jQuery has a fantastic developer community, and a very open way to propose suggestions and make contributions. Microsoft is following the same process to contribute to jQuery as any other member of the community.

As an example, when working with the jQuery community to improve support for templating to jQuery my team followed the following steps:

  1. We created a proposal for templating and posted the proposal to the jQuery developer forum (http://forum.jquery.com/topic/jquery-templates-proposal and http://forum.jquery.com/topic/templating-syntax ).
  2. After receiving feedback on the forums, the jQuery team created a prototype for templating and posted the prototype at the Github code repository (http://github.com/jquery/jquery-tmpl ).
  3. We iterated on the prototype, creating a new fork on Github of the templating prototype, to suggest design improvements. Several other members of the community also provided design feedback by forking the templating code.

There has been an amazing amount of participation by the jQuery community in response to the original templating proposal (over 100 posts in the jQuery forum), and the design of the templating proposal has evolved significantly based on community feedback.

The jQuery team is the ultimate determiner on what happens with the templating proposal – they might include it in jQuery core, or make it an official plugin, or reject it entirely. My team is excited to be able to participate in the open source process, and make suggestions and contributions the same way as any other member of the community.

jQuery Template Support

Client-side templates enable jQuery developers to easily generate and render HTML UI on the client. Templates support a simple syntax that enables either developers or designers to declaratively specify the HTML they want to generate. Developers can then programmatically invoke the templates on the client, and pass JavaScript objects to them to make the content rendered completely data driven. These JavaScript objects can optionally be based on data retrieved from a server.

Because the jQuery templating proposal is still evolving in response to community feedback, the final version might look very different than the version below. This blog post gives you a sense of how you can try out and use templating as it exists today (you can download the prototype by the jQuery core team at http://github.com/jquery/jquery-tmpl or the latest submission from my team at http://github.com/nje/jquery-tmpl).

jQuery Client Templates

You create client-side jQuery templates by embedding content within a <script type="text/html"> tag. For example, the HTML below contains a <div> template container, as well as a client-side jQuery “contactTemplate” template (within the <script type="text/html"> element) that can be used to dynamically display a list of contacts:

http://forum.jquery.com/topic/proposal-for-adding-data-linking-to-jquery). This proposal describes a new feature named data linking. Data Linking enables you to link a property of one object to a property of another object - so that when one property changes the other property changes. Data linking enables you to easily keep your UI and data objects synchronized within a page.

If you are familiar with the concept of data-binding then you will be familiar with data linking (in the proposal, we call the feature data linking because jQuery already includes a bind() method that has nothing to do with data-binding).

Imagine, for example, that you have a page with the following HTML <input> elements:

download this .zip file to get with working code examples of the above scenarios. The .zip file includes 4 static HTML page:

  • Listing1_Templating.htm – Illustrates basic templating.
  • Listing2_TemplatingConditionals.htm – Illustrates templating with the use of the if and each template commands.
  • Listing3_DataLinking.htm – Illustrates data linking.
  • Listing4_Converters.htm – Illustrates using a converter with data linking.

You can un-zip the file to the file-system and then run each page to see the concepts in action.

Summary

We are excited to be able to begin participating within the open-source jQuery project. We've received lots of encouraging feedback in response to our first two proposals, and we will continue to actively contribute going forward. These features will hopefully make it easier for all developers (including ASP.NET developers) to build great Ajax applications.

Hope this helps,
jQuery 模板和数据绑定演示代码



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