jQuery Templates and Data Linking (and Microsoft contributing to jQuery)
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by Scott Guthrie
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Support for Client Data-Linking

The ASP.NET team recently submitted another proposal and prototype to the jQuery forums (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:

image

The following JavaScript code links the two INPUT elements above to the properties of a JavaScript “contact” object that has a “name” and “phone” property:

image

When you execute this code, the value of the first INPUT element (#name) is set to the value of the contact name property, and the value of the second INPUT element (#phone) is set to the value of the contact phone property. The properties of the contact object and the properties of the INPUT elements are also linked – so that changes to one are also reflected in the other.

Because the contact object is linked to the INPUT element, when you request the page, the values of the contact properties are displayed:

image

More interesting, the values of the linked INPUT elements will change automatically whenever you update the properties of the contact object they are linked to.

For example, we could programmatically modify the properties of the “contact” object using the jQuery attr() method like below:

image

Because our two INPUT elements are linked to the “contact” object, the INPUT element values will be updated automatically (without us having to write any code to modify the UI elements):

image

Note that we updated the contact object above using the jQuery attr() method. In order for data linking to work, you must use jQuery methods to modify the property values.


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