look up I want to put a product id in a field, the system has to return it´s description

Alejandro,

What you're looking for is AJAX. You did not describe your environment, so let me give you a couple of ideas to look into:

1) ASP.NET - Using a textbox, a label and a button enclosed in an UpdatePanel, the description can be retrieved from the server and displayed to the user. This would involve "Partial Page Updates" and would be fired by the button_click event. Pretty easy to do, and several tutorials available out there, including some at http://ajax.asp.net.

2) Utilizing jQuery and the inherent AJAX capabilities that it has. Again, the user would enter data and click the button, but rather than the processing being done on the server, jQuery and JSON would be used to bring the data back to the client and present it to the visitor. There are several good tutorials out there on jQuery as well.

If you have any further questions, please don't hesitate to ask.

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