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Ajax example: change custom field asynchronous


Could any body help me recomending me a tutorial step by step of how to update an element using AJAX?
It could be just a simple Textfield, but I wanted to know how to update some element without upload all the page. 

thank you very much,
Best Answer chosen by Knet15
I found the solution in the following website:

In such cases we must use the property re-render which allow us to load just some part of the code and not the overall page.