May 2017
Intermediate to advanced
448 pages
10h 10m
English
Content preview from Learning jQuery 3 - Fifth Edition
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Using the jqXHR object
When an Ajax request is made, jQuery determines the best mechanism available for retrieving the data. This transport could be the standard XMLHttpRequest object, the Microsoft ActiveX XMLHTTP object, or a <script> tag.
Because the transport used can vary from request to request, we need a common interface in order to interact with the communication. The jqXHR object provides this interface for us. It is a wrapper for the XMLHttpRequest object when that transport is used, and in other cases, it simulates XMLHttpRequest as best it can. Among the properties and methods it exposes are:
- .responseText or .responseXML, containing the returned data
- .status and .statusText, containing a status code and description
- .setRequestHeader() ...
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