The
onreadystatechange property accepts an EventListener value,
specifying the method that the object will invoke whenever the
readyState value changes.
1.3.3 The responseText Property
The responseText property contains the text of the HTTP response
received by the client. When the readyState value is 0, 1, or 2
responseText contains an empty string. When the readyState
value is 3 (Receiving), the response contains the incomplete response
4 1 What is Ajax?
received by the client. When readyState is 4 (Loaded) the
responseText contains the complete response.
1.3.4 The responseXML Property
The responseXML property represents the XML response when the
complete HTTP response has been received (when readyState is 4),
when the Content-Type header specifies the MIME (media) type as
text/xml, application/xml, or ends in +xml. If the Content-Type
header does not contain one of these media types, the responseXML
value is null. The responseXML value is also null whenever the
readyState value contains any value other than 4. The responseXML
property value is an object of type Document interface, and represents
the parsed document. If the document cannot be parsed (for example if the
document is malformed or the character encoding of the document is not
supported) the responseXML value is null.
1.3.5 The status Property
The status property represents the HTTP status code2 and is of type
short.
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