Checking for XML or HTML

[Shaolin]

Hi Guys

If I send off an ajax post/get request and the server returns some data, is there any way I can check what type of data has been recieved (XML or HTML)? and then use the appropriate return call (i.e. responseText or responseXML) ?

[toicontien]

Say the variable that holds the XML HTTP request object is called xhr.

if (xhr.responseXML) {
  // Is XML
} else {
  // Is not XML
}

If the response is valid XML, the responseXML property will not be null. If the response contains invalid XML, the responseXML property will be null or undefined -- some sort of value that evaluates to false.