TryXPath Method
Navigates to the specified XPath if it exists.
Syntax
rest.tryXPath(xpath, [callback])
Callback
The 'callback' parameter specifies a function which will be called when the operation completes (or an error is encountered). If the 'callback' parameter is not specified, then the method will block and will not return until the operation completes (or an error is encountered).
The callback for this method is defined as:
function(err, data){ }
'err' is the error that occurred. If there was no error, then 'err' is 'null'.
'data' is the value returned by the method.
'err' has 2 properties which hold detailed information:
err.code err.message
Remarks
This method will attempt to navigate to the specified XPath parameter if it exists within the document.
If the XPath exists the XPath property will be updated and this method returns True.
If the XPath does not exist the XPath property is not updated and this method returns False.