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contentType is the type of data you're sending, so application/json; charset=utf-8 is a common one, as is application/x-www-form-urlencoded; charset=UTF-8 , which is the default. dataType is what you're expecting back from the server: json , html , text , etc.
dataType is you telling jQuery what kind of response to expect. Expecting JSON, or XML, or HTML, etc. The default is for jQuery to try and figure it out.
contentType option to false is used for multipart/form-data forms that pass files. When one sets the contentType option to false , it forces jQuery not to add a Content-Type header, otherwise, the boundary string will be missing from it.
$. post is a shorthand way of using $. ajax for POST requests, so there isn't a great deal of difference between using the two - they are both made possible using the same underlying code.
From the documentation:
contentType (default: 'application/x-www-form-urlencoded; charset=UTF-8')
Type: String
When sending data to the server, use this content type. Default is "application/x-www-form-urlencoded; charset=UTF-8", which is fine for most cases. If you explicitly pass in a content-type to $.ajax(), then it'll always be sent to the server (even if no data is sent). If no charset is specified, data will be transmitted to the server using the server's default charset; you must decode this appropriately on the server side.
and:
dataType (default: Intelligent Guess (xml, json, script, or html))
Type: String
The type of data that you're expecting back from the server. If none is specified, jQuery will try to infer it based on the MIME type of the response (an XML MIME type will yield XML, in 1.4 JSON will yield a JavaScript object, in 1.4 script will execute the script, and anything else will be returned as a string).
They're essentially the opposite of what you thought they were.
In English:
ContentType: When sending data to the server, use this content type. Default is application/x-www-form-urlencoded; charset=UTF-8, which is fine for most cases.Accepts: The content type sent in the request header that tells the server what kind of response it will accept in return. Depends on DataType.DataType: The type of data that you're expecting back from the server. If none is specified, jQuery will try to infer it based on the MIME type of the response. Can be text, xml, html, script, json, jsonp.If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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