Question

This is rather a syntax question I am going to explain it jQuery’s ajax functionality.

Let’s say I want to control dataType of all ajax request according to url. For example url’s with parameter &parseJSON=true should have a dataType of 'JSON' automatically.

For example:

$.myajax({url:'http://example.com&parseJSON=true'})

should be equivalent to

$.ajax({url:'http://example.com&parseJSON=true', dataType: 'JSON'})

Basically, I need to check for URL and add dataType parameter if needed.

Answer 1

You can do this with an ajax prefilter:

$.ajaxPrefilter( function( options ) {
  // If datatype isn't set and the url contains our param,
  if ( !options.dataType && options.url.includes('parseJSON=true') ) {
    // return "json" to change the datatype to json
    return "json";
  }
});

This doesn’t change anything about how you use $.ajax, $.post, or $.get other than that you no longer have to specify the dataType if the url parameter is present.