jQuery.get() 4.0 backward compatibility issue

[hugodevreugd]

The jQuery api describes jQuery.get as: jQuery.get( url [, data ] [, success ] [, dataType ] )].

In jQuery 3.5.7 this code, with null for the data parameter, works:

var jqxhr = $.get( "example.php", null, function() {
  alert( "success" );
});

In jQuery 4.0 this code doesn't work anymore, you have to remove the null parameter:

var jqxhr = $.get( "example.php", function() {
  alert( "success" );
});

A small change, but this breaks backward compatibility.

[dmethvin]

The docs don't say that you can use null for data, it's supposed to be an object or string. According to #5139 (comment) and the docs, null is used to omit the callback. The second example omits data without needing to mention it at all. Worth a mention in the upgrade guide though I guess?

[timmywil]

Thanks for the issue and thanks for pointing that out, Dave. We'll mention it in the upgrade guide.

[rexfactor]

Has anyone here come across this error when using $.get() ? Also, I was using the hosted library served up by Google when I first got the message so I then loaded a local file of 3.6.

jquery-3.6.0.min.js:2 Uncaught TypeError: t.call is not a function
at Function.each (jquery-3.6.0.min.js:2:3003)
at S.fn.init.each (jquery-3.6.0.min.js:2:1481)
at Object.success ((index):21:15)
at c (jquery-3.6.0.min.js:2:28327)
at Object.fireWith [as resolveWith] (jquery-3.6.0.min.js:2:29072)
at l (jquery-3.6.0.min.js:2:79901)
at XMLHttpRequest. (jquery-3.6.0.min.js:2:82355)

NOTE: I was testing using localhost when I got this error