jQuery-UI - "Cannot read property 'step' of undefined"

Question

We've recently upgraded jQuery from version 2.2.4 to 3.1.1 and are now seeing some interesting errors. I installed the jquery-migrate plugin which helped me through a few errors, but not all. Below is the error I'm seeing in my developer console in Chrome and I can't seem to pin point where this error is occurring.

jquery-ui-1.12.1.js:1951 Uncaught TypeError: Cannot read property 'step' of undefined
    at String. (jquery-ui-1.12.1.js:1951)
    at each (jquery-3.1.1.slim.js:368)
    at Function.color.hook (jquery-ui-1.12.1.js:1913)
    at jquery-ui-1.12.1.js:1963
    at jquery-ui-1.12.1.js:2005
    at jquery-ui-1.12.1.js:14
    at jquery-ui-1.12.1.js:16

I've debugged in Chrome and it breaks inside of a function called jQuery.fx.step[ hook ]. When I hover over jQuery.fx, it's shown as undefined. See below

jQuery.fx.step[ hook ] = function( fx ) {
            if ( !fx.colorInit ) {
                fx.start = color( fx.elem, hook );
                fx.end = color( fx.end );
                fx.colorInit = true;
            }

I've uninstalled jquery-ui, but all that did was break Angular. Would love if someone could shed some light on the matter.

packages.config =

Brett DeWoody · Accepted Answer

Based on the error message it looks like you're using jQuery Slim (from at each (jquery-3.1.1.slim.js:368)). Slim removes some functions required in jQuery UI apparently. To fix this, use the full version of jQuery.

Here's a demo replicating your issue:

$( function() {
    // run the currently selected effect
    function runEffect() {
      // get effect type from
      var selectedEffect = $( "#effectTypes" ).val();
 
      // Most effect types need no options passed by default
      var options = {};
      // some effects have required parameters
      if ( selectedEffect === "scale" ) {
        options = { percent: 50 };
      } else if ( selectedEffect === "transfer" ) {
        options = { to: "#button", className: "ui-effects-transfer" };
      } else if ( selectedEffect === "size" ) {
        options = { to: { width: 200, height: 60 } };
      }
 
      // Run the effect
      $( "#effect" ).effect( selectedEffect, options, 500, callback );
    };
 
    // Callback function to bring a hidden box back
    function callback() {
      setTimeout(function() {
        $( "#effect" ).removeAttr( "style" ).hide().fadeIn();
      }, 1000 );
    };
 
    // Set effect from select menu value
    $( "#button" ).on( "click", function() {
      runEffect();
      return false;
    });
  } );

.toggler { width: 500px; height: 200px; position: relative; }
    #button { padding: .5em 1em; text-decoration: none; }
    #effect { width: 240px; height: 170px; padding: 0.4em; position: relative; }
    #effect h3 { margin: 0; padding: 0.4em; text-align: center; }
    .ui-effects-transfer { border: 2px dotted gray; }






  
    Effect
    
      Etiam libero neque, luctus a, eleifend nec, semper at, lorem. Sed pede. Nulla lorem metus, adipiscing ut, luctus sed, hendrerit vitae, mi.

And here it is with full jQuery:

$( function() {
    // run the currently selected effect
    function runEffect() {
      // get effect type from
      var selectedEffect = $( "#effectTypes" ).val();
 
      // Most effect types need no options passed by default
      var options = {};
      // some effects have required parameters
      if ( selectedEffect === "scale" ) {
        options = { percent: 50 };
      } else if ( selectedEffect === "transfer" ) {
        options = { to: "#button", className: "ui-effects-transfer" };
      } else if ( selectedEffect === "size" ) {
        options = { to: { width: 200, height: 60 } };
      }
 
      // Run the effect
      $( "#effect" ).effect( selectedEffect, options, 500, callback );
    };
 
    // Callback function to bring a hidden box back
    function callback() {
      setTimeout(function() {
        $( "#effect" ).removeAttr( "style" ).hide().fadeIn();
      }, 1000 );
    };
 
    // Set effect from select menu value
    $( "#button" ).on( "click", function() {
      runEffect();
      return false;
    });
  } );

.toggler { width: 500px; height: 200px; position: relative; }
    #button { padding: .5em 1em; text-decoration: none; }
    #effect { width: 240px; height: 170px; padding: 0.4em; position: relative; }
    #effect h3 { margin: 0; padding: 0.4em; text-align: center; }
    .ui-effects-transfer { border: 2px dotted gray; }






  
    Effect
    
      Etiam libero neque, luctus a, eleifend nec, semper at, lorem. Sed pede. Nulla lorem metus, adipiscing ut, luctus sed, hendrerit vitae, mi.

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