Toggling the JQuery toggleClass() function to switch a class on and off (or delete it afterwards

Utilizing an angular directive to display a page with left and right columns using

<left-column></left-column>
and
<right-column></right-column>
. Whenever a user clicks on an anchor tag
<a href="#target1">Target 1</a>
, it locates the corresponding
<div id="target1">Target 1</div>
in the right column.

Everything is functioning as expected, and now the goal is to make the specific div's background flash or exhibit some visual effect upon being clicked, by toggling a CSS class. The intention is to add this class temporarily, and then remove it after a brief delay.

Attempting to achieve this using a setTimeout() function, however, it's not producing the desired outcome. Any suggestions?

The encountered error message reads:

Uncaught TypeError: Cannot read property 'toggleClass' of undefined
   

The corresponding JavaScript code snippet is as follows:

var highlight = { 
   onReady: function() {
        $(document).on('click', 'left-column > div', function(event) { 
            var id = $('a', this).attr('href').split('#'); 
            var target = $('right-column > div').find('#' + id[1]);
            target.toggleClass('gas');
            var junk = setTimeout(function(target) { 
                target.toggleClass('gas'); 
            }, 1000);
            event.preventDefault();
        });
   }
   }; 
   $(document).ready(highlight.onReady); 
   

Answer №1

The issue you are facing is due to the fact that you are expecting the variable target to be passed as an argument in the callback for setTimeout, but you are not actually passing any arguments. This causes the local target within the setTimeout callback to hide or shadow the target variable from the outer scope.

To resolve the error, you should remove target from the callback parameters:

var junk = setTimeout(function(/* remove target from here */) {
  target.toggleClass('gas');
}, 1000);

Alternatively, you can explicitly pass target as an argument, although this may be redundant since it is already available:

var junk = setTimeout(function(target) {
  target.toggleClass('gas');
}, 1000, target); // <--- you can pass the target along here

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