How can I prevent the parent row handler from being called when the img is clicked?

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One way to prevent the parent row handler from being called when the img is clicked is to stop the event propagation. This can be done by adding an event listener to the img that calls the event's stopPropagation method. This will prevent the event from bubbling up to the parent row handler.

For example, in jQuery, you can add the event listener like this:

$('tr td img').click(function(event) {
  event.stopPropagation();
  // do something else
});

In pure JavaScript, you can add the event listener like this:

document.querySelectorAll('tr td img').forEach(function(img) {
  img.addEventListener('click', function(event) {
    event.stopPropagation();
    // do something else
  });
});

In both cases, the event.stopPropagation method will prevent the parent row handler from being called when the img is clicked.