determining the 'top' and 'right' coordinates upon clicking

I encountered an issue with a table having a drop-down menu that was getting cut off when opened on the last line. After some experimentation, I came up with a solution to detach the drop-down menu from its parent element and then reposition it by setting the top and right values.

However, I am struggling to determine how to calculate the correct position for the drop-down menu to open just below the button that activated it.

If you want to see an example, check out this JSFiddle link.

(function() {
  var dropdownMenu;
  console.log($(window).width());
  $(window).on('show.bs.dropdown', function(e) {     
    dropdownMenu = $(e.target).find('.dropdown-menu');
    $('body').append(dropdownMenu.detach());          
    dropdownMenu.css('display', 'block');
    dropdownMenu.css('position', 'fixed');
    dropdownMenu.css('top', '440px');
    dropdownMenu.css('right', '100px')
  });                                                   
  $(window).on('hide.bs.dropdown', function(e) {        
    $(e.target).append(dropdownMenu.detach());        
    dropdownMenu.hide();                              
  });                                                   
})(); 

Note: The values of 440px and 100px should be dynamically calculated based on the position of the button that triggered the drop-down.

Answer №1

To achieve this, one method is using the getBoundingClientRect() function. By utilizing this method, you can obtain the x and y coordinates of the clicked element along with additional information. I have tested this approach on both Chrome and Firefox, confirming its compatibility across different browsers. You can find more details about browser support here.

  $(window).on('show.bs.dropdown', function(e) {     
    dropdownMenu = $(e.target).find('.dropdown-menu');
    $('body').append(dropdownMenu.detach());          
    dropdownMenu.css('display', 'block');
    dropdownMenu.css('position', 'fixed');
    var topValue = e.relatedTarget.getBoundingClientRect().y
    dropdownMenu.css('top', topValue);
    var leftValue = e.relatedTarget.getBoundingClientRect().x
    dropdownMenu.css('left', leftValue);
  });  

Take a look at this fiddle for a visual example.

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