example: https://jsfiddle.net/vrtnw5xf/1/
How to implement so that for one "clamping" of the mouse button you could select from 1 to 4 cells only vertically or horizontally?
$(function() { var isMouseDown = false; $(".custom-cell").mousedown(function() { isMouseDown = true; $(this).toggleClass("custom-cell-clicked"); return false; // prevent text selection }).mouseover(function() { if (isMouseDown) { $(this).toggleClass("custom-cell-clicked"); } }).on("selectstart", function() { return false; // prevent text selection in IE }); $(document).mouseup(function() { isMouseDown = false; }); });