試行位置: 固定; 次の条件に基づいてコンテキストメニューの位置が変わります -
var windowHeight = $(window).height()/2;
var windowWidth = $(window).width()/2;
if(e.clientY > windowHeight && e.clientX <= windowWidth) {
$("#contextMenuContainer").css("left", e.clientX);
$("#contextMenuContainer").css("bottom", $(window).height()-e.clientY);
$("#contextMenuContainer").css("right", "auto");
$("#contextMenuContainer").css("top", "auto");
} else if(e.clientY > windowHeight && e.clientX > windowWidth) {
$("#contextMenuContainer").css("right", $(window).width()-e.clientX);
$("#contextMenuContainer").css("bottom", $(window).height()-e.clientY);
$("#contextMenuContainer").css("left", "auto");
$("#contextMenuContainer").css("top", "auto");
} else if(e.clientY <= windowHeight && e.clientX <= windowWidth) {
$("#contextMenuContainer").css("left", e.clientX);
$("#contextMenuContainer").css("top", e.clientY);
$("#contextMenuContainer").css("right", "auto");
$("#contextMenuContainer").css("bottom", "auto");
} else {
$("#contextMenuContainer").css("right", $(window).width()-e.clientX);
$("#contextMenuContainer").css("top", e.clientY);
$("#contextMenuContainer").css("left", "auto");
$("#contextMenuContainer").css("bottom", "auto");
}
http://jsfiddle.net/AkshayBandivadekar/zakn7Lwb/14/