js实现完全自定义可带多级目录的网页鼠标右键菜单方法_javascript技巧

这是很不错的一个网页鼠标特性，这个代码可以控制网页中鼠标的右键菜单，完全按照你的意思打造，可以带多级的目录显示。
代码如下:






var getOffset = {
top: function (obj) {
return obj.offsetTop + (obj.offsetParent ? arguments.callee(obj.offsetParent) : 0)
},
left: function (obj) {
return obj.offsetLeft + (obj.offsetParent ? arguments.callee(obj.offsetParent) : 0)
}
};
window.onload = function ()
{
var oMenu = document.getElementById("rightMenu");
var aUl = oMenu.getElementsByTagName("ul");
var aLi = oMenu.getElementsByTagName("li");
var showTimer = hideTimer = null;
var i = 0;
var maxWidth = maxHeight = 0;
var aDoc = [document.documentElement.offsetWidth, document.documentElement.offsetHeight];
oMenu.style.display = "none";
for (i = 0; i < aLi.length; i++)
{
//为含有子菜单的li加上箭头
aLi[i].getElementsByTagName("ul")[0] && (aLi[i].className = "sub");
//鼠标移入
aLi[i].onmouseover = function ()
{
var oThis = this;
var oUl = oThis.getElementsByTagName("ul");
//鼠标移入样式
oThis.className += " active";
//显示子菜单
if (oUl[0])
{
clearTimeout(hideTimer);
showTimer = setTimeout(function ()
{
for (i = 0; i < oThis.parentNode.children.length; i++)
{
oThis.parentNode.children[i].getElementsByTagName("ul")[0] &&
(oThis.parentNode.children[i].getElementsByTagName("ul")[0].style.display = "none");
}
oUl[0].style.display = "block";
oUl[0].style.top = oThis.offsetTop + "px";
oUl[0].style.left = oThis.offsetWidth + "px";
setWidth(oUl[0]);
//最大显示范围
maxWidth = aDoc[0] - oUl[0].offsetWidth;
maxHeight = aDoc[1] - oUl[0].offsetHeight;
//防止溢出
maxWidth < getOffset.left(oUl[0]) && (oUl[0].style.left = -oUl[0].clientWidth + "px");
maxHeight < getOffset.top(oUl[0]) && (oUl[0].style.top = -oUl[0].clientHeight + oThis.offsetTop + oThis.clientHeight + "px")
},300);
}
};
//鼠标移出
aLi[i].onmouseout = function ()
{
var oThis = this;
var oUl = oThis.getElementsByTagName("ul");
//鼠标移出样式
oThis.className = oThis.className.replace(/\s?active/,"");
clearTimeout(showTimer);
hideTimer = setTimeout(function ()
{
for (i = 0; i < oThis.parentNode.children.length; i++)
{
oThis.parentNode.children[i].getElementsByTagName("ul")[0] &&
(oThis.parentNode.children[i].getElementsByTagName("ul")[0].style.display = "none");
}
},300);
};
}
//自定义右键菜单
document.oncontextmenu = function (event)
{
var event = event || window.event;
oMenu.style.display = "block";
oMenu.style.top = event.clientY + "px";
oMenu.style.left = event.clientX + "px";
setWidth(aUl[0]);
//最大显示范围
maxWidth = aDoc[0] - oMenu.offsetWidth;
maxHeight = aDoc[1] - oMenu.offsetHeight;
//防止菜单溢出
oMenu.offsetTop > maxHeight && (oMenu.style.top = maxHeight + "px");
oMenu.offsetLeft > maxWidth && (oMenu.style.left = maxWidth + "px");
return false;
};
//点击隐藏菜单
document.onclick = function ()
{
oMenu.style.display = "none"
};
//取li中最大的宽度, 并赋给同级所有li
function setWidth(obj)
{
maxWidth = 0;
for (i = 0; i < obj.children.length; i++)
{
var oLi = obj.children[i];
var iWidth = oLi.clientWidth - parseInt(oLi.currentStyle ? oLi.currentStyle["paddingLeft"] : getComputedStyle(oLi,null)["paddingLeft"]) * 2
if (iWidth > maxWidth) maxWidth = iWidth;
}
for (i = 0; i < obj.children.length; i++) obj.children[i].style.width = maxWidth + "px";
}
};

希望本文所述对大家的javascript程序设计有所帮助。