CSS JavaScript implements menu function improved version_navigation menu

The improved version optimizes this problem and allows you to add menus through simple Javascript code. At the same time, it makes the HTML page very concise, only needing to write 2 lines of code! O(∩_∩)O
1. The prerequisite is to introduce a CSS file and a JavaScript file into the HTML page. As follows:

Copy code The code is as follows:

Introduce CSS file: , see menu.css code below
Introduce JavaScript file:
2. Definition The menu code is as follows:

Copy code The code is as follows:

if (document.getElementById){
var root = new Root();

var m1 = new Menu("File","alert(this.innerText);");
root.add(m1);
var m11 = new MenuItem("New");
m1.add(m11);
m1.add(new MenuItem("Open","alert('open file');"));
var m12 = new MenuItem("Save");
m1.add(m12);
m1.add(new MenuItem("Save As"));
m1.add(new MenuItem(" Close"));
m1.add(new MenuItem(""));

var m2 = new Menu("Edit");
root.add(m2);

root.toString();
}

Note:
1) var root = new Root();
root.toString();
Fixed Format
2) Declare the menu:
var m1 = new Menu("File","alert(this.innerText);");
The name displayed by the menu is "File", and the onclick event is alert( this.innerText);
root.add(m1);
The first-level menu (that is, the menu initially displayed on the page) is placed under root, and through the add() method
var m11 = new MenuItem( "New"");
m1.add(m11);
Declare the submenu "New" of "File"
m1.add(new MenuItem("Open","alert('open file' );"));
Declare the submenu "Open" of "File"
The menu addition function can be completed through the above code.
Code file:
<1> menu.css

Copy code The code is as follows:

#menubar {
font-family:verdana;
font-size:12px;
margin:1px;
}
#menubar li {
float:left;
position:relative;
text-align:left;
}
/* each menu item style */
#menubar li a {
border-style:none;
color:black;
display:block;
width:150px;
height:20px;
line-height:20px;
padding-left:10px;
text-decoration :none;
}
/* the first level menu which displays default */
#menubar .menuMain{
border-color:#C0C0C0;
border-width:1px;
border-style:solid;
}
/* the first leve style when mouse on it */
#menubar li a:hover{
background-color:#efefef;
text -decoration:underline;
}
/* the second level menu block style */
#menubar li ul{
background-color:#efefef;
border-style:none;
display:none;
position:absolute;
top:20px;
left:-40px;
margin-top:2px;
width:150px;
}
/* the sub menu item style when mouse on it */
#menubar li ul li a:hover {
text-decoration:underline;
padding-left:20px;
}
/* the third or more level menu block style */
#menubar li ul li ul {
display:none;
position:absolute;
top:0px;
left:150px ;
margin-top:0;
margin-left:0;
width:150px;
}

<2>menu.js

Copy code The code is as follows:

var MenuConfig = {
defaultText : "메뉴 항목",
defaultAction : "javascript:void(0);" ,
defaultMenuCssStyle : "menuMain"
};

var MenuHandler = {
idCounter : 0,
idPrefix : "menu-",
getId : function(){ return this.idPrefix this.idCounter ;},
insertHTMLBeforeEnd : function(node, sHTML){
if(node.insertAdjacentHTML != null){
node.insertAdjacentHTML('BeforeEnd',sHTML);
반환;
}
var df; // DocumentFragment
var r = node.ownerDocument.createRange();
r.selectNodeContents(노드);
r.collapse(false);
df = r.createContextualFragment(sHTML);
node.appendChild(df);
}
}

function displaySubMenu(li){
var subMenu = li.getElementsByTagName('ul')[0];
if(subMenu)
subMenu.style.display = '차단';
}

function hideSubMenu(li){
var subMenu = li.getElementsByTagName('ul')[0];
if(subMenu)
subMenu.style.display = '없음';
}


/******************************************
* 기능 이름: MenuAbstractNode
* 설명： MenuAbstractNode 클래스
* @param {String} pText
* @param {String} pAction
* @Return：
************** *****************************/
function MenuAbstractNode(pText, pAction){
this.text = pText || MenuConfig.defaultText;
this.action = pAction || MenuConfig.defaultAction;
this.id = MenuHandler.getId();

this.childNodes = [];
}

MenuAbstractNode.prototype.add = function(node){
this.childNodes[this.childNodes.length] = node;
}

/******************************************
* 기능 이름: toString
* 설명： HTML 코드 생성
* @param
* @param
* @Return：
************************ **********************/
MenuAbstractNode.prototype.toString = function(){
var str = "

if(this.type=="메뉴"){
str = str " class="" this.cssStyle """;
}
str = str " onclick="" this.action "">" this.text "";

var sb = [];

for (var i = 0; i < this.childNodes.length; i ) {
sb[i] = this.childNodes[i].toString();
}
if(sb.length>0){
str = str "

" sb.join("") "

"
}

return str "

" ;
}

/******************************************
* 기능명 : 메뉴
* 설명： 메뉴 클래스
* @param {String} pText
* @param {String} pAction
* @param {String} pCssStyle
* @Return：
**** ***************************************/
기능 메뉴(pText, pAction,pCssStyle){
this.base = MenuAbstractNode;
this.base(pText,pAction);

this.type = "메뉴";
this.cssStyle = pCssStyle || MenuConfig.defaultMenuCssStyle;
}

Menu.prototype = new MenuAbstractNode;

/******************************************
* 기능 이름: MenuItem
* 설명： MenuItem 클래스
* @param {String} pText
* @param {String} pAction
* @Return：
**************** *****************************/
function MenuItem(pText, pAction){
this.base = MenuAbstractNode;
this.base(pText,pAction);
this.type = "메뉴항목";
}

MenuItem.prototype = new MenuAbstractNode;


/******************************************
* 기능 이름: 루트
* 설명： 루트 클래스
* @Return：
********************************** *********/
function Root(){
this.id = "menubar";
this.childNodes=[];
}

Root.prototype = new MenuAbstractNode;

Root.prototype.toString = function(){
document.write("

< /ul>

");
for(var i=0; iMenuHandler.insertHTMLBeforeEnd(document.getElementById(root.id), this.childNodes[i].toString());
}
}

if (document.getElementById){
var root = new Root();

var m1 = new Menu("파일","alert(this.innerText);");
root.add(m1);
var m11 = new MenuItem("New","alert(this.innerText);");
m1.add(m11);
m1.add(new MenuItem("열기","alert('파일 열기');"));
var m12 = new MenuItem("저장");
m1.add(m12);
m1.add(new MenuItem("다른 이름으로 저장"));
m1.add(new MenuItem("닫기"));
m1.add(new MenuItem(""));

var m2 = new Menu("편집");
root.add(m2);
var m22 = new MenuItem("모두 선택");
m2.add(m22);
m2.add(new MenuItem("잘라내기"));
m2.add(new MenuItem("복사"));
m2.add(new MenuItem("붙여넣기"));

var m3 = new Menu("보기");
var m33 = new MenuItem("목록 보기");
m33.add(new MenuItem("함수 목록"));
m3.add(m33);
m3.add(new MenuItem("도구 모음"));
root.add(m3);
root.toString();
}