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Ajax-based unlimited menu 2

Source: Internet
Author: User
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First, create a data table menu

MId menu primary key
Name menu name
Url menu Link
Father low-level menu ID
Whether sub is the underlying menu (used to determine whether sub can be expanded)
Target menu Link target (as the display id when opened in ajax Mode)
Pa menu parameters (this is used to open the menu in ajax Mode)

CreateMenu object class

Class Menu {
Private int mId;
Private String name;
... // Other members

Public getMid (){
Return mId;
}
Public setMid (int mId ){
This. mId = mId;
}
... // Get set Method for other members,
}

 

 

AnotherYesoperation class

Class MenuOpt (){
Public Vector getMenus (int father ){
Vector vector = new Vector ();
// Obtain all the menus whose parent menu ID is father.
// And encapsulate it in an object of the Vector ..
Return vector;
}
}

The second is the general JSP file. However, do not include the <HTML> <body> tag!
Menu. jsp:

<% @ Page contenttype = "text/html; charset = gb2312" %>
<% @ Taglib uri = "http://java.sun.com/jsp/jstl/core" prefix = "C" %>
<! -- The label definition of jstl is used earlier. (It is strongly recommended to learn JSP !) -->
<JSP: usebean id = "menu" Scope = "page" class = "ycoe. Basic. menuopt"/>
<JSP: setproperty name = "menu" property = "father" value = "$ {Param. Father}"/>
<Div>
<C: foreach Var = "M" items = "$ {menu. Vector}" varstatus = "C">
<C: Choose>
<C: When test = "$ {M. sub EQ 'y'}">
<Div onclick = "showmenu('{}m.mid}', '{}m.url}', '{}m.tar get} ', 'Father =$ {M. Mid}')">

<A href = "#" class = "text1" >$ {M. name} </a>
</Div>
<Div style = "display: none;" id = "tr $ {m. mid}">
<Div style = "padding-left: 12pt" id = "$ {m. mid}"> </div>
</Div>
</C: when>
<C: otherwise>
<Div onclick = "openmenu('{}m.url}', '{}m.tar get} ',' $ {m. pa} ');">

<A href = "#" class = "text1" >$ {m. name} </a>
</Div>
</C: otherwise>
</C: choose>
</C: forEach>
</Div>

Menu. js:

// OperMenu (open the drop-down menu ID, open address, link to open the target, parameters ).
// This is the method used in menu. jsp
Function showMenu (id, url, target, param ){
Var trObj = document. getElementById ("tr" + id );
Var tdObj = document. getElementById (id );
// Try {
If (document. getElementById ("tr" + id). style. display = "none "){
// Display menu
If (tdObj. innerHTML = null | tdObj. innerHTML = ""){
// Extract data
Document. getElementById ("tr" + id). style. display = "";
Document. getElementById ("img" + id). src = "pic/menu2.gif"
Bcandy (id, "page/menu. jsp", param ,"");
OpenMenu (url, target, param );
} Else {
// If there is content in it, it is displayed directly
Document. getElementById ("tr" + id). style. display = "";
Document. getElementById ("img" + id). src = "pic/menu2.gif"
OpenMenu (url, target, param );
}
// Bcandy (target, url, param, ""); // open the menu Link
} Else {
// Hide the menu
Document. getElementById ("tr" + id). style. display = "none ";
Document. getElementById ("img" + id). src = "pic/menu0.gif"
}
//} Catch (e ){}
}

// Open the menu
Function openMenu (url, target, param ){
// Do not write it here. There are several implementation methods. We recommend using ajax!
}

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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