java中怎么实现多个下拉菜单的动态关联？

2023-02-19 20:30:02Python012

java中怎么实现多个下拉菜单的动态关联？,第1张

1，所谓级联下拉菜单就是动态的下拉菜单，

当第一级选中某一个选项是，

第二级会跟着第一级的变化而变化，

比如：当“学院”这一栏选择“信息学院”那么“专业”这一栏只会出现属于信息学院的专业。

2，级联下拉菜单的实现是运用itemStateChanged(ItemEvent

)方法实现，首先在下拉菜单上注册ItemListener监视器，当下拉菜单选中时触发itemStateChanged(ItemEvent

)事件重新给下一级下拉菜单赋值。

public

void

itemStateChanged(ItemEvent

{

if(e.getSource()

xueyuan)

{

当点击学院下拉框时

try

{

Statement

stat2

con.createStatement()

String

sql

"select

D_ID

from

xueyuanin

WHERE

D_NAME='"+e.getItem()+"'"

获取该学院的代号

ResultSet

stat2.executeQuery(sql)

rs.next()

1。sevice层：

/**

* 构建点取筛取树形动态菜单

* @return tree

* @throws BasicException

public String buildTree()throws BasicException{

try {

StringBuffer xmlBuffer = new StringBuffer()

int a = 0

xmlBuffer.append("d.add(0,-1,'<input type=\"checkbox\" name=\"ckb\" id=\"0\" onClick=\"check(this.form.ckb)\" value=\"-1\"/>全部')")

xmlBuffer.append("\n")

List list = getDao().findFundInvestType()

if(list!=null&&list.size()!=0){

int b = 0

for(int i=0i<list.size()i++){

FundInvestType bean = (FundInvestType)list.get(i)

String code = bean.getInvestCode()

// if is sencond

if(code.length()==2){

b++

a=i

xmlBuffer.append("d.add("+b+",0,'<input type=\"checkbox\" name=\"ckb\" id=\"0"+b+"\" onClick=\"selectAll(this.form.ckb,this.id)\" value=\""+bean.getInvestCode()+"\" /><b>"+bean.getInvestName()+"</b>','')")

xmlBuffer.append("\n")

}else if(code.length()==10){

//if is second

if(code.substring(2,10).equals("00000000")){

b++

a=i

xmlBuffer.append("\n")

}else{//if is third,it father is second

b++

int k = a+1

xmlBuffer.append("d.add("+b+","+k+",'<input type=\"checkbox\" name=\"ckb\" id=\"ckb0"+k+"\" value=\""+bean.getInvestCode()+"\"/>"+bean.getInvestName()+"','')")

xmlBuffer.append("\n")

}

return xmlBuffer.toString()

} catch (RuntimeException e) {

throw new BasicException(e.getMessage())

}

2。jsp页面：

<%@ page contentType="text/htmlcharset=utf-8" language="java" import="java.sql.*" errorPage="" %>

String webapp=request.getContextPath()+"/fund"

<html >

<head>

<title>基金投资类型</title>

<!-- Begin

var checkflag = "false"

function check(field) {

if (checkflag == "false") {

for (i = 1i <field.lengthi++) {

field[i].checked = true

field[i].disabled = true

}

checkflag = "true"

}else {

for (i = 1i <field.lengthi++) {

field[i].checked = false

field[i].disabled=false

}

checkflag = "false"

}

//------选中二级全选--------

var selectflag = "false"

function selectAll(field,j) {

if (selectflag == "false") {

for (i = 0i <field.lengthi++) {

var b ="ckb"+j

if(field[i].id==b){

field[i].checked = true

field[i].disabled=true

selectflag = "true"

}

}else {

for (i = 0i <field.lengthi++) {

var b ="ckb"+j

if(field[i].id==b||field[i].id==j){

field[i].checked = false

field[i].disabled = false

selectflag = "false"

}

//--------取消二级全选-------

function disabledAll(){

field = document.getElementById("myform")

for (i = 0i <field.lengthi++) {

if(field[i].checked == true){

field[i].disabled = true

checkflag = "false"

selectflag = "false"

}

//------取消选取--------

function cancelAll(field){

//field = myform.all

field = document.getElementById("myform")

for (i = 0i <field.lengthi++) {

field[i].checked = false

field[i].disabled=false

checkflag = "false"

selectflag = "false"

}

//单击提交页面

function onSubit(){

var txt = ""

//field = myform.all

field = document.getElementById("myform")

for (i = 0i <field.lengthi++) {

if(field[i].checked == true&&field[i].disabled==false){

txt += field[i].value+"."

}

//alert("=="+txt)

//取得父窗口对象

var winOpen=window.opener

winOpen.document.form.fundtype.value=txt

window.close()

}

// End -->

</script>

</head>

<tr>

<tr>

<td>基金投资类型</td>

</tr>

<tr>

<td>

<!--//

d = new dTree('d')

${tree}

document.write(d)

//-->

</script>

</div>

</td>

</tr>

</table></td>

</tr>

<td width="86" height="0"align="center"><a href="#" onClick="onSubit()"><img src="<%=webapp%>/img/btn_sure.gif" width="51" height="21" border="0"></a></td>

<td width="144" height="0"><a href="#" onClick="cancelAll()"><img src="<%=webapp%>/img/btn_cancel.gif" width="51" height="21" border="0"></a></td>

</tr>

</table>

</form>

</body>

</html>

3。js文件：

// Node object

function Node(id, pid, name, url, title, target, icon, iconOpen, open) {

this.id = id

this.pid = pid

this.name = name

this.url = url

this.title = title

this.target = target

this.icon = icon

this.iconOpen = iconOpen

this._io = open || false

this._is = false

this._ls = false

this._hc = false

this._ai = 0

this._p

}

// Tree object

function dTree(objName) {

this.config = {

target : null,

folderLinks : true,

useSelection : true,

useCookies : true,

useLines: true,

useIcons: true,

useStatusText : false,

closeSameLevel : false,

inOrder : false

}

this.icon = {

root: './fund/menu/img/base.gif',

folder : './fund/menu/img/folder.gif',

folderOpen : './fund/menu/img/folderopen.gif',

node: './fund/menu/img/page.gif',

empty: './fund/menu/img/empty.gif',

line: './fund/menu/img/line.gif',

join: './fund/menu/img/join.gif',

joinBottom : './fund/menu/img/joinbottom.gif',

plus: './fund/menu/img/plus.gif',

plusBottom : './fund/menu/img/plusbottom.gif',

minus: './fund/menu/img/minus.gif',

minusBottom : './fund/menu/img/minusbottom.gif',

nlPlus : './fund/menu/img/nolines_plus.gif',

nlMinus : './fund/menu/img/nolines_minus.gif'

}

this.obj = objName

this.aNodes = []

this.aIndent = []

this.root = new Node(-1)

this.selectedNode = null

this.selectedFound = false

this.completed = false

}

// Adds a new node to the node array

dTree.prototype.add = function(id, pid, name, url, title, target, icon, iconOpen, open) {

this.aNodes[this.aNodes.length] = new Node(id, pid, name, url, title, target, icon, iconOpen, open)

}

// Open/close all nodes

dTree.prototype.openAll = function() {

this.oAll(true)

}

dTree.prototype.closeAll = function() {

this.oAll(false)

}

// Outputs the tree to the page

dTree.prototype.toString = function() {

var str = '<div class="dtree">\n'

if (document.getElementById) {

if (this.config.useCookies) this.selectedNode = this.getSelected()

str += this.addNode(this.root)

} else str += 'Browser not supported.'

str += '</div>'

if (!this.selectedFound) this.selectedNode = null

this.completed = true

return str

}

// Creates the tree structure

dTree.prototype.addNode = function(pNode) {

var str = ''

var n=0

if (this.config.inOrder) n = pNode._ai

for (nn<this.aNodes.lengthn++) {

if (this.aNodes[n].pid == pNode.id) {

var cn = this.aNodes[n]

cn._p = pNode

cn._ai = n

this.setCS(cn)

if (!cn.target &&this.config.target) cn.target = this.config.target

if (cn._hc &&!cn._io &&this.config.useCookies) cn._io = this.isOpen(cn.id)

if (!this.config.folderLinks &&cn._hc) cn.url = null

if (this.config.useSelection &&cn.id == this.selectedNode &&!this.selectedFound) {

cn._is = true

this.selectedNode = n

this.selectedFound = true

}

str += this.node(cn, n)

if (cn._ls) break

}

return str

}

// Creates the node icon, url and text

dTree.prototype.node = function(node, nodeId) {

var str = '<div class="dTreeNode">' + this.indent(node, nodeId)

if (this.config.useIcons) {

if (!node.icon) node.icon = (this.root.id == node.pid) ? this.icon.root : ((node._hc) ? this.icon.folder : this.icon.node)

if (!node.iconOpen) node.iconOpen = (node._hc) ? this.icon.folderOpen : this.icon.node

if (this.root.id == node.pid) {

node.icon = this.icon.root

node.iconOpen = this.icon.root

}

str += '<img id="i' + this.obj + nodeId + '" src="' + ((node._io) ? node.iconOpen : node.icon) + '" alt="" />'

}

if (node.url) {

str += '<a id="s' + this.obj + nodeId + '" class="' + ((this.config.useSelection) ? ((node._is ? 'nodeSel' : 'node')) : 'node') + '" href="' + node.url + '"'

if (node.title) str += ' title="' + node.title + '"'

if (node.target) str += ' target="' + node.target + '"'

if (this.config.useStatusText) str += ' onmouseover="window.status=\'' + node.name + '\'return true" onmouseout="window.status=\'\'return true" '

if (this.config.useSelection &&((node._hc &&this.config.folderLinks) || !node._hc))

str += ' onclick="javascript: ' + this.obj + '.s(' + nodeId + ')"'

str += '>'

}

else if ((!this.config.folderLinks || !node.url) &&node._hc &&node.pid != this.root.id)

str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ')" class="node">'

str += node.name

if (node.url || ((!this.config.folderLinks || !node.url) &&node._hc)) str += '</a>'

str += '</div>'

if (node._hc) {

str += '<div id="d' + this.obj + nodeId + '" class="clip" style="display:' + ((this.root.id == node.pid || node._io) ? 'block' : 'none') + '">'

str += this.addNode(node)

str += '</div>'

}

this.aIndent.pop()

return str

}

// Adds the empty and line icons

dTree.prototype.indent = function(node, nodeId) {

var str = ''

if (this.root.id != node.pid) {

for (var n=0n<this.aIndent.lengthn++)

str += '<img src="' + ( (this.aIndent[n] == 1 &&this.config.useLines) ? this.icon.line : this.icon.empty ) + '" alt="" />'

(node._ls) ? this.aIndent.push(0) : this.aIndent.push(1)

if (node._hc) {

str += '<a href="javascript: ' + this.obj + '.o(' + nodeId + ')"><img id="j' + this.obj + nodeId + '" src="'

if (!this.config.useLines) str += (node._io) ? this.icon.nlMinus : this.icon.nlPlus

else str += ( (node._io) ? ((node._ls &&this.config.useLines) ? this.icon.minusBottom : this.icon.minus) : ((node._ls &&this.config.useLines) ? this.icon.plusBottom : this.icon.plus ) )

str += '" alt="" /></a>'

} else str += '<img src="' + ( (this.config.useLines) ? ((node._ls) ? this.icon.joinBottom : this.icon.join ) : this.icon.empty) + '" alt="" />'

}

return str

}

// Checks if a node has any children and if it is the last sibling

dTree.prototype.setCS = function(node) {

var lastId

for (var n=0n<this.aNodes.lengthn++) {

if (this.aNodes[n].pid == node.id) node._hc = true

if (this.aNodes[n].pid == node.pid) lastId = this.aNodes[n].id

}

if (lastId==node.id) node._ls = true

}

// Returns the selected node

dTree.prototype.getSelected = function() {

var sn = this.getCookie('cs' + this.obj)

return (sn) ? sn : null

}

// Highlights the selected node

dTree.prototype.s = function(id) {

if (!this.config.useSelection) return

var cn = this.aNodes[id]

if (cn._hc &&!this.config.folderLinks) return

if (this.selectedNode != id) {

if (this.selectedNode || this.selectedNode==0) {

eOld = document.getElementById("s" + this.obj + this.selectedNode)

eOld.className = "node"

}

eNew = document.getElementById("s" + this.obj + id)

eNew.className = "nodeSel"

this.selectedNode = id

if (this.config.useCookies) this.setCookie('cs' + this.obj, cn.id)

}

// Toggle Open or close

dTree.prototype.o = function(id) {

var cn = this.aNodes[id]

this.nodeStatus(!cn._io, id, cn._ls)

cn._io = !cn._io

if (this.config.closeSameLevel) this.closeLevel(cn)

if (this.config.useCookies) this.updateCookie()

}

// Open or close all nodes

dTree.prototype.oAll = function(status) {

for (var n=0n<this.aNodes.lengthn++) {

if (this.aNodes[n]._hc &&this.aNodes[n].pid != this.root.id) {

this.nodeStatus(status, n, this.aNodes[n]._ls)

this.aNodes[n]._io = status

}

if (this.config.useCookies) this.updateCookie()

}

// Opens the tree to a specific node

dTree.prototype.openTo = function(nId, bSelect, bFirst) {

if (!bFirst) {

for (var n=0n<this.aNodes.lengthn++) {

if (this.aNodes[n].id == nId) {

nId=n

break

}

var cn=this.aNodes[nId]

if (cn.pid==this.root.id || !cn._p) return

cn._io = true

cn._is = bSelect

if (this.completed &&cn._hc) this.nodeStatus(true, cn._ai, cn._ls)

if (this.completed &&bSelect) this.s(cn._ai)

else if (bSelect) this._sn=cn._ai

this.openTo(cn._p._ai, false, true)

}

// Closes all nodes on the same level as certain node

dTree.prototype.closeLevel = function(node) {

for (var n=0n<this.aNodes.lengthn++) {

if (this.aNodes[n].pid == node.pid &&this.aNodes[n].id != node.id &&this.aNodes[n]._hc) {

this.nodeStatus(false, n, this.aNodes[n]._ls)

this.aNodes[n]._io = false

this.closeAllChildren(this.aNodes[n])

}

// Closes all children of a node

dTree.prototype.closeAllChildren = function(node) {

for (var n=0n<this.aNodes.lengthn++) {

if (this.aNodes[n].pid == node.id &&this.aNodes[n]._hc) {

if (this.aNodes[n]._io) this.nodeStatus(false, n, this.aNodes[n]._ls)

this.aNodes[n]._io = false

this.closeAllChildren(this.aNodes[n])

}

// Change the status of a node(open or closed)

dTree.prototype.nodeStatus = function(status, id, bottom) {

eDiv = document.getElementById('d' + this.obj + id)

eJoin = document.getElementById('j' + this.obj + id)

if (this.config.useIcons) {

eIcon = document.getElementById('i' + this.obj + id)

eIcon.src = (status) ? this.aNodes[id].iconOpen : this.aNodes[id].icon

}

eJoin.src = (this.config.useLines)?

((status)?((bottom)?this.icon.minusBottom:this.icon.minus):((bottom)?this.icon.plusBottom:this.icon.plus)):

((status)?this.icon.nlMinus:this.icon.nlPlus)

eDiv.style.display = (status) ? 'block': 'none'

}

// [Cookie] Clears a cookie

dTree.prototype.clearCookie = function() {

var now = new Date()

var yesterday = new Date(now.getTime() - 1000 * 60 * 60 * 24)

this.setCookie('co'+this.obj, 'cookieValue', yesterday)

this.setCookie('cs'+this.obj, 'cookieValue', yesterday)

}

// [Cookie] Sets value in a cookie

dTree.prototype.setCookie = function(cookieName, cookieValue, expires, path, domain, secure) {

document.cookie =

escape(cookieName) + '=' + escape(cookieValue)

+ (expires ? 'expires=' + expires.toGMTString() : '')

+ (path ? 'path=' + path : '')

+ (domain ? 'domain=' + domain : '')

+ (secure ? 'secure' : '')

}

// [Cookie] Gets a value from a cookie

dTree.prototype.getCookie = function(cookieName) {

var cookieValue = ''

var posName = document.cookie.indexOf(escape(cookieName) + '=')

if (posName != -1) {

var posValue = posName + (escape(cookieName) + '=').length

var endPos = document.cookie.indexOf('', posValue)

if (endPos != -1) cookieValue = unescape(document.cookie.substring(posValue, endPos))

else cookieValue = unescape(document.cookie.substring(posValue))

}

return (cookieValue)

}

// [Cookie] Returns ids of open nodes as a string

dTree.prototype.updateCookie = function() {

var str = ''

for (var n=0n<this.aNodes.lengthn++) {

if (this.aNodes[n]._io &&this.aNodes[n].pid != this.root.id) {

if (str) str += '.'

str += this.aNodes[n].id

}

this.setCookie('co' + this.obj, str)

}

// [Cookie] Checks if a node id is in a cookie

dTree.prototype.isOpen = function(id) {

var aOpen = this.getCookie('co' + this.obj).split('.')

for (var n=0n<aOpen.lengthn++)

if (aOpen[n] == id) return true

return false

}

// If Push and pop is not implemented by the browser

if (!Array.prototype.push) {

Array.prototype.push = function array_push() {

for(var i=0i<arguments.lengthi++)

this[this.length]=arguments[i]

return this.length

}

if (!Array.prototype.pop) {

Array.prototype.pop = function array_pop() {

lastElement = this[this.length-1]

this.length = Math.max(this.length-1,0)

return lastElement

}

菜单这一动态学院全选

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