关联的Select，可以支持客户端动态更新- Javascript

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Javascript 中的关联的Select，可以支持客户端动态更新

出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-10-12 浏览: 201 ::

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[原创]比较方便的onMouseWheel缩放图片效果 Prototype 1.5.0_rc1 及 Prototype 1.5.0 Pre0小抄本

这是我很久就写好了的一个小程序。关联的Select，前后的select都是关联的，前面的select影响到后面的内容，为了防止服务器的重新读的负担，我加入了客户端自动更新功能，这样每次更新都不必再读取数据库而刷新页面。
虽然是为了我现在正在做的一个系统而设计的（可以运用到数据库里去），但是它的实现理论应该有人会用得到吧。
现在我放出来让大家研究，研究。也欢迎大家指出不足的地方。
下载文件

点击下载此原代码
演示(演示无法添加数据，请下载原代码)

点击运行可以看到效果:

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>Test</title>
<script>
var fy=new Array()
var fl=new Array()
var mx=new Array()
var lb=new Array()
var sendvalue=new openvalue("","","")
var tArray=new Array("fy","fl","mx","lb")
//--主类别结构--
function mainArray(fyid,text)
{
this.fyid=fyid
this.text=text
}
//--关联类别结构--
function childArray(id,fatherid,text)
{
this.id=id
this.fatherid=fatherid
this.text=text
}
function openvalue(whatdo,fid,ftext)
{
this.whatdo=whatdo
this.fid=fid
this.ftext=ftext
}
//--添加数组--
function addArray(id,fatherid,text,ArrayName,Type)
{
var AN=eval(ArrayName)
if (Type==0) { AN[AN.length]=new mainArray(id,text) }
if (Type==1) { AN[AN.length]=new childArray(id,fatherid,text) }
}
//--添加数据到select--
function addSelect(value,text,sel)
{
var selectbox=eval("document.forms[0]."+sel)
var newoption=document.createElement("OPTION"); selectbox.add(newoption)
if (value=="add") { newoption.text=text selectbox.options[selectbox.length-1].style.backgroundColor="#FFEEEE" } else { newoption.text=" "+text } newoption.value=value
}
//--从数组里读出数据--
function loadSelect(ArrayName,Type,fatherid)
{
removeall(ArrayName)
var AN=eval(ArrayName)
switch (Type){
case 0:
for (i=0;i<AN.length;i++)
{
addSelect(AN[i].fyid,AN[i].text,ArrayName)
}
addSelect("add","<添加数据>",ArrayName)
break;
case 1:
for (i=0;i<AN.length;i++)
{
if (AN[i].fatherid==fatherid)
{
addSelect(AN[i].id,AN[i].text,ArrayName)
}
}
addSelect("add","<添加数据>",ArrayName)
break;
}
}
//--删除所有选项--
function removeall(sel)
{
var selectbox=eval("document.forms[0]."+sel)
selectbox.options.length=1
selectbox.options[0].selected
}
//--改变选择时--
function change_select(c_sel){
for (i=0;i<tArray.length;i++)
{
if (tArray[i]==c_sel)
{ if (i>0) {var lastsel=tArray[i-1]} var nowsel=tArray[i] if (i<tArray.length) {var nextsel=tArray[i+1]}
}
}
if (lastsel) {last_sel=eval("document.forms[0]."+lastsel)}
now_sel=eval("document.forms[0]."+nowsel)
if (nextsel) {next_sel=eval("document.forms[0]."+nextsel)}
if (now_sel.value=="add")
{
if (lastsel) { if (last_sel.selectedIndex==0 || last_sel.selectedIndex==last_sel.length-1) {alert("选择继承对象");return}
showpop("pop.htm",nowsel,last_sel.value,last_sel.options[last_sel.selectedIndex].text)
}
else
{
showpop("pop.htm",nowsel)
}
return
}
if (now_sel.value=="null")
{
del=false
for (i=0;i<tArray.length;i++)
{
if (tArray[i]==nextsel) del=true
if (del) {removeall(tArray[i])
}
}
}
else
{
if (nextsel) loadSelect(nextsel,1,now_sel.value)
}
}
//--打开新窗口--
function showpop(url,id,fatherid,fathertext){
sendvalue=new openvalue(id,fatherid,fathertext) var width=300; var height=140; var w = 1024; var h = 768; if (document.all || document.layers) { w = screen.availWidth; h = screen.availHeight; } var leftPos = (w/2-width/2); var topPos = (h/2.3-height/2.3);
var pop=window.open(url,"","width="+width+",height="+height+",top="+topPos+",left="+leftPos)
}
</script>
</head>
<script>
//--添加费用类别--
addArray("1","","工程费用","fy",0)
addArray("2","","固定费用","fy",0)
//--添加分类--
addArray("1","1","包工包料","fl",1)
addArray("2","1","人工","fl",1)
addArray("3","1","材料","fl",1)
addArray("4","1","运杂费","fl",1)
addArray("5","1","消费城管","fl",1)
addArray("6","1","管理费用","fl",1)
addArray("7","1","税费","fl",1)
addArray("8","1","交际费","fl",1)
addArray("9","2","工资","fl",1)
addArray("10","2","房租","fl",1)
addArray("11","2","水电","fl",1)
addArray("12","2","电话","fl",1)
addArray("13","2","办公用品","fl",1)
addArray("14","2","广告","fl",1)
//--添加明细--
addArray("1","1","铝合金","mx",1)
addArray("2","1","不锈钢","mx",1)
addArray("3","1","家具","mx",1)
addArray("4","2","木工","mx",1)
addArray("5","2","泥工","mx",1)
addArray("6","2","水工","mx",1)
//--添加材料类别--
addArray("1","1","铝合金1","lb",1)
addArray("2","1","铝合金2","lb",1)
addArray("3","1","铝合金3","lb",1)
function pageload(){
loadSelect("fy",0)
}
</script>
<body onload=pageload()>
<b>演示中(演示无法添加数据，请下载原代码)</b>
<form name="frm"> <select size="1" name="fy" onchange='change_select("fy")'> <option value="null" style="background-color:#EEEEFF" selected>选择类别--</option> <option value="add" style="background-color:#FFEEEE"><添加数据></option> </select> <select size="1" name="fl" onchange='change_select("fl")'> <option value="null" style="background-color:#EEEEFF" selected>选择分类--</option> </select> <select size="1" name="mx" onchange='change_select("mx")'> <option value="null" style="background-color:#EEEEFF" selected>选择明细--</option> </select> <select size="1" name="lb" onchange='change_select("lb")'> <option value="null" style="background-color:#EEEEFF" selected>选择材料类别--</option> </select> <input type="button" value="按钮" name="B1">
</form>
</body>
</html>

[Ctrl+A 全选提示:你可先修改部分代码,再按运行]

[原创]比较方便的onMouseWheel缩放图片效果 Prototype 1.5.0_rc1 及 Prototype 1.5.0 Pre0小抄本

Javascript 中的 关联的Select，可以支持客户端动态更新

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Javascript 中的关联的Select，可以支持客户端动态更新