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dropdownlist之间的互相联动实现（显示与隐藏）_javascript技巧

来源：欧宁财经

代码如下:

var Arrchange1 =new Array ();
var Arrchange2 =new Array ();
var Arrchange3 =new Array ();
function hide(s_id,index)
{
var xxx = document .getElementById (s_id);
var oldOption = xxx.children(index);
var oldStr = oldOption.innerText;
var newOption = document.createElement(']*)(>)/)[2] +'>');
newOption.innerText= oldStr;
newOption.swapNode(oldOption);
//alert(xxx.innerHTML);
}

function show(s_id,index)
{
var xxx =document .getElementById (s_id);
var oldOption = xxx.children(index);
if(oldOption.tagName=='DIV')
{
var oldStr = oldOption.innerText;
var newOption = document.createElement(']*)(>)/)[2] +'>');
newOption.innerText = oldStr;
newOption.swapNode(oldOption);
}
//alert(xxx.innerHTML);
}

function onchange1()
{
var s_index=document .getElementById ("Ddl_question1").options[document .getElementById ("Ddl_question1").selectedIndex].value;
s_index = parseInt(s_index);
if(s_index ==0)
{
show ('Ddl_question2',Arrchange1 [0] );
show ('Ddl_question3',Arrchange1 [0] );
Arrchange1.pop();
}
else
{
Arrchange1.push(s_index);
if(Arrchange1.length>0)
{
show ('Ddl_question2',Arrchange1 [0] );
}
if(Arrchange1.length>0)
{
show ('Ddl_question3',Arrchange1 [0] );
}
hide('Ddl_question2',s_index);
hide('Ddl_question3',s_index);
}
}
function onchange2()
{
var s_index=document .getElementById ("Ddl_question2").options[document .getElementById ("Ddl_question2").selectedIndex].value;
s_index = parseInt(s_index);
if(s_index ==0)
{
show ('Ddl_question1',Arrchange1 [0] );
show ('Ddl_question3',Arrchange3 [0] );
Arrchange2.pop();
}
else
{
Arrchange2.push(s_index);
if(Arrchange2.length>0)
{
show ('Ddl_question1',Arrchange2 [0] );
}
if(Arrchange2.length>0)
{
show ('Ddl_question3',Arrchange2 [0] );
}
hide('Ddl_question1',s_index);
hide('Ddl_question3',s_index);
}
}
function onchange3()
{
var s_index=document .getElementById ("Ddl_question3").options[document .getElementById ("Ddl_question3").selectedIndex].value;
s_index = parseInt(s_index);
if(s_index ==0)
{
show ('Ddl_question1',Arrchange3 [0] );
show ('Ddl_question2',Arrchange3 [0] );
Arrchange3.pop();
}
else
{
Arrchange3.push(s_index);
if(Arrchange1.length>0)
{
show ('Ddl_question1',Arrchange3 [0] );
}
if(Arrchange2.length>0)
{
show ('Ddl_question2',Arrchange3 [0] );
}
hide('Ddl_question1',s_index);
hide('Ddl_question2',s_index);
}
}

function a() {alert("fuck ");}

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