请问使用有一组TextBox，（最多显示5组，最少一组），想通过“增加”，“删除”按钮来添加，减少一组TextBox，请问大家如何使用javascript实现？

根据你个人需求了
可以控制隐:$("").style.visibility = "hidden"
也可以生成
createElement("");
appendChild();

解决方案 »

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
  <TITLE> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
</HEAD>
<script type="text/javascript">
var CreateText=function(){
var module=document.getElementById("textmoudle");
var a = document.createElement("input");
a.id="num"
    a.type = "text";
    a.value = "";
module.appendChild(a);
};
var DeleteText=function(){
var module=document.getElementById("textmoudle");
var texts=document.getElementsByTagName("num");
module.removeChild(document.getElementsByTagName("num")[0]);
};
</script>
<BODY>
<input type="button" value="增加" onclick="CreateText()"/>
<input type="button" value="删除" onclick="DeleteText()"/>
<hr/>
<div id="textmoudle">
  <input id="num" type="text" value=""/>
  </div>
</BODY>
</HTML>
--------------------
没有测试！请测试下
JS操作表格,添加删除一组文本框的行
http://blog.chinaunix.net/u1/57965/showart_688399.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
  <TITLE> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
</HEAD>
<script type="text/javascript">
var CreateText=function(){
var module=document.getElementById("textmoudle");
var a = document.createElement("input");
a.id="num"
    a.type = "text";
    a.value = "";
module.appendChild(a);
};
var DeleteText=function(){
var module=document.getElementById("textmoudle");
var texts=document.getElementsByName("num");
//alert(texts.length);
module.removeChild(document.getElementsByName("num")[0]);
};
</script>
<BODY>
<input type="button" value="增加" onclick="CreateText()"/>
<input type="button" value="删除" onclick="DeleteText()"/>
<hr/>
<div id="textmoudle">
  <input id="num" type="text" value=""/>
    <input id="num" type="text" value=""/>
  </div>
</BODY>
</HTML>
====================
不好意思，我测试了，有点问题！这个是修改了下！
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档 </title>
<head>
</head>
<script>
var create_element = function()
{
var _input = document.createElement("input");
var _button = document.createElement("input");
var _del_button = document.createElement("input");
_button.setAttribute("type","button");
_button.setAttribute("value",'增加');
_del_button.setAttribute("type","button");
_del_button.setAttribute("value","删除");
document.body.appendChild(_input);
document.body.appendChild(_button);
document.body.appendChild(_del_button);
}

var add_input = function()
{
var _input = document.createElement("input");
_input.setAttribute("type","text");
document.body.appendChild(_input);
}

var remove_input = function()
{
document.body.removeChild(document.body.lastChild);
}

window.onload = function()
{
create_element();
if(document.all)
{
document.body.lastChild.previousSibling.attachEvent("onclick",add_input);
document.body.lastChild.attachEvent("onclick",remove_input);
}
else
{
document.body.lastChild.previousSibling.addEventListener("click",add_input,false);
document.body.lastChild.addEventListener("click",remove_input,false);
}
}
</script>
<body></body>
</html>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
  <TITLE> New Document </TITLE>
  <META NAME="Generator" CONTENT="EditPlus">
  <META NAME="Author" CONTENT="">
  <META NAME="Keywords" CONTENT="">
  <META NAME="Description" CONTENT="">
</HEAD>
<script type="text/javascript">
var CreateText=function(){
if(document.getElementsByName("num").length +1 >5)
{
alert("已经5个了，不能继续添加！");
return ;
}
var module=document.getElementById("textmoudle");
var a = document.createElement("input");
a.id="num"
    a.type = "text";
    a.value = "";
module.appendChild(a);
};
var DeleteText=function(){
if(document.getElementsByName("num").length ==1)
{
alert("已经剩下最后一个了，不要再删除了！谢谢！");
return ;
}
var module=document.getElementById("textmoudle");
var texts=document.getElementsByName("num");
//alert(texts.length);
module.removeChild(document.getElementsByName("num")[0]);
};
</script>
<BODY>
<input type="button" value="增加" onclick="CreateText()"/>
<input type="button" value="删除" onclick="DeleteText()"/>
<hr/>
<div id="textmoudle">

  </div>
</BODY>
</HTML>
小例子：
<script type="text/javascript">
var p=1;
function pga(){p=p;return p;}
function Up_page(){if(p<=1)p=1;else p=p-1;return p;}
function Down_page(){if(p<5)p=p+1;return p;}
function bbb(aa)
{
   var obj=document.getElementById("ccc");
   var html="";
   for(i=1;i<=aa;i++)
   {
   html+="<input type='textbox' name=user+'i+1'/>"
   }
   obj.innerHTML=html;
}
</script>
  </head>
  <body>
  <div id="ccc"><input type='textbox' name=user1/></div>
  <input type="button" value="添加" onclick="bbb(Down_page());"/>
  <input type="button" value="删除" onclick="bbb(Up_page());"/>
  </body>
</html>
谢谢楼上各位!!!不过跟我的票求对不上.是我没说清楚.
有一组输入框(三个TextBox,两个DropdownList),最少显示一组.通过增加,删除按钮来显示一组至五组输入框．最多显示五组．
我将输入框放在DIV中，做成五个DIV中，通过DIV的visible属性来控制是否显示，但是我无论是设成<div visible="true">，
还是<div visible="false">都没有反应。请问是怎么回事？》
<div style="visibility:hidden" >111</div>
//是style.visibility，不是div.visible
div.style.visibility="visible";
div.style.visibility="hidden";div.style.display="none"//隐藏
div.style.display="block"//显示建议使用style.display，使用visibility的话会占位置
<select id="Select_P">
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
            <option value="4">4</option>
            <option value="5">5</option></select>
       <div id="div_cjr_1">
           </div>
<div id="div_cjr_2">
           </div>
<div id="div_cjr_3">
           </div>
<div id="div_cjr_4">
           </div>
<div id="div_cjr_5">
           </div>
window.onload=initForm;
window.onunload=function() {};function initForm()
{
   document.getElementById("Select_P").selectedIndex=0;
   document.getElementById("Select_P").onchange=changnum;
}function changnum()
{
  var newnum=document.getElementById("Select_P");

  for(var i=0;i<newnum;i++)
  {
    div_cjr_[i].style.display="block";//显示
  }

}
选择列表怎么没反应呢？？
<select id="Select_P">
            <option value="1">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
            <option value="4">4</option>
            <option value="5">5</option></select>
       <div id="div_cjr_1">1
           </div>
<div id="div_cjr_2">2
           </div>
<div id="div_cjr_3">3
           </div>
<div id="div_cjr_4">4
           </div>
<div id="div_cjr_5">5
           </div> <script>
window.onload=initForm;
window.onunload=function() {};function initForm()
{
   document.getElementById("Select_P").selectedIndex=0;
  for(i=2;i<=5;i++)
  {
    document.getElementById("div_cjr_"+i).style.display="none";//隐藏2-5，因为你上面设置了只显示1个div
  }
   document.getElementById("Select_P").onchange=changnum;
}function changnum()
{
  var newnum=parseInt(document.getElementById("Select_P").value);
  var i,j;
  for(i=1;i<=newnum;i++)
  {
    document.getElementById("div_cjr_"+i).style.display="block";//显示
  }
  for(j=i;i<=5;i++)
  {
    document.getElementById("div_cjr_"+j).style.display="none";//隐藏
  }
}
</script>
div 显示style='display:none';是隐藏
    显示style='display:block';显示默认是显示