如何实现点击button按钮，在页面上新增加一个文本框

看看这个，不但增加了，而且还添加了序号等http://lucky.myrice.com/javascriptexam/addelement.htm

源代码
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<META content="MSHTML 6.00.2719.2200" name=GENERATOR></HEAD>
<BODY>
<TABLE cellSpacing=0 cellPadding=0 width="98%" align=center border=0>
  <TBODY>
  <TR>
    <FORM id=form1 name=form1 action=program/survey/SurveyEdit.asp method=post>
    <TD>
      <TABLE class=tableborder cellSpacing=0 cellPadding=4 width="100%"
border=0>
        <TBODY>
        <TR>
          <TD bgColor=#c7e8f8>
            <DIV align=center><B>问题 1:</B> </DIV></TD>
          <TD bgColor=#c7e8f8><INPUT class=tableborder size=60 name=Question1>
          </TD></TR>
        <TR>
          <TD> </TD>
          <TD><B>问题类型： </B><INPUT type=checkbox value=True name=chkQueType1>
            多选类型 <BR>
            <DIV id=__idQueOption1 name="__idQueOption1"><B>问题选项：</B> <INPUT
            class=tableborder onpropertychange=addNewChild(this) size=60
            name=QueOption1> </DIV></TD></TR></TBODY></TABLE>
      <DIV id=__idInsertBefore></DIV><INPUT type=hidden value=1 name=newTable>
      <BR>
      <DIV
      style="PADDING-RIGHT: 4px; PADDING-LEFT: 4px; PADDING-BOTTOM: 4px; PADDING-TOP: 4px"
      align=right><INPUT class=CustButton onclick=addNewQuestion() type=button value=增加一个新问题>
<INPUT class=CustButton type=submit value=保存设置> <INPUT class=CustButton type=reset value=重新设置>
</DIV></TD></FORM></TR></TBODY></TABLE>
<SCRIPT>
function addNewQuestion()
{document.form1.newTable.value =  parseInt(document.form1.newTable.value) + 1;
var newItemId;
if( (document.form1.newTable.value).length > 2 )
{
alert("您的调查问题总数不能超过 99 个。")
window.location.reload();
}newItemId = document.form1.newTable.value;var objItem = '<table cellspacing="0" cellpadding="4" width="100%" border="0" class="tableborder">';
objItem += '  <tr>';
objItem += '<td bgcolor="#C7E8F8">';
objItem += '      <div align="center"><b>问题 ' + newItemId + ':</b> </div>';
objItem += '    </td>';
objItem += '    <td bgcolor="#C7E8F8">';
objItem += '      <input size="60" name="Question' + newItemId + '" class="tableborder">';
objItem += '    </td>';
objItem += '  </tr>';
objItem += '  <tr>';
objItem += '    <td> </td>';
objItem += '    <td><b>问题类型： </b><input type="checkbox" value="True" name="chkQueType' + newItemId + '">';
objItem += '      多选类型 <br>';
objItem += '      <div id="__idQueOption' + newItemId + '"><b>问题选项：</b>';
objItem += '        <input onpropertychange="addNewChild(this)" size="60" name="QueOption' + newItemId + '" class="tableborder">';
objItem += '      </div>';
objItem += '    </td>';
objItem += '  </tr>';
objItem += '</table>';document.all.__idInsertBefore.insertAdjacentHTML("beforeBegin", objItem);
}function showTips(obj)
{
obj.title=obj.value;
}function addNewChild(obj)
{
var isblank = "false";
var objName = obj.name;
var last2Char = objName.substring(objName.length - 2);
if( last2Char.substring(0, 1) > '9' || last2Char.substring(0, 1) < '0' )
{
last2Char = last2Char.substring(1, 2);
}for(var i=0; i < document.form1.elements[objName].length; i++)
{
if(document.form1.elements[objName].item(i).value == "")
isblank = "yes"
}if( isblank != "yes" )
{
var objItem = '<div id="__idQueOption' + last2Char + '"><b>问题选项：</b>';
   objItem += '  <input onpropertychange="addNewChild(this)" size="60" name="' + objName + '" class="tableborder" />';
   objItem += '</div>';objName = "__idQueOption" + last2Char;
var varQueOption = document.all[objName];
if( varQueOption.length != null )
  varQueOption = varQueOption.item(varQueOption.length-1);varQueOption.insertAdjacentHTML("afterEnd",objItem);
}
}
</SCRIPT>
</BODY></HTML>

这个也是：<head>
<title>Shi's sample</title><script language="JavaScript">function addRowToTable()
{
    var tbl = document.getElementById('tblSample');
    var lastRow = tbl.rows.length;
    var iteration = lastRow;
    var row = tbl.insertRow(lastRow);

    var cellLeft = row.insertCell(0);
    var textNode = document.createTextNode(iteration);
    cellLeft.appendChild(textNode);

    var cellRight = row.insertCell(1);
    var el = document.createElement('input');
    el.setAttribute('type', 'text');
    el.setAttribute('name', 'txtRow' + iteration);
    el.setAttribute('size', '40');
    cellRight.appendChild(el);
}
</script>
</head><body>
<form action="tableaddrow_nw.html" method="get"><input type="button" value="Add" onclick="addRowToTable();" />
<table border="1" id="tblSample">
    <tr>
        <th colspan="2">Sample table</th>
    </tr>
    <tr>
        <td>1</td>
        <td><input type="text" name="txtRow1" size="40" /></td>
        <td width="30%"> </td>
    </tr>
</table></form>
</body>

<html>
<head>
<title>无标题文档</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<script language="javascript">
function addRow(src){
//alert(src);
var newrow = src.insertRow(src.rows.length-1);
newrow.height=20;
var i=4;
while(i--){
var newcell = newrow.insertCell();
switch(i){
case 0: newcell.innerHTML= '<input type="button" onClick="javascript:delRow(this.parentElement.parentElement)" value="删除此行">';break;
default: newcell.innerHTML=div1.innerHTML;break;
}
}
}
function delRow(src){
var tab=src.parentElement;
var i=tab.rows.length;
while(i--){
if(src==tab.rows[i]){
alert("就是这行----"+ i);
tab.deleteRow(i);
}
}
}
</script>
</head><body>
<table id="tb" width="100%"  border="1" align="center" cellpadding="1" cellspacing="1" style="border-collapse:collapse" bordercolor="#111111">
  <tr>
    <th scope="col" width="25%">奶类</th>
    <th scope="col" width="25%">数量</th>
    <th scope="col" width="25%">总重</th>
    <th scope="col" width="25%">单价</th>
  </tr>
  <tr id="blankRow" onClick="addRow(this.parentElement)">
    <td> </td>
    <td> </td>
    <td> </td>
    <td> </td>
  </tr>
</table>
<div id="div1" style="display:none "><input id="txt" type="text" style="width:97%; background-color:#FFFFEF"></div>
</body>
</html>
自己写的

onclick()
{
  var objbtn= document.createElement("INPUT");
  objbtn.type = 'text';
  objbtn.style.height=20px;
  objbtn.style.width = 40px;
  ....
  form.insertAdjacentElement("beforeEnd", objbtn); }

调试易

如何实现点击button按钮，在页面上新增加一个文本框

解决方案 »