js实现table添加行tr、删除行tr、清空行tr的简单实例

如下所示：

<!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="">
<script language="javascript">// Example: obj = findObj("image1");
function findObj(theObj, theDoc)
{
var p, i, foundObj;
if(!theDoc) theDoc = document;
if( (p = theObj.indexOf("?")) > 0 && parent.frames.length)
{  theDoc = parent.frames[theObj.substring(p+1)].document;  theObj = theObj.substring(0,p); } if(!(foundObj = theDoc[theObj]) && theDoc.all) foundObj = theDoc.all[theObj]; for (i=0; !foundObj && i < theDoc.forms.length; i++)   foundObj = theDoc.forms[i][theObj]; for(i=0; !foundObj && theDoc.layers && i < theDoc.layers.length; i++)   foundObj = findObj(theObj,theDoc.layers[i].document); if(!foundObj && document.getElementById) foundObj = document.getElementById(theObj);  return foundObj;
}
//添加一个参与人填写行
function AddSignRow(){ //读取最后一行的行号，存放在txtTRLastIndex文本框中
var txtTRLastIndex = findObj("txtTRLastIndex",document);
var rowID = parseInt(txtTRLastIndex.value); 

var signFrame = findObj("SignFrame",document);
//添加行
var newTR = signFrame.insertRow(signFrame.rows.length);
newTR.id = "SignItem" + rowID; 

//添加列:序号
var newNameTD=newTR.insertCell(0);
//添加列内容
newNameTD.innerHTML = newTR.rowIndex.toString(); 

//添加列:姓名
var newNameTD=newTR.insertCell(1);
//添加列内容
newNameTD.innerHTML = "<input name='txtName" + rowID + "' id='txtName" + rowID + "' type='text' size='12' />"; 

//添加列:电子邮箱
var newEmailTD=newTR.insertCell(2);
//添加列内容
newEmailTD.innerHTML = "<input name='txtEMail" + rowID + "' id='txtEmail" + rowID + "' type='text' size='20' />"; 

//添加列:电话
var newTelTD=newTR.insertCell(3);
//添加列内容
newTelTD.innerHTML = "<input name='txtTel" + rowID + "' id='txtTel" + rowID + "' type='text' size='10' />"; 

//添加列:手机
var newMobileTD=newTR.insertCell(4);
//添加列内容
newMobileTD.innerHTML = "<input name='txtMobile" + rowID + "' id='txtMobile" + rowID + "' type='text' size='12' />"; 

//添加列:公司名
var newCompanyTD=newTR.insertCell(5);
//添加列内容
newCompanyTD.innerHTML = "<input name='txtCompany" + rowID + "' id='txtCompany" + rowID + "' type='text' size='20' />"; 

//添加列:删除按钮
var newDeleteTD=newTR.insertCell(6);
//添加列内容
newDeleteTD.innerHTML = "<div align='center' style='width:40px'><a href='javascript:;' onclick=\"DeleteSignRow('SignItem" + rowID + "')\">删除</a></div>"; 

//将行号推进下一行
txtTRLastIndex.value = (rowID + 1).toString() ;
}
//删除指定行
function DeleteSignRow(rowid){
var signFrame = findObj("SignFrame",document);
var signItem = findObj(rowid,document);
alert(rowid);
//获取将要删除的行的Index
var rowIndex = signItem.rowIndex; 

//删除指定Index的行
signFrame.deleteRow(rowIndex); 

//重新排列序号，如果没有序号，这一步省略
for(i=rowIndex;i<signFrame.rows.length;i++){
signFrame.rows[i].cells[0].innerHTML = i.toString();
}
}
//清空列表
function ClearAllSign(){
if(confirm('确定要清空所有参与人吗？')){
var signFrame = findObj("SignFrame",document);
var rowscount = signFrame.rows.length; 

//循环删除行,从最后一行往前删除
for(i=rowscount - 1;i > 0; i--){
  signFrame.deleteRow(i);
} 

//重置最后行号为1
var txtTRLastIndex = findObj("txtTRLastIndex",document);
txtTRLastIndex.value = "1"; 

//预添加一行
AddSignRow();
}
}
</script>
</HEAD> 

<BODY>
<div>
<table width="613" border="0" cellpadding="2" cellspacing="1" id="SignFrame">
       <tr id="trHeader">
        <td width="27" bgcolor="#96E0E2">序号</td>
        <td width="64" bgcolor="#96E0E2">用户姓名</td>
        <td width="98" bgcolor="#96E0E2">电子邮箱</td>
        <td width="92" bgcolor="#96E0E2">固定电话</td>
        <td width="86" bgcolor="#96E0E2">移动手机</td>
        <td width="153" bgcolor="#96E0E2">公司名称</td>
        <td width="57" align="center" bgcolor="#96E0E2"> </td>
       </tr>
    </table>
  </div>
  <div>
    <input type="button" name="Submit" value="添加参与人" onclick="AddSignRow()" />
   <input type="button" name="Submit2" value="清空" onclick="ClearAllSign()" />
   <input name='txtTRLastIndex' type='hidden' id='txtTRLastIndex' value="1" />
  </div> 

</BODY>
</HTML> 

删除行 用下面的方法比较好……

<html>
<head>
<title>1</title>
<script>
//得到行对象
function getRowObj(obj)
{
var i = 0;
while(obj.tagName.toLowerCase() != "tr"){
obj = obj.parentNode;
if(obj.tagName.toLowerCase() == "table")return null;
}
return obj;
} 

//根据得到的行对象得到所在的行数
function getRowNo(obj){
var trObj = getRowObj(obj);
var trArr = trObj.parentNode.children;
for(var trNo= 0; trNo < trArr.length; trNo++){
if(trObj == trObj.parentNode.children[trNo]){
alert(trNo+1);
}
}
} 

//删除行
function delRow(obj){
var tr = this.getRowObj(obj);
if(tr != null){
tr.parentNode.removeChild(tr);
}else{
throw new Error("the given object is not contained by the table");
}
}
</script>
</head> 

<body>
<table border = "1">
<tr>
<td>A<input type="button" value="A" onclick="getRowNo(this)">getRowNo<td>
</tr>
<tr>
<td>B<input type="button" value="B" onclick="delRow(this)">delRow<td>
</tr>
<tr>
<td>C<input type="button" value="C" onclick="getRowNo(this)">getRowNo</td>
</tr>
<tr>
<td>D<input type="button" value="D" onclick="getRowNo(this)">getRowNo</td>
</tr>
</table>
</body>
<html> 

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