js 增删节点 | 易学教程

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>增加Table行</title>
</head>
<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:删除按钮
   var newDeleteTD=newTR.insertCell(3);
   //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);

   //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>
<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="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>

来源：https://www.cnblogs.com/hclw/p/4320330.html

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