js怎么清空tr
2020-07-16 07:09:26 来源:易采站长站 作者:
本篇文章将介绍如何使用js清空tr里的所有数据。

使用js清空tr里的数据,首先你要获取第一个td的要删除行的Index,然后进行循环操作,将tr中的td的数据都删除一遍,这时tr就被清空了。这是一个思路,下面的代码进行这样写的,当然,如果你对节点,选择器理解透彻,还将以将以下代码更加的简化.
请看以下代码:
<!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;}//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Indexvar 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1var txtTRLastIndex = findObj("txtTRLastIndex",document);txtTRLastIndex.value = "1"; }}</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>
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