Js implementation dynamic add delete Table row example

Recently, I encountered an operation to dynamically add and delete table rows in my project

The HTML code

 
<table cellpadding="0" cellspacing="0" border="1" style="margin:auto; width:96%;" id="LearnInfoItem"> 
<tr > 
<td colspan="8" bgcolor="#96E0E2" style="height:30px;" ><h3 style="text-align:center; margin:0;"> Main learning resume </h3></td> 
</tr> 
<tr id="tr1"> 
<td class="tdStyle2"> All the time  </td> 

<td class="tdStyle2"> Graduate School </td> 

<td class="tdStyle2"> What learn professional </td> 

<td class="tdStyle2"> Eductional systme </td> 

<td class="tdStyle2"> A degree in </td> 

<td class="tdStyle2"> Learning style </td> 

<td class="tdStyle2"> Level of education </td> 

<td class="tdStyle2"> 
<input type="button" name="LearnAdd" value=" add " onclick="LearnAddSignRow()" /> 
<input name='LearnTRLastIndex' type='hidden' id='LearnTRLastIndex' value="1" /> 
</td> 

</tr> 
</table> 

Javascript code:

 
<script language="javascript" type="text/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; 
} 


//Add a learning resume
function LearnAddSignRow(){ //Read the line number of the last line and store it in the LearnTRLastIndex text box
var LearnTRLastIndex = findObj("LearnTRLastIndex",document); 
var rowID = parseInt(LearnTRLastIndex.value); 

var signFrame = findObj("LearnInfoItem",document); 
//Add the line
var newTR = signFrame.insertRow(signFrame.rows.length); 
newTR.id = "LearnItem" + rowID; 

//Add column: starting and ending time
var newNameTD=newTR.insertCell(0); 
//Add column content
newNameTD.innerHTML = "<input name='txtLearnStartDate" + rowID + "' id='txtLearnStartDate" + rowID + "' type='text' class='inputStyle' />"; 

//Add column: school of graduation
var newNameTD=newTR.insertCell(1); 
//Add column content
newNameTD.innerHTML = "<input name='txtName" + rowID + "' id='txtName" + rowID + "' type='text' class='inputStyle' />"; 

//Add column: major
var newEmailTD=newTR.insertCell(2); 
//Add column content
newEmailTD.innerHTML = "<input name='txtEMail" + rowID + "' id='txtEmail" + rowID + "' type='text' class='inputStyle' />"; 

//Add column: length of schooling
var newTelTD=newTR.insertCell(3); 
//Add column content
newTelTD.innerHTML = "<input name='txtTel" + rowID + "' id='txtTel" + rowID + "' type='text' class='inputStyle' />"; 

//Add column: degree
var newMobileTD=newTR.insertCell(4); 
//Add column content
newMobileTD.innerHTML = "<input name='txtMobile" + rowID + "' id='txtMobile" + rowID + "' type='text' class='inputStyle' />"; 

//Add columns: learn how
var newMobileTD=newTR.insertCell(5); 
//Add column content
newMobileTD.innerHTML = "<input name='txtMobile" + rowID + "' id='txtMobile" + rowID + "' type='text' class='inputStyle' />"; 

//Add column: education level
var newCompanyTD=newTR.insertCell(6); 
//Add column content
newCompanyTD.innerHTML = "<input name='txtCompany" + rowID + "' id='txtCompany" + rowID + "' type='text' class='inputStyle' />"; 


//Add column: delete button
var newDeleteTD=newTR.insertCell(7); 
//Add column content
newDeleteTD.innerHTML = "<div align='center'><input id='txtDel" + rowID + "' type='button' value=' delete ' onclick="LearnDeleteRow('LearnItem" + rowID + "')" class='inputStyle' /></div>"; 

//Push the line number to the next line
LearnTRLastIndex.value = (rowID + 1).toString() ; 
} 
//Deletes the specified row
function LearnDeleteRow(rowid){ 
var signFrame = findObj("LearnInfoItem",document); 
var signItem = findObj(rowid,document); 

//Gets the Index of the row to be deleted
var rowIndex = signItem.rowIndex; 

//Deletes the row specifying Index
signFrame.deleteRow(rowIndex); 

} 

} 
</script> 

Implementation effect:
< img SRC = "border = 0 / / files.jb51.net/file_images/article/201404/201404141507072.gif? 201431415741 ">