How to dynamically add and delete table rows with native JS and JQuery

How to dynamically add and delete table rows with native JS and JQuery_javascript skills

WBOY

Release： 2016-05-16 15:57:23

Original

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The example in this article describes how to dynamically add and delete table rows using native JS and JQuery. Share it with everyone for your reference. The specific analysis is as follows:

The following HTML code functions: Submit a form and submit the value of the check box (the value of the check box is equal to the following text box, the check box and text box are on the same line, and can be added and deleted dynamically).

Original JS version:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>javascript添加行demo</title>
 <script type="text/javascript"> 
 /**验证表单复选框是否有选择*/ 
 function isValidChkSelect(frm){ 
  var chk = frm.chked; 
  if(chk == undefined){ 
  return; 
  } 
  var len = frm.chked.length; 
  if(chk.length == undefined){ 
  // 只有一个checkbox 
  if (chk.checked == true) { 
   return true; 
  } 
  } else { 
  for(var i = 0; i < chk.length; i++) { 
   if (chk[i].checked == true) { 
   return true; 
   } 
  } 
  } 
  return false; 
 } 
 /**选择所有文本框*/ 
 function selectAll(frm){ 
  for (var i = 0; i < frm.elements.length; i++){ 
  var e = frm.elements[i]; 
  if (e.name != 'chkall' && e.type == 'checkbox') 
   e.checked = frm.chkall.checked; 
  } 
 } 
 /**添加新行*/ 
 function addNew(){ 
  var objMyTable = document.getElementById("tbl"); 
  var index = objMyTable.rows.length - 1; 
  var nextRow = objMyTable.insertRow(index);// 插入新行 
  var objCel_0 = nextRow.insertCell(0);// 添加单元格 
  objCel_0.innerHTML = "<input type='checkbox' name='chked' value='' />"; 
  var objCel_1 = nextRow.insertCell(1); 
  // nextRow.rowIndex -- 行索引 
  objCel_1.innerHTML = "<input type='text' name='newRow"+nextRow.rowIndex+"' /> <a href='#' onclick='delRow(this)'>删除</a>"; 
 } 
 /**删除行对象*/ 
 function delRow(obj){ 
  //obj.parentNode.parentNode.removeNode(true); // Firefox不兼容 
  var new_tr = obj.parentNode.parentNode; 
  var tmp = new_tr.parentNode; 
  tmp.removeChild(new_tr); // 删除子节点 
 } 
 /**将文本框值赋给同一行对应的复选框*/ 
 function setValue(obj, obj_chk){ 
  obj_chk.value = obj.value; 
 } 
 function doSubmit(frm){ 
  if(isValidChkSelect(frm) == false){ 
  alert("选择不能少于一项"); 
  return false; 
  } 
  for(var i = 0; i < document.getElementsByTagName("input").length; i++) { 
  var obj = document.getElementsByTagName("input")[i]; 
  if(obj.type == "text" && obj.name.substring(0, 6) == "newRow"){ 
   var obj_chk = obj.parentNode.parentNode.childNodes[0].childNodes[0];// 复选框对象 
   if(valid(obj, obj_chk)){ 
   setValue(obj, obj_chk);// 同一行的文本框值 赋值给 复选框 
   continue; 
   } else { 
   return false; 
   } 
  } 
  } 
  return true; 
 } 
 function valid(obj, obj_chk){ 
  if(obj_chk.checked){ 
  var patrn = /^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/; 
  if(obj.value == ""){ 
   alert("添加的地址不能为空！"); 
   return false; 
  } 
  if(!patrn.test(obj.value)){ 
   alert("请输入正确的邮件地址！"); 
   return false; 
  } 
  } 
  return true; 
 } 
 </script> 
</head> 
<body> 
 <form method="post" action="" onsubmit="return doSubmit(this)"> 
 <table id="tbl" border="1" cellpadding="4" style="border-collapse: collapse" width="100%"> 
  <tr> 
  <td><input type="checkbox" name='chkall' onclick="selectAll(this.form)"/>全部选择</td> 
  <td> 
   允许发送地址 
   <a href="#" onclick="addNew()">添加新地址</a> 
  </td> 
  </tr> 
  <tr> 
  <td> 
   <input type="checkbox" name="chked" value="mailfrom@gmail.com"> 
  </td> 
  <td>mailfrom@gmail.com</td> 
  </tr> 
  <tr> 
  <td colspan="2"> 
   <input type="submit" value="提交" name="B1"> 
  </td> 
  </tr> 
 </table> 
 </form> 
</body> 
</html>

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JQuery version:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>jQuery添加行demo</title>
<script type="text/javascript" src="jquery-1.6.4.min.js"></script> 
<script type="text/javascript"> 
 $("document").ready(function(){ 
  // 全部选择的点击事件 
  $("input[name='chkall']").click(function(){ 
  $("input[name='chked']").attr("checked", this.checked); 
  }); 
 }); 
 var row_cur_index = 0;// 插入行的当前索引 
 /**添加新行*/ 
 function addNew(){ 
  var row_id = "tr" + row_cur_index;// 所插入行的id 
  var row_obj = "<tr id='"+row_id+"'><td><input type='checkbox' class='ck_class' name='chked' value='' /></td><td><input type='text' name='newRow"+row_cur_index+"' /> <a href='#' onclick='delRow("+row_id+")'>删除</a></td></tr>"; 
  $("#topRow").before(row_obj); // 插入行 
  row_cur_index = row_cur_index + 1; 
 } 
 /**将文本框值赋给同一行对应的复选框*/ 
 function setValue(row_index, value){ 
  var row_id = "#tr" + row_index; 
  $(row_id).find(":checked").val(value); 
 } 
 /**删除行对象*/ 
 function delRow(row_id){ 
  $(row_id).remove(); // 删除匹配row_id的元素 
 } 
 function doSubmit(frm){ 
  /**判断复选框是否有选*/ 
  if($("input[name='chked']:checked").size() == 0){ 
  alert("选择不能少于一项"); 
  return false; 
  } 
  try { 
  $("tr[id^='tr']").each(function(){ 
   var tmp_row_index = this.id.substring(2); // 当前行索引 
   if($("#tr"+tmp_row_index).find(":checkbox").attr("checked")){ 
   var patrn = /^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/; 
   var input_value = $("input[name='newRow"+tmp_row_index+"']").val(); // 文本框值 
   setValue(tmp_row_index, this.value);  
   if(input_value == "") throw "Err1"; 
   if (!patrn.test(input_value)) throw "Err2"; 
   } 
  }); 
  } catch (e) { 
   if(e == "Err1") 
   alert("添加的地址不能为空！"); 
  if(e == "Err2") 
   alert("请输入正确的邮件地址！");  
   return false; 
  } 
  return true; 
 } 
 </script> 
</head> 
<body> 
 <form method="post" action="" onsubmit="return doSubmit(this)"> 
 <table id="tbl" border="1" cellpadding="4" style="border-collapse: collapse" width="100%"> 
  <tr> 
  <td><input type="checkbox" name='chkall' />全部选择</td> 
  <td> 
   允许发送地址 
   <a href="#" onclick="addNew()">添加新地址</a> 
  </td> 
  </tr> 
  <tr> 
  <td> 
   <input type="checkbox" name="chked" value="mailfrom@gmail.com"> 
  </td> 
  <td>mailfrom@gmail.com</td> 
  </tr> 
  <tr id="topRow"> 
  <td colspan="2"> 
   <input type="submit" value="提交" name="B1"> 
  </td> 
  </tr> 
 </table> 
 </form> 
</body> 
</html>

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I hope this article will be helpful to everyone’s JavaScript programming design.