js循环

Question

<table width="768" border="0" align="center" cellpadding="2" cellspacing="1" bgcolor="#CCCCCC">
            <tr bordercolor="#E0E0E0" bgcolor="#E0E0E0"> 
              <td width="34%" height="25"><div align="center"><font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"><strong>Product 
                  Name</strong></font></div></td>
              <td width="29%" height="25"><div align="center"><font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"><strong>Item 
                  Code</strong></font></div></td>
              <td width="18%" height="25"><div align="center"><font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"><strong>Qty.</strong></font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName1" id ="txtName1" type="text"  
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode1" id ="txtCode1" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty1" id ="txtQty1" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName2" id ="txtName2" type="text" 
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode2" id ="txtCode2" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty2" id ="txtQty2" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName3" id ="txtName3" type="text" 
                      style=font-family:"verdana";font-size:10px size="40">
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode3" id ="txtCode3" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty3" id ="txtQty3" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName4" id ="txtName4" type="text" 
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode4" id ="txtCode4" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty4" id ="txtQty4" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName5" id ="txtName5" type="text" 
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode5" id ="txtCode5" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty5" id ="txtQty5" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName6" id ="txtName6" type="text" 
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode6" id ="txtCode6" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty6" id ="txtQty6" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
          </table>这个是个表格，我想判断里面的text不能为空，最好是用循环！谢谢！希望大家提出很好的方法帮助一下！

Answer 1

LZ 是想要判断所有的 text 都不为空吗？

Answer 2

var put = document.getElementsByName('input');for(var i=0;i<put.length;i++){
    if( put[i].value == "" ){
        //alert( put[i].value );
    }
}

Answer 3

不可以用这个，万一我的页面又添加了其他的input，那不是乱了吗？

Answer 4

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<script >
window.onload = function(){
var texts = document.getElementsByTagName('input');
for(i=0;i<texts.length;i++){
texts[0].onblur = function(){
alert('此项不能为空!');
}
}
}
</script>
</HEAD><BODY>
<table width="768" border="0" align="center" cellpadding="2" cellspacing="1" bgcolor="#CCCCCC">
            <tr bordercolor="#E0E0E0" bgcolor="#E0E0E0"> 
              <td width="34%" height="25"><div align="center"><font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"><strong>Product 
                  Name</strong></font></div></td>
              <td width="29%" height="25"><div align="center"><font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"><strong>Item 
                  Code</strong></font></div></td>
              <td width="18%" height="25"><div align="center"><font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"><strong>Qty.</strong></font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName1" id ="txtName1" type="text"  
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode1" id ="txtCode1" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty1" id ="txtQty1" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName2" id ="txtName2" type="text" 
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode2" id ="txtCode2" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty2" id ="txtQty2" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName3" id ="txtName3" type="text" 
                      style=font-family:"verdana";font-size:10px size="40">
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode3" id ="txtCode3" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty3" id ="txtQty3" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName4" id ="txtName4" type="text" 
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode4" id ="txtCode4" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty4" id ="txtQty4" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName5" id ="txtName5" type="text" 
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode5" id ="txtCode5" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty5" id ="txtQty5" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName6" id ="txtName6" type="text" 
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode6" id ="txtCode6" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty6" id ="txtQty6" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
          </table>
</BODY>
</HTML>

Answer 5

用 var input = document.getElementsByTagName（"input"）

Answer 6

请注意，我页面万一哪天又加了其他的input控件之类的，那不是乱了吗？

Answer 7

<!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 type="text/javascript">
function checkText(){
var txt = document.getElementById("txtContainer").getElementsByTagName("input");
for(var i = 0; i < txt.length; i++){
if(txt[i].value != ""){
alert("OK");
return;
}
}
alert("请至入输入一个!");
}
  </script>
 </HEAD> <BODY>
  <table width="768" border="0" align="center" cellpadding="2" cellspacing="1" bgcolor="#CCCCCC" id="txtContainer">
            <tr bordercolor="#E0E0E0" bgcolor="#E0E0E0"> 
              <td width="34%" height="25"><div align="center"><font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"><strong>Product 
                  Name</strong></font></div></td>
              <td width="29%" height="25"><div align="center"><font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"><strong>Item 
                  Code</strong></font></div></td>
              <td width="18%" height="25"><div align="center"><font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"><strong>Qty.</strong></font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName1" id ="txtName1" type="text"  
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode1" id ="txtCode1" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty1" id ="txtQty1" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName2" id ="txtName2" type="text" 
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode2" id ="txtCode2" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty2" id ="txtQty2" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName3" id ="txtName3" type="text" 
                      style=font-family:"verdana";font-size:10px size="40">
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode3" id ="txtCode3" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty3" id ="txtQty3" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName4" id ="txtName4" type="text" 
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode4" id ="txtCode4" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty4" id ="txtQty4" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName5" id ="txtName5" type="text" 
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode5" id ="txtCode5" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty5" id ="txtQty5" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
            <tr bordercolor="#FFFFFF" bgcolor="#FFFFFF"> 
              <td height="25"> <div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtName6" id ="txtName6" type="text" 
                      style=font-family:"verdana";font-size:10px size="40" >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtCode6" id ="txtCode6" type="text" size="20" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
              <td height="25"><div align="center"> <font color="#333333" size="1" face="Verdana, Arial, Helvetica, sans-serif"> 
                  <input name="txtQty6" id ="txtQty6" type="text" size="10" 
                      style=font-family:"verdana";font-size:10px >
                  </font></div></td>
            </tr>
          </table> <input type="button" onclick="checkText()" value="检测"/>
 </BODY>
</HTML>

Answer 8

可以判断对象的type属性嘛

Answer 9

不可以，不是说了会加其他的text了吗？？？

Answer 10

var input = document.getElementsByTagName（"input"）var put = input["type='text'"];for(var i=0;i<put.length;i++){
  if( put[i].value == "" ){
  //alert( put[i].value );
  }
}

Answer 11

说了几百遍了，不能用getElementsByTagName，看了我的回复吗？？？

Answer 12

   function checkText()
{
var inputs = document.getElementsByTagName("input");
for(var i = 0; i < inputs.length; i++){
            if(inputs[i].type=="text" && inputs[i].value == ""){
                alert("不能为空！");
                return;
            }
        }}这可以判断任何一个text不能为空的情况

Answer 13

---jQuery---,先自已找到table 的DOM对象,(未测试)$(':text',tableDOMOBj).each(function(){
     if(!$.trim(this.value))
     {
       alert('empty')
       return false
     }else
       return true
})

Answer 14

<table id="tab" width="768" border="0" align="center" cellpadding="2" cellspacing="1" bgcolor="#CCCCCC">
<tr bordercolor="#E0E0E0" bgcolor="#E0E0E0">
  <td width="34%" height="25" align="center" style=font-family:"verdana";font-size:10px><strong>Product Name</strong></td>
  <td width="29%" height="25" align="center" style=font-family:"verdana";font-size:10px><strong>Item Code</strong></td>
  <td width="18%" height="25" align="center" style=font-family:"verdana";font-size:10px><strong>Qty.</strong></td>
</tr>
<tr bordercolor="#FFFFFF" bgcolor="#FFFFFF">
  <td height="25" align="center"><input name="txtName1" id="txtName1" type="text" size="40"></td>
  <td height="25" align="center"><input name="txtCode1" id="txtCode1" type="text" size="20"></td>
  <td height="25" align="center"><input name="txtQty1" id="txtQty1" type="text" size="10"></td>
</tr>
<tr bordercolor="#FFFFFF" bgcolor="#FFFFFF">
  <td height="25" align="center"><input name="txtName2" id="txtName2" type="text" size="40"></td>
  <td height="25" align="center"><input name="txtCode2" id="txtCode2" type="text" size="20"></td>
  <td height="25" align="center"><input name="txtQty2" id="txtQty2" type="text" size="10"></td>
</tr>
</table>
<INPUT TYPE="button" VALUE="try" ONCLICK="test()">
<SCRIPT LANGUAGE="JavaScript">
<!--
function test(){
var flag = false;
var tab = document.getElementById("tab");
for (var i=0; i<tab.rows.length; i++){
for (var j=0; j<tab.rows[i].cells.length; j++){
var obj = tab.rows[i].cells[j].childNodes[0];
if (obj.type == "text" && obj.value){
flag = true;
break;
}
}
}
if (!flag) alert("至少填写一个");
}
//-->
</SCRIPT>

Answer 15

jquery 表单插件最适合你了

Answer 16

for(var i=0;i<document.getElementById("tab").rows.length;i++)
{
    var txtName,txtCode,txtQty;
    txtName ="txtName"+i;
    txtCode ="txtCode"+i;
    txtQty  ="txtQty" +i;
    if(document.getElementById(txtName ).value==""||document.getElementById(txtName ).value==null)
    {
       alert("第"+i+"个为空值");
    }
    if(...){...}
    if（....）{...}
}

Answer 17

LZ,你清楚getElementsByName与getEelementsByTagName的差别吗？它们是不一样的，用第一个就可以了，你需要的是在需要验证的里面加上name=""就可以了

Answer 18

<table id="tab" width="768" border="0" align="center" cellpadding="2" cellspacing="1" bgcolor="#CCCCCC">
<tr bordercolor="#E0E0E0" bgcolor="#E0E0E0">
  <td width="34%" height="25" align="center" style=font-family:"verdana";font-size:10px><strong>Product Name</strong></td>
  <td width="29%" height="25" align="center" style=font-family:"verdana";font-size:10px><strong>Item Code</strong></td>
  <td width="18%" height="25" align="center" style=font-family:"verdana";font-size:10px><strong>Qty.</strong></td>
</tr>
<tr bordercolor="#FFFFFF" bgcolor="#FFFFFF">
  <td height="25" align="center"><input name="txtName1" id="txtName1" type="text" size="40"></td>
  <td height="25" align="center"><input name="txtCode1" id="txtCode1" type="text" size="20"></td>
  <td height="25" align="center"><input name="txtQty1" id="txtQty1" type="text" size="10"></td>
</tr>
<tr bordercolor="#FFFFFF" bgcolor="#FFFFFF">
  <td height="25" align="center"><input name="txtName2" id="txtName2" type="text" size="40"></td>
  <td height="25" align="center"><input name="txtCode2" id="txtCode2" type="text" size="20"></td>
  <td height="25" align="center"><input name="txtQty2" id="txtQty2" type="text" size="10"></td>
</tr>
</table>
<INPUT TYPE="button" VALUE="try" ONCLICK="test()">
<SCRIPT LANGUAGE="JavaScript">
<!--
function test(){
    var flag = false;
    var tab = document.getElementById("tab");
    for (var i=0; i<tab.rows.length; i++){
var n = 0;
        for (var j=0; j<tab.rows[i].cells.length; j++){
            var obj = tab.rows[i].cells[j].childNodes[0];
            if (obj.type == "text" && obj.value) n++;
        }
if (n == tab.rows[i].cells.length){
flag = true;
break;
}
    }
    if (!flag) alert("至少填写一行");
    else alert("合格！");
}
//-->
</SCRIPT>

Answer 19

var put = document.getElementsByName('input');for(var i=0;i<put.length;i++){
  if( put[i].type=='text'&&put[i].value =='' ){
    alert( put[i].id+"不能为空!" );
  }
}