用javascript遍历table里的checkbox状态？？？

Question

javascript比较好的前辈帮我看看
<table id="table1">
    <tr>
        <td> <input ID="checkboxname" name="checkboxname" type="checkbox" value='111' /></td>
    </tr>
    <tr>
        <td> <input ID="checkboxname" name="checkboxname" type="checkbox" value='222' /></td>
    </tr>
    <tr>
        <td> <input ID="checkboxname" name="checkboxname" type="checkbox" value='33' /></td>
    </tr>
    <tr>
        <td> <input ID="checkboxname" name="checkboxname" type="checkbox" value='33' /></td>
    </tr>
</table>
<table id="table2">
    <tr>
        <td> <input ID="checkboxname" name="checkboxname" type="checkbox" value='55' /></td>
    </tr>
    <tr>
        <td> <input ID="checkboxname" name="checkboxname" type="checkbox" value='55 /></td>
    </tr>
    <tr>
        <td> <input ID="checkboxname" name="checkboxname" type="checkbox" value='225' /></td>
    </tr>
    <tr>
        <td> <input ID="checkboxname" name="checkboxname" type="checkbox" value='545' /></td>
    </tr>
</table>能否这样写：我只想获取table1里面的第一列里的checkbox的状态，其他的不用获取！谢谢！

Answer 1

将你的id改成唯一,如:
        <table id="table1">
            <tr>
                <td>
                    <input id="checkboxname1" name="checkboxname" type="checkbox" value='111' />
                </td>
            </tr>
            <tr>
                <td>
                    <input id="checkboxname2" name="checkboxname" type="checkbox" value='222' />
                </td>
            </tr>
            <tr>
                <td>
                    <input id="checkboxname3" name="checkboxname" type="checkbox" value='33' />
                </td>
            </tr>
            <tr>
                <td>
                    <input id="checkboxname4" name="checkboxname" type="checkbox" value='33' />
                </td>
            </tr>
        </table>
        <table id="table2">
            <tr>
                <td>
                    <input id="checkboxname5" name="checkboxname" type="checkbox" value='55' />
                </td>
            </tr>
            <tr>
                <td>
                    <input id="checkboxname6" name="checkboxname" type="checkbox" value='55' />
                </td>
            </tr>
            <tr>
                <td>
                    <input id="checkboxname7" name="checkboxname" type="checkbox" value='225' />
                </td>
            </tr>
            <tr>
                <td>
                    <input id="checkboxname8" name="checkboxname" type="checkbox" value='545' />
                </td>
            </tr>
        </table>js获取:
        function test() {
            var str = "";
            for (var i = 1; i < 9; i++) {
                id = "checkboxname" + i;
                if (document.getElementById(id).checked == true) {
                    str += document.getElementById(id).value + "/";
                }
            }
            alert("你选中的value为" + str);
        }

Answer 2

能否先获取table1，然后再获取里面的控件信息

Answer 3

var options = document.getElementByID("table1").getElementsByTagName("input");
for(var i = 0; i < options.length;++i)
{
if(i % 4 == 0)
{
alert(options[i].checked);
}
}

Answer 4

var chks = document.getElementById("table1").getElementsByTagName("input");
for(var i = 0; i < chks.length; i++)
{
alert(chks[i].checked));
}

Answer 5

var chks = document.getElementById("table1").getElementsByTagName("input");
var c;
for(var i = 0; i < chks.length; i++)
{
  c = chks[i].checked;
  break;
}
alert(c);

Answer 6

var el=document.getElementById("table1").getElementsByTagName("input");        
        for(var i=0;i<el.length;i++)
        {
            if((el[i].type=='checkbox')&&(el[i].checked))
            {
                var s=el[i].vlaue;
            }
        }

Answer 7

function text()
        {
            var str="";
            alert(str);
            for(var i=1;i<9;i++)
            {
               id="checkboxname"+i;
            
//            alert(id);
            if(document.getElementById(id).checked==true)
            {
               str +=document.getElementById(id).value+"/";
               
            }
            }
            alert("你选中的value为" + str);        }