我在表格行的每个单元格上都有一个下拉列表。现在我需要的是通过按下添加按钮在特定单元格上动态添加更多下拉列表。有什么代码片段可以帮助解决这个问题吗？谢谢。 以下是代码。我已经尝试过函数addSubRow2，但这是非常静态的，我无法进一步移动，因为在每个组合框旁边我还需要一个文本框，如何给每个人一个唯一的ID，以便以后我可以在验证和提交到php页面时识别？ / p>
<html>
<head>
<script language="javascript">
function addRow(tableID) {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
var row = table.insertRow(rowCount);
var colCount = table.rows[0].cells.length;
for(var i=0; i<colCount; i++) {
var newcell = row.insertCell(i);
newcell.innerHTML = table.rows[1].cells[i].innerHTML;
newcell.innerHTML = newcell.innerHTML +"<br> TEST";
//alert(newcell.childNodes[2].type);
/*switch(newcell.childNodes[0].type) {
case "text":
newcell.childNodes[0].value = "";
newcell.childNodes[0].id = "input" + rowCount;
break;
case "checkbox":
newcell.childNodes[0].checked = false;
newcell.childNodes[0].id = "checkbox" + rowCount;
break;
case "select-one":
newcell.childNodes[1].selectedIndex = 0;
newcell.childNodes[1].id = "col_" + rowCount+"_2";
break;
}*/
/*if(newcell.childNodes[0].type=="button")
{
alert("TEST");
newcell.childNodes[0].id=rowCount;
}*/
}
/*var table = document.getElementById(tableID);
var rows = table.getElementsByTagName('tr');
for (var i = 0, row; row = table.rows[i]; i++) {
row.id="row"+i;
row.name="row"+i;
var rowName = "row"+i;
//iterate through rows
//rows would be accessed using the "row" variable assigned in the for loop
for (var j = 0, col; col = row.cells[j]; j++) {
//iterate through columns
//columns would be accessed using the "col" variable assigned in the for loop
col.id="col_"+i+"_"+j;
col.name="col_"+i+"_"+j;
var cels = rows[i].getElementsByTagName('td')[j];
var realKids = 0,count = 0;
kids = cels.childNodes.length;
while(count < kids){
if(cels.childNodes[i].nodeType != 3){
realKids++;
}
count++;
}
///alert("I : "+i+" "+"J : "+j+" "+"realKids :"+cels.childElementCount);
//alert();
for(var k=0 ; k<cels.childElementCount ; k++)
{
alert("J :"+j+" "+"K :"+k+" "+cels.childNodes[k].type);
}
}
}*/
}
function addSubRow2(cell){
var dropdown = "<SELECT class=\"select\" name=\"country\">\n" +
"<OPTION value=\"1\">Serial 1<\/OPTION>\n" +
"<OPTION value=\"2\">Serial 2<\/OPTION>\n" +
"<OPTION value=\"3\">Serial 3<\/OPTION>\n" +
"<OPTION value=\"4\">Serial 4<\/OPTION>" +
"<OPTION value=\"5\">Serial 5<\/OPTION>" +
"<\/SELECT>";
//var dropdown = document.getElementById("dataTable").rows[0].cells[2].childNodes[1].cloneNode(true);
cell.innerHTML += "<br\/ >" + dropdown;
}
/*alert("COLD ID : "+colID);
var tdID = document.getElementById(colID);
var table = document.getElementById(tableID);
var new_comboBox = table.rows[0].cells[2].childNodes[2].cloneNode(true);
tdID.appendChild(new_comboBox);*/
function deleteRow(tableID) {
try {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
for(var i=0; i<rowCount; i++) {
var row = table.rows[i];
var chkbox = row.cells[0].childNodes[0];
if(null != chkbox && true == chkbox.checked) {
if(rowCount <= 1) {
alert("Cannot delete all the rows.");
break;
}
table.deleteRow(i);
rowCount--;
i--;
}
}
var table = document.getElementById(tableID);
for (var i = 0, row; row = table.rows[i]; i++) {
row.id="row"+i;
//iterate through rows
//rows would be accessed using the "row" variable assigned in the for loop
for (var j = 0, col; col = row.cells[j]; j++) {
//iterate through columns
//columns would be accessed using the "col" variable assigned in the for loop
//alert("J : "+j);
col.id="col"+i;
if(j==0)
{
}
else if(j==1)
{
}
}
}
}catch(e) {
alert(e);
}
}
</script>
</head>
<body>
Begin Location : <select class='select' id="beginLocation" name="beginLocation">
<option value="1">Loc 1</option>
<option value="2">Loc 2</option>
<option value="3">Loc 3</option>
<option value="4">Loc 4</option>
<option value="5">Loc 5</option>
</select>
<p type="text" class=error id='beginLocation_Error'>
<br\>
<input type="button" value="Add Row" onclick="addRow('dataTable')" />
<input type="button" value="Delete Row" onclick="deleteRow('dataTable')" />
<table id="dataTable" width="350px" border="1">
<tr>
<th></th>
<th>Client</th>
<th>Location</th>
<th>Serial</th>
</tr>
<tr>
<td id="col_0_0"><input type="checkbox" name="chk"/></td>
<td id="col_0_1">
<select class='select' id="client1" name="client1">
<option value="1">Client 1</option>
<option value="2">Client 2</option>
<option value="3">Client 3</option>
<option value="4">Client 4</option>
<option value="5">Client 5</option>
</select><p type="text" class=error id='client_0_Error'>
</td>
<td id="col_0_1">
<select class='select' id="location1" name="location1">
<option value="1">Loc 1</option>
<option value="2">Loc 2</option>
<option value="3">Loc 3</option>
<option value="4">Loc 4</option>
<option value="5">Loc 5</option>
</select>
<p type="text" class=error id='beginLocation_Error'>
</td>
<td id="col_0_3">
<input type="button" value="Add Serial" onclick="addSubRow2(this.parentNode);" />
<br\>
<select class='select' id="serial_0_1" name="serial_0_1">
<option value="1">Serial 1</option>
<option value="2">Serial 2</option>
<option value="3">Serial 3</option>
<option value="4">Serial 4</option>
<option value="5">Serial 5</option>
</select><input type="text" name=txtLoc" id="txtLoc><p type="text" class=error id='serial_0_1_Error'>
</td>
</tr>
</table>
</body>
</html>
答案 0 :(得分：3)
试试这个 - DEMO
的 JS 的
var i = 0;
var option;
document.getElementById("add").addEventListener("click", addSelect, false);
function addSelect() {
var select = document.createElement("select");
select.setAttribute("name", "mySelect" + i);
select.setAttribute("id", "mySelect" + i);
option = document.createElement("option");
option.setAttribute("value", "value one");
option.innerHTML = "ONE";
select.appendChild(option);
option = document.createElement("option");
option.setAttribute("value", "value two");
option.innerHTML = "TWO";
select.appendChild(option);
document.getElementById("wrapper").appendChild(select);
i++;
}