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javascript - 通过 javascript 传递 id 和 name

转载 作者:行者123 更新时间:2023-12-03 03:39:08 26 4
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嗨,我在 javascript 方面没有太多专业知识,在我的代码中,我有“添加项目”和“删除项目”按钮,该按钮工作正常。第一行对于总计算功能工作正常,但其余行无法工作,因为我无法为创建的行分配不同的名称和 ID。我如何重用 JavaScript。另请让我知道如何使用 POST 方法或此代码接收提交数据,以及如何查找我在表底部插入的所有行的总数。提前致谢

<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="css/default.css"/>
<script type="text/javascript" src="add_rows.js"></script>
<script>
function func()
{
var w = document.getElementById("qty").value;
var x = document.getElementById("price").value;
var z = document.getElementById("total");
z.value = Number(w)*Number(x);
}
</script>
</head>
<body>
<fieldset class="row2">
<legend>Catering Order Details</legend>
<p>
<input type="button" value="Add Items" onClick="addRow('dataTable')" />
<input type="button" value="Remove Items" onClick="deleteRow('dataTable')" />
</p>

<table id="dataTable" class="form" border="1">
<tbody>
<tr>
<p>
<td><input type="checkbox" required="required" name="chk[]" /></td>
<td>
<label>Item</label>
<select size="1" name="Item[]" required="required" >
<?php
echo "<option value=''>---Choose Item---</option>";
$q=mysqli_query($dbConnect1,"SELECT DISTINCT ITEM as Item, ITEM_ID FROM `manage_item`");
while($r=mysqli_fetch_assoc($q))
{
$i=$r['ITEM_ID'];
$n=$r['Item'];
echo "<option value='$i'> $n</option>";
}
?>
</select>
</td>
<td>
<label>Quantity</label>
<input type="text" required="required" name="Qty[]" id="qty" value="">
</td>
<td>
<label>Price/Quantity</label>
<input type="text" required="required" name="Price[]" id="price" value="" onChange="func()">
</td>
<td>
<label>Total</label>
<input type="text" required="required" name="Total[]" id="total" value="">
</td>
</p>
</tr>
</tbody>
</table>
<div class="clear"></div>
</fieldset>
</div>
</body>
</html>

这是我的脚本

function addRow(tableID) {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
if(rowCount < 100){
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[0].cells[i].innerHTML;
}
}else{
alert("Maximum items is 100.");

}
}

function deleteRow(tableID) {
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 Remove all the Items.");
break;
}
table.deleteRow(i);
rowCount--;
i--;
}
}
}

最佳答案

您可以将它们更改为类名,而不是使用 ID,如下所示:

<input type="text" required="required"  name="Qty[]" class="qty" value="" oninput="func(this)">

因为您使用内联事件,您可以:

  • use input event because the DOM input event is fired synchronously when the value of an <input>, <select>, or <textarea> element is changed.
  • this 作为内联函数的参数:它将是当前元素

因此,将您的func更改为:

function func(ele) {
var parentRow = ele.parentNode.parentNode;
var w = parentRow.querySelector('input.qty').value;
var x = parentRow.querySelector('input.price').value;
var z = parentRow.querySelector('input.total');
z.value = Number(w)*Number(x);
}

this 参数现在是 ele 当前元素。您现在可以获取父行并使用类和 querySelector您可以找到所有元素。

代码片段:

function updateGrandTotal() {
var gt = document.querySelector('input.grantotal');
gt.value = 0;
document.querySelectorAll('input.total').forEach(function(ele, idx) {
gt.value = +gt.value + +ele.value;
});
}
function func(ele) {
var parentRow = ele.parentNode.parentNode;
var w = parentRow.querySelector('input.qty').value;
var x = parentRow.querySelector('input.price').value;
var z = parentRow.querySelector('input.total');
z.value = Number(w)*Number(x);
updateGrandTotal();
}
function addRow(tableID) {
var table = document.getElementById(tableID);
var rowCount = table.rows.length -1;
if(rowCount < 100){
var row = table.insertRow(rowCount + 1);
var colCount = table.rows[1].cells.length;
for(var i=0; i<colCount; i++) {
var newcell = row.insertCell(i);
newcell.innerHTML = table.rows[1].cells[i].innerHTML;
}
}else{
alert("Maximum items is 100.");

}
}

function deleteRow(tableID) {
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 Remove all the Items.");
break;
}
table.deleteRow(i);
rowCount--;
i--;
}
}
updateGrandTotal();
}
<fieldset class="row2">
<legend>Catering Order Details</legend>
<p>
<input type="button" value="Add Items" onClick="addRow('dataTable')" />
<input type="button" value="Remove Items" onClick="deleteRow('dataTable')" />
</p>

<table id="dataTable" class="form" border="1">
<thead>
<tr>
<td></td>
<td></td>
<td></td>
<td></td>
<td>
<label>Grand Total</label>
<input type="text" required="required" name="Total[]" class="grantotal" value=""></td>
</tr>
</thead>
<tbody>
<tr>
<p>
<td><input type="checkbox" required="required" name="chk[]" /></td>
<td>
<label>Item</label>
<select size="1" name="Item[]" required="required" >
<option value=''>---Choose Item---</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</td>
<td>
<label>Quantity</label>
<input type="text" required="required" name="Qty[]" class="qty" value="" oninput="func(this)">
</td>
<td>
<label>Price/Quantity</label>
<input type="text" required="required" name="Price[]" class="price" value="" oninput="func(this)">
</td>
<td>
<label>Total</label>
<input type="text" required="required" name="Total[]" class="total" value="">
</td>
</p>
</tr>
</tbody>
</table>
<div class="clear"></div>
</fieldset>

关于javascript - 通过 javascript 传递 id 和 name,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45714421/

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