[英]Pull data from html table using javascript
I have a php website that makes a table using data fetched from a database. 我有一个php网站,它使用从数据库中获取的数据制作表格。 In the table I have a input so that the user can select how many of each item they want to buy.
在表中,我有一个输入,以便用户可以选择要购买的每种商品有多少。 I have successfully made the ids of each input different by concatenating the ids.
通过串联ID,我已经成功地使每个输入的ID不同。
Here is the php that makes the table: 这是制作表格的PHP:
<?php
if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
echo "<tr>";
echo "<td>" . $row['id'] . "</td>";
echo "<td>" . $row['Article'] . "</td>";
echo "<td>" . $row['Prix'] . "</td>";
echo "<td>" . $row['PrixRetour'] . "</td>";
echo "<td>" . $row['QuantiteeMaximale'] . "</td>";
echo "<td>" . $row['Projet'] . "</td>";
echo "<td id=\"quantity" . $row['id'] . "\"><input type=\"number\" name=\"quantity\" id=\"quantity\"></td>";
echo "</tr>";
}
} else {
echo "0 results";
}
$conn->close();
?>
I need to write the total amount at the end of my table, but i don't know how to make a for loop in javascript so that the number in the input field is multiplied by the price. 我需要在表末尾写总金额,但是我不知道如何在javascript中进行for循环,以便输入字段中的数字乘以价格。 Is there an easy part of code that i could use to calculate the grand total price?
我可以使用简单的代码部分来计算总价吗?
You don't need to do this in Javascript. 您无需使用Javascript执行此操作。 You could just do it in your PHP code:
您可以在您的PHP代码中完成此操作:
<?php
if ($result->num_rows > 0) {
$grandTotal = 0;
// output data of each row
while($row = $result->fetch_assoc()) {
$grandTotal += $row['Prix'] * $row['QuantiteeMaximale'];
echo "<tr>";
echo "<td>" . $row['id'] . "</td>";
echo "<td>" . $row['Article'] . "</td>";
echo "<td>" . $row['Prix'] . "</td>";
echo "<td>" . $row['PrixRetour'] . "</td>";
echo "<td>" . $row['QuantiteeMaximale'] . "</td>";
echo "<td>" . $row['Projet'] . "</td>";
echo "<td id=\"quantity" . $row['id'] . "\"><input type=\"number\" name=\"quantity\" id=\"quantity\"></td>";
echo "</tr>";
}
echo "Grand Total: {$grandTotal}"; // you might want to end your table before this. I'll leave formatting up to you.
} else {
echo "0 results";
}
$conn->close();
?>
Also, here's a cleaner way to output your HTML: 另外,这是一种输出HTML的更简洁的方法:
<?php
if ($result->num_rows > 0) {
$grandTotal = 0;
// output data of each row
while($row = $result->fetch_assoc()) {
$grandTotal += $row['Prix'] * $row['QuantiteeMaximale'];
?>
<tr>
<td><?= htmlentities($row['id']); ?></td>
<td><?= htmlentities($row['Article']); ?></td>
<td><?= htmlentities($row['Prix']); ?></td>
<td><?= htmlentities($row['PrixRetour']); ?></td>
<td><?= htmlentities($row['QuantiteeMaximale']); ?></td>
<td><?= htmlentities($row['Projet']); ?></td>";
<td id="quantity<?= $row['id']; ?>"><input type="number" name="quantity"></td>
</tr>
<?php
}
echo "Grand Total: {$grandTotal}"; // you might want to end your table before this. I'll leave formatting up to you.
} else {
echo "0 results";
}
$conn->close();
?>
If you want to use the quantity field in the table itself, you could do something like this. 如果要使用表本身中的数量字段,则可以执行以下操作。 It's a pretty quick solution.
这是一个非常快速的解决方案。 You'd probably want to refine it.
您可能想要对其进行优化。 But it's at least something to work with.
但这至少是可以使用的。
<?php
if ($result->num_rows > 0) {
echo "<table id='items'>";
// output data of each row
while($row = $result->fetch_assoc()) {
$grandTotal += $row['Prix'] * $row['QuantiteeMaximale'];
?>
<tr>
<td><?= htmlentities($row['id']); ?></td>
<td><?= htmlentities($row['Article']); ?></td>
<td><?= htmlentities($row['Prix']); ?></td>
<td><?= htmlentities($row['PrixRetour']); ?></td>
<td><?= htmlentities($row['QuantiteeMaximale']); ?></td>
<td><?= htmlentities($row['Projet']); ?></td>";
<td><input data-price='<?= floatval($row['Prix']); ?>' data-max-quantity='<?= intval($row['QuantiteeMaximale']); ?>' type="number" name="quantity"></td>
</tr>
<?php
}
?>
</table>
<p>Grand Total: $<span id='grandTotal'></span></p>
<script>
(() => {
const updateGrandTotal = (grandTotalEl, inputEls) => {
grandTotalEl.innerText = inputEls.reduce((total, inputEl) => {
const maxQuantity = parseInt(inputEl.dataset.maxQuantity)
if(parseInt(inputEl.value) > maxQuantity) inputEl.value = maxQuantity
if(parseInt(inputEl.value) < 0) inputEl.value = 0
const price = parseFloat(inputEl.dataset.price)
const quantity = parseInt(inputEl.value)
if(isNaN(quantity)) return total
return total + (price * quantity)
}, 0)
}
const tableEl = document.getElementById('items')
const grandTotalEl = document.getElementById('grandTotal')
const quantityInputEls = tableEl.querySelectorAll('input[name=quantity]')
quantityInputEls.forEach(el => el.addEventListener('keyup', () => updateGrandTotal(grandTotalEl, inputEls)))
})()
</script>
<?php
} else {
echo "0 results";
}
$conn->close();
?>
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