我想要做的是每次用户点击按钮添加并调用addRow函数时，我还会调用row_counter函数来设置隐藏输入类型字段的值，该值等于已创建的动态行数。因此，如果我动态创建了3行，则隐藏的输入类型字段必须为3.我是javascript的新手所以请耐心等待。
<?php
// Parse the form data and add inventory item to the system
if (isset($_POST['product_name'])) {
$product_name = mysql_real_escape_string($_POST['product_name']);
$price = mysql_real_escape_string($_POST['counter']);
$details = mysql_real_escape_string($_POST['details']);
$category = mysql_real_escape_string($_POST['category_choice']);
$condition= mysql_real_escape_string($_POST['condition']);;
$supplier_choice= mysql_real_escape_string($_POST['supplier_choice']);;
// See if that product name is an identical match to another product in the system
$sql = mysql_query("SELECT id FROM products WHERE product_name='$product_name' LIMIT 1");
$productMatch = mysql_num_rows($sql); // count the output amount
if ($productMatch > 0) {
echo 'Sorry you tried to place a duplicate "Product Name" into the system, <a href="inventory_list.php">click here</a>';
exit();
}
// Add this product into the database now
$sql = mysql_query("INSERT INTO products (product_name, price, details, category, active, supplier, date_added)
VALUES('$product_name','$price','$details','$category','$condition','$supplier_choice',now())") or die (mysql_error());
$pid = mysql_insert_id();
// Place image in the folder
$newname = "$pid.jpg";
move_uploaded_file( $_FILES['my_photo']['tmp_name'], "../inventory_images/$newname");
//ean den yperxan oi 2 epomenes grammes ean ekana refresh tha prospathouse na perasei to idio proion ksana!!
header("location: inventory_list.php");
exit();
}
＆GT;
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Inventory Area</title>
<link rel="stylesheet" href="../style/style.css" type="text/css" media="screen"/>
<SCRIPT language="javascript">
//Add Information
i=1;
function addRow(tableID,counter1) {
//The rows num starts from 0
var table = document.getElementById(tableID);
var rowCount = 7;
var row = table.insertRow(rowCount);
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
var element = document.createElement("input");
element.type = "text";
element.name = "information_" + i;
element.id = "information_" + i;
element.size = 84;
cell2.appendChild(element);
i++;
row_counter_inc(counter1);
}
function deleteRow(tableID) {
if(i>=2){
var table = document.getElementById(tableID);
table.deleteRow(i+5);
i--;
}
}
function row_counter_inc(counter2){
w=i;
w=w-1
document.getElementByID("counter2").value=w;
}
</SCRIPT>
<div align="center" id="mainWrapper">
<?php include_once("template_header.php");?>
<div id="pageContent">
<div align="left" style="margin-left:24px">
<h2>Inventory List</h2>
<?php echo $productList ?>
</div>
</div>
<div>
<form action="inventory_list.php" enctype="multipart/form-data" name="my_Form" id="my_Form" method="post">
<a name="add_New_Product_Form" id="add_New_Product_Form">
<h2>Add New Product Form</h2>
</a>
<table width="80%" border="0" cellspacing="0" cellpadding="6" id="dataTable">
<tr>
<td>Όνομα</td>
<td>
<label>
<input name="product_name" type="text" id="product_name" size="80" />
</label>
</td>
</tr>
<tr>
<td>Κατάσταση</td>
<td>
<label>
<input type="radio" name="condition" value="1"> Ενεργό</input>
<input type="radio" name="condition" value="0"> Ανενεργό</input>
</label>
</td>
</tr>
<tr>
<td>Τιμή</td>
<td>
<label>
<input name="price" type="text" id="price" size="20" />
</label>
</td>
</tr>
<tr>
<td>Προμηθευτές</td>
<td>
<?php echo $suppliers_list; ?>
</td>
</tr>
<tr>
<td>Κατηγορία</td>
<td>
<?php echo $category_list; ?>
</td>
</tr>
<tr>
<td>Περιγραφή</td>
<td>
<label>
<textarea name="details" id="details" cols="64" rows="5"></textarea>
</label>
</td>
</tr>
<tr>
<td>Τεχνικά Χαρακτηριστικά</td>
<td>
<input type="text" name="information_0" id="information_0" size="84"/>
</td>
</tr>
<tr>
<td></td>
<td>
<input type="hidden" name="counter" id="counter"/>
<INPUT type="button" value="Προσθήκη" onClick="addRow('dataTable','counter')"/>
<INPUT type="button" value="Αφαίρεση" onClick="deleteRow('dataTable')"/>
</td>
</tr>
<tr>
<td>Φωτογραφία</td>
<td>
<label>
<input type="file" name="my_photo" id="my_photo"/>
</label>
</td>
</tr>
<tr>
<td> </td>
<td>
<label>
<input type="submit" name="button" id="button" value="Αποθήκευση" />
</label>
</td>
</tr>
</table>
</form>
</div>
<br /><br />
<?php include_once("../template_footer.php");?>
</div>
enter code here
答案 0 :(得分：4)
这应该适合你：
document.getElementById("counter").value = 3;