javascript - 单击提交按钮时需要重置填充数据库值的文本框

Question

我有一个从数据库值填充的文本框。

<form id="manageSalesForm" name="manageSalesForm" method="post" action="<?php echo BASE_URL?>includes/functions/sales_functions.php">

<input name="txtSubTotal" type="text" id="txtSubTotal" size="15" value="<?php 
                                            $sql=mysqli_query($connection,'select sum(amount) from sales_temp');
                                            $row = mysqli_fetch_array($sql);
                                            echo $row[0];
                                            ?>"/>

单击提交按钮后，我需要重置此设置。 (此外，当我第二次单击该按钮时，它会清除文本框。

<input type="submit" name="btnProceed" id="btnProceed" value="PROCEED" onclick="document.getElementById('txtSubTotal').value = '';"/>

继续按钮查询

<?php

//Start the Session
       if(!isset($_SESSION)) 
       { 
           session_start(); 
       } 

include ("/../../pages/sales.php");
include("/../../dbutil.php");

if(isset($_POST['listCustomer'])){ $customer = $_POST['listCustomer'];}
if(isset($_POST['staff'])){ $user = $_POST['staff']; }
if(isset($_POST['txtReceiptNo'])){ $receipt_no = $_POST['txtReceiptNo']; } 
if(isset($_POST['txtSubTotal'])){ $subTotal = $_POST['txtSubTotal']; } 

if(isset($_POST['btnProceed'])){


$result=mysqli_query($connection, 
"INSERT INTO sales(cus_id,item_id,stock_id,receipt_no,qty,unit_price,amount,user_id,purchase_id) 
SELECT C.cus_id, I.item_id, S.stock_id, $receipt_no, ST.qty, ST.unit_price, ST.amount, U.id, P.purchase_id 
FROM customers C, items I, stock S, sales_temp ST, users U, purchase_items P 
WHERE ST.staff='$user' 
AND C.customer_name='$customer' 
AND I.item_name=ST.item_name 
AND S.stock_code=ST.stock_code 
AND ST.purchase_id=P.purchase_id");


//Update available qty from purchase_items relevant only to the logged in user(sales_temp table may have records from multiple users)
$resultUpdate=mysqli_query($connection, "UPDATE purchase_items P INNER JOIN sales_temp ST ON (P.purchase_id = ST.purchase_id) SET P.avail_qty = (P.avail_qty - ST.qty) WHERE ST.staff='$user'");

//Delete records relevant only to current user. Here 'WHERE' clause use to prevent deleting other user's records.
$resultDelete=mysqli_query($connection, "DELETE FROM sales_temp WHERE staff='$user'");


if (!$result) {
  printf("Errormessage: %s\n", mysqli_error($connection));
}

// use exec() because no results are returned
if ($result) {

/*echo '<script type="text/javascript">',
 'salesAddSuccess();',
'</script>';*/
}
else
{
  echo '<script type="text/javascript">',
 'salesAddFail();',
'</script>';
}}
?>

用于显示小计的按钮onclick代码，showSubTotal()

<button type="button" name="btnSave" id="btnSave" onclick="submitdata(); check_qty(); showSubTotal();">ADD</button>

此代码不起作用。请帮我。

Answer 1

我找到了解决方案，添加了 do_onload(id) 来计算每次刷新后(也在删除后)触发的 loadComplete 事件的总数

function do_onload(id)
{
//alert('Simulating, data on load event')

var s = $("#list").jqGrid('getCol', 'amount', false, 'sum');
jQuery("#txtSubTotal").val(s);
}

并相应地更改了 phpgrid 代码。

$opt["loadComplete"] = "function(ids) { do_onload(ids); }";
$grid->set_options($opt);