填充數據庫值的文本框需要在點擊提交按鈕時重置

Question

我有一個從數據庫值填充的文本框。

<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]; 
              ?>"/> 

我需要重置這個，一旦提交按鈕被點擊。 （此外，當我點擊該按鈕第二次，它會清除文本框。

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

繼續按鈕onclick按鈕查詢

<?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>'; 
}} 
?> 

代碼顯示小計，showSubTotal()

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

此代碼無效，請幫助我

Answer 1

我發現該溶液中，添加的do_onload（ID），以計算其每個刷新後觸發事件loadComplete總（後也刪除）

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

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

而相應地改變所述phpgrid代碼。

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