$ .post到PHP文件 - 回调没有被击中，直到包含循环结束？

Question

I'm making a stock table, where the user can input a number of stock to issue out, and this function is to verify, for each member of the table, whether or not the quantity of stock in the database is sufficient to make the issue.

When I breakpoint through the code on Chrome, it seems to never hit the inside code of the $.post until after its finished looping through the table. And by then the data that is supposed to be passed to AddIssue just becomes 1 and 10 and nothing else.

It's starting to drive me mad, so I'd appreciate a pointer on what I'm doing wrong here

var issueArray =[];

function VerifyIssue()
{
    var numRows = document.getElementById("searchTable").rows.length - 2;
    var running = true;

    var str1 = "issue_";

    while(running == true)
    {
        if (numRows < 0 && running == true)
        {
            running = false;
            //insert code for success
            break;
        }
        else if (running == false)
        {
            break;
        }

        var str2 = numRows;
        var comb = str1.concat(str2);
        var issue_element = document.getElementById(comb);
        var q = issue_element.value;


        var i = issue_element.name;
        var idd = i.replace("issue_", "");
        var trimId = idd.trim();

        $.post
        (
            'includes/issueCheck.php',
            {
                id: trimId, 
                issueQuantity: q 
            },
            function(result)
            {
                alert(result);

                if (result < 0)
                {
                    alert("One of more quantities inputted are greater than held in stock");
                    running = false;
                }
                if (result > 0)
                {
                    addIssue(trimId, q);
                }
            }
        );
        numRows = numRows - 1;
    }
    alert(issueArray);
}

function addIssue(issueID, quant)
{
    var item = {};

    item.label = issueID;
    item.value = quant;
    issueArray.push(item);

}

This is the PHP that is called by the $.post

<?php
    $server = 'SQL2008';
    $connectionInfo = array( "Database"=>"rde_470585");
    $conn = sqlsrv_connect($server,$connectionInfo);

    $false = -1;
    $true = 1;
    $id = $_POST['id'];
    $quantity = $_POST['issueQuantity'];
    $query = "Select Quantity FROM Stock WHERE StockID = ?";
    $param = array($id);
    $res = sqlsrv_query($conn, $query, $param);
    $row =  sqlsrv_fetch_array($res, SQLSRV_FETCH_ASSOC);
    $dbQuantity = $row['Quantity'];

    if ($dbQuantity < $quantity)
    {
        echo $false;
    }
    else if($dbQuantity >= $quantity)
    {
        echo $true;
    }

Answer 1

Do you realise that your function(result){ ... } will only be called when the server response for your POST request is received? You have to build the code to take that delay into account.