itflow/agent/modals/invoice/invoice_edit.php

<?php

require_once '../../../includes/modal_header.php';

$invoice_id = intval($_GET['id']);

$sql = mysqli_query($mysqli, "SELECT * FROM invoices LEFT JOIN clients ON invoice_client_id = client_id WHERE invoice_id = $invoice_id LIMIT 1");

$row = mysqli_fetch_array($sql);
$invoice_prefix = nullable_htmlentities($row['invoice_prefix']);
$invoice_number = intval($row['invoice_number']);
$invoice_scope = nullable_htmlentities($row['invoice_scope']);
$invoice_date = nullable_htmlentities($row['invoice_date']);
$invoice_due = nullable_htmlentities($row['invoice_due']);
$invoice_discount = floatval($row['invoice_discount_amount']);
$invoice_created_at = nullable_htmlentities($row['invoice_created_at']);
$category_id = intval($row['invoice_category_id']);
$client_id = intval($row['client_id']);
$client_name = nullable_htmlentities($row['client_name']);

// Generate the HTML form content using output buffering.
ob_start();
?>

<div class="modal-header bg-dark">
    <h5 class="modal-title"><i class="fas fa-fw fa-file-invoice mr-2"></i>Editing invoice: <strong><?php echo "$invoice_prefix$invoice_number"; ?></strong> - <?php echo $client_name; ?></h5>
    <button type="button" class="close text-white" data-dismiss="modal">
        <span>&times;</span>
    </button>
</div>
<form action="post.php" method="post" autocomplete="off">
    <input type="hidden" name="invoice_id" value="<?php echo $invoice_id; ?>">

    <div class="modal-body" <?php if (lookupUserPermission('module_sales') <= 1) { echo 'inert'; } ?>>

        <div class="form-group">
            <label>Invoice Date <strong class="text-danger">*</strong></label>
            <div class="input-group">
                <div class="input-group-prepend">
                    <span class="input-group-text"><i class="fa fa-fw fa-calendar"></i></span>
                </div>
                <input type="date" class="form-control" name="date" max="2999-12-31" value="<?php echo $invoice_date; ?>" required>
            </div>
        </div>

        <div class="form-group">
            <label>Invoice Due <strong class="text-danger">*</strong></label>
            <div class="input-group">
                <div class="input-group-prepend">
                    <span class="input-group-text"><i class="fa fa-fw fa-calendar-alt"></i></span>
                </div>
                <input type="date" class="form-control" name="due" max="2999-12-31" value="<?php echo $invoice_due; ?>" required>
            </div>
        </div>

        <div class="form-group">
            <label>Income Category <strong class="text-danger">*</strong></label>
            <div class="input-group">
                <div class="input-group-prepend">
                    <span class="input-group-text"><i class="fa fa-fw fa-tag"></i></span>
                </div>
                <select class="form-control select2" name="category" required>
                    <option value="">- Category -</option>
                    <?php

                    $sql_income_category = mysqli_query($mysqli, "SELECT * FROM categories WHERE category_type = 'Income' AND (category_archived_at > '$invoice_created_at' OR category_archived_at IS NULL) ORDER BY category_name ASC");
                    while ($row = mysqli_fetch_array($sql_income_category)) {
                        $category_id_select = intval($row['category_id']);
                        $category_name_select = nullable_htmlentities($row['category_name']);
                    ?>
                        <option <?php if ($category_id == $category_id_select) {
                                    echo "selected";
                                } ?> value="<?php echo $category_id_select; ?>"><?php echo $category_name_select; ?></option>

                    <?php
                    }
                    ?>
                </select>
                <div class="input-group-append">
                    <button class="btn btn-secondary ajax-modal" type="button"
                        data-modal-url="../admin/modals/category/category_add.php?category=Income">
                        <i class="fas fa-fw fa-plus"></i>
                    </button>
                </div>
            </div>
        </div>

        <div class='form-group'>
            <label>Discount Amount</label>
            <div class='input-group'>
                <div class='input-group-prepend'>
                    <span class='input-group-text'><i class='fa fa-fw fa-dollar-sign'></i></span>
                </div>
                <input type='text' class='form-control' inputmode="decimal" pattern="-?[0-9]*\.?[0-9]{0,2}" name='invoice_discount' placeholder='0.00' value="<?php echo number_format($invoice_discount, 2, '.', ''); ?>">
            </div>
        </div>

        <div class="form-group">
            <label>Scope</label>
            <div class="input-group">
                <div class="input-group-prepend">
                    <span class="input-group-text"><i class="fa fa-fw fa-comment"></i></span>
                </div>
                <input type="text" class="form-control" name="scope" placeholder="Quick description" maxlength="255" value="<?php echo $invoice_scope; ?>">
            </div>
        </div>

    </div>
    <div class="modal-footer">
        <button type="submit" name="edit_invoice" class="btn btn-primary text-bold"><i class="fas fa-check mr-2"></i>Save</button>
        <button type="button" class="btn btn-light" data-dismiss="modal"><i class="fa fa-times mr-2"></i>Cancel</button>
    </div>
</form>

<?php

require_once '../../../includes/modal_footer.php';