如何在拖放项目和更新数据库后获取jQuery Nestable插件中的children和id？

Question

I'm using jQuery Nestable plugin to create a menu editor for a website. I've tried to get item ID and Children after user clicks on menu items and change their position.

Issue : I don't know how to get ID and Children and update into database.

Here is jQuery Nestable plugin

<script>
    $(document).ready(function () {
        var updateOutput = function (e) {
            var list = e.length ? e : $(e.target), output = list.data('output');
            if (window.JSON) {output.val(window.JSON.stringify(list.nestable('serialize')));//, null, 2));
            } else {
                output.val('JSON browser support required for this demo.');
            }
        console.log(list.nestable('serialize'));
        console.log(window.JSON.stringify(list.nestable('serialize')));
        };
        $('#nestable').nestable({
            group: 1,
            maxDepth: 7,
        }).on('change', updateOutput);
        updateOutput($('#nestable').data('output', $('#nestable-output')));
    });
</script>

Here is HTML for menus

<div class="cf nestable-lists">
    <div class="dd" id="nestable">
        <ol class="dd-list">
            <li class="dd-item" data-id="1"> <div class="dd-handle">Item 1 when parent == 0</div> </li>
            <li class="dd-item" data-id="44"> <div class="dd-handle"> Item 2 when this parent_id == its id </div>
                <ol class="dd-list">
                    <li class="dd-item" data-id="3"><div class="dd-handle">Item 3</div></li>
                    <li class="dd-item" data-id="4"><div class="dd-handle">Item 3</div></li>
                    <li class="dd-item" data-id="5"><div class="dd-handle">Item 3</div></li>
                    <li class="dd-item" data-id="6"><div class="dd-handle">Item 3</div></li>
                </ol>
            </li>
        </ol>
    </div>
</div>

The result on Console

[{"id":1},{"id":44,"children":[{"id":3},{"id":4},{"id":5},{"id":6}]}]

Edition

In my structure I want to update menus when Parent_id == id where menus id and create level of menus item bu number of M_order . But I don't know to create this structure.

And here is var_dump($this->input->post('list'));

 1 => 
    array (size=1)
      'id' => string '2' (length=1)
  2 => 
    array (size=1)
      'id' => string '3' (length=1)
  3 => 
    array (size=1)
      'id' => string '4' (length=1)
  4 => 
    array (size=1)
      'id' => string '5' (length=1)
  5 => 
    array (size=2)
      'id' => string '6' (length=1)
      'children' => 
        array (size=1)
          0 => 
            array (size=2)
              ...

Here is images of my Table structure and menus

Answer 1

To send the list to PHP, you have to change your updateOutput function to post the list via AJAX:

<script>
$(document).ready(function () {
    var updateOutput = function (e) {
        var list = e.length ? e : $(e.target), output = list.data('output');

        $.ajax({
            method: "POST",
            url: "saveList.php",
            data: {
                list: list.nestable('serialize')
            }
        }).fail(function(jqXHR, textStatus, errorThrown){
            alert("Unable to save new list order: " + errorThrown);
        });
    };

    $('#nestable').nestable({
        group: 1,
        maxDepth: 7,
    }).on('change', updateOutput);
});
</script>

In PHP, you will receive $_POST['list'] , which will look as shown below. In this case, I dragged the 4th item (id 6) to the 2nd place (after id 3) on the list, so the expected order is 3, 6, 4, 5 :

Array (
    [0] => Array (
        [id] => 1
    )
    [1] => Array (
        [id] => 44
        [children] => Array (
            [0] => Array (
                [id] => 3
            )
            [1] => Array (
                [id] => 6
            )
            [2] => Array (
                [id] => 4
            )
            [3] => Array (
                [id] => 5
            )
        )
    )
)

Then you can just iterate over this array and update your database accordingly.

---

Edit : In order to save the data in PHP, you'll have to use recursion to navigate all the children arrays that might exist. I wrote a simple script that will save on every ordering change:

index.php

<?php
require "pdoConnection.php";
$list = getFullListFromDB($conn);
?>

<html>
<head>
<script src="https://code.jquery.com/jquery-1.11.3.min.js"></script>
<script src="https://cdn.rawgit.com/dbushell/Nestable/master/jquery.nestable.js"></script>
<script>
$(document).ready(function () {
    var updateOutput = function (e) {
        var list = e.length ? e : $(e.target), output = list.data('output');

        $.ajax({
            method: "POST",
            url: "saveList.php",
            data: {
                list: list.nestable('serialize')
            }
        }).fail(function(jqXHR, textStatus, errorThrown){
            alert("Unable to save new list order: " + errorThrown);
        });
    };

    $('#nestable').nestable({
        group: 1,
        maxDepth: 7,
    }).on('change', updateOutput);
});
</script>
</head>

<body>
<div class="cf nestable-lists">
    <div class="dd" id="nestable">
<?php displayList($list); ?>
    </div>
</div>
</body>
</html>

<?php
function getFullListFromDB($conn, $parent_id = 0) {
    $sql = "
        SELECT id, parent_id, description
        FROM items 
        WHERE parent_id = :parent_id
        ORDER BY m_order
    ";

    $statement = $conn->prepare($sql);
    $statement->bindValue(':parent_id', $parent_id, PDO::PARAM_INT);
    $statement->execute();

    $result = $statement->fetchAll(PDO::FETCH_ASSOC);

    foreach($result as &$value) {
        $subresult = getFullListFromDB($conn, $value["id"]);

        if (count($subresult) > 0) {
            $value['children'] = $subresult;
        }
    }
    unset($value);

    return $result;
}

function displayList($list) {
?>
    <ol class="dd-list">
    <?php foreach($list as $item): ?>
    <li class="dd-item" data-id="<?php echo $item["id"]; ?>"><div class="dd-handle"><?php echo $item["description"]; ?></div>
    <?php if (array_key_exists("children", $item)): ?>
    <?php displayList($item["children"]); ?>
    <?php endif; ?>
    </li>
    <?php endforeach; ?>
    </ol>
<?php
}
?>

saveList.php

<?php

require "pdoConnection.php";

if ($_POST) {
    saveList($conn, $_POST['list']);
    exit;
}

function saveList($conn, $list, $parent_id = 0, &$m_order = 0) {
    foreach($list as $item) {
        $m_order++;

        $sql = "
            UPDATE items
            SET 
                parent_id = :parent_id,
                m_order = :m_order
            WHERE id = :id
        ";
        $statement = $conn->prepare($sql);
        $statement->bindValue(":parent_id", $parent_id, PDO::PARAM_INT);
        $statement->bindValue(":id", $item["id"], PDO::PARAM_INT);
        $statement->bindValue(":m_order", $m_order, PDO::PARAM_INT);
        $statement->execute();

        if (array_key_exists("children", $item)) {
            saveList($conn, $item["children"], $item["id"], $m_order);
        }
    }
}

?>

pdoConnection.php

<?php
$server = "myServer"; $database = "DbName"; $username = "myself"; $password = "secret";
$conn = new PDO("sqlsrv:Server=$server;Database=$database", $username, $password);
?>

Table definition (MSSQL)

CREATE TABLE [items](
    [id] [int] NOT NULL,
    [parent_id] [int] NOT NULL,
    [description] [nvarchar](100) NOT NULL,
    [m_order] [int] NOT NULL,
    CONSTRAINT [PK_items] PRIMARY KEY CLUSTERED ([id] ASC)
) ON [PRIMARY]

INSERT [items] ([id], [parent_id], [description], [m_order]) VALUES (1, 0, N'Item 1', 1)
INSERT [items] ([id], [parent_id], [description], [m_order]) VALUES (2, 0, N'Item 2', 2)
INSERT [items] ([id], [parent_id], [description], [m_order]) VALUES (3, 2, N'Item 3.1', 3)
INSERT [items] ([id], [parent_id], [description], [m_order]) VALUES (4, 2, N'Item 3.2', 4)
INSERT [items] ([id], [parent_id], [description], [m_order]) VALUES (5, 2, N'Item 3.3', 5)
INSERT [items] ([id], [parent_id], [description], [m_order]) VALUES (6, 2, N'Item 3.4', 6)