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Priority in JavaScript Kanban control

By default, the Kanban cards are initially placed and drop the card inside the columns based on JSON data orders.

Cards are placed in a particular position in the columns when you drop the cards by specifying the priority property, which is mapped from the datasource. This property allows the users to drop the cards in the Kanban board where exactly created on dropped clone. It is also helpful to render the cards based on the priority property value.

The following cases are dynamically changed their priority value when drop the cards.

  • If the cell has no cards, the dropped card priority value does not change.
  • If the cell has one card and dropped a card to last position or previous/next cards that do not have continuous order, then the dropped card priority value changed based on their previous card value.
  • If the cell has one card and dropped a card on previous position, then compare both values and the dropped card priority value is changed if the cards have continuous order otherwise not changed their value.
  • When the previous and next cards does not have continuous order, the dropped card priority value changed based on the previous card value.
  • When previous and next cards have continuous order or odd/even value, then the dropped card followed by next all cards up to continuous value are dynamically changed their priority value based on the previous card value.

For Example, Continuous Order - Column A having Card A with priority value 1, Card B with priority value 2 and Card C with priority value 3. Column B having Card D with priority value 5. Dropped Card D between Card A and Card B. Now, Card D, B and C dynamically changed their priority value to 2, 3, 4.

Odd/Even order - Column A having Card A with priority value 1, Card B with priority value 3 and Card C with priority value 5. Column B having Card D with priority value 5. Dropped Card D between Card A and Card B. Now, Card D, B and C dynamically changed their priority value to 2, 3, 5.

The priority property mapping key value must be number format.

Source
Preview
index.ts
index.html
datasource.ts
import { Kanban } from '@syncfusion/ej2-kanban';
import { kanbanData } from './datasource.ts';

let kanbanObj: Kanban = new Kanban({
    dataSource: kanbanData,
    keyField: 'Status',
    columns: [
        { headerText: 'Backlog', keyField: 'Open' },
        { headerText: 'In Progress', keyField: 'InProgress' },
        { headerText: 'Testing', keyField: 'Testing' },
        { headerText: 'Done', keyField: 'Close' }
    ],
    cardSettings: {
        contentField: 'Summary',
        headerField: 'Id',
        priority: 'RankId'
    }
});
kanbanObj.appendTo('#Kanban');
<!DOCTYPE html>
<html lang="en">

<head>
    <title>Kanban Priority</title>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta name="description" content="Kanban Priority" />
    <meta name="author" content="Syncfusion" />
    <link href="index.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-base/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-buttons/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-inputs/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-dropdowns/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-layouts/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-navigations/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-popups/styles/material.css" rel="stylesheet" />
    <link href="//cdn.syncfusion.com/ej2/ej2-kanban/styles/material.css" rel="stylesheet" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.38/system.js" type="text/javascript"></script>
    <script src="systemjs.config.js" type="text/javascript"></script>
</head>

<body>
    <div id='loader'>LOADING....</div>
    <div id='container'>
        <div class="content-wrapper">
            <div id="Kanban"></div>
        </div>
    </div>
</body>

</html>
export let kanbanData: Object[] = [
    {
        'Id': 1,
        'Status': 'Open',
        'Summary': 'Analyze the new requirements gathered from the customer.',
        'Type': 'Story',
        'Priority': 'Low',
        'Tags': 'Analyze,Customer',
        'Estimate': 3.5,
        'Assignee': 'Nancy Davloio',
        'RankId': 1
    },
    {
        'Id': 2,
        'Status': 'InProgress',
        'Summary': 'Improve application performance',
        'Type': 'Improvement',
        'Priority': 'Normal',
        'Tags': 'Improvement',
        'Estimate': 6,
        'Assignee': 'Andrew Fuller',
        'RankId': 1
    },
    {
        'Id': 3,
        'Status': 'Open',
        'Summary': 'Arrange a web meeting with the customer to get new requirements.',
        'Type': 'Others',
        'Priority': 'Critical',
        'Tags': 'Meeting',
        'Estimate': 5.5,
        'Assignee': 'Janet Leverling',
        'RankId': 2
    },
    {
        'Id': 4,
        'Status': 'InProgress',
        'Summary': 'Fix the issues reported in the IE browser.',
        'Type': 'Bug',
        'Priority': 'Release Breaker',
        'Tags': 'IE',
        'Estimate': 2.5,
        'Assignee': 'Janet Leverling',
        'RankId': 2
    },
    {
        'Id': 5,
        'Status': 'Testing',
        'Summary': 'Fix the issues reported by the customer.',
        'Type': 'Bug',
        'Priority': 'Low',
        'Tags': 'Customer',
        'Estimate': '3.5',
        'Assignee': 'Steven walker',
        'RankId': 1
    },
    {
        'Id': 6,
        'Status': 'Close',
        'Summary': 'Arrange a web meeting with the customer to get the login page requirements.',
        'Type': 'Others',
        'Priority': 'Low',
        'Tags': 'Meeting',
        'Estimate': 2,
        'Assignee': 'Michael Suyama',
        'RankId': 1
    },
    {
        'Id': 7,
        'Status': 'Validate',
        'Summary': 'Validate new requirements',
        'Type': 'Improvement',
        'Priority': 'Low',
        'Tags': 'Validation',
        'Estimate': 1.5,
        'Assignee': 'Robert King',
        'RankId': 1
    },
    {
        'Id': 8,
        'Status': 'Close',
        'Summary': 'Login page validation',
        'Type': 'Story',
        'Priority': 'Release Breaker',
        'Tags': 'Validation,Fix',
        'Estimate': 2.5,
        'Assignee': 'Laura Callahan',
        'RankId': 2
    },
    {
        'Id': 9,
        'Status': 'Testing',
        'Summary': 'Fix the issues reported in Safari browser.',
        'Type': 'Bug',
        'Priority': 'Release Breaker',
        'Tags': 'Fix,Safari',
        'Estimate': 1.5,
        'Assignee': 'Nancy Davloio',
        'RankId': 2
    },
    {
        'Id': 10,
        'Status': 'Close',
        'Summary': 'Test the application in the IE browser.',
        'Type': 'Story',
        'Priority': 'Low',
        'Tags': 'Testing,IE',
        'Estimate': 5.5,
        'Assignee': 'Margaret hamilt',
        'RankId': 3
    },
    {
        'Id': 11,
        'Status': 'Validate',
        'Summary': 'Validate the issues reported by the customer.',
        'Type': 'Story',
        'Priority': 'High',
        'Tags': 'Validation,Fix',
        'Estimate': 1,
        'Assignee': 'Steven walker',
        'RankId': 1
    },
    {
        'Id': 12,
        'Status': 'Testing',
        'Summary': 'Check Login page validation.',
        'Type': 'Story',
        'Priority': 'Release Breaker',
        'Tags': 'Testing',
        'Estimate': 0.5,
        'Assignee': 'Michael Suyama',
        'RankId': 3
    },
    {
        'Id': 13,
        'Status': 'Open',
        'Summary': 'API improvements.',
        'Type': 'Improvement',
        'Priority': 'High',
        'Tags': 'Grid,API',
        'Estimate': 3.5,
        'Assignee': 'Robert King',
        'RankId': 3
    },
    {
        'Id': 14,
        'Status': 'InProgress',
        'Summary': 'Add responsive support to application',
        'Type': 'Epic',
        'Priority': 'Critical',
        'Tags': 'Responsive',
        'Estimate': 6,
        'Assignee': 'Laura Callahan',
        'RankId': 3
    },
    {
        'Id': 15,
        'Status': 'Open',
        'Summary': 'Show the retrieved data from the server in grid control.',
        'Type': 'Story',
        'Priority': 'High',
        'Tags': 'Database,SQL',
        'Estimate': 5.5,
        'Assignee': 'Margaret hamilt',
        'RankId': 4
    },
    {
        'Id': 16,
        'Status': 'InProgress',
        'Summary': 'Fix cannot open user’s default database SQL error.',
        'Priority': 'Critical',
        'Type': 'Bug',
        'Tags': 'Database,Sql2008',
        'Estimate': 2.5,
        'Assignee': 'Janet Leverling',
        'RankId': 4
    },
    {
        'Id': 17,
        'Status': 'Testing',
        'Summary': 'Fix the issues reported in data binding.',
        'Type': 'Story',
        'Priority': 'Normal',
        'Tags': 'Databinding',
        'Estimate': '3.5',
        'Assignee': 'Janet Leverling',
        'RankId': 4
    },
    {
        'Id': 18,
        'Status': 'Close',
        'Summary': 'Analyze SQL server 2008 connection.',
        'Type': 'Story',
        'Priority': 'Release Breaker',
        'Tags': 'Grid,Sql',
        'Estimate': 2,
        'Assignee': 'Andrew Fuller',
        'RankId': 4
    },
    {
        'Id': 19,
        'Status': 'Validate',
        'Summary': 'Validate databinding issues.',
        'Type': 'Story',
        'Priority': 'Low',
        'Tags': 'Validation',
        'Estimate': 1.5,
        'Assignee': 'Margaret hamilt',
        'RankId': 1
    },
    {
        'Id': 20,
        'Status': 'Close',
        'Summary': 'Analyze grid control.',
        'Type': 'Story',
        'Priority': 'High',
        'Tags': 'Analyze',
        'Estimate': 2.5,
        'Assignee': 'Margaret hamilt',
        'RankId': 5
    },
    {
        'Id': 21,
        'Status': 'Close',
        'Summary': 'Stored procedure for initial data binding of the grid.',
        'Type': 'Others',
        'Priority': 'Release Breaker',
        'Tags': 'Databinding',
        'Estimate': 1.5,
        'Assignee': 'Steven walker',
        'RankId': 6
    },
    {
        'Id': 22,
        'Status': 'Close',
        'Summary': 'Analyze stored procedures.',
        'Type': 'Story',
        'Priority': 'Release Breaker',
        'Tags': 'Procedures',
        'Estimate': 5.5,
        'Assignee': 'Janet Leverling',
        'RankId': 7
    },
    {
        'Id': 23,
        'Status': 'Validate',
        'Summary': 'Validate editing issues.',
        'Type': 'Story',
        'Priority': 'Critical',
        'Tags': 'Editing',
        'Estimate': 1,
        'Assignee': 'Nancy Davloio',
        'RankId': 1
    },
    {
        'Id': 24,
        'Status': 'Testing',
        'Summary': 'Test editing functionality.',
        'Type': 'Story',
        'Priority': 'Normal',
        'Tags': 'Editing,Test',
        'Estimate': 0.5,
        'Assignee': 'Nancy Davloio',
        'RankId': 5
    },
    {
        'Id': 25,
        'Status': 'Open',
        'Summary': 'Enhance editing functionality.',
        'Type': 'Improvement',
        'Priority': 'Low',
        'Tags': 'Editing',
        'Estimate': 3.5,
        'Assignee': 'Andrew Fuller',
        'RankId': 5
    }
];