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JavaScript/jQuery Gantt - Task Template

The DevExtreme JavaScript JavaScript Gantt templates help customize the layout and appearance of individual task elements. Templates allow you to mix HTML code with any DevExtreme JavaScript component - and position desired elements within the container. In this demo, a template is used to display images within tasks and change their background color.

Backend API
$(() => { $('#gantt').dxGantt({ taskTitlePosition: 'outside', scaleType: 'days', tasks: { dataSource: tasks, }, dependencies: { dataSource: dependencies, }, resources: { dataSource: resources, }, resourceAssignments: { dataSource: resourceAssignments, }, editing: { enabled: true, }, columns: [{ dataField: 'title', caption: 'Subject', width: 300, }, { dataField: 'start', caption: 'Start Date', }, { dataField: 'end', caption: 'End Date', }], taskListWidth: 500, taskContentTemplate: getTaskContentTemplate, }).dxGantt('instance'); function getImagePath(taskId) { const imgPath = '../../../../images/employees/'; let img = taskId < 10 ? `0${taskId}` : taskId; img = `${imgPath + img}.png`; return img; } function getTaskContentTemplate(item) { const resource = item.taskResources[0]; const img = getImagePath(item.taskData.id); const color = item.taskData.id % 6; const taskWidth = `${item.taskSize.width}px;`; const $customContainer = $(document.createElement('div')) .addClass('custom-task') .attr('style', `width:${taskWidth}`) .addClass(`custom-task-color-${color}`); const $imgWrapper = $(document.createElement('div')) .addClass('custom-task-img-wrapper') .appendTo($customContainer); $(document.createElement('img')) .addClass('custom-task-img') .attr({ src: resource ? img : 'unknown.png', alt: 'imageAlt', }) .appendTo($imgWrapper); const $wrapper = $(document.createElement('div')) .addClass('custom-task-wrapper') .appendTo($customContainer); $(document.createElement('div')) .addClass('custom-task-title') .text(item.taskData.title) .appendTo($wrapper); $(document.createElement('div')) .addClass('custom-task-row') .text(resource ? resource.text : '') .appendTo($wrapper); $(document.createElement('div')) .addClass('custom-task-progress') .attr('style', `width:${parseFloat(item.taskData.progress)}%;`) .appendTo($customContainer); return $customContainer; } });
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" lang="en"> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" /> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script> <script src="https://cdn3.devexpress.com/jslib/25.1.6/js/dx-gantt.min.js"></script> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/25.1.6/css/dx.light.css" /> <link rel="stylesheet" href="https://cdn3.devexpress.com/jslib/25.1.6/css/dx-gantt.min.css" /> <script src="js/dx.all.js?v=25.1.6"></script> <script src="data.js"></script> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="index.js"></script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="gantt"> </div> </div> </body> </html>
#gantt { height: 700px; } .custom-task-color-0 { background-color: #5c57c9; } .custom-task-color-1 { background-color: #35b86b; } .custom-task-color-2 { background-color: #4796ce; } .custom-task-color-3 { background-color: #ce4776; } .custom-task-color-4 { background-color: #ce5b47; } .custom-task-color-5 { background-color: #f78119; } .custom-task-color-6 { background-color: #9f47ce; } .custom-task { max-height: 48px; height: 100%; display: block; overflow: hidden; } .custom-task-wrapper { padding: 8px; color: #fff; } .custom-task-wrapper > * { display: block; overflow: hidden; text-overflow: ellipsis; } .custom-task-img-wrapper { float: left; width: 32px; height: 32px; border-radius: 50%; margin: 8px; background-color: #fff; overflow: hidden; } .custom-task-img { width: 32px; } .custom-task-title { font-weight: 600; font-size: 13px; } .custom-task-row { font-size: 11px; } .custom-task-progress { position: absolute; left: 0; bottom: 0; width: 0%; height: 4px; background: rgba(0, 0, 0, 0.3); } .dx-gantt .dx-row { height: 63px; }
const currentDate = new Date(Date.now()); const month = currentDate.getMonth(); const year = currentDate.getFullYear(); const tasks = [{ id: 1, parentId: 0, title: 'Analysis/Software Requirements', start: new Date(year, month, 1), end: new Date(year, month, 28), progress: 31, }, { id: 2, parentId: 1, title: 'Conduct needs analysis', start: new Date(year, month, 1), end: new Date(year, month, 3), progress: 15, }, { id: 3, parentId: 1, title: 'Draft preliminary software specifications', start: new Date(year, month, 3), end: new Date(year, month, 5), progress: 30, }, { id: 4, parentId: 1, title: 'Review software specifications/budget with team', start: new Date(year, month, 4), end: new Date(year, month, 6), progress: 60, }, { id: 5, parentId: 1, title: 'Incorporate feedback on software specifications', start: new Date(year, month, 6), end: new Date(year, month, 8), progress: 45, }, { id: 6, parentId: 1, title: 'Develop delivery timeline', start: new Date(year, month, 8), end: new Date(year, month, 14), progress: 15, }, { id: 7, parentId: 1, title: 'Obtain approvals to proceed (concept, timeline, budget)', start: new Date(year, month, 14), end: new Date(year, month, 20), progress: 15, }, { id: 8, parentId: 1, title: 'Draft preliminary software specifications', start: new Date(year, month, 20), end: new Date(year, month, 25), progress: 0, }, { id: 9, parentId: 1, title: 'Secure required resources', start: new Date(year, month, 25), end: new Date(year, month, 28), progress: 0, }, ]; const dependencies = [{ id: 1, predecessorId: 2, successorId: 3, type: 0, }, { id: 2, predecessorId: 3, successorId: 4, type: 0, }, { id: 3, predecessorId: 4, successorId: 5, type: 0, }, { id: 4, predecessorId: 5, successorId: 6, type: 0, }, { id: 5, predecessorId: 6, successorId: 7, type: 0, }, { id: 6, predecessorId: 7, successorId: 8, type: 0, }, { id: 7, predecessorId: 8, successorId: 9, type: 0, }]; const resources = [{ id: 1, text: 'John Heart', }, { id: 2, text: 'Paul Peyton', }, { id: 3, text: 'Robert Reagan', }, { id: 4, text: 'Greta Sims', }, { id: 5, text: 'Brett Wade', }, { id: 6, text: 'Sandra Johnson', }, { id: 7, text: 'Kevin Carter', }, { id: 8, text: 'Cynthia Stanwick', }, { id: 9, text: 'Olivia Samuelson', }]; const resourceAssignments = [{ id: 0, taskId: 1, resourceId: 1, }, { id: 1, taskId: 2, resourceId: 2, }, { id: 2, taskId: 3, resourceId: 3, }, { id: 3, taskId: 4, resourceId: 4, }, { id: 4, taskId: 5, resourceId: 5, }, { id: 5, taskId: 6, resourceId: 6, }, { id: 6, taskId: 7, resourceId: 7, }, { id: 7, taskId: 8, resourceId: 8, }, { id: 8, taskId: 9, resourceId: 9, }];

Implementation: Use the taskContentTemplate template to customize and align task information within the template container. For each task, use the item property to obtain task information (title, resource, progress) and wrap it into div elements. Then, apply CSS styles to these div elements and place them into the container.