Develop Interactive Gantt Chart Interfaces for JavaScript Enterprise Applications

Gantt Chart Visualization

This JS GanttSheet add-on provides a flexible Gantt chart visualization engine that helps developers create interactive project scheduling experiences with customizable timelines, chart layouts, and task displays. Developers can configure timescale tiers, timeline intervals, taskbars, dependencies, gridlines, non-working time, zooming, scrolling, and split-view layouts to support detailed project planning and schedule management. The SpreadJS Designer also includes a dedicated GANTT CHART FORMAT tab that allows users to visually customize taskbar appearance, dependency link styles, gridlines, task layouts, and bar formatting rules without extensive coding. With support for predefined taskbar styles, configurable timeline views, and interactive chart formatting controls, GanttSheet makes it easier to build highly visual scheduling applications for construction, logistics, engineering, media production, and other project-driven industries.

• View Demo and Code
• Gantt Chart Components Documentation
• Designer Documentation

Task Management

GanttSheet provides comprehensive task management capabilities that help enterprise web developers build advanced project planning and scheduling applications. Applications can support normal tasks, summary tasks, milestones, predecessors, successors, task hierarchies, and both automatic and manual scheduling modes for managing complex project workflows. The SpreadJS GanttSheet add-on automatically recalculates schedules based on dependencies, calendars, hierarchy changes, and task operations such as add, delete, indent/outdent, and sorting. The SpreadJS Designer also includes a dedicated TASK tab that allows users to visually manage task completion, task linking, hierarchy levels, scheduling modes, milestone creation, task insertion, and project search operations directly within the Gantt interface. Together, these features help users organize schedules, track dependencies, and manage large-scale project timelines more efficiently across construction, engineering, logistics, manufacturing, and other project-driven industries.

• View Demo and Code
• GanttSheet Task Documentation
• Designer Documentation

Project Timeline Management

This JavaScript GanttSheet add-on gives developers the tools to create timeline-driven project management applications with task planning, scheduling, progress tracking, and dependency visualization built into a spreadsheet-style interface. Users can manage project start and finish dates, task durations, milestones, summary tasks, predecessors, successors, and schedule modes while viewing changes directly in the Gantt chart timeline. Developers can support high-level project overviews and detailed task-level planning with configurable timescales, zooming, scrolling, taskbar layouts, gridlines, and calendar settings. This makes it easier to deliver scheduling solutions for construction, engineering, logistics, media production, and other project-based industries where timeline accuracy and visibility are essential.

• View Demo and Code
• Designer Documentation

Bind & Initialize Data

GanttSheet uses the DataManager view as its data source, allowing developers to bind server-backed table data into an interactive Gantt scheduling experience. When a table is selected, GanttSheet initializes its internal project model and maps required fields such as task number and task name, with support for common task fields like start, finish, duration, predecessors, mode, completion percentage, and milestone status. Using the SpreadJS Designer, users can bind existing DataSource tables or create new ones, configure schema types, relationships, external CRUD URLs, calculated columns, and drag-and-drop field mappings. GanttSheet can also infer mappings automatically from exact field-name matches, naming conventions, and compatible data types, helping developers accelerate setup while still supporting manual configuration for complex project data models.

• View Demo and Code
• Data Manager Documentation
• Designer Documentation

Milestone Tracking

Our JavaScript GanttSheet add-on supports milestone tracking by allowing enterprise developers to add zero-duration milestone tasks directly into the project schedule. Milestones appear in the Gantt chart UI area with a dedicated milestone icon and date text, helping users quickly identify important project events such as phase completions, delivery dates, approvals, and launch targets. Developers can insert milestone tasks programmatically using methods like insertTasksByRow(), defining task data with a milestone name and duration. This gives scheduling applications a clear way to highlight critical checkpoints across construction, engineering, logistics, media production, and other timeline-driven workflows.

• View Demo and Code
• Add Milestone Tasks Documentation

Progress Tracking

GanttSheet provides built-in progress tracking tools that help developers create more transparent and measurable project scheduling applications. By including the complete field in the data source, applications can display interactive progress bars directly inside Gantt taskbars, allowing users to visually monitor and update task completion percentages from 0 to 100. Developers can access and modify task progress programmatically using the complete and completeThrough properties of the Task class, while the SpreadJS Designer also supports rapid completion updates with preset progress controls. Summary task progress is automatically recalculated based on the completion and duration of subtasks, helping users maintain accurate project status visibility across large scheduling environments.

• View Demo and Code
• Change Task Progress Status Documentation

Resource Assignment

GanttSheet’s resource assignment features enable web developers to build project scheduling applications that connect tasks, assignments, and resource data into a unified planning experience. By linking Task, Assignment, and Resource tables through DataManager relationships, applications can assign resources to tasks, display resource names directly within the GanttSheet, and change resource assignments through interactive dropdown controls. 

GanttSheet automatically manages assignment updates, synchronizes changes with the Assignment table, and supports work time calculations based on task duration and assigned resources. Developers can also configure resource management workflows visually in the SpreadJS Designer, making it easier to build workforce planning, project staffing, and operational scheduling solutions for construction, logistics, engineering, manufacturing, and other resource-driven industries.

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• Resources Documentation
• Designer Documentation

Task Dependencies

This JavaScript Gantt chart UI add-on supports advanced task dependency management that helps developers build scheduling applications with connected project workflows and automated timeline coordination. Applications can create and remove dependencies between tasks using the addDependency() and removeDependency() methods, with support for all major dependency types including Finish-to-Start (FS), Start-to-Start (SS), Finish-to-Finish (FF), and Start-to-Finish (SF). Linked tasks automatically influence scheduling calculations, helping users manage predecessor and successor relationships across complex project structures. Combined with visual dependency lines, automatic schedule recalculation, and Designer-based link/unlink controls, the SpreadJS' GanttSheet add-on makes it easier to build interactive project planning experiences for construction, engineering, logistics, manufacturing, and other dependency-driven workflows.

• Unlink Task Documentation

Data Manager Integration

The SpreadJS GanttSheet add-on integrates directly with the SpreadJS DataManager, a structured runtime data engine that manages tables, schemas, relationships, validation, calculated fields, and component-ready views. Developers can use DataManager to organize project data, define task hierarchies, establish relationships between tasks and resources, and prepare structured views for binding to GanttSheet. Since DataManager acts as the shared data layer for components like TableSheet, GanttSheet, ReportSheet, and Data Charts, developers can reuse the same relational data model across multiple application experiences. Both runtime APIs and the SpreadJS Designer support configuring tables, schemas, CRUD operations, calculated columns, and relationships, making it easier to build scalable, data-driven project management applications with synchronized scheduling and structured data workflows.

• View Demo and Code
• GanttSheet DataManager Documentation
• DataManager Documentation

Data-Bound GanttSheet

GanttSheet, our JavaScript Gantt chart component, is built to work with structured data, allowing developers to bind project schedules to tables defined in the SpreadJS DataSource. Once a table is selected, GanttSheet initializes its internal data model and automatically attempts to resolve field mappings for task data, scheduling fields, relationships, and calculated columns. In the SpreadJS Designer, users can choose an existing table or create a new one from the Gantt Sheet panel, then manage schema types, relationships, external CRUD URLs, and calculated fields through the Data Binding tools. This data-bound architecture makes it easier to build project management applications that stay connected to enterprise data sources while delivering an interactive Gantt chart experience.

• View Demo and Code
• Bind and Initialize Data Documentation

Data Field Mapping

GanttSheet field mapping features help developers connect structured data sources to interactive project scheduling views with minimal configuration. Required fields such as Task Number and Task Name can be mapped to physical table columns, while additional fields including duration, start date, finish date, predecessors, completion percentage, milestones, and scheduling modes extend the project data model. GanttSheet automatically attempts to infer mappings based on exact field-name matches, naming conventions, and compatible data types, helping accelerate setup for common project schemas. In the SpreadJS Designer, JS developers and or select end-users can visually configure mappings through drag-and-drop field assignment tools, supporting both automatic inference and manual remapping for more complex enterprise data structures.

• Data and Fields Documentation
• Designer Documentation

Batch Data Updates

This JavaScript Gantt chart component supports batch mode synchronization to help developers manage large sets of project updates more efficiently. Instead of processing every task edit individually, applications can group schedule changes, dependency updates, resource assignments, and task modifications into a single batch submission using the ganttSheet.submitChanges() method. This approach improves performance and simplifies synchronization between the client application and server-side data services. GanttSheet is designed to work with server environments that support batch operations, while also allowing developers to implement custom client-side batch handling logic when server-side support is unavailable.

• View Demo and Code
• Batch Mode Synchronization Documentation

Hierarchical Data Binding

Our JavaScript GanttSheet supports hierarchical data binding to help developers build structured project schedules with parent-child task relationships and expandable task trees. Applications can configure hierarchy models using Parent, Level, or Children hierarchy types through the DataManager schema, allowing tasks to be organized into nested project structures that reflect real-world planning workflows. In the SpreadJS Designer, developers and power users can visually configure hierarchy relationships directly from the Task Name mapping settings, automatically rendering tasks in a tree-based Gantt layout. GanttSheet can also infer predecessor relationships when hierarchy or predecessor fields are configured, helping simplify dependency management while keeping the underlying data source synchronized with the generated task structure.

• Add Hierarchy Types Documentation
• Designer Documentation

Parent-Child Task Structures

GanttSheet supports parent-child task structures that help developers build organized project schedules with expandable task hierarchies and grouped workflows. Using configurable hierarchy schemas, applications can structure tasks through Parent, Level, or Children hierarchy models to represent phases, subtasks, workstreams, and nested project relationships. In the SpreadJS Designer, users can visually configure parent-child relationships through hierarchy settings, automatically rendering task names as expandable tree structures within the JavaScript Gantt chart UI. GanttSheet also supports automatic predecessor inference when hierarchy is configured, helping simplify dependency management and maintain synchronized scheduling logic across complex multi-level project plans.

• Outdent Task Documentation
• Designer Documentation

Column Cell Types

This JavaScript Gantt chart control includes built-in column cell types designed specifically for managing project scheduling data within spreadsheet-style interfaces. Developers can configure task-focused editors such as TaskSchedulingMode for Auto and Manual scheduling, TaskDuration for duration editing with unit controls, TaskDate for start and finish date selection, TaskPredecessor for dependency management, and TaskSubject for hierarchical task display. These schema-driven cell types improve usability by matching editing behavior to the underlying project data model while helping users manage schedules, dependencies, and task structures more efficiently. By aligning column behavior directly with GanttSheet task fields, developers can deliver more intuitive and data-aware project management experiences.

• Column Cell Types Documentation

Task Progress Status

The SpreadJS GanttSheet add-on provides built-in task progress status tracking that helps developers create more transparent and measurable project scheduling applications. By adding the complete field to the data source, applications can display percentage-based progress indicators directly inside Gantt taskbars, allowing users to visually monitor and update completion status from 0 to 100. Users can adjust progress interactively by dragging the taskbar progress indicator, while the SpreadJS Designer also includes quick completion controls for common progress values such as 25%, 50%, 75%, and 100%. Developers can additionally manage progress programmatically through the complete and completeThrough properties of the Task class, while summary task progress is automatically recalculated based on the duration and completion of subtasks during schedule updates and project recalculations.

• View Demo and Code
• Change Task Progress Status Documentation

Task Properties

The GanttSheet task properties give web developers the flexibility to build advanced project scheduling applications with rich task configuration and automated scheduling behavior. Tasks can include built-in properties such as task name, duration, start and finish dates, predecessors, successors, completion status, and scheduling mode, while also supporting Normal, Summary, and Milestone task types. Developers can configure both Auto and Manual scheduling modes, allowing schedules to either recalculate dynamically based on dependencies and calendars or follow manually defined task timelines. GanttSheet also automatically recalculates schedules during task operations such as adding, deleting, indenting, outdenting, sorting, and dependency creation, helping users maintain accurate project structures and synchronized task relationships across complex project plans.

• GanttSheet Task Documentation

Normal Tasks

The GanttSheet add-on allows web developers to create and insert normal tasks directly into project schedules programmatically using APIs such as addTasks() and insertTasks(). Newly inserted tasks automatically inherit hierarchy behavior based on surrounding task structures, helping maintain organized parent-child scheduling relationships within the Gantt chart. Developers can define task details such as task name, duration, scheduling mode, and dependencies while allowing users to interact with tasks in a spreadsheet-style interface. Combined with automatic hierarchy handling, outline support, and schedule recalculation, normal task management helps applications support scalable project planning workflows across construction, engineering, logistics, and other task-driven industries.

• View Demo and Code
• Add Normal Task Documentation

Summary Tasks

GanttSheet supports summary tasks that allow developers to organize related tasks into structured parent-child project groups within the Gantt chart. Summary tasks act as parent containers for subtasks, helping users manage large schedules through collapsible task hierarchies and grouped workflow organization. Developers can create summary tasks programmatically using methods such as insertTasks() and indentTasks(), while GanttSheet automatically maintains hierarchy relationships and task structure within the project timeline. This makes it easier to build project management applications that support phased planning, grouped workstreams, milestone organization, and multi-level scheduling across complex enterprise projects.

• View Demo and Code
• Add Summary Task Documentation

Milestone Tasks

The GanttSheet add-on supports milestone tasks that represent zero-duration events within a project schedule. When a milestone is added, GanttSheet displays the date text with a milestone icon in the chart area, making important checkpoints easy to identify in the timeline. Developers can insert milestone tasks programmatically using insertTasksByRow() and define milestone data with a task name and duration: 0. This helps users track major project phases, delivery dates, approvals, launches, and other critical schedule events across complex project plans.

• View Demo and Code
• Add Milestone Task Documentation

Link/Unlink Tasks

GanttSheet provides built-in link and unlink functionality that helps developers create project scheduling applications with dynamic task dependency management. Using the addDependency() and removeDependency() methods, applications can establish or remove predecessor relationships between tasks while supporting all major dependency types including Finish-to-Start (FS), Start-to-Start (SS), Finish-to-Finish (FF), and Start-to-Finish (SF). Linked tasks automatically participate in scheduling recalculations, helping users coordinate timelines, sequence project phases, and manage dependent workflows more efficiently. GanttSheet also includes built-in dependency validation rules to prevent invalid task relationships, duplicate links, and unsupported hierarchy connections within complex project structures.

• View Demo and Code
• Unlink Task Documentation

Resize Tasks

GanttSheet allows users to resize scheduled tasks visually within the Gantt chart interface using intuitive drag-and-drop interactions in the SpreadJS Designer. When users hover over the edge of a taskbar, they can drag the task boundary to extend or shorten the task duration directly on the timeline. This interactive resizing experience helps users make fast scheduling adjustments without manually editing duration fields or dates in the data grid. By supporting direct timeline manipulation, GanttSheet makes project planning workflows more efficient and easier to manage across dynamic scheduling environments.

• View Demo and Code
• Resize Task Documentation

Move Tasks

This JavaScript GanttSheet add-on allows users to move manually scheduled tasks directly within the project timeline using built-in task movement APIs. When a task is configured in Manual scheduling mode, developers can reposition tasks programmatically using methods such as moveInWeeks and moveInWorkingDays to shift schedules across the timeline while preserving task duration. This helps users quickly reorganize project plans, adjust timelines, and accommodate scheduling changes without rebuilding task structures manually. Combined with interactive timeline controls and manual scheduling support, task movement features make it easier to manage evolving project schedules in dynamic planning environments.

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• Move Task Documentation

Remove Tasks

GanttSheet supports task removal operations that allow developers to delete individual tasks, task ranges, or grouped task structures from a project schedule. Applications can use methods such as removeTasks(), removeTasksByRange(), clearTasks(), and clearTasksByRange() to manage task deletion programmatically. When a summary task is removed, GanttSheet also removes its child tasks, helping preserve the integrity of the project hierarchy. The root task remains protected and cannot be deleted, ensuring the project structure stays valid.

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• Remove Task Documentation

Timeline Scaling

GanttSheet provides flexible timeline scaling features that help developers create more navigable and responsive project scheduling experiences. Using the Timescale APIs, applications can zoom in for detailed task management or zoom out for high-level project overviews with methods such as zoomIn(), zoomOut(), zoomAuto(), zoomTo(), and zoomToRange(). Developers can also configure automatic timeline fitting, custom date ranges, and margin spacing using autoFitMode, minDate, maxDate, and margin settings to control how schedules are displayed and scrolled. Combined with customizable timeline tiers and Designer support, this JavaScript GanttSheet makes it easier for users to manage large, long-running, and highly detailed project schedules.

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• Zoom Documentation

TimeScale

This Gantt chart spreadsheet add-on provides flexible timescale configuration options that help developers control how project timelines are displayed and navigated within the Gantt chart. Using properties such as minDate, maxDate, autoFitMode, and margin, applications can define fixed timeline ranges or automatically fit the timescale to active project schedules. Developers can also configure timeline tiers, scrolling behavior, zoom levels, non-working time visibility, and boundary spacing to improve readability and reduce visual clipping around task labels. Combined with Designer support for configuring timescale intervals and display settings, GanttSheet makes it easier to create scalable scheduling interfaces for long-term project planning and complex timeline management.

• View Demo and Code
• Timescale Range and Autofit Documentation
• Designer Documentation

Non-Working Time Display

The SpreadJS GanttSheet JavaScript add-on allows developers to visually distinguish working and non-working time within project schedules to improve timeline clarity and scheduling accuracy. Using the nonWorkingTime properties, applications can customize the appearance of non-working periods by adjusting display modes, colors, and pattern styles across the Gantt chart timeline. Developers can configure visual indicators for weekends, holidays, shift gaps, maintenance windows, or off-hours scheduling scenarios, helping users quickly identify active work periods versus unavailable time. This makes project timelines easier to interpret in industries with complex scheduling requirements such as construction, manufacturing, logistics, engineering, and operations planning.

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• No Working Time Documentation

Working Time Configuration

GanttSheet allows developers to customize working time settings so project schedules accurately reflect real-world business hours, shifts, and operational calendars. Applications can modify built-in calendars, adjust workweeks, define custom working hours, and create nondefault work periods using the Calendar, WorkWeek, and WorkTime APIs. Developers can also expose working time configuration through the SpreadJS Designer, where users can visually update schedules, edit work periods, and create custom base calendars directly from the Project tab. This flexibility helps organizations manage scheduling requirements for construction crews, logistics operations, engineering teams, manufacturing schedules, and other workforce-driven planning environments.

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• Change Working Time Documentation

Calendar Customization

The SpreadJS GanttSheet add-on support calendar customization to help developers build scheduling applications that reflect real-world working schedules, shift patterns, holidays, and project timing rules. Applications can use built-in calendars such as Standard, Night Shift, and 24 Hours, or define custom calendars with the Calendar, WorkWeek, WorkTime, and CustomWorkWeek APIs. Developers can also configure project-level calendar settings such as week start, default start and finish times, hours per day, hours per week, days per month, duration units, and calculation precision. This allows users to generate more accurate project timelines for industries with varied scheduling needs, including construction, logistics, engineering, manufacturing, and media production.

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• Calendar Settings Documentation

Zoom & Scroll Support

The GanttSheet add-on provides flexible zoom and scrolling APIs that help developers build highly navigable project scheduling interfaces for large and complex timelines. Using the Timescale class, applications can scroll schedules by pixels, timeline ticks, date units, or specific target dates with methods such as scroll(), scrollBy(), scrollOneTick(), and scrollTo(). Developers can also control timeline scaling with built-in zoom operations including zoomIn(), zoomOut(), zoomAuto(), zoomTo(), and zoomToRange(). These controls make it easier for users to move between high-level project overviews and detailed task schedules while improving usability for construction planning, engineering timelines, logistics coordination, and other long-range scheduling workflows.

• View Zoom and Scroll Demos and Code
• Zoom and Scroll Documentation

Table Themes

This JavaScript spreadsheet add-on supports TableTheme styling to help developers create visually consistent project scheduling interfaces across the task table, timeline headers, and Gantt chart area. Using the applyTableTheme() method, developers can quickly apply coordinated styles for fonts, colors, alternating rows, headers, taskbar text, backgrounds, and gridlines throughout the scheduling experience. Theme styles also work alongside built-in task hierarchy formatting to visually distinguish project summaries, summary tasks, and standard tasks. Since themes act as a base styling layer, developers can still override specific taskbars, gridlines, and scheduling visuals using GanttSheet APIs and task style rules for deeper customization.

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• Table Themes Documentation

Task Bar Styling &Layout

GanttSheet provides flexible taskbar styling and layout controls that help developers build highly customized project timeline experiences. Developers can configure taskbar colors, shapes, patterns, text placement, milestone indicators, and summary task styling using built-in and custom task style rules. The TaskbarLayout class also allows applications to control dependency link line behavior, taskbar height, date text formatting, and whole-day rounding for task durations. With support for configurable link line modes, adjustable taskbar sizing, and custom scheduling visuals, GanttSheet makes it easier to create project management interfaces optimized for construction, logistics, engineering, media production, and other timeline-driven workflows.

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• Taskbar Styles and Taskbar Layout Documentation
• Designer Documentation

Gridline Customization

This JavaScript Gannt chart control provides configurable gridline styling options that help developers create clearer and more readable project scheduling interfaces. Developers can customize vertical and horizontal gridlines across timeline tiers, project start and finish dates, current date indicators, and task row separations using the GanttGridlines interface API. Gridline styles support custom line types, colors, and interval-based formatting to visually distinguish scheduling phases, milestone dates, and grouped task rows. With support for configurable timescale separators, project helper lines, and interval gridlines, applications can deliver more intuitive timeline visualization for complex scheduling and project management workflows.

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• Gridlines Documentation
• Designer Documentation

Conditional Styling

GanttSheet supports advanced conditional styling through built-in and custom taskbar style rules that dynamically change how tasks are displayed based on project data and scheduling logic. Developers can customize taskbar colors, shapes, patterns, borders, text placement, and milestone indicators for different task types such as summary tasks, manually scheduled tasks, milestones, and project summaries. Using the taskStyleRules collection and TaskbarStyleRule APIs, applications can automatically apply styles when tasks meet specific conditions like completion percentage, scheduling mode, or task hierarchy. This makes it easier for users to visually identify project status, risks, dependencies, and critical milestones across large scheduling environments.

• View Demo and Code
• Built-In Styles Documentation
• Designer Documentation

Theme-Based UI Rendering

This GanttSheet add-on supports theme-based UI rendering through GC.Spread.Sheets.Tables.TableTheme, allowing developers to apply consistent styling across the task list, timeline headers, and Gantt chart area. Themes automatically style elements such as column headers, alternating rows, fonts, gridlines, timeline backgrounds, and taskbar text while preserving built-in task hierarchy formatting for project summaries, summary tasks, and standard tasks. Developers can quickly apply themes using the applyTableTheme() method and retrieve active themes with getTableTheme(). Since TableThemes act as a base styling layer, GanttSheet-specific APIs and task style rules can override theme settings to support advanced customization of taskbars, gridlines, and scheduling visuals.

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• Table Themes Documentation

SpreadJS Designer Support

SpreadJS Designer support allows developers and power users to configure GanttSheet layouts, bindings, and scheduling behavior through a visual workbook interface. Users can insert a GanttSheet directly from the Designer ribbon, bind it to a DataSource table, and configure field mappings, hierarchy structures, task modes, and predecessor relationships using drag-and-drop tools. The Designer automatically attempts to map fields based on naming conventions and compatible data types, helping accelerate setup for project scheduling applications. Additional ribbon tabs for Tasks, Projects, Views, and Gantt Chart Formatting make it easier to customize timelines, taskbars, and scheduling behavior while keeping the GanttSheet aligned with the underlying data model.

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• GanttSheet Designer Documentation

Sheet Tab Integration

GanttSheet fits into the SpreadJS JavaScript workbook experience as a sheet-based project planning view, allowing developers to combine structured table data with interactive Gantt scheduling. Users can preview table data, column settings, calculated fields, visibility rules, and schema indicators before binding the data to a runtime GanttSheet. This sheet tab workflow helps teams validate project structures and then move into a full Gantt view for timeline planning, dependency tracking, and schedule management. Giving developers a practical way to deliver project scheduling features inside applications that already use spreadsheet-style navigation and data organization.

• GanttSheet Documentation

Excel Export

GanttSheet supports Excel export through the spread.export() method with exportXlsxOptions, allowing developers to generate .xlsx files from interactive project schedules. Data columns are exported as Excel tables, while the Gantt chart timeline is rendered as an image for easy sharing and viewing outside the application. Developers can preserve styles, formulas, and binding sources using export settings like includeBindingSource, includeStyles, and includeFormulas. This helps users share schedules and integrate project data into existing Excel-based workflows.

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• Save and Export Documentation