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The HTML5 JavaScript Splitter is a layout user interface (UI) control that has multiple resizable panes. It is used to create different complex layouts in the web application by using multiple and nested panes. The orientation of the pane can be either horizontal or vertical. Users can integrate their child controls or content within the panes.

Resizable panes

The JavaScript Splitter control has built-in resizable support that helps widen or shrink the panes. Users can control the resize behavior for individual panes with min and max size validation.

JavaScript splitter resizable support

JavaScript splitter with multiple panes

Multiple panes

Users can configure more than 2 panes to construct different layouts using JavaScript Splitter control such as Outlook-style, Windows explorer-style, Visual Studio code-style, and more.

Content as JavaScript UI controls

Users can integrate other JavaScript UI controls (For example: TreeView, ListView, Rich Text Editor), HTML markup, or plain text content in the split panes.

Splitter integrated over other JavaScript UI controls

JavaScript splitter orientation of the split panes

Vertical or horizontal orientation

The orientation of the split panes can either be horizontal or vertical inside the JavaScript Splitter control.

Nested JavaScript Splitter

Splitters can be nested in various levels within the pane to create complex layout such as code editor-style layout.

JavaScript splitter with nested layout

JavaScript splitter with split bar

Separator (Divider)

The JavaScript Splitter control has a split bar to visually split the panes that contains resize gripper.

Sizing to content

Users can specify pane size either in pixels or in percentage values including min and max range values to accommodate the sizing to its child control or content.

JavaScript splitter with sizing to content

JavaScript splitter with right-to-left mode

Right-to-Left (RTL)

The JavaScript Splitter control supports right-to-left (RTL) rendering. Users can change the text direction and layout of the Splitter control from right to left. It improves the user experience and accessibility for users who use RTL languages.


The JavaScript Splitter control has several built-in themes such as material, bootstrap, fabric (Office 365), and high contrast. Users can customize any one of these built-in themes or create new themes to achieve their own desired look and feel either by simply overriding SASS variables or using our Theme Studio application.


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