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var split = new MultiSplitPane(el, opts)

Create a new MultiSplitPane rooted in empty DOM element el. Supported options:

  • orientation: either MultiSplitPane.VERTICAL or MultiSplitPane.HORIZONTAL
  • scheduleRender: called the split pane needs to redraw its internal structure. Callback receives a single function which it can either invoke immediately or schedule to call with e.g. requestAnimationFrame().
  • onPaneResize: a function that will be called when panes are resized
  • attachWidget/detachWidget: callback functions for attaching/detaching child widgets added to the split pane. Signature is (parentElement, widget). Default is to assume widget is a DOM element and perform e.g. parentElement.appendChild(widget).
  • setWidgetBounds: callback function used to resize a widget; signature is (widget, x, y, width, height). Default is to assume widget is a DOM element and set its dimensions directly.


Schedule a layout operation. Use the scheduleRender constructor operation to control when layout actually occurs.


Layout the split pane immediately. It's not normally necessary to call this function manually.


orientation is one of MultiSplitPane.VERTICAL or MultiSplitPane.HORIZONTAL.


split.addSplit(ratio, [widget])



split.setWidgetAtIndex(ix, widget)

Example CSS

The root split-pane class can be substituted by whatever you want; it is not set by the constructor.

.split-pane > .split-pane-divider {
    position: absolute;
    background-color: black;
.split-pane > .split-pane-ghost {
    background-color: #ff3300;
    opacity: 0.7;
.split-pane.horizontal > .split-pane-divider {
    left: 0; right: 0;
    height: 8px;
    cursor: row-resize;
.split-pane.vertical > .split-pane-divider {
    top: 0; bottom: 0;
    width: 8px;
    cursor: col-resize;

Copyright & License

© 2014 Jason Frame [ @jaz303 / ]

Released under the ISC license.