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One of the strengths of jsPlumb's approach is that the elements it creates can be easily styled with CSS. On this page we'll first run through the default CSS classes that jsPlumb attaches, followed by a quick explanation for how to attach your own, and then we'll discuss how to style SVG.

Z Index#

One thing you can - and should - use CSS for, regardless of the renderer, is z-index. Every connector, endpoint and overlay in jsPlumb adds some element to the UI, and you should take care to establish appropriate z-indices for each of these, in conjunction with the elements in your application.

Basic CSS classes#

By default, jsPlumb adds a specific class to each of the three types of elements it creates

ComponentCSS Class
Connector Outlinejtk-connector-outline
Endpoint when fulljtk-endpoint-full

In a simple UI, you can set appropriate z-index values for these classes. The jsPlumb demo pages, for instance, typically use a class of .window for the elements in each demo page, and the z-index of the UI is controlled with CSS rules like this:

.window { z-index:20; }.jtk-connector { z-index:4; }.jtk-endpoint { z-index:5; }.jtk-overlay { z-index:6; }

Interactive CSS Classes#

jsPlumb assigns these classes on both Connectors and Endpoints when specific user interactivity occurs:

ActivityCSS ClassDescription
Mouse Hoverjtk-hoverAssigned to both connectors and endpoints when the mouse is hovering over them
Connection Dragjtk-draggingAssigned to a connector when it is being dragged (either for a new connection or an existing connection), and to the source endpoint when a new connection is being dragged
Connected endpointjtk-endpoint-connectedAssigned to an endpoint that has one or more connections. Not assigned to floating endpoints (endpoints that are being dragged)
Full endpointjtk-endpoint-fullAssigned to an endpoint that can accept no more connections.
Floating endpointjtk-floating-endpointAssigned to a "floating" endpoint, ie. an endpoint that is being dragged as the source or target of some new or existing connection
Element Draggingjtk-element-draggingAssigned to all connections whose source or target element is currently being dragged, and to their endpoints.
Source Element Draggingjtk-source-element-draggingAssigned to all connections whose source element is being dragged, and to their endpoints
Target Element Draggingjtk-target-element-draggingAssigned to all connections whose target element is being dragged, and to their endpoints
Anchor Classjtk-endpoint-anchor-Assigned to endpoints, and their associated elements, that have either a static anchor with an associated class, or a dynamic anchor whose individual locations have an associated CSS class. The value shown above is the prefix of the class, and the specific anchor class is appended to that value. Note that this class is added to both the artifact that jsPlumb creates and also the element on which the endpoint resides, so you will normally have to build a selector with more criteria than just this class in order to target things properly. See the documentation regarding anchors for a discussion of this.
Drop Allowed on Endpointjtk-endpoint-drop-allowedAssigned to an endpoint when another endpoint is hovering over it and a drop would be allowed
Drop Forbidden on Endpointjtk-endpoint-drop-forbiddenAssigned to an endpoint when another endpoint is hovering over it and a drop would not be allowed
Connection Hoverjtk-source-hoverAssigned to the source element in a connection when the mouse is hovering over the connection
Connection Hoverjtk-target-hoverAssigned to the target element in a connection when the mouse is hovering over the connection
Dragjtk-drag-selectAssigned to the document body whenever a drag is in progress. It allows you to ensure document selection is disabled - see here


Preventing selection while dragging#

jsPlumb puts a class on the body that you can use to disable the default browser behaviour of selecting DOM elements when dragging:


A suitable value for this (from the jsPlumb demos) is:

.jtk-drag-select {  -webkit-touch-callout: none;  -webkit-user-select: none;  -khtml-user-select: none;  -moz-user-select: none;  -ms-user-select: none;  user-select: none;    }

Custom CSS Classes#

In addition to the default CSS classes, each of the main methods you use to configure endpoints or make connections in jsPlumb support the following two parameters:

  • cssClass - class(es) to set on the display elements. Use a space to separate multiple values.
  • hoverClass - class(es) to set on the display elements when in hover mode

CSS for SVG elements#


SVG connections in jsPlumb consist of a parent svg element, inside of which there are one or more path elements, depending on whether or not you have specified an outlineStyle. To target the path element for some connection, you need a rule like this:

svg path {  stroke:red;}

Hooking this up to the custom class mechanism, you might do something like this:

instance.connect({  source:someElement,  target:someOtherElement,  cssClass:"redLine"});


svg.redLine path {  stroke:red;  stroke-width:3;}

You might be thinking to yourself, why have the svg and path elements in this? In fact they are perhaps not required: they're just there to call out the fact that this is a style on an SVG connector.


SVG Endpoints created by jsPlumb consist of a div, inside of which is an svg parent element, inside of which there is some shape, the tag name of which depends on the type of Endpoint:

Endpoint TypeSVG Shape

So you can choose, when writing CSS rules for these, whether or not you specify the shape exactly, or just leave it up to a wildcard:

instance.addEndpoint(someElement, {  cssClass:"aRedEndpoint",  endpoint:"Dot"});


.aRedEndpoint svg circle {  fill:red;  stroke:yellow;}


.aRedEndpoint svg * {  fill:red;  stroke:yellow;}

For a full discussion of the properties you can configure on an SVG element via CSS, we refer you to the SVG spec