# Network - nodes

Handles the creation and deletion of nodes and contains the global node options and styles.

### Options

The options for the nodes have to be contained in an object titled 'nodes'. All of these options can be supplied per node as well. Obviously, 'id' should not be defined globally but per node. Options defined in the global nodes object, are applied to all nodes. If a node has options of its own, those will be used instead of the global options.

When you have given a node an option, you will override the global option for that property, and also the group option for that property if the node is in a group. If you then set that option to `null`, it will revert back to the default value.

Click on the full options or shorthand options to show how these options are supposed to be used.

    // these are all options in full.
    var options = {
      nodes:{
        borderWidth: 1,
        borderWidthSelected: 2,
        brokenImage:undefined,
        chosen: true,
        color: {
          border: '#2B7CE9',
          background: '#97C2FC',
          highlight: {
            border: '#2B7CE9',
            background: '#D2E5FF'
          },
          hover: {
            border: '#2B7CE9',
            background: '#D2E5FF'
          }
        },
        opacity: 1,
        fixed: {
          x:false,
          y:false
        },
        font: {
          color: '#343434',
          size: 14, // px
          face: 'arial',
          background: 'none',
          strokeWidth: 0, // px
          strokeColor: '#ffffff',
          align: 'center',
          multi: false,
          vadjust: 0,
          bold: {
            color: '#343434',
            size: 14, // px
            face: 'arial',
            vadjust: 0,
            mod: 'bold'
          },
          ital: {
            color: '#343434',
            size: 14, // px
            face: 'arial',
            vadjust: 0,
            mod: 'italic',
          },
          boldital: {
            color: '#343434',
            size: 14, // px
            face: 'arial',
            vadjust: 0,
            mod: 'bold italic'
          },
          mono: {
            color: '#343434',
            size: 15, // px
            face: 'courier new',
            vadjust: 2,
            mod: ''
          }
        },
        group: undefined,
        heightConstraint: false,
        hidden: false,
        icon: {
          face: 'FontAwesome',
          code: undefined,
          weight: undefined,
          size: 50,  //50,
          color:'#2B7CE9'
        },
        image: undefined,
        imagePadding: {
          left: 0,
          top: 0,
          bottom: 0,
          right: 0
        },
        label: undefined,
        labelHighlightBold: true,
        level: undefined,
        mass: 1,
        physics: true,
        scaling: {
          min: 10,
          max: 30,
          label: {
            enabled: false,
            min: 14,
            max: 30,
            maxVisible: 30,
            drawThreshold: 5
          },
          customScalingFunction: function (min,max,total,value) {
            if (max === min) {
              return 0.5;
            }
            else {
              let scale = 1 / (max - min);
              return Math.max(0,(value - min)*scale);
            }
          }
        },
        shadow:{
          enabled: false,
          color: 'rgba(0,0,0,0.5)',
          size:10,
          x:5,
          y:5
        },
        shape: 'ellipse',
        shapeProperties: {
          borderDashes: false, // only for borders
          borderRadius: 6,     // only for box shape
          interpolation: false,  // only for image and circularImage shapes
          useImageSize: false,  // only for image and circularImage shapes
          useBorderWithImage: false,  // only for image shape
          coordinateOrigin: 'center'  // only for image and circularImage shapes
        }
        size: 25,
        title: undefined,
        value: undefined,
        widthConstraint: false,
        x: undefined,
        y: undefined
      }
    }

    network.setOptions(options);

    // only the options that have shorthand notations are shown.
    var options = {
      nodes:{
        color: '#ff0000',
        fixed: false,
        font: '12px arial red',
        scaling: {
          label: true
        },
        shadow: true
      }
    }
    network.setOptions(options);

These options can also be set per individual node. All of the individual options are explained here:

Name | Type | Default | Description
--- | --- | --- | ---
borderWidth | Number | `1` | The width of the border of the node.
borderWidthSelected | Number | `2` | The width of the border of the node when it is selected. When undefined, the borderWidth * 2 is used.
brokenImage | String | `undefined` | When the shape is set to `image` or `circularImage`, this option can be an URL to a backup image in case the URL supplied in the image option cannot be resolved.
chosen | Object or Boolean | `true` | When true, selecting or hovering on a node will change it and its label's characteristics according to the default. When false, no change to the node or its label will occur when the node is chosen. If an object is supplied, finer-grained adjustment of node and label characteristics is available when a node is chosen.

chosen.node

Function or Boolean

undefined

When true, selecting or hovering on a node will change its characteristics according to the default. When false, no change to the node will occur when the node is chosen.

If a function is supplied, it is called when the node is chosen.

      function(values, id, selected, hovering) {
        values.property = chosenValue;
      }

Any of the incoming arguments may be used to determine characteristic changes. If a property is not specifically assigned by the supplied function, it will be left unchanged. A specific function may be assigned to each particular node in its options, or to all in the network's `nodes` options.

The properties define the characteristics that can be changed as follows:

Property | Node Reference
--- | ---
color | see color.background
borderWidth | see borderWidth
borderColor | see color.border
size | see size
borderDashes | see shapeProperties.borderDashes
borderRadius | see shapeProperties.borderRadius
shadow | see shadow.enabled
shadowColor | see shadow.color
shadowSize | see shadow.size
shadowX | see shadow.x
shadowY | see shadow.y

chosen.label

Function or Boolean

undefined

When true, selecting or hovering on a node will change its label's characteristics according to the default. When false, no change to the node's label will occur when the node is chosen.

If a function is supplied, it is called when the node is chosen.

      function(values, id, selected, hovering) {
        values.property = chosenValue;
      }

Any of the incoming arguments may be used to determine characteristic changes. If a property is not specifically assigned by the supplied function, it will be left unchanged. A specific function may be assigned to each particular node in its options, or to all in the network's `nodes` options.

The properties define the characteristics that can be changed as follows:

Property | Node Reference
--- | ---
color | see font.color
size | see font.size
face | see font.face
mod | font modifier ('bold', 'italic', etc.)
vadjust | see font.vadjust
strokeWidth | see font.strokeWidth
strokeColor | see font.strokeColor

color | Object or String | `Object` | The color object contains the color information of the node in every situation. When the node only needs a single color, a color value like `'rgba(120,32,14,1)'`, `'#ffffff'` or `'red'` can be supplied instead of an object.
color.border | String | `'#2B7CE9'` | The color of the border of the node when it is not selected or hovered over (assuming hover is enabled in the interaction module).
color.background | String | `'#D2E5FF'` | The color of the background of the node when it is not selected or hovered over (assuming hover is enabled in the interaction module).
color.highlight | Object or String | `Object` | The color of the node when it is selected. Alternatively, you can just supply a string color value.
color.highlight.border | String | `'#2B7CE9'` | The color of the border of the node when it is selected.
color.highlight.background | String | `'#D2E5FF'` | The color of the background of the node when it is selected.
color.hover | Object or String | `Object` | The color of the node when the mouse hovers over it (assuming hover is enabled in the interaction module). Shorthand like above is also supported.
color.hover.border | String | `'#2B7CE9'` | The color of the border of the node when the mouse hovers over it (assuming hover is enabled in the interaction module).
color.hover.background | String | `'#D2E5FF'` | The color of the background of the node when the mouse hovers over it (assuming hover is enabled in the interaction module).

ctxRenderer

Function

`undefined`

The function inputs and outputs look like:

    function ctxRenderer({ ctx, id, x, y, state: { selected, hover }, style, label }) {
      // do some math here
      return {
        // bellow arrows
        // primarily meant for nodes and the labels inside of their boundaries
        drawNode() {
          ctx.drawSomeNode();
        },
        // above arrows
        // primarily meant for labels outside of the node
        drawExternalLabel() {
          ctx.drawSomeTextOutsideOfTheNode();
        },
        // node dimensions defined by node drawing
        nodeDimensions: { width, height },
      };
    }

This function allows to draw any canvas shapes and lines (see guide to how to draw shapes here). This property is used only when the property `shape` is `'custom'`.

example:

    function({ ctx, x, y, state: { selected, hover }, style }) {
        const r = style.size;
        ctx.beginPath();
        const sides = 6;
        const a = (Math.PI * 2) / sides;
        ctx.moveTo(x , y + r);
        for (let i = 1; i < sides; i++) {
            ctx.lineTo(x + r * Math.sin(a * i), y + r * Math.cos(a * i));
        }
        ctx.closePath();
        ctx.save();
        ctx.fillStyle = 'red';
        ctx.fill();
        ctx.stroke();
        ctx.restore();

        ctx.font = "normal 12px sans-serif";
        ctx.fillStyle = 'black';
    }

opacity | Number | `undefined` | Overall opacity of a node (overrides any opacity on border, background, image, and shadow)
fixed | Object or Boolean | `Object` | When true, the node will not move but IS part of the physics simulation. When defined as an object, movement in either X or Y direction can be disabled.
fixed.x | Boolean | `false` | When true, the node will not move in the X direction.
fixed.y | Boolean | `false` | When true, the node will not move in the Y direction.
font | Object or String | `false` | This object defines the details of the label. A shorthand is also supported in the form `'size face color'` for example: `'14px arial red'`.
font.color | String | `'#343434'` | Color of the label text.
font.size | Number | `14` | Size of the label text.
font.face | String | `'arial'` | Font face (or font family) of the label text.
font.background | String | `undefined` | When not `undefined` but a color string, a background rectangle will be drawn behind the label in the supplied color.
font.strokeWidth | Number | `0` | As an alternative to the background rectangle, a stroke can be drawn around the text. When a value higher than 0 is supplied, the stroke will be drawn.
font.strokeColor | String | `'#ffffff'` | This is the color of the stroke assuming the value for stroke is higher than 0.
font.align | String | `'center'` | This can be set to 'left' to make the label left-aligned. Otherwise, defaults to 'center'.
font.vadjust | Number | `0` | A font-specific correction to the vertical positioning of the base font in the label text. (Positive is down.)

font.multi

Boolean or String

`false`

If `false`, the label is treated as pure text drawn with the base font. If `true` or `'html'` the label may be multifonted, with bold, italic and code markup, interpreted as html. If the value is `'markdown'` or `'md'` the label may be multifonted, with bold, italic and code markup, interpreted as markdown. The bold, italic, bold-italic and monospaced fonts may be set up under in the font.bold, font.ital, font.boldital and font.mono properties, respectively.

font.bold | Object or String | `false` | This object defines the details of the bold font in the label. A shorthand is also supported in the form `'size face color'` for example: `'14px arial red'`.
font.bold.color | String | `'#343434'` | Color of the bold font in the label text. Defaults to the base font's color.
font.bold.size | Number | `14` | Size of the bold font in the label text. Defaults to the base font's size.
font.bold.face | String | `'arial'` | Font face (or font family) of the bold font in the label text. Defaults to the base font's face.
font.bold.mod | String | `'bold'` | A string added to the face and size when determining the bold font in the label text.
font.bold.vadjust | Number | `0` | A font-specific correction to the vertical positioning of the bold font in the label text. (Positive is down.) Defaults to the base font's valign.
font.ital | Object or String | `false` | This object defines the details of the italic font in the label. A shorthand is also supported in the form `'size face color'` for example: `'14px arial red'`.
font.ital.color | String | `'#343434'` | Color of the italic font in the label text. Defaults to the base font's color.
font.ital.size | Number | `14` | Size of the italic font in the label text. Defaults to the base font's size.
font.ital.face | String | `'arial'` | Font face (or font family) of the italic font in the label text. Defaults to the base font's face.
font.ital.mod | String | `'italic'` | A string added to the face and size when determining the italic font in the label text.
font.ital.vadjust | Number | `0` | A font-specific correction to the vertical positioning of the italic font in the label text. (Positive is down.) Defaults to the base font's valign.
font.boldital | Object or String | `false` | This object defines the details of the bold italic font in the label. A shorthand is also supported in the form `'size face color'` for example: `'14px arial red'`.
font.boldital.color | String | `'#343434'` | Color of the bold italic font in the label text. Defaults to the base font's color.
font.boldital.size | Number | `14` | Size of the bold italic font in the label text. Defaults to the base font's size.
font.boldital.face | String | `'arial'` | Font face (or font family) of the bold italic font in the label text. Defaults to the base font's face.
font.boldital.mod | String | `'bold'` | A string added to the face and size when determining the bold italic font in the label text.
font.boldital.vadjust | Number | `0` | A font-specific correction to the vertical positioning of the bold italic font in the label text. (Positive is down.) Defaults to the base font's valign.
font.mono | Object or String | `false` | This object defines the details of the monospaced font in the label. A shorthand is also supported in the form `'size face color'` for example: `'15px courier red'`.
font.mono.color | String | `'#343434'` | Color of the monospaced font in the label text. Defaults to the base font's color.
font.mono.size | Number | `15` | Size of the monospaced font in the label text. Defaults to the base font's size.
font.mono.face | String | `'courier new'` | Font face (or font family) of the monospaced font in the label text.
font.mono.mod | String | `''` | A string added to the face and size when determining the monospaced font in the label text.
font.mono.vadjust | Number | `2` | A font-specific correction to the vertical positioning of the monospaced font in the label text. (Positive is down.) Defaults to the base font's valign.
group | String | `undefined` | When not `undefined`, the node will belong to the defined group. Styling information of that group will apply to this node. Node specific styling overrides group styling.
heightConstraint | Number, Boolean or Object | `false` | If false, no heightConstraint is applied. If a number is specified, the value is used as the minimum height of the node. The node's height will be set to the minimum if less than the value.
heightConstraint.minimum | Number | `undefined` | If a number is specified, the value is used as the minimum height of the node. The node's height will be set to the minimum if less than the value.
heightConstraint.valign | String | `'middle'` | Valid values are `'top'`, `'middle'`, and `'bottom'`. When specified, if the height of the label text is less than the minimum (including any top or bottom margins), it will be offset vertically to the designated position.
hidden | Boolean | `false` | When true, the node will not be shown. It will still be part of the physics simulation though!
icon | Object | `Object` | These options are only used when the shape is set to `icon`.
icon.face | String | `'FontAwesome'` | These options are only used when the shape is set to `icon`. The possible values for the face option are any font faces that are loaded on given page such as `'FontAwesome'` or `'Ionicons'`.
icon.code | String | `undefined` | This is the code of the icon, for example `'\uf007'`.
icon.size | Number | `50` | The size of the icon.
icon.color | String | `'#2B7CE9'` | The color of the icon.
icon.weight | Number or String | `undefined` | This allows for weight to be forced regardless of selection status. For example Font Awesome 5 doesn't work properly unless weight is forced to `'bold'` or `700`. If this option is set then selection is indicated by bigger size instead of bold font face.
id | Number or String | `undefined` | The id of the node. The id is mandatory for nodes and they have to be unique. This should obviously be set per node, not globally.
image | Object or String | `undefined` | When the shape is set to `image` or `circularImage`, this option should be the URL to an image. If the image cannot be found, the brokenImage option can be used. Note: Firefox has a SVG drawing bug, there is a workaround - add width/height attributes to root <svg> element of the SVG.
image.unselected | String | `undefined` | Unselected (default) image URL.
image.selected | String | `undefined` | Selected image URL.
imagePadding | Object or Number | `0` | If a number is specified, the paddings of the image inside the shape are set to that value on all sides. These options are only used when the shape is set to `image`, `circularImage`.
imagePadding.top | Number | `0` | The top padding of the image inside the shape is set to this value.
imagePadding.right | Number | `0` | The right margin of the image inside the shape is set to this value.
imagePadding.bottom | Number | `0` | The bottom margin of the image inside the shape is set to this value.
imagePadding.left | Number | `0` | The left margin of the image inside the shape is set to this value.
label | String | `undefined` | The label is the piece of text shown in or under the node, depending on the shape.
labelHighlightBold | Boolean | `true` | Determines whether or not the label becomes bold when the node is selected.
level | Number | `undefined` | When using the hierarchical layout, the level determines where the node is going to be positioned.
margin | Object or Number | `5` | If a number is specified, the margins of the label are set to that value on all sides. These options are only used when the shape is set to `box`, `circle`, `database`, `icon` or `text`.
margin.top | Number | `5` | The top margin of the label is set to this value.
margin.right | Number | `5` | The right margin of the label is set to this value.
margin.bottom | Number | `5` | The bottom margin of the label is set to this value.
margin.left | Number | `5` | The left margin of the label is set to this value.
mass | Number | `1` | The barnesHut physics model (which is enabled by default) is based on an inverted gravity model. By increasing the mass of a node, you increase it's repulsion. Values between 0 and 1 are not recommended. Negative or zero values are not allowed. These will generate a console error and will be set to 1.
physics | Boolean | `true` | When false, the node is not part of the physics simulation. It will not move except for from manual dragging.

scaling

Object

`Object`

If the `value` option is specified, the size of the nodes will be scaled according to the properties in this object. All node shapes can be scaled, but some only when label scaling is enabled as their size is based on the size of the label. Only scalable when label scaling is enabled are: `ellipse`, `circle`, `database`, `box`, `text`. Always scalable are: `image`, `circularImage`, `diamond`, `dot`, `star`, `triangle`, `triangleDown`, `hexagon`, `square` and `icon`. Keep in mind that when using scaling, the `size` option is neglected.

scaling.min | Number | `10` | If nodes have a value, their sizes are determined by the value, the scaling function and the min max values. The min value is the minimum allowed value.
scaling.max | Number | `30` | This is the maximum allowed size when the nodes are scaled using the value option.
scaling.label | Object or Boolean | `Object` | This can be false if the label is not allowed to scale with the node. If true it will scale using default settings. For further customization, you can supply an object.
scaling.label.enabled | Boolean | `false` | Toggle the scaling of the label on or off. If this option is not defined, it is set to true if any of the properties in this object are defined.
scaling.label.min | Number | `14` | The minimum font-size used for labels when scaling.
scaling.label.max | Number | `30` | The maximum font-size used for labels when scaling.
scaling.label.maxVisible | Number | `30` | When zooming in, the font is drawn larger as well. You can limit the perceived font size using this option. If set to 30, the font will never look larger than size 30 zoomed at 100%.
scaling.label.drawThreshold | Number | `5` | When zooming out, the font will be drawn smaller. This defines a lower limit for when the font is drawn. When using font scaling, you can use this together with the maxVisible to first show labels of important nodes when zoomed out and only show the rest when zooming in.

scaling.customScalingFunction

Function

in description

If nodes have `value` fields, this function determines how the size of the nodes are scaled based on their values. The default function is:

    function (min,max,total,value) {
      if (max === min) {
        return 0.5;
      }
      else {
        var scale = 1 / (max - min);
        return Math.max(0,(value - min)*scale);
      }
    }

The function receives the minimum value of the set, the maximum value, the total sum of all values and finally the value of the node or edge it works on. It has to return a value between 0 and 1. The nodes and edges then calculate their size as follows:

    var scale = customScalingFunction(min,max,total,value);
    var diff = maxSize - minSize;
    mySize = minSize + diff * scale;

Please note: `maxSize` and `minSize` are the values `scaling.max` and `scaling.min` provided in the options.

shadow | Object or Boolean | `Object` | When true, the node casts a shadow using the default settings. This can be further refined by supplying an object.
shadow.enabled | Boolean | `false` | Toggle the casting of shadows. If this option is not defined, it is set to true if any of the properties in this object are defined.
shadow.color | String | `'rgba(0,0,0,0.5)'` | The color size of the shadow as a string. Supported formats are 'rgb(255,255,255)', 'rgba(255,255,255,1)' and '#FFFFFF'.
shadow.size | Number | `10` | The blur size of the shadow.
shadow.x | Number | `5` | The x offset.
shadow.y | Number | `5` | The y offset.

shape

String

`'ellipse'`

The shape defines what the node looks like. There are three types of nodes. One type has the label inside of it and the other type has the label underneath it. The third type is a custom shape you can draw whatever you want to represent the node.

The types with the label inside of it are: `ellipse`, `circle`, `database`, `box`, `text`.

The ones with the label outside of it are: `image`, `circularImage`, `diamond`, `dot`, `star`, `triangle`, `triangleDown`, `hexagon`, `square` and `icon`.

If none of these shapes suffice, you can use the `custom` shape which will allow you to create your own shape rendered via `ctxRenderer` option.

shapeProperties | Object | `Object` | This object contains configuration for specific shapes.
shapeProperties.borderDashes | Array or Boolean | `false` | This property applies to all shapes that have borders. You set the dashes by supplying an Array. Array format: [dash length, gap length]. You can also use a Boolean, false is disable and true is default [5,15].
shapeProperties.borderRadius | Number | `6` | This property is used only for the `box` shape. It allows you to determine the roundness of the corners of the shape.
shapeProperties.interpolation | Boolean | `true` | This property only applies to the `image` and `circularImage` shapes. When true, the image is resampled when scaled down, resulting in a nicer image at the cost of computational time.
shapeProperties.useImageSize | Boolean | `false` | This property only applies to the `image` and `circularImage` shapes. When false, the size option is used, when true, the size of the image is used. Important: if this is set to true, the image cannot be scaled with the value option!
shapeProperties.useBorderWithImage | Boolean | `false` | This property only applies to the `image` shape. When true, the color object is used. A rectangle with the background color is drawn behind it and it has a border. This means all border options are taken into account.
shapeProperties.coordinateOrigin | String | `'center'` | This property only applies to the `image` and `circularImage` shapes. Decides if the (x, y) of the node will be the `center` of the image, or the `top-left` corner.
size | Number | `25` | The size is used to determine the size of node shapes that do not have the label inside of them. These shapes are: `image`, `circularImage`, `diamond`, `dot`, `star`, `triangle`, `triangleDown`, `hexagon`, `square` and `icon`
title | String or Element | `undefined` | Title to be displayed in a pop-up when the user hovers over the node. The title can be an HTML element or a string containing plain text. See HTML in titles exmample if you want to parse HTML.
value | Number | `undefined` | When a value is set, the nodes will be scaled using the options in the scaling object defined above.
widthConstraint | Number, Boolean or Object | `false` | If false, no widthConstraint is applied. If a number is specified, the minimum and maximum widths of the node are set to the value. The node's label's lines will be broken on spaces to stay below the maximum and the node's width will be set to the minimum if less than the value.
widthConstraint.minimum | Number | `undefined` | If a number is specified, the minimum width of the node is set to the value. The node's width will be set to the minimum if less than the value.
widthConstraint.maximum | Number | `undefined` | If a number is specified, the maximum width of the node is set to the value. The node's label's lines will be broken on spaces to stay below the maximum.

x

Number

`undefined`

This gives a node its initial position on the x axis. When using hierarchical layout, this value has no effect. When using stabilization, the stabilized position may be different from the initial one (the node will start at this position but may move to different location based on the stabilization configuration). To lock the node to this position, turn off physics or set `fixed.x` node option to true.

y

Number

`undefined`

This gives a node its initial position on the y axis. When using hierarchical layout, this value has no effect. When using stabilization, the stabilized position may be different from the initial one (the node will start at this position but may move to different location based on the stabilization configuration). To lock the node to this position, turn off physics or set `fixed.y` node option to true.

Third party docs: