# 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,
        color: {
          border: '#2B7CE9',
          background: '#97C2FC',
          highlight: {
            border: '#2B7CE9',
            background: '#D2E5FF'
          },
          hover: {
            border: '#2B7CE9',
            background: '#D2E5FF'
          }
        },
        fixed: {
          x:false,
          y:false
        },
        font: {
          color: '#343434',
          size: 14, // px
          face: 'arial',
          background: 'none',
          strokeWidth: 0, // px
          strokeColor: '#ffffff',
          align: 'center'
        },
        group: undefined,
        hidden: false,
        icon: {
          face: 'FontAwesome',
          code: undefined,
          size: 50,  //50,
          color:'#2B7CE9'
        },
        image: undefined,
        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
        }
        size: 25,
        title: undefined,
        value: undefined,
        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.
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 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 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).
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'.
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.
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 options for the face are: `'FontAwesome'` and `'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.
id | 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 | 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.
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.
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 lower than 1 are not recommended.
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`, `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 settigns. 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 two types of nodes. One type has the label inside of it and the other type has the label underneath it. 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`, `square` and `icon`.

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 formart: [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 computional 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.
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`, `square` and `icon`
title | String or Element | `undefined` | Title to be displayed when the user hovers over the node. The title can be an HTML element or a string containing plain text or HTML.
value | Number | `undefined` | When a value is set, the nodes will be scaled using the options in the scaling object defined above.
x | Number | `undefined` | This gives a node an initial x position. When using the hierarchical layout, either the x or y position is set by the layout engine depending on the type of view. The other value remains untouched. When using stabilization, the stabilized position may be different from the initial one. To lock the node to that position use the physics or fixed options.
y | Number | `undefined` | This gives a node an initial y position. When using the hierarchical layout, either the x or y position is set by the layout engine depending on the type of view. The other value remains untouched. When using stabilization, the stabilized position may be different from the initial one. To lock the node to that position use the physics or fixed options.