create-gojs-kit
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A CLI for downloading GoJS samples, extensions, and docs
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<meta name="description" content="When the mouse hovers over a node, show a set of Buttons that could perform various actions." />
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<meta itemprop="name" content="Buttons Shown on Hover over Node" />
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<title>
Buttons Shown on Hover over Node | GoJS Diagramming Library
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<script src="https://cdn.jsdelivr.net/npm/gojs@3.1.0"></script>
<div id="allSampleContent" class="p-4 w-full">
<script id="code">
function init() {
myDiagram = new go.Diagram('myDiagramDiv', {
hoverDelay: 200, // controls how long to wait motionless (msec) before showing Adornment
'undoManager.isEnabled': true // enable undo & redo
});
// this is shown by the mouseHover event handler
var nodeHoverAdornment =
new go.Adornment('Spot', {
//background: "transparent",
// hide the Adornment when the mouse leaves it
mouseLeave: (e, obj) => {
var ad = obj.part;
ad.adornedPart.removeAdornment('mouseHover');
}
})
.add(
new go.Placeholder({
//background: "transparent", // to allow this Placeholder to be "seen" by mouse events
isActionable: true, // needed because this is in a temporary Layer
click: (e, obj) => {
var node = obj.part.adornedPart;
node.diagram.select(node);
}
}),
go.GraphObject.build('Button', {
alignment: go.Spot.Left, alignmentFocus: go.Spot.Right,
click: (e, obj) => alert('Hi!')
})
.add(new go.TextBlock('Hi!')),
go.GraphObject.build('Button', {
alignment: go.Spot.Right, alignmentFocus: go.Spot.Left,
click: (e, obj) => alert('Bye')
})
.add(new go.TextBlock('Bye'))
);
// define a simple Node template
myDiagram.nodeTemplate =
new go.Node('Auto', { // the Shape will go around the TextBlock
// show the Adornment when a mouseHover event occurs
mouseHover: (e, obj) => {
var node = obj.part;
nodeHoverAdornment.adornedObject = node;
node.addAdornment('mouseHover', nodeHoverAdornment);
}
})
.add(
new go.Shape('RoundedRectangle', { strokeWidth: 0 })
// Shape.fill is bound to Node.data.color
.bind('fill', 'color'),
new go.TextBlock({ margin: 8 }) // some room around the text
// TextBlock.text is bound to Node.data.text
.bind('text')
);
// but use the default Link template, by not setting Diagram.linkTemplate
// create the model data that will be represented by Nodes and Links
myDiagram.model = new go.GraphLinksModel(
[
{ key: 1, text: 'Alpha', color: 'lightblue' },
{ key: 2, text: 'Beta', color: 'orange' },
{ key: 3, text: 'Gamma', color: 'lightgreen' },
{ key: 4, text: 'Delta', color: 'pink' }
],
[
{ from: 1, to: 2 },
{ from: 1, to: 3 },
{ from: 2, to: 2 },
{ from: 3, to: 4 },
{ from: 4, to: 1 }
]
);
}
window.addEventListener('DOMContentLoaded', init);
</script>
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width: 400px; height: 400px"></div>
<p>
This sample demonstrates buttons that appear when the user hovers over a node with the mouse. The advantage of using an <a>Adornment</a> is that it keeps
the Node template simpler. That means there are less resources used to create nodes -- only that one adornment can be shown.
</p>
<p>
However, using a template as the <a>Part.selectionAdornmentTemplate</a> would allow for more than one set of buttons to be shown simultaneously, one set for
each selected node.
</p>
<p>This technique does not work on touch devices.</p>
<p>
If you want to show such an Adornment on mouseEnter and mouseLeave, rather than on mouseHover, the code is given in the documentation for the
<a>GraphObject.mouseEnter</a> property.
</p>
</div>
</div>
<!-- * * * * * * * * * * * * * -->
<!-- End of GoJS sample code -->
</div>
<div id="allTagDescriptions" class="p-4 w-full max-w-screen-xl mx-auto">
<hr/>
<h3 class="text-xl">GoJS Features in this sample</h3>
<!-- blacklist tags that do not correspond to a specific GoJS feature -->
<h4>Buttons</h4>
<p>
GoJS defines several <a href="../api/symbols/Panel.html" target="api">Panel</a>s for common uses.
These include "Button", "TreeExpanderButton", "SubGraphExpanderButton", "PanelExpanderButton", "ContextMenuButton", and "CheckBoxButton".
"ContextMenuButton"s are typically used inside of "ContextMenu" Panels;
"CheckBoxButton"s are used in the implementation of "CheckBox" Panels.
</p>
<p>
These predefined panels can be used as if they were <a href="../api/symbols/Panel.html" target="api">Panel</a>-derived classes in calls to <a href="../api/symbols/GraphObject.html#build" target="api">GraphObject.build</a>.
They are implemented as simple visual trees of <a href="../api/symbols/GraphObject.html" target="api">GraphObject</a>s in <a href="../api/symbols/Panel.html" target="api">Panel</a>s,
with pre-set properties and event handlers.
</p>
<p>
More information can be found in the <a href="../intro/buttons.html">GoJS Intro</a>.
</p>
<p>
<a href="../samples/index.html#buttons">Related samples</a>
</p>
<hr>
</div>
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