gojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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HTML
<html>
<head>
<meta charset="UTF-8">
<title>Buttons that show on Hover</title>
<meta name="description" content="When the mouse hovers over a node, show a set of Buttons that could perform various actions." />
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
<script src="../release/go.js"></script>
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
<script id="code">
function init() {
if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
var $ = go.GraphObject.make; // for conciseness in defining templates
myDiagram = $(go.Diagram, "myDiagramDiv", // create a Diagram for the DIV HTML element
{
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 =
$(go.Adornment, "Spot",
{
background: "transparent",
// hide the Adornment when the mouse leaves it
mouseLeave: function(e, obj) {
var ad = obj.part;
ad.adornedPart.removeAdornment("mouseHover");
}
},
$(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: function(e, obj) {
var node = obj.part.adornedPart;
node.diagram.select(node);
}
}),
$("Button",
{ alignment: go.Spot.Left, alignmentFocus: go.Spot.Right },
{ click: function(e, obj) { alert("Hi!"); } },
$(go.TextBlock, "Hi!")),
$("Button",
{ alignment: go.Spot.Right, alignmentFocus: go.Spot.Left },
{ click: function(e, obj) { alert("Bye"); } },
$(go.TextBlock, "Bye"))
);
// define a simple Node template
myDiagram.nodeTemplate =
$(go.Node, "Auto", // the Shape will go around the TextBlock
$(go.Shape, "RoundedRectangle", { strokeWidth: 0 },
// Shape.fill is bound to Node.data.color
new go.Binding("fill", "color")),
$(go.TextBlock,
{ margin: 8 }, // some room around the text
// TextBlock.text is bound to Node.data.key
new go.Binding("text", "key")),
{ // show the Adornment when a mouseHover event occurs
mouseHover: function(e, obj) {
var node = obj.part;
nodeHoverAdornment.adornedObject = node;
node.addAdornment("mouseHover", nodeHoverAdornment);
}
}
);
// 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: "Alpha", color: "lightblue" },
{ key: "Beta", color: "orange" },
{ key: "Gamma", color: "lightgreen" },
{ key: "Delta", color: "pink" }
],
[
{ from: "Alpha", to: "Beta" },
{ from: "Alpha", to: "Gamma" },
{ from: "Beta", to: "Beta" },
{ from: "Gamma", to: "Delta" },
{ from: "Delta", to: "Alpha" }
]);
}
</script>
</head>
<body onload="init()">
<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>
</body>
</html>