markgojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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HTML
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>HTML Context Menu</title>
<meta name="description" content="Context menus implemented in HTML rather than as GoJS objects." />
<!-- Copyright 1998-2019 by Northwoods Software Corporation. -->
<meta charset="UTF-8">
<style type="text/css">
/* CSS for the traditional context menu */
#contextMenu {
z-index: 10001;
position: absolute;
left: 5px;
border: 1px solid #444;
background-color: #F5F5F5;
display: none;
box-shadow: 0 0 10px rgba( 0, 0, 0, .4 );
font-size: 12px;
font-family: sans-serif;
font-weight: bold;
}
#contextMenu ul {
list-style: none;
top: 0;
left: 0;
margin: 0;
padding: 0;
}
#contextMenu li a {
position: relative;
min-width: 60px;
color: #444;
display: inline-block;
padding: 6px;
text-decoration: none;
cursor: pointer;
}
#contextMenu li:hover {
background: #CEDFF2;
color: #EEE;
}
#contextMenu li ul li {
display: none;
}
#contextMenu li ul li a {
position: relative;
min-width: 60px;
padding: 6px;
text-decoration: none;
cursor: pointer;
}
#contextMenu li:hover ul li {
display: block;
margin-left: 0px;
margin-top: 0px;
}
</style>
<script src="../release/go.js"></script>
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
<script id="code">
var myDiagram = null;
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
{ initialContentAlignment: go.Spot.Center, "undoManager.isEnabled": true });
// This is the actual HTML context menu:
var cxElement = document.getElementById("contextMenu");
// Since we have only one main element, we don't have to declare a hide method,
// we can set mainElement and GoJS will hide it automatically
var myContextMenu = $(go.HTMLInfo, {
show: showContextMenu,
mainElement: cxElement
});
// define a simple Node template (but use the default Link template)
myDiagram.nodeTemplate =
$(go.Node, "Auto",
{ contextMenu: myContextMenu },
$(go.Shape, "RoundedRectangle",
// Shape.fill is bound to Node.data.color
new go.Binding("fill", "color")),
$(go.TextBlock,
{ margin: 3 }, // some room around the text
// TextBlock.text is bound to Node.data.key
new go.Binding("text", "key"))
);
// create the model data that will be represented by Nodes and Links
myDiagram.model = new go.GraphLinksModel(
[
{ key: "Alpha", color: "crimson" },
{ key: "Beta", color: "chartreuse" },
{ key: "Gamma", color: "aquamarine" },
{ key: "Delta", color: "gold" }
],
[
{ from: "Alpha", to: "Beta" },
{ from: "Alpha", to: "Gamma" },
{ from: "Beta", to: "Beta" },
{ from: "Gamma", to: "Delta" },
{ from: "Delta", to: "Alpha" }
]);
myDiagram.contextMenu = myContextMenu;
// We don't want the div acting as a context menu to have a (browser) context menu!
cxElement.addEventListener("contextmenu", function(e) {
e.preventDefault();
return false;
}, false);
function showContextMenu(obj, diagram, tool) {
// Show only the relevant buttons given the current state.
var cmd = diagram.commandHandler;
document.getElementById("cut").style.display = cmd.canCutSelection() ? "block" : "none";
document.getElementById("copy").style.display = cmd.canCopySelection() ? "block" : "none";
document.getElementById("paste").style.display = cmd.canPasteSelection() ? "block" : "none";
document.getElementById("delete").style.display = cmd.canDeleteSelection() ? "block" : "none";
document.getElementById("color").style.display = (obj !== null ? "block" : "none");
// Now show the whole context menu element
cxElement.style.display = "block";
// we don't bother overriding positionContextMenu, we just do it here:
var mousePt = diagram.lastInput.viewPoint;
cxElement.style.left = mousePt.x + "px";
cxElement.style.top = mousePt.y + "px";
}
}
// This is the general menu command handler, parameterized by the name of the command.
function cxcommand(event, val) {
if (val === undefined) val = event.currentTarget.id;
var diagram = myDiagram;
switch (val) {
case "cut": diagram.commandHandler.cutSelection(); break;
case "copy": diagram.commandHandler.copySelection(); break;
case "paste": diagram.commandHandler.pasteSelection(diagram.lastInput.documentPoint); break;
case "delete": diagram.commandHandler.deleteSelection(); break;
case "color": {
var color = window.getComputedStyle(document.elementFromPoint(event.clientX, event.clientY).parentElement)['background-color'];
changeColor(diagram, color); break;
}
}
diagram.currentTool.stopTool();
}
// A custom command, for changing the color of the selected node(s).
function changeColor(diagram, color) {
// Always make changes in a transaction, except when initializing the diagram.
diagram.startTransaction("change color");
diagram.selection.each(function(node) {
if (node instanceof go.Node) { // ignore any selected Links and simple Parts
// Examine and modify the data, not the Node directly.
var data = node.data;
// Call setDataProperty to support undo/redo as well as
// automatically evaluating any relevant bindings.
diagram.model.setDataProperty(data, "color", color);
}
});
diagram.commitTransaction("change color");
}
</script>
</head>
<body onload="init()">
<div id="sample">
<div style="display: inline-block;">
<!-- We make a div to contain both the Diagram div and the context menu (such that they are siblings)
so that absolute positioning works easily.
This DIV containing both MUST have a non-static CSS position (we use position: relative)
so that our context menu's absolute coordinates work correctly. -->
<div style="position: relative;" >
<div id="myDiagramDiv" style="border: solid 1px black; width:400px; height:400px"></div>
<div id="contextMenu">
<ul>
<li id="cut" onclick="cxcommand(event)"><a href="#" target="_self">Cut</a></li>
<li id="copy" onclick="cxcommand(event)"><a href="#" target="_self">Copy</a></li>
<li id="paste" onclick="cxcommand(event)"><a href="#" target="_self">Paste</a></li>
<li id="delete" onclick="cxcommand(event)"><a href="#" target="_self">Delete</a></li>
<li id="color" class="hasSubMenu"><a href="#" target="_self">Color</a>
<ul class="subMenu" id="colorSubMenu">
<li style="background: crimson;" onclick="cxcommand(event, 'color')"><a href="#" target="_self">Red</a></li>
<li style="background: chartreuse;" onclick="cxcommand(event, 'color')"><a href="#" target="_self">Green</a></li>
<li style="background: aquamarine;" onclick="cxcommand(event, 'color')"><a href="#" target="_self">Blue</a></li>
<li style="background: gold;" onclick="cxcommand(event, 'color')"><a href="#" target="_self">Yellow</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="description">
<p>This demonstrates the implementation of a custom HTML context menu.</p>
<p>For a light-box style HTML context menu implementation, see the <a href="htmlLightBoxContextMenu.html">LightBox Context Menu</a> sample.</p>
<p>Right-click or tap-hold on a Node to bring up a context menu.
If you have a selection copied in the clipboard, you can bring up a context menu anywhere to paste.</p>
</div>
</div>
</div>
</body>
</html>