106 lines
3.6 KiB
HTML
106 lines
3.6 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Minimal Image Blob and Download</title>
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<meta name="description" content="Minimal, showing image Blob creation and download with Diagram.makeImageData." />
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<!-- Copyright 1998-2017 by Northwoods Software Corporation. -->
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<meta charset="UTF-8">
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<script src="../release/go.js"></script>
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<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
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<script id="code">
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function init() {
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if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
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var $ = go.GraphObject.make; // for conciseness in defining templates
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myDiagram = $(go.Diagram, "myDiagramDiv", // create a Diagram for the DIV HTML element
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{
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initialContentAlignment: go.Spot.Center, // center the content
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"undoManager.isEnabled": true // enable undo & redo
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});
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// define a simple Node template
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myDiagram.nodeTemplate =
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$(go.Node, "Auto", // the Shape will go around the TextBlock
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$(go.Shape, "RoundedRectangle", { strokeWidth: 0},
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// Shape.fill is bound to Node.data.color
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new go.Binding("fill", "color")),
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$(go.TextBlock,
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{ margin: 8 }, // some room around the text
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// TextBlock.text is bound to Node.data.key
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new go.Binding("text", "key"))
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);
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// but use the default Link template, by not setting Diagram.linkTemplate
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// create the model data that will be represented by Nodes and Links
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myDiagram.model = new go.GraphLinksModel(
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[
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{ key: "Alpha", color: "lightblue" },
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{ key: "Beta", color: "orange" },
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{ key: "Gamma", color: "lightgreen" },
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{ key: "Delta", color: "pink" }
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],
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[
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{ from: "Alpha", to: "Beta" },
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{ from: "Alpha", to: "Gamma" },
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{ from: "Beta", to: "Beta" },
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{ from: "Gamma", to: "Delta" },
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{ from: "Delta", to: "Alpha" }
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]);
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document.getElementById("blobButton").addEventListener("click", makeBlob);
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}
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// When the blob is complete, make an anchor tag for it and use the tag to initiate a download
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// Works in:
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// * Chrome
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// * IE11, Edge
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// * Firefox
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function myCallback(blob) {
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var url = window.URL.createObjectURL(blob);
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var filename = "myBlobFile.png";
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var a = document.createElement("a");
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a.style = "display: none";
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a.href = url;
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a.download = filename;
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// IE 11
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if (window.navigator.msSaveBlob !== undefined) {
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window.navigator.msSaveBlob(blob, filename);
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return;
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}
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document.body.appendChild(a);
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requestAnimationFrame(function() {
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a.click();
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window.URL.revokeObjectURL(url);
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document.body.removeChild(a);
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});
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}
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function makeBlob() {
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var blob = myDiagram.makeImageData( { background: "white", returnType: "blob", callback: myCallback });
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}
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</script>
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</head>
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<body onload="init()">
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<div id="sample">
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<!-- The DIV for the Diagram needs an explicit size or else we won't see anything.
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This also adds a border to help see the edges of the viewport. -->
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<div id="myDiagramDiv" style="border: solid 1px black; width:400px; height:400px"></div>
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<button id="blobButton">Make Blob and Download</button>
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<p>
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This sample shows how to use <a>Diagram.makeImageData</a> with the <code>returnType: "blob"</code> option
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and the necessary <code>callback</code> option.
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</p>
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<p>
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Blobs may not be supported or work consistently on all browsers.
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This code was tested with Chrome, Firefox, IE11 and Edge.
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</p>
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</div>
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</body>
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</html>
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