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Add layer

Add a new PDF Layer in Node.js

To add a PDF layer or OCG (optional content group) to a new document.

let doc = await PDFNet.PDFDoc.create();
const builder = await PDFNet.ElementBuilder.create();
const writer = await PDFNet.ElementWriter.create();

// Create a layer
const imageLayer = await PDFNet.OCG.create(doc, 'Image Layer');
const cfg = await PDFNet.OCGConfig.create(doc, true);

// Add the new OCG to the list of layers that should appear in PDF viewer GUI.
let layerOrderArray = await doc.createIndirectArray();
layerOrderArray.pushBack(await image_layer.getSDFObj());

// Start a new page
const page = await doc.pageCreate();
writer.beginOnPage(page); // Begin writing to the page

// Add new content to the page and associate it with one of the layers.
const nullEncoderHints = new PDFNet.Obj('0');
const img = await PDFNet.Image.createFromURL(doc, imagename, nullEncoderHints);
const img_obj = await img.getSDFObj();
img_obj.put('OC', imageLayer);
writer.writePlacedElement(await builder.createImageScaled(img, 300, 600, 200, -150));
await writer.end();   // save changes to the current page

PDF layers (OCG)
Full sample code which demonstrates how to create, extract, render PDF layers.

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