Add a Multiline Watermark to PDF document in Node.js

[aqpeeb]

Is there a way to apply a watermark (text stamp) to all pages in a document with one api call?

I am using the nodejs sdk “asposepdfcloud” and I want to add a multiline watermark. How can I do that? I am currently doing this:

const textState = new TextState();
textState.fontSize = 48;
textState.font = ‘Arial’;

const stamp = new TextStamp();
stamp.background = true;
stamp.leftMargin = 1;
stamp.rightMargin = 2;
stamp.topMargin = 3;
stamp.bottomMargin = 4;
stamp.horizontalAlignment = HorizontalAlignment.Center;
stamp.verticalAlignment = VerticalAlignment.Center;
stamp.opacity = 0.3;
stamp.rotate = Rotation.on270;
stamp.rotateAngle = 45;
stamp.xIndent = 0;
stamp.yIndent = 0;
stamp.zoom = 1;
stamp.textAlignment = HorizontalAlignment.Center;
stamp.value = text;
stamp.textState = textState;

But stamp.value does not do anything interesting with \n\r I still get one line.

[tilal.ahmad]

@aqpeeb

@aqpeeb

Is there a way to apply a watermark (text stamp) to all pages in a document with one api call?

You can use PostDocumentTextHeader API method to add text to all pages of the PDF document. Please check the sample Node.js code for reference.

async function test(){
const { PdfApi } = require("asposepdfcloud");
const { TextHeader }= require("asposepdfcloud/src/models/textHeader");
const { TextState }= require("asposepdfcloud/src/models/textState");
const { HorizontalAlignment }= require("asposepdfcloud/src/models/horizontalAlignment");
const { Color }= require("asposepdfcloud/src/models/Color");
const { Rotation }= require("asposepdfcloud/src/models/rotation");
const { FontStyles }= require("asposepdfcloud/src/models/fontStyles");


// Get App Key and App SID from https://dashboard.aspose.cloud/
pdfApi = new PdfApi("xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxx", "xxxxxxxxxxxxxxxxxx");


const color = new Color();
color.a = 1;
color.r = 0;
color.g = 0;
color.b = 0;

const textState = new TextState();
textState.fontSize = 36;
textState.font = "Arial";
textState.foregroundColor = color;
textState.fontStyle = FontStyles.Regular;

const textHeader = new TextHeader();
textHeader.background = true;
textHeader.horizontalAlignment = HorizontalAlignment.Center;
textHeader.textAlignment = HorizontalAlignment.Center;
textHeader.topMargin = 250;
textHeader.opacity = 0.5,
textHeader.zoom = 1;
textHeader.rotate = Rotation.on90;
textHeader.rotateAngle = 45;
textHeader.value = "test aspose cloud";
textHeader.textState = textState;

const processWatermark = new Promise((resolve, reject) => {
let name = "4pages.pdf";


pdfApi.postDocumentTextHeader(name, textHeader, null, null, null, null)
    .then((result) => resolve(true))
    .catch((err) => resolve(true));
})
console.log(await processWatermark);
}

test();

@aqpeeb

But stamp.value does not do anything interesting with \n\r I still get one line.

I am afraid you can not add a multiline text stamp. However, you can add text twice to different positions.