How to print a DIV in ElectronJS
i'm trying to convert my web into an app made in ElectronJS
in my web i print a div with a barcode. this works pretty fine, but in electronjs i can't reach this.
originally i'd use this function
$scope.printDiv = function (divName) {
var printContents = document.getElementById(divName).innerHTML;
var popupWin = window.open('', '_blank', 'width=500,height=500');
popupWin.document.open();
popupWin.document.write('<html><head><link rel="stylesheet" type="text/css" href="styles/main.css" type=\"text/css\" media=\"print\" /></head><body onload="window.print()">' + printContents + '</body></html>');
popupWin.document.close();
}
with electronjs
i don't know how to pass the object to print.
also i'm trying to generate a PDF from content that i can load. but the PDF's are corrupted
var windowPrint = require('electron').remote.BrowserWindow;
var fs = require('fs');
var newWindow = new windowPrint({width: 800, height: 600, show: false});
console.log(newWindow);
newWindow.loadURL('http://github.com');
newWindow.show();
newWindow.webContents.print({silent: true, printBackground: true});
newWindow.webContents.printToPDF({printSelectionOnly : true, printBackground: true}, function (error, data) {
if (error) {
throw error;
}
console.log(error);
console.log(data);
fs.writeFile('print.pdf', function (data, error) {
if (error) {
throw error;
}
console.log(error);
console.log(data);
});
});
there's a simple way to print a DIV with electronjs?
thank you for reading.
Answer
You have printed this page before loading is finished.
My approach: 1. create a mainwindow and a (invisible) worker window
import {app, BrowserWindow, Menu, ipcMain, shell} from "electron";
const os = require("os");
const fs = require("fs");
const path = require("path");
let mainWindow: Electron.BrowserWindow = undefined;
let workerWindow: Electron.BrowserWindow = undefined;
async function createWindow() {
mainWindow = new BrowserWindow();
mainWindow.loadURL("file://" + __dirname + "/index.html");
mainWindow.webContents.openDevTools();
mainWindow.on("closed", () => {
// close worker windows later
mainWindow = undefined;
});
workerWindow = new BrowserWindow();
workerWindow.loadURL("file://" + __dirname + "/worker.html");
// workerWindow.hide();
workerWindow.webContents.openDevTools();
workerWindow.on("closed", () => {
workerWindow = undefined;
});
}
// retransmit it to workerWindow
ipcMain.on("printPDF", (event: any, content: any) => {
console.log(content);
workerWindow.webContents.send("printPDF", content);
});
// when worker window is ready
ipcMain.on("readyToPrintPDF", (event) => {
const pdfPath = path.join(os.tmpdir(), 'print.pdf');
// Use default printing options
workerWindow.webContents.printToPDF({}).then((data) {
fs.writeFile(pdfPath, data, function (error) {
if (error) {
throw error
}
shell.openItem(pdfPath)
event.sender.send('wrote-pdf', pdfPath)
})
}).catch((error) => {
throw error;
})
});
2, mainWindow.html
<head>
</head>
<body>
<button id="btn"> Save </button>
<script>
const ipcRenderer = require("electron").ipcRenderer;
// cannot send message to other windows directly https://github.com/electron/electron/issues/991
function sendCommandToWorker(content) {
ipcRenderer.send("printPDF", content);
}
document.getElementById("btn").addEventListener("click", () => {
// send whatever you like
sendCommandToWorker("<h1> hello </h1>");
});
</script>
</body>
3, worker.html
<head> </head>
<body>
<script>
const ipcRenderer = require("electron").ipcRenderer;
ipcRenderer.on("printPDF", (event, content) => {
document.body.innerHTML = content;
ipcRenderer.send("readyToPrintPDF");
});
</script>
</body>