Question

我试图将我的网络转换为使用ElectronJS制作的应用

在我的网页上我打印带有条形码的div。这很好用，但在电子设备中我无法达到这个目的。

最初我使用此功能

$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

我不知道如何传递对象进行打印。

我也试图从我可以加载的内容生成PDF。但PDF已损坏

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);
        });
    });

有一种使用electronjs打印DIV的简单方法吗？

谢谢你的阅读。

Answer 1

您已在加载完成前打印此页面。

我的方法： 1.创建一个主窗口和一个（不可见的）工作窗口

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({}, function (error, data) {
        if (error) throw error
        fs.writeFile(pdfPath, data, function (error) {
            if (error) {
                throw error
            }
            shell.openItem(pdfPath)
            event.sender.send('wrote-pdf', pdfPath)
        })
    })
});

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>

Answer 2

谢谢你，也可以用print（）打印

ipcMain.on('print', (event, content) => {
    workerWindow.webContents.send('print', content);
});

ipcMain.on('readyToPrint', (event) => {
    workerWindow.webContents.print({});
});

（相应地重命名事件）

Answer 3

这可能有点晚了，但对于其他想要在电子中打印 div 的人，我建议您使用范围对象选择您的 div，然后使用主进程打印 pdf，并将 printSelectionOnly 设为 true。

渲染器进程中的JS：

function printDivToPDF(id) {
    let element = document.getElementById(id);
    let range = new Range();
    range.setStart(element, 0);
    range.setEndAfter(element, 0);
    document.getSelection().removeAllRanges();
    document.getSelection().addRange(range);
    ipcRenderer.send('exportSelectionToPDF');
}

主进程中的js：

ipcMain.on('exportSelectionToPDF', (event) => {
    let window = BrowserWindow.fromWebContents(e.sender);
    window.webContents.printToPDF({ printSelectionOnly: true, }).then((data) => {
        // Use the data however you like :)
    });
});

如何在ElectronJS中打印DIV

3 个答案: