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javascript - 如何使用 Node 和 Electron 动态更改 CSS 样式属性

问题描述

我遇到了以下问题：我想访问styles.cssElectron 内部的 css 属性。问题是我无法使用document.getElementsByClassName()，因为documentNode 中没有。q所需的行为是在按下键后更改一个 div 的颜色。这是我的代码：

index.js

const url = require('url');
const path = require('path');

const {app, BrowserWindow, globalShortcut} = require('electron');
let mainWindow;

app.on('ready', function(){
    // Create new window
    mainWindow = new BrowserWindow({backgroundColor: '#000000', fullscreen : true, frame : false});
    // Load html in window
    mainWindow.loadURL(url.format({
      pathname: path.join(__dirname, 'index.html'),
      protocol: 'file:',
      slashes:true
    }))
    globalShortcut.register('Esc', () => {
        app.quit();
    });
    globalShortcut.register('q', () => {
      leftLight();
  });

});


//This doesn't work
function leftLight() {
  var element =   ;
  element.style["background-color"] = "yellow";
}

index.html

<!DOCTYPE html>
<html lang="en">
<meta name="viewport" content="width=device-width, initial-scale=1">

<head>
    <link rel="stylesheet" href="styles.css">
    <title>Document</title>
</head>
<body>
    <div class = rect_green> <h2 class=blocktext >LEFT FENCER</h2></div>
    <div class = rect_red><h2 class=blocktext> RIGHT FENCER</h2> </div>
    <div class = crono> <h2 class=blocktext>3:00</h2></div>
</body>
</html>

styles.css

.rect_green {
  display: flex;
  align-items: center;
  height: 400px;
  width:60%;
  background-color: green;
  position:relative;
  top:100px;
  text-align: center;

}

.rect_red {
  display: flex;
  align-items: center;
  height:400px;
  width:60%;
  background-color: red;
  position:relative;
  top:120px;
  float:right;
}

.crono {
  display: flex;
  align-items: center;
  height:300px;
  width:40%;
  background-color: beige;
  position:fixed;
  left: 50%;
  bottom : 50px;
  transform: translate(-50%, 0px);
  margin: 0 auto;
}

.blocktext {
  margin-left: auto;
  margin-right: auto;
  font-family: "Palatino", Times, serif;
  font-size: 180px;
}

编辑

在 Gr8Miller 建议的修改之后（仍然没有通信）： index.html

<!DOCTYPE html>
<html lang="en">
<meta name="viewport" content="width=device-width, initial-scale=1">

<head>
    <link rel="stylesheet" href="styles.css">
    <title>Document</title>
</head>
<body>
    <div class = rect_green> <h2 class=blocktext >LEFT FENCER</h2></div>
    <div class = rect_red><h2 class=blocktext> RIGHT FENCER</h2> </div>
    <div class = crono> <h2 class=blocktext>3:00</h2></div>
</body>

<script type="text/javascript">
        var ipc = require('electron').ipcRenderer;
        ipc.on('key-pressed-q', (e) => {
            //var element =  document.getElementsByClassName("rect_green");
            //element.style["background-color"] = "yellow";
            console.log("q pressed in html file");    
        });
    </script>

</html>

和index.js

const url = require('url');
const path = require('path');

const {app, BrowserWindow, globalShortcut, ipcMain, webContents} = require('electron');
let mainWindow;

app.on('ready', function(){
    // Create new window
    mainWindow = new BrowserWindow({
      backgroundColor: '#000000',
      fullscreen : true, 
      frame : false,
      icon : __dirname + "/res/icon.jpg",
      webPreferences: {
        nodeIntegration : true
      }
    });
    // Load html in window
    mainWindow.loadURL(url.format({
      pathname: path.join(__dirname, 'index.html'),
      protocol: 'file:',
      slashes:true
    }))
    globalShortcut.register('Esc', () => {
        app.quit();
    });
    globalShortcut.register('q', () => {
      leftLight();

  });

});

function leftLight() {
  mainWindow && mainWindow.webContents.send('key-pressed-q');
  console.log("Sending q pressed to html...");
}

标签： javascriptcssnode.jselectron

解决方案

可能与此重复。

尝试创建另一个包含您的代码的 js 文件并将其作为脚本从您的 html 文档加载。

将此添加到您的 index.html：

<script type="text/javascript" charset="utf8" src="./pageScript.js"></script>

并使用您想要的代码创建一个单独的 pageScript.js 文件：

window.onload = function () {
    // your code here
    function leftLight() {
        var element = ;
        element.style["background-color"] = "yellow";
    }

    // Also don't forget to call the function
    leftLight();
}

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