electron-文件處理的應用

時間 2019-11-13

標籤 electron 文件處理應用简体版

原文原文鏈接

文件管理是桌面應用很是重要的功能，幾乎全部的應用都會涉及到文件的內容。javascript

安裝依賴的庫css

npm install -g bowerhtml

**提示：**bower也是一個包管理，經過這個庫你能夠安裝全部js和css的庫。java

安裝boostrapjquery

bower install bootstrapnpm

安裝jquerybootstrap

npm install --save jqueryapp

該章的內容是建立一個表單，輸入相應的名字和Email,系統會將其保存在一個.txt文件當中，當你再次打開的時候會自動從該文件讀取相應的內容。electron

咱們須要建立一個main.js文件，而且輸入下面所示的代碼。函數

const {
    app,
    BrowserWindow
} = require('electron')
const url = require('url')
const path = require('path')
let win

function createWindow() {
    win = new BrowserWindow({
        width: 800,
        height: 600
    })
    win.loadURL(url.format({
        pathname: path.join(__dirname, 'index.html'),
        protocol: 'file',
        slashes: true
    }))
}
app.on('ready', createWindow)

一樣的咱們須要建立一個index.html，用來建立顯示的內容。

<!DOCTYPE html>
<html>
   <head>
      <meta charset = "UTF-8">
      <title>File System</title>
      <link rel = "stylesheet" 
         href = "./bower_components/bootstrap/dist/css/bootstrap.min.css" />
      
      <style type = "text/css">
         #contact-list {
            height: 150px;
            overflow-y: auto;
         }
      </style>
   </head>
   
   <body>
      <div class = "container">
         <h1>Enter Names and Email addresses of your contacts</h1>
         <div class = "form-group">
            <label for = "Name">Name</label>
            <input type = "text" name = "Name" value = "" id = "Name" 
               placeholder = "Name" class = "form-control" required>
         </div>
         
         <div class = "form-group">
            <label for = "Email">Email</label>
            <input type = "email" name = "Email" value = "" id = "Email" 
               placeholder = "Email" class = "form-control" required>
         </div>
         
         <div class = "form-group">
            <button class = "btn btn-primary" id = "add-to-list">Add to list!</button>
         </div>
         
         <div id = "contact-list">
            <table class = "table-striped" id = "contact-table">
               <tr>
                  <th class = "col-xs-2">S. No.</th>
                  <th class = "col-xs-4">Name</th>
                  <th class = "col-xs-6">Email</th>
               </tr>
            </table>
         </div>
         
         <script src = "./view.js" ></script>
      </div>
   </body>
</html>

如今咱們建立一個view.js文件。

咱們建立一個函數loadAndDisplayContacts()，該函數在初始加載時會讀取文件而且追加到列表當中，同時建立了一個單擊事件，將當前的信息添加到列表當中。

let $ = require('jquery')
let fs = require('fs')
let filename = 'contacts'
let sno = 0

$('#add-to-list').on('click', () => {
   let name = $('#Name').val()
   let email = $('#Email').val()

   fs.appendFile('contacts', name + ',' + email + '\n')

   addEntry(name, email)
})

function addEntry(name, email) {
   if(name && email) {
      sno++
      let updateString = '<tr><td>'+ sno + '</td><td>'+ name +'</td><td>' 
         + email +'</td></tr>'
      $('#contact-table').append(updateString)
   }
}

function loadAndDisplayContacts() {  
   
   //Check if file exists
   if(fs.existsSync(filename)) {
      let data = fs.readFileSync(filename, 'utf8').split('\n')
      
      data.forEach((contact, index) => {
         let [ name, email ] = contact.split(',')
         addEntry(name, email)
      })
   
   } else {
      console.log("File Doesn\'t Exist. Creating new file.")
      fs.writeFile(filename, '', (err) => {
         if(err)
            console.log(err)
      })
   }
}

loadAndDisplayContacts()

最終顯示的效果

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