前言
这里学完了基本就告一段落了,文件操作按照原生来说，是需要一定权限的，这里就直接在root目录进行操作，存储位置位于内置app包名目录下。
这里代码已经写好了，今天要转java去写后台了，估计没时间写文档了，直接贴代码吧
构建
- 安装插件
cordova plugin add cordova-plugin-file
HTML代码
<!doctype html>
<html>
<head>
<meta http-equiv="Content-Security-Policy" content="default-src 'self' data: gap: https://ssl.gstatic.com 'unsafe-eval'; style-src 'self' 'unsafe-inline'; media-src *; img-src 'self' data: content:;">
<meta name="format-detection" content="telephone=no">
<meta charset="utf-8" />
<meta name="msapplication-tap-highlight" content="no">
<meta name="viewport" content="user-scalable=no, initial-scale=1, maximum-scale=1, minimum-scale=1, width=device-width">
<link rel="stylesheet" type="text/css" href="css/index.css">
</head>
<body>
<div class="app">
<h1>文件操作</h1>
<div id="deviceready" class="blink">
<p class="event listening">Connecting to Device</p>
<p class="event received">Device is Ready</p>
</div>
<button id = "createFile">建</button>
<button id = "writeFile">写</button>
<button id = "readFile">读</button>
<button id = "removeFile">删</button>
<button id="nextPage">NEXT PAGE</button>
<textarea id = "textarea"></textarea>
</div>
<script type="text/javascript" src="cordova.js"></script>
<script type="text/javascript" src="js/file_manager.js"></script>
<script type="text/javascript" src="js/jquery-3.1.1.min.js"></script>
</body>
</html>
JS代码
var app = {
initialize: function () {
document.addEventListener('deviceready', this.onDeviceReady.bind(this), false);
},
// deviceready Event Handler
//
// Bind any cordova events here. Common events are:
// 'pause', 'resume', etc.
onDeviceReady: function () {
var datas=null;
var filePath = "";
var fileName = "";
this.receivedEvent('deviceready');
document.getElementById("createFile").addEventListener("click", createFile);
document.getElementById("writeFile").addEventListener("click", writeFile);
document.getElementById("readFile").addEventListener("click", readFile);
document.getElementById("removeFile").addEventListener("click", removeFile);
document.getElementById("nextPage").addEventListener("click", nextPage);
function createFile() {
//设置类型 [TEMPORARY , PERSISTENT]
var type = window.TEMPORARY;
//设置大小
var size = 5 * 1024 * 1024;
//请求文件系统 ,参数直接看下面
window.requestFileSystem(type, size, successCallback, errorCallback)
//创建一个hello.txt文件,存到到根目录
function successCallback(fs) {
fs.root.getFile('hello.txt', {create: true, exclusive: true}, function (fileEntry) {
console.log('successfull!')
}, errorCallback);
}
function errorCallback(error) {
alert("未创建成功:" + error)
}
}
function writeFile() {
var type = window.TEMPORARY;
var size = 5 * 1024 * 1024;
window.requestFileSystem(type, size, successCallback, errorCallback)
function successCallback(fs) {
fs.root.getFile('hello.txt', {create: true}, function (fileEntry) {
//在本FileEntry中创建一个和文件关联的FileWriter方法
fileEntry.createWriter(function (fileWriter) {
fileWriter.onwriteend = function (e) {
alert("写入成功！");
};
fileWriter.onerror = function (e) {
alert("写入失败：" + e.toString());
};
//获取文本框中的值
var blob = new Blob([$(document).ready(function () {
$("#textarea").val();
})], {type: 'text/plain'});
//想文件中写数据
fileWriter.write(blob);
}, errorCallback);
}, errorCallback);
}
function errorCallback(error) {
alert("ERROR: " + error.code)
}
}
function readFile() {
var type = window.TEMPORARY;
var size = 5 * 1024 * 1024;
window.requestFileSystem(type, size, successCallback, errorCallback)
function successCallback(fs) {
fs.root.getFile('hello.txt', {}, function (fileEntry) {
fileEntry.file(function (file) {
//创建文件输入流
var reader = new FileReader();
//读完数据赋值给文本域
reader.onloadend = function (e) {
var txtArea = document.getElementById('textarea');
txtArea.value = this.result;
};
//从关联文件中读数据
reader.readAsText(file);
}, errorCallback);
}, errorCallback);
}
function errorCallback(error) {
alert("ERROR: " + error.code)
}
}
function removeFile() {
var type = window.TEMPORARY;
var size = 5 * 1024 * 1024;
window.requestFileSystem(type, size, successCallback, errorCallback)
function successCallback(fs) {
fs.root.getFile('hello.txt', {create: false}, function (fileEntry) {
fileEntry.remove(function () {
alert('File removed.');
}, errorCallback);
}, errorCallback);
}
function errorCallback(error) {
alert("ERROR: " + error.code)
}
}
function nextPage() {
location.href = "callActivity.html";
}
},
// Update DOM on a Received Event
receivedEvent: function (id) {
var parentElement = document.getElementById(id);
var listeningElement = parentElement.querySelector('.listening');
var receivedElement = parentElement.querySelector('.received');
listeningElement.setAttribute('style', 'display:none;');
receivedElement.setAttribute('style', 'display:block;');
console.log('Received Event: ' + id);
}
};
app.initialize();
JS代码的另一种简单模式，点击下一页之后的js代码
// Wait for device API libraries to load
//
function onLoad() {
document.addEventListener("deviceready", onDeviceReady, false);
}
// device APIs are available
//
function onDeviceReady() {
// Now safe to use device APIs
alert("设备准备就绪，给你看个空页面！");
}
