Related
I tried to open file with
window.open("file:///D:/Hello.txt");
The browser does not allow opening a local file this way, probably for security reasons. I want to use the file's data in the client side. How can I read local file in JavaScript?
Here's an example using FileReader:
function readSingleFile(e) {
var file = e.target.files[0];
if (!file) {
return;
}
var reader = new FileReader();
reader.onload = function(e) {
var contents = e.target.result;
displayContents(contents);
};
reader.readAsText(file);
}
function displayContents(contents) {
var element = document.getElementById('file-content');
element.textContent = contents;
}
document.getElementById('file-input')
.addEventListener('change', readSingleFile, false);
<input type="file" id="file-input" />
<h3>Contents of the file:</h3>
<pre id="file-content"></pre>
Specs
http://dev.w3.org/2006/webapi/FileAPI/
Browser compatibility
IE 10+
Firefox 3.6+
Chrome 13+
Safari 6.1+
http://caniuse.com/#feat=fileapi
The HTML5 fileReader facility does allow you to process local files, but these MUST be selected by the user, you cannot go rooting about the users disk looking for files.
I currently use this with development versions of Chrome (6.x). I don't know what other browsers support it.
Because I have no life and I want those 4 reputation points so I can show my love to (upvote answers by) people who are actually good at coding I've shared my adaptation of Paolo Moretti's code. Just use openFile(function to be executed with file contents as first parameter).
function dispFile(contents) {
document.getElementById('contents').innerHTML=contents
}
function clickElem(elem) {
// Thx user1601638 on Stack Overflow (6/6/2018 - https://stackoverflow.com/questions/13405129/javascript-create-and-save-file )
var eventMouse = document.createEvent("MouseEvents")
eventMouse.initMouseEvent("click", true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null)
elem.dispatchEvent(eventMouse)
}
function openFile(func) {
readFile = function(e) {
var file = e.target.files[0];
if (!file) {
return;
}
var reader = new FileReader();
reader.onload = function(e) {
var contents = e.target.result;
fileInput.func(contents)
document.body.removeChild(fileInput)
}
reader.readAsText(file)
}
fileInput = document.createElement("input")
fileInput.type='file'
fileInput.style.display='none'
fileInput.onchange=readFile
fileInput.func=func
document.body.appendChild(fileInput)
clickElem(fileInput)
}
Click the button then choose a file to see its contents displayed below.
<button onclick="openFile(dispFile)">Open a file</button>
<pre id="contents"></pre>
Try
function readFile(file) {
return new Promise((resolve, reject) => {
let fr = new FileReader();
fr.onload = x=> resolve(fr.result);
fr.readAsText(file);
})}
but user need to take action to choose file
function readFile(file) {
return new Promise((resolve, reject) => {
let fr = new FileReader();
fr.onload = x=> resolve(fr.result);
fr.readAsText(file);
})}
async function read(input) {
msg.innerText = await readFile(input.files[0]);
}
<input type="file" onchange="read(this)"/>
<h3>Content:</h3><pre id="msg"></pre>
Others here have given quite elaborate code for this. Perhaps more elaborate code was needed at that time, I don't know. Anyway, I upvoted one of them, but here is a very much simplified version that works the same:
function openFile() {
document.getElementById('inp').click();
}
function readFile(e) {
var file = e.target.files[0];
if (!file) return;
var reader = new FileReader();
reader.onload = function(e) {
document.getElementById('contents').innerHTML = e.target.result;
}
reader.readAsText(file)
}
Click the button then choose a file to see its contents displayed below.
<button onclick="openFile()">Open a file</button>
<input id="inp" type='file' style="visibility:hidden;" onchange="readFile(event)" />
<pre id="contents"></pre>
Consider reformatting your file into javascript.
Then you can simply load it using good old...
<script src="thefileIwantToLoad.js" defer></script>
Here is how to do it in typescript if Blob is good enough (no need to convert to ByteArray/String via FileReader for many use-cases)
function readFile({
fileInput,
}: {
fileInput: HTMLInputElement;
}): Promise<ArrayLike<Blob>> {
return new Promise((resolve, reject) => {
fileInput.addEventListener("change", () => {
resolve(fileInput.files);
});
});
}
here is how to do it in vanilla javascript
function readFile({
fileInput,
}) {
return new Promise((resolve, reject) => {
fileInput.addEventListener("change", () => {
resolve(fileInput.files);
});
});
}
It is not related to "security reasons" . And it does not matter if it local or file on network drive.
The solution for Windows OS could be IIS - Internet Information Services
and this is some details :
To open file in browser with Java Script window.open() , the file should be available on WEB server.
By creating Virtual Directory on your IIS that mapped to any physical drive you should be able to open files.
The virtual directory will have some http: address.
So instead of window.open("file:///D:/Hello.txt");
You will write window.open("http://iis-server/MY_VIRTUAL_DRIVE_D/Hello.txt");
The xmlhttp request method is not valid for the files on local disk because the browser security does not allow us to do so.But we can override the browser security by creating a shortcut->right click->properties In target "... browser location path.exe" append --allow-file-access-from-files.This is tested on chrome,however care should be taken that all browser windows should be closed and the code should be run from the browser opened via this shortcut.
You can't. New browsers like Firefox, Safari etc. block the 'file' protocol. It will only work on old browsers.
You'll have to upload the files you want.
Javascript cannot typically access local files in new browsers but the XMLHttpRequest object can be used to read files. So it is actually Ajax (and not Javascript) which is reading the file.
If you want to read the file abc.txt, you can write the code as:
var txt = '';
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function(){
if(xmlhttp.status == 200 && xmlhttp.readyState == 4){
txt = xmlhttp.responseText;
}
};
xmlhttp.open("GET","abc.txt",true);
xmlhttp.send();
Now txt contains the contents of the file abc.txt.
I tried to open file with
window.open("file:///D:/Hello.txt");
The browser does not allow opening a local file this way, probably for security reasons. I want to use the file's data in the client side. How can I read local file in JavaScript?
Here's an example using FileReader:
function readSingleFile(e) {
var file = e.target.files[0];
if (!file) {
return;
}
var reader = new FileReader();
reader.onload = function(e) {
var contents = e.target.result;
displayContents(contents);
};
reader.readAsText(file);
}
function displayContents(contents) {
var element = document.getElementById('file-content');
element.textContent = contents;
}
document.getElementById('file-input')
.addEventListener('change', readSingleFile, false);
<input type="file" id="file-input" />
<h3>Contents of the file:</h3>
<pre id="file-content"></pre>
Specs
http://dev.w3.org/2006/webapi/FileAPI/
Browser compatibility
IE 10+
Firefox 3.6+
Chrome 13+
Safari 6.1+
http://caniuse.com/#feat=fileapi
The HTML5 fileReader facility does allow you to process local files, but these MUST be selected by the user, you cannot go rooting about the users disk looking for files.
I currently use this with development versions of Chrome (6.x). I don't know what other browsers support it.
Because I have no life and I want those 4 reputation points so I can show my love to (upvote answers by) people who are actually good at coding I've shared my adaptation of Paolo Moretti's code. Just use openFile(function to be executed with file contents as first parameter).
function dispFile(contents) {
document.getElementById('contents').innerHTML=contents
}
function clickElem(elem) {
// Thx user1601638 on Stack Overflow (6/6/2018 - https://stackoverflow.com/questions/13405129/javascript-create-and-save-file )
var eventMouse = document.createEvent("MouseEvents")
eventMouse.initMouseEvent("click", true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null)
elem.dispatchEvent(eventMouse)
}
function openFile(func) {
readFile = function(e) {
var file = e.target.files[0];
if (!file) {
return;
}
var reader = new FileReader();
reader.onload = function(e) {
var contents = e.target.result;
fileInput.func(contents)
document.body.removeChild(fileInput)
}
reader.readAsText(file)
}
fileInput = document.createElement("input")
fileInput.type='file'
fileInput.style.display='none'
fileInput.onchange=readFile
fileInput.func=func
document.body.appendChild(fileInput)
clickElem(fileInput)
}
Click the button then choose a file to see its contents displayed below.
<button onclick="openFile(dispFile)">Open a file</button>
<pre id="contents"></pre>
Try
function readFile(file) {
return new Promise((resolve, reject) => {
let fr = new FileReader();
fr.onload = x=> resolve(fr.result);
fr.readAsText(file);
})}
but user need to take action to choose file
function readFile(file) {
return new Promise((resolve, reject) => {
let fr = new FileReader();
fr.onload = x=> resolve(fr.result);
fr.readAsText(file);
})}
async function read(input) {
msg.innerText = await readFile(input.files[0]);
}
<input type="file" onchange="read(this)"/>
<h3>Content:</h3><pre id="msg"></pre>
Others here have given quite elaborate code for this. Perhaps more elaborate code was needed at that time, I don't know. Anyway, I upvoted one of them, but here is a very much simplified version that works the same:
function openFile() {
document.getElementById('inp').click();
}
function readFile(e) {
var file = e.target.files[0];
if (!file) return;
var reader = new FileReader();
reader.onload = function(e) {
document.getElementById('contents').innerHTML = e.target.result;
}
reader.readAsText(file)
}
Click the button then choose a file to see its contents displayed below.
<button onclick="openFile()">Open a file</button>
<input id="inp" type='file' style="visibility:hidden;" onchange="readFile(event)" />
<pre id="contents"></pre>
Consider reformatting your file into javascript.
Then you can simply load it using good old...
<script src="thefileIwantToLoad.js" defer></script>
Here is how to do it in typescript if Blob is good enough (no need to convert to ByteArray/String via FileReader for many use-cases)
function readFile({
fileInput,
}: {
fileInput: HTMLInputElement;
}): Promise<ArrayLike<Blob>> {
return new Promise((resolve, reject) => {
fileInput.addEventListener("change", () => {
resolve(fileInput.files);
});
});
}
here is how to do it in vanilla javascript
function readFile({
fileInput,
}) {
return new Promise((resolve, reject) => {
fileInput.addEventListener("change", () => {
resolve(fileInput.files);
});
});
}
It is not related to "security reasons" . And it does not matter if it local or file on network drive.
The solution for Windows OS could be IIS - Internet Information Services
and this is some details :
To open file in browser with Java Script window.open() , the file should be available on WEB server.
By creating Virtual Directory on your IIS that mapped to any physical drive you should be able to open files.
The virtual directory will have some http: address.
So instead of window.open("file:///D:/Hello.txt");
You will write window.open("http://iis-server/MY_VIRTUAL_DRIVE_D/Hello.txt");
The xmlhttp request method is not valid for the files on local disk because the browser security does not allow us to do so.But we can override the browser security by creating a shortcut->right click->properties In target "... browser location path.exe" append --allow-file-access-from-files.This is tested on chrome,however care should be taken that all browser windows should be closed and the code should be run from the browser opened via this shortcut.
You can't. New browsers like Firefox, Safari etc. block the 'file' protocol. It will only work on old browsers.
You'll have to upload the files you want.
Javascript cannot typically access local files in new browsers but the XMLHttpRequest object can be used to read files. So it is actually Ajax (and not Javascript) which is reading the file.
If you want to read the file abc.txt, you can write the code as:
var txt = '';
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function(){
if(xmlhttp.status == 200 && xmlhttp.readyState == 4){
txt = xmlhttp.responseText;
}
};
xmlhttp.open("GET","abc.txt",true);
xmlhttp.send();
Now txt contains the contents of the file abc.txt.
EDIT : I just created a new Meteor Project and it worked :D wow.But it still doesnt work on my core project..looks like i have different settings.
In my Meteor.js project i have 4 .mp3-files located in public/sounds/xyz.mp3.
I load these .mp3 with :
let soundRequest = new XMLHttpRequest();
soundRequest.open('GET', this._soundPath, true);
soundRequest.responseType = 'arraybuffer';
let $this = this;
soundRequest.onload = function () {
Core.getAudioContext().decodeAudioData(soundRequest.response, function (buffer) {
$this.source.buffer = buffer;
$this.source.loop = true;
$this.source.connect($this.panner);
});
};
soundRequest.send();
This WORKS on google Chrome, but when i build the app via meteor run android-device, i get the following error message : DOMException: Unable to decode audio data
I wonder if this is a bug because loading .png or .jpg works just fine in the mobile version. I have not installed any packages beside meteor add crosswalk but deinstalling this doesnt help either.
You shouldn't need to do a http request to get a local resource. You can just refer to a local url. On the Android device the path is different. See this code:
function getSound(file) {
var sound = "/sounds/"+file;
if (Meteor.isCordova) {
var s;
if (device.platform.toLowerCase() === "android") {
sfile = cordova.file.applicationDirectory.replace('file://', '') + 'www/application/app' + sound;
}
else {
sfile = cordova.file.applicationDirectory.replace('file://', '') + sound;
}
var s = new Media(
sfile,
function (success) {
console.log("Got sound "+file+" ok ("+sfile+")");
s.play();
},
function (err) {
console.log("Get sound "+file+" ("+sfile+") failed: "+err);
}
);
} else {
var a = new Audio(sound);
a.play();
}
}
On a device it loads the sound file asynchronously and then plays it. In the browser it just loads and plays it synchronously.
This web API is not supported on android device but works on chrome browser of android
Check browser specification in this link
https://developer.mozilla.org/en-US/docs/Web/API/AudioContext/decodeAudioData
What is required to show an image from LocalStorage in HTML markup on PhoneGap running on Windows Phone 7?
an image is downloaded from the Internet and stored on the phone (on Windows Phone 7 it can be stored only in LocalStorege of the application's domain);
this image is to be shown using PhoneGap \ Cordova HTML markup with <img> element;
using <img src="xyz"/> ain't working;
The solution was quite different from Android version.
Following steps are necessary:
load the image from localstore as binary data;
place it in the "src" attribute of the img element encoded;
Code:
var fileName = 'myappname/test.png';
window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, onFileSystemSuccess, onFail);
function onFileSystemSuccess (fileSystem) {
fileSystem.root.getFile(fileName, null, gotFileEntry, onFail);
}
function gotFileEntry(fileEntry) {
fileEntry.file(onGotFile, onFail);
}
function gotFile(onGotFile) {
var reader = new FileReader();
reader.onloadend = function (evt) {
$('#outerDiv').html('<img src="' + evt.target.result + '" />');
};
reader.readAsDataURL(file);
}
function onFail(evt) {
console.log('error: ' + evt.target.error.code);
}
I tried to open file with
window.open("file:///D:/Hello.txt");
The browser does not allow opening a local file this way, probably for security reasons. I want to use the file's data in the client side. How can I read local file in JavaScript?
Here's an example using FileReader:
function readSingleFile(e) {
var file = e.target.files[0];
if (!file) {
return;
}
var reader = new FileReader();
reader.onload = function(e) {
var contents = e.target.result;
displayContents(contents);
};
reader.readAsText(file);
}
function displayContents(contents) {
var element = document.getElementById('file-content');
element.textContent = contents;
}
document.getElementById('file-input')
.addEventListener('change', readSingleFile, false);
<input type="file" id="file-input" />
<h3>Contents of the file:</h3>
<pre id="file-content"></pre>
Specs
http://dev.w3.org/2006/webapi/FileAPI/
Browser compatibility
IE 10+
Firefox 3.6+
Chrome 13+
Safari 6.1+
http://caniuse.com/#feat=fileapi
The HTML5 fileReader facility does allow you to process local files, but these MUST be selected by the user, you cannot go rooting about the users disk looking for files.
I currently use this with development versions of Chrome (6.x). I don't know what other browsers support it.
Because I have no life and I want those 4 reputation points so I can show my love to (upvote answers by) people who are actually good at coding I've shared my adaptation of Paolo Moretti's code. Just use openFile(function to be executed with file contents as first parameter).
function dispFile(contents) {
document.getElementById('contents').innerHTML=contents
}
function clickElem(elem) {
// Thx user1601638 on Stack Overflow (6/6/2018 - https://stackoverflow.com/questions/13405129/javascript-create-and-save-file )
var eventMouse = document.createEvent("MouseEvents")
eventMouse.initMouseEvent("click", true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null)
elem.dispatchEvent(eventMouse)
}
function openFile(func) {
readFile = function(e) {
var file = e.target.files[0];
if (!file) {
return;
}
var reader = new FileReader();
reader.onload = function(e) {
var contents = e.target.result;
fileInput.func(contents)
document.body.removeChild(fileInput)
}
reader.readAsText(file)
}
fileInput = document.createElement("input")
fileInput.type='file'
fileInput.style.display='none'
fileInput.onchange=readFile
fileInput.func=func
document.body.appendChild(fileInput)
clickElem(fileInput)
}
Click the button then choose a file to see its contents displayed below.
<button onclick="openFile(dispFile)">Open a file</button>
<pre id="contents"></pre>
Try
function readFile(file) {
return new Promise((resolve, reject) => {
let fr = new FileReader();
fr.onload = x=> resolve(fr.result);
fr.readAsText(file);
})}
but user need to take action to choose file
function readFile(file) {
return new Promise((resolve, reject) => {
let fr = new FileReader();
fr.onload = x=> resolve(fr.result);
fr.readAsText(file);
})}
async function read(input) {
msg.innerText = await readFile(input.files[0]);
}
<input type="file" onchange="read(this)"/>
<h3>Content:</h3><pre id="msg"></pre>
Others here have given quite elaborate code for this. Perhaps more elaborate code was needed at that time, I don't know. Anyway, I upvoted one of them, but here is a very much simplified version that works the same:
function openFile() {
document.getElementById('inp').click();
}
function readFile(e) {
var file = e.target.files[0];
if (!file) return;
var reader = new FileReader();
reader.onload = function(e) {
document.getElementById('contents').innerHTML = e.target.result;
}
reader.readAsText(file)
}
Click the button then choose a file to see its contents displayed below.
<button onclick="openFile()">Open a file</button>
<input id="inp" type='file' style="visibility:hidden;" onchange="readFile(event)" />
<pre id="contents"></pre>
Consider reformatting your file into javascript.
Then you can simply load it using good old...
<script src="thefileIwantToLoad.js" defer></script>
Here is how to do it in typescript if Blob is good enough (no need to convert to ByteArray/String via FileReader for many use-cases)
function readFile({
fileInput,
}: {
fileInput: HTMLInputElement;
}): Promise<ArrayLike<Blob>> {
return new Promise((resolve, reject) => {
fileInput.addEventListener("change", () => {
resolve(fileInput.files);
});
});
}
here is how to do it in vanilla javascript
function readFile({
fileInput,
}) {
return new Promise((resolve, reject) => {
fileInput.addEventListener("change", () => {
resolve(fileInput.files);
});
});
}
It is not related to "security reasons" . And it does not matter if it local or file on network drive.
The solution for Windows OS could be IIS - Internet Information Services
and this is some details :
To open file in browser with Java Script window.open() , the file should be available on WEB server.
By creating Virtual Directory on your IIS that mapped to any physical drive you should be able to open files.
The virtual directory will have some http: address.
So instead of window.open("file:///D:/Hello.txt");
You will write window.open("http://iis-server/MY_VIRTUAL_DRIVE_D/Hello.txt");
The xmlhttp request method is not valid for the files on local disk because the browser security does not allow us to do so.But we can override the browser security by creating a shortcut->right click->properties In target "... browser location path.exe" append --allow-file-access-from-files.This is tested on chrome,however care should be taken that all browser windows should be closed and the code should be run from the browser opened via this shortcut.
You can't. New browsers like Firefox, Safari etc. block the 'file' protocol. It will only work on old browsers.
You'll have to upload the files you want.
Javascript cannot typically access local files in new browsers but the XMLHttpRequest object can be used to read files. So it is actually Ajax (and not Javascript) which is reading the file.
If you want to read the file abc.txt, you can write the code as:
var txt = '';
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function(){
if(xmlhttp.status == 200 && xmlhttp.readyState == 4){
txt = xmlhttp.responseText;
}
};
xmlhttp.open("GET","abc.txt",true);
xmlhttp.send();
Now txt contains the contents of the file abc.txt.