File API

How To Read A Text File In Html

As is being discussed in Itay Moav’s answer, writing to a local file with a local HTML file is perhaps going to be an issue without running in an elevated privilege mode and having additional Javascript capabilities (that allow you to save local files). However, accessing a local file from an HTML file is entirely possible.

My local text file      
Hello World!
      etc. 

Reading a txt file using html/javascript

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function read() < // var file = fopen(getScriptPath("a.txt"), 0); // var file_length = flength(file); // var content = fread(file, file_length); //document.getElementById("myDiv").innerText = content; try < var fso = new ActiveXObject('Scripting.FileSystemObject'); alert('ok'); var fh = fso.OpenTextFile('a.txt',1); var contents = fh.ReadAll(); fh.Close(); alert(contents); //return contents; >catch (Exception) < alert('Cannot open file :('); >>

LearnReading Files Using The HTML5 FileReader API

var reader = new FileReader(); var reader = new FileReader(); reader.onload = function(e) < var text = reader.result; >reader.readAsText(file, encoding); var reader = new FileReader(); reader.onload = function(e) < var dataURL = reader.result; >reader.readAsDataURL(file); var reader = new FileReader(); reader.onload = function(e) < var rawData = reader.result; >reader.readAsBinaryString(file); var reader = new FileReader(); reader.onload = function(e) < var arrayBuffer = reader.result; >reader.readAsArrayBuffer(file); reader.abort();     
Text File Reader 
Select a text file:     window.onload = function() < var fileInput = document.getElementById('fileInput'); var fileDisplayArea = document.getElementById('fileDisplayArea'); fileInput.addEventListener('change', function(e) < // Put the rest of the demo code here. >); > var file = fileInput.files[0]; var textType = /text.*/; if (file.type.match(textType)) < var reader = new FileReader(); reader.onload = function(e) < fileDisplayArea.innerText = reader.result; >reader.readAsText(file); > else < fileDisplayArea.innerText = "File not supported!"; >     
Image File Reader 
Select an image file:     window.onload = function() < var fileInput = document.getElementById('fileInput'); var fileDisplayArea = document.getElementById('fileDisplayArea'); fileInput.addEventListener('change', function(e) < // Put the rest of the demo code here. >); > var file = fileInput.files[0]; var imageType = /image.*/; if (file.type.match(imageType)) < var reader = new FileReader(); reader.onload = function(e) < fileDisplayArea.innerHTML = ""; // Create a new image. var img = new Image(); // Set the img src property using the data URL. img.src = reader.result; // Add the image to the page. fileDisplayArea.appendChild(img); >reader.readAsDataURL(file); > else

How to read a local text file using JavaScript?

FileReader.readAsText (): Reads the contents of the specified input file. The result attribute contains the contents of the file as a text string. This method can take encoding version as the second argument (if required). The default encoding is UTF-8. In this case we are using FileReader.readAsText () method to read local .txt file. This code

Making a paragraph in html contain a text from a file

1. check if you have php on your server. 2) change the file extension of your .html file to .php. 3) paste the code from my PHP example somewhere in the body of your newly-renamed PHP file. Share. edited Jan 28 at 16:40. answered Jun … var txtFile = new XMLHttpRequest(); txtFile.open("GET", "http://my.remote.url/myremotefile.txt", true); txtFile.onreadystatechange = function() < if (txtFile.readyState === 4 && txtFile.status == 200) < allText = txtFile.responseText; >document.getElementById('your div id').innerHTML = allText; function load() < var file = new XMLHttpRequest(); file.open("GET", "http://remote.tld/random.txt", true); file.onreadystatechange = function() < if (file.readyState === 4) < // Makes sure the document is ready to parse if (file.status === 200) < // Makes sure it's found the file text = file.responseText; document.getElementById("div1").innerHTML = text; >> > > window.onLoad = load();

 var txtFile = new XMLHttpRequest(); var allText = "file not found"; txtFile.onreadystatechange = function () < if (txtFile.readyState === XMLHttpRequest.DONE && txtFile.status == 200) < allText = txtFile.responseText; allText = allText.split("\n").join("
"); > document.getElementById('txt').innerHTML = allText; > txtFile.open("GET", '/result/client.txt', true); txtFile.send(null);

How to read a text file saved on my computer using javascript

I have a text file that is being updated regularly and I want to know if it is possible to read the file, line by line, with javascript and save the values in variables and then update the html page with the new values every time the page is loaded.

var value1; var value2; document.getElementsByClassName("class for 
")[0].innerHTML = value; document.getElementsByClassName("class for another 
")[0].innerHTML = value; < result.innerHTML = reader.result >) reader.readAsText(file, 'UTF-8')        
        
 

How to: Read text from a file

Example: Synchronous read in a console app. The following example shows a synchronous read operation within a console app. This example opens the text file using a stream reader, copies the contents to a string, and outputs the string to the console.

using System; using System.IO; class Program < public static void Main() < try < // Open the text file using a stream reader. using (var sr = new StreamReader("TestFile.txt")) < // Read the stream as a string, and write the string to the console. Console.WriteLine(sr.ReadToEnd()); >> catch (IOException e) < Console.WriteLine("The file could not be read:"); Console.WriteLine(e.Message); >> > Imports System.IO Module Program Public Sub Main() Try ' Open the file using a stream reader. Using sr As New StreamReader("TestFile.txt") ' Read the stream as a string and write the string to the console. Console.WriteLine(sr.ReadToEnd()) End Using Catch e As IOException Console.WriteLine("The file could not be read:") Console.WriteLine(e.Message) End Try End Sub End Module using System.IO; using System.Windows; namespace TextFiles; /// 
/// Interaction logic for MainWindow.xaml ///
 public partial class MainWindow : Window < public MainWindow() =>InitializeComponent(); private async void MainWindow_Loaded(object sender, RoutedEventArgs e) < try < using (var sr = new StreamReader("TestFile.txt")) < ResultBlock.Text = await sr.ReadToEndAsync(); >> catch (FileNotFoundException ex) < ResultBlock.Text = ex.Message; >> > Imports System.IO Imports System.Windows ''' 
''' Interaction logic for MainWindow.xaml '''
 Partial Public Class MainWindow Inherits Window Public Sub New() InitializeComponent() End Sub Private Async Sub MainWindow_Loaded(sender As Object, e As RoutedEventArgs) Try Using sr As New StreamReader("TestFile.txt") ResultBlock.Text = Await sr.ReadToEndAsync() End Using Catch ex As FileNotFoundException ResultBlock.Text = ex.Message End Try End Sub End Class

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Load data from txt file in HTML

Solution 2: Question: I want to show contents of uploaded file in html, I can just upload a text file. So my question is, how do I use JavaScript to read in a text file, then display the contents of that text file on a webpage in HTML?

Load data from txt file in HTML

I have a simple code where

this is standard what i want to do is to load this data from a text file on the server without using java is it possible?

I want to link between text file and browser

HTML is not a programming language. It's a mark-up language designed to define documents and nothing else. You can't write programs in plain HTML.

Now, there are some languages that allow to define documents and write programs (think of PostScript) but it's not the case of HTML. The additional functionalities you can find in modern web sites is provided by other languages and technologies that interact with HTML: CSS, JavaScript, Java, Flash.

The most obvious tool to accomplish your goals is JavaScript. That's good news because JavaScript is not Java 🙂

Have a look at this jQuery example that roughly does what you are asking. jQuery is a popular JavaScript library that's quite easy to use.

You cannot process a text file using HTML alone.

If the text file is located on the server, you either have to use server-side scripting (e.g. PHP) and process it directly or client side scripting (e.g. JavaScript) to download the file from the server and then process it.

Read from and write to HTML document, Write data to HTML document. Now, we will see how you may write some text in an HTML document. The following JavaScript code may be used to create a new paragraph in an HTML document and add some text within that. var w3r_text = "This text will be added to HTML"; var newParagraph = …

Reading in a text file to display in HTML

I am just working on a web site for fun and I was wondering if you could use JavaScript to read in a local text file and then display it HTML. So for example if I had a text file saved with my project then could I write a function in JavaScript that reads the entire file and then just displays all that text within on the web page?

I've looked around and tried to find something that will do this, but I don't think I fully understand. I have:

function readFile(fileName) < var fileRead = new ActiveXObject('Scripting.FileSystemObject'); text = fileRead.OpenTextFile(fileName, 1, false, 0); while(!text.AtEndOfSteam)< text += text.ReadLine(); >text.Close(); > 

I don't know if this is will work or do what I want to do. So my question is, how do I use JavaScript to read in a text file, then display the contents of that text file on a webpage in HTML?

You have to use the File API.

var input = document.getElementById("myFile"); var output = document.getElementById("output");input.addEventListener("change", function () < if (this.files && this.files[0]) < var myFile = this.files[0]; var reader = new FileReader(); reader.addEventListener('load', function (e) < output.textContent = e.target.result; >); reader.readAsBinaryString(myFile); > >);

After reading your comment, i think this is what you want.

var output = document.getElementById("output");$("a").on("click", function (e) < e.preventDefault(); $.ajax(this.href).done(function(data) < output.textContent = data; >); >);

    ); reader.readAsBinaryString(myFile); > >);   

Text Box in HTML – The Input Field HTML Tag, Conclusion. To sum up, to create a text input field in HTML, you need at least: An element, which typically goes inside a element. To set the type attribute to have a value of text. This will create a single line text input field. Don't forget to add a name attribute.

Reading uploaded text file contents in html

I want to show contents of uploaded file in html, I can just upload a text file. My example.html:

  
Please specify a file, or a set of files: 

How can I show contents of any uploaded text file in textarea shown below?

I've came here from google and was surprised to see no working example.

You can read files with FileReader API with good cross-browser support.

const reader = new FileReader() reader.onload = event => console.log(event.target.result) // desired file content reader.onerror = error => reject(error) reader.readAsText(file) // you could also read images and other binaries 

See fully working example below.

document.getElementById('input-file') .addEventListener('change', getFile)function getFile(event) < const input = event.target if ('files' in input && input.files.length >0) < placeFileContent( document.getElementById('content-target'), input.files[0]) >>function placeFileContent(target, file) < readFileContent(file).then(content =>< target.value = content >).catch(error => console.log(error)) >function readFileContent(file) < const reader = new FileReader() return new Promise((resolve, reject) => < reader.onload = event =>resolve(event.target.result) reader.onerror = error => reject(error) reader.readAsText(file) >) >

 Specify a file: 
  Solution 2: 

 Select a File to Load: Load Selected File 

function loadFileAsText()< var fileToLoad = document.getElementById("fileToLoad").files[0]; var fileReader = new FileReader(); fileReader.onload = function(fileLoadedEvent)< var textFromFileLoaded = fileLoadedEvent.target.result; document.getElementById("inputTextToSave").value = textFromFileLoaded; >; fileReader.readAsText(fileToLoad, "UTF-8"); > 

 
Please specify a file, or a set of files:

function myFunction() < var x = document.getElementById("myFile"); var txt = ""; if ('files' in x) < if (x.files.length == 0) < txt = "Select one or more files."; >else < for (var i = 0; i < x.files.length; i++) < txt += (i+1) + ". file"; var file = x.files[i]; if ('name' in file) < txt += "name: " + file.name + ""; >if ('size' in file) < txt += "size: " + file.size + " bytes "; >> > > else < if (x.value == "") < txt += "Select one or more files."; >else < txt += "The files property is not supported by your browser!"; txt += "The path of the selected file: " + x.value; // If the browser does not support the files property, it will return the path of the selected file instead. >> document.getElementById("demo").innerHTML = txt; > 

HTML Text Formatting, HTML _{Element. The HTML element defines subscript text. Subscript text appears half a character below the normal line, and is sometimes rendered in a smaller font. Subscript text can be used for chemical formulas, like H 2 O:}

Load text from local .txt file into html textarea using JavaScript

I have a element and a button that calls a loadFile() JavaScript function. I want this function to allow me to load the text from a .txt file on my local machine into the textarea. Any help with this would be greatly appreciated!

You can use the File and FileReader objects to read local files .

You can use an input element with type="file" to allow the user to select a file.

After the user has selected a file, you can get the File object from the input element. For example.

var file = document.getElementById("myFile").files[0]; 

You can then use a FileReader object to read the file into the text area. For example.

var reader = new FileReader(); reader.onload = function (e) < var textArea = document.getElementById("myTextArea"); textArea.value = e.target.result; >; reader.readAsText(file); 

I found a old topic about this: How do I load the contents of a text file into a javascript variable ?

Have you read the last answer already? This works with a div instead of a textbox, but you could adapt the code a bit.

In the last piece of the last commenters post you could change this line:

document.getElementById("id01").innerHTML = out; 

document.getElementById("textbox01").innerHTML = out; 

function loadFile() < var xmlhttp = new XMLHttpRequest(); var url = "file.txt"; xmlhttp.onreadystatechange = function() < if (xmlhttp.readyState == 4 && xmlhttp.status == 200) < var myArr = JSON.parse(xmlhttp.responseText); myFunction(myArr); console.log("xmlhttp Request Asepted"); >> xmlhttp.open("GET", url, true); xmlhttp.send(); function myFunction(arr) < var out = ""; var i; var row = 0; for(i = 0; i < arr.length; i++) < // console.log( arr[1].data); change data to what every you have in your file // out += arr[i].data + '
' + arr[i].data2 ; document.getElementById("textbox01").innerHTML = out; > > > 

How to get the pure text without HTML element using, var element = document.getElementById ('txt'); var text = element.innerText || element.textContent; element.innerHTML = text; Depending on what you need, you can use either element.innerText or element.textContent. They differ in many ways. innerText tries to approximate what would happen if you would select what you …

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