I have to create a html list with one li name import . On back i have create input type ="file" which will be hidden .
If user click on import it should fire file upload from back using .click()[![enter image description here][1]][1].
Once the use select the .json file it can be of any name ..
Then On click of open button of file upload it should save the json and pass the json object with an event dispatcher . I have create event dispatcher but not able to get json
Issue : I am not able to save the json object using .onChange and also .onChange work single time then i have to refresh then it work again.
Requirement: On click of import button, hidden file import will fire then on selecting the json file of any name (json filem can be of any name) function will save the json object and json object will be sent using iframe using event dispatcher .
Issue:: Not able to save the json or get the json . I tried getjson but it if for single file name .
<!DOCTYPE html>
<html>
<meta charset="UTF-8"/>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$('button').click(function (){
$('#import').click();
});
$('#import').on('change',function () {
// not able to get json in a json object on selection of json file
var getJson = $('#import')[0].files;
// dispatcher just take json object and it will send to iframe .
// WindowDispatcher("Send Json", getJson);
});
});
</script>
</head>
<body>
<input type='file' id='import' style = "display:none" accept='.json ' aria-hidden="true" >
<ul>
<li>
<button id="importLink" >import</button>
</li>
</ul>
</body>
</html>
$(document).ready(function(){
$("#importLink").click(function(){
$("#import").click();
});
function readTextFile(file, callback) {
var rawFile = new XMLHttpRequest();
rawFile.overrideMimeType("application/json");
rawFile.open("GET", file, true);
rawFile.onreadystatechange = function() {
if (rawFile.readyState === 4 && rawFile.status == "200") {
callback(rawFile.responseText);
}
}
rawFile.send(null);
}
$("#import").on('change',function(e){
var file = e. target. files[0];
var path = (window.URL || window.webkitURL).createObjectURL(file);
readTextFile(path, function(text){
var data = JSON.parse(text);
console.log(data);
//Your ajax call here.
});
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<input type="file" id="import" style="display:none" accept='.json' aria-hidden="true" >
<ul>
<li id="importLink">import</li>
</ul>
<output id="list"></output>
<div id="name">list</div>
<div id="age">list</div>
Read file from e. target. files[0];
Off what I can see, you are missing an argument list for your import onChange listener.
In the first image, you are calling $'#import').click() -- you are missing the leading (
you should be getting a javascript error when running the code you mentioned, since you don't include at least an empty argument list when the file input changes, though I could be wrong.
Related
So, I've been working on a page that uses only local files (server is not an option, unfortunately. Not even a localhost. The struggle is real.) and I've come to a situation where I need to grab text from a .csv file and populate it to the page. I have this bit of code that works, but I need to have a file set within the function when a button is pressed. Looking up the file manually isn't an option (to visualize what I'm doing, I'm making a mock database file in the most annoying way possible (because I have to, not because I want to)).
In the page I would have something like:
<button id="myButton" onclick="getText()"></button>
<script>
var myFile = "dataset.csv";
...
</script>
The following bit of code works (in regards to having it pull the data from the csv file), but, as I said, I need to pull the text from the file when a button is pressed and just have the file name set in the script, not pulling it up manually.
<!DOCTYPE html>
<html>
<body>
<input type="file" id="fileinput" />
<div id="outputdiv"></div>
<script type="text/javascript">
function readSingleFile(evt) {
var f = evt.target.files[0];
if (f) {
var r = new FileReader();
r.onload = function(e) {
var contents = e.target.result;
var splited = contents.split(/\r\n|\n|\r|,/g);
for (i=0; i<splited.length; i++){
document.getElementById("outputdiv").innerHTML = document.getElementById("outputdiv").innerHTML + splited[i] + "<br>";
}
}
r.readAsText(f);
} else {
alert("Failed to load file");
}
}
document.getElementById('fileinput').addEventListener('change', readSingleFile, false);
</script>
</body>
</html>
From what I can tell from the API, I would need to set the file attributes to a blob in order to pass it to FileReader. How I can do this without using an input box, I have no idea. There's also a 50% chance that I am completely wrong about this since I obviously don't know how to get this done.
If someone could show me how to achieve this with regards to what I'm looking for, it would be very much appreciated. I'm absolutely stumped.
Thank you.
Note: CORS restrictons will prevent this from working in most browsers. You can use FireFox Developer Edition, which disables CORS validation.
You can use an XMLHttpRequest to load a local file:
<!DOCTYPE html>
<html>
<body>
<button onclick="readSingleFile()">Click Me</button>
<div id="outputdiv"></div>
<script type="text/javascript">
function readSingleFile() {
let xhr = new XMLHttpRequest();
let url = "relative/path/to/file.txt;
if (!url) return;
xhr.onload = dataLoaded;
xhr.onerror = _ => "There was an error loading the file.";
xhr.overrideMimeType("text/plain");
xhr.open("GET",url);
xhr.send();
}
function dataLoaded(e){
var contents = e.target.responseText;
var splited = contents.split(/\r\n|\n|\r|,/g);
for (i=0; i<splited.length; i++){
document.getElementById("outputdiv").innerHTML = document.getElementById("outputdiv").innerHTML + splited[i] + "<br>";
}
</script>
</body>
</html>
In a class, I was asked to make a dynamic drop-down menu in a form using HTML5 and JavaScript. I did that here.
Now, I need to call data from a JSON file. I looked at other answers on SOF and am still not really understanding how to use JQuery to get info from the JSON file.
I need to have 2 fields: the first field is a Country. The JSON key is country and the value is state. A copy of the JSON file and contents can be found here. The second drop-down field adds only the values / arrays related to its associated Country.
Here is a copy of my HTML5 file:
<!DOCTYPE html>
<html lan="en">
<head>
<!-- <script type="text/javascript" src="sampleForm.js"></script>-->
<!-- <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script> -->
<script type="text/javascript" src="getData.js"></script>
<script type="text/javascript" src="moreScript.js"></script>
<meta charset="UTF-8";
<title>Select Country and State</title>
<link rel="stylesheet" href="formStyle.css" />
</head>
<body>
<form id="locationSelector" enctype='application/json'>
<br id="selectCountry"></br>
<select id='country'></select>
<br id="selectState">=</br>
<select id='state'></select>
</form>
</body>
</html>
Here is a copy of the JS file I wrote so far that tries to get the data from the JSON file and fails:
$(document).ready(function() {
var data = "countryState.JSON";
var $selectCountry = $("#country");
$.each(data.d, function(i, el) {
console.log(el);
$selectCountry.append($("<option />", { text: el }));
});
});
Here is the content from the other JS file that adds the field instruction:
var selectYourCountry = document.getElementById('selectCountry');
selectYourCountry.innerHTML = "Select Your Country: ";
var selectYourState = document.getElementById('selectState');
selectYourState.innerHTML = "Select Your State";
This was supposed to at least add the values to the field, but nothing but empty boxes appear on the web page.
I then need to make a conditional statement like the one at here but calling or referencing data from the JSON file.
I have only taken some HTML and JavaScript courses, not JQuery and JSON. So, your help will greatly increase my knowledge, which I will be very grateful for.
Thank you!!
I found this SOF answer and changed my JS file to the following:
$(document).ready(function()
{
$('#locationSelector').click(function() {
alert("entered in trial button code");
$.ajax({
type: "GET",
url:"countryState.JSON",
dataType: "json",
success: function (data) {
$.each(data.country,function(i,obj)
{
alert(obj.value+":"+obj.text);
var div_data="<option value="+obj.value+">"+obj.text+"</option>";
alert(div_data);
$(div_data).appendTo('#locator');
});
}
});
});
});
And, I edited my HTML document as follows:
<form id="locationSelector" enctype='application/json'></form>
I removed and added back the <select> tags and with the following at least I get a blank box:
`<form id="locationSelector" enctype='application/json'>
<select id="locator"></select>
</form>`
I feel like I am getting closer, but am still lost.
Can you try this:
$.get("countryState.JSON", function( data ) {
var html = "";
$.each(data.d, function(i, el) {
console.log(el);
html += "<option value='"+Your value+"'>"+Your displayed text+"</option>";
});
$('#state').html(html);
});
I am a coding beginner, and I am currently learning how to code in javascript. I am stuck on a practice problem, where I must utilize AJAX in order to retrieve data from a form, convert the data into JSON and then append a message that uses the JSON data that was created. When I click the submit button, the success function doesn't seem to be working. I am also using JQUERY. My main question is, must I create a separate JSON file, or will the JSON data be produced on it's own when I submit the form.
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<div class="tour" data-daily-price="357">
<h2>Paris, France Tour</h2>
<p>$<span id="total">2,499</span> for <span id="nights-count">7</span> Nights</p>
<form method="POST">
<p>
<label for="nights">Number of Nights</label>
</p>
<p>
<input type="number" name="nights" id="nights" value="7">
</p>
<input type="submit" value="book">
</form>
</div>
<script type="text/javascript" src="jquery-2.2.3.min copy 4.js"></script>
<script type="text/javascript" src="json.js"></script>
</body>
</html>
$(document).ready(function() {
$("form").on("submit", function(event) {
event.preventDefault();
$.ajax("http://localhost:8888/json.html", {
type: 'POST',
data: $("form").serialize(),
dataType: 'json',
contentType: "application/json",
success: function(data) {
var msg = $('<p></p>');
msg.append("Trip booked for " + data.nights+" nights.");
$(".tour").append(msg);
}
});
});
});
My main question is, must I create a separate JSON file
No. If you want to send JSON then you have to construct a string of JSON, but you don't need to make it a file.
or will the JSON data be produced on it's own when I submit the form.
No. You have to create the JSON yourself.
$("form").serialize() converts data into the application/x-www-form-urlencoded format. Don't use it if you want to send JSON.
There is no standard for encoding form data into JSON so you must loop over all the form controls (or the data in serializeArray) to build the data structure you want and then pass it though JSON.stringify.
Expanding on what Quentin said, you'll need to parse the fields and values out of the form yourself and put them in a JSON object. I've been using the following function (found on another stack overflow answer but I don't have the reference) which will iterate the form looking for named fields and then put that into a JSON object.
(function ($) {
$.fn.serializeFormJSON = function () {
var o = {};
var a = this.serializeArray();
$.each(a, function () {
if (o[this.name]) {
if (!o[this.name].push) {
o[this.name] = [o[this.name]];
}
o[this.name].push(this.value || '');
} else {
o[this.name] = this.value || '';
}
});
return o;
};
})(jQuery);
This function is added to the JQuery operator $ so can be called like
var data = $(this).serializeFormJSON();
And you can then use that directly in the AJAX call or stringify it first if necessary.
EDIT; meant to add that you should only call this inside of a form.submit callback as it will use the form as the this parameter.
I've tried use javascript to open text file and get his name and his content, so right now I'm stuck at string, because I used input - type file to get directory / path.
Anyway, my question what is wrong in the next code, and how can i get text file content using javascript?
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN""http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Display Text Files</title>
<script type="text/javascript">
var str = document.getElementById('txt').value;
function display() {
if (str != "") {
var filename = str.split("/").pop();
document.getElementById('filename').innerHTML = filename;
}
}
</script>
</head>
<body>
<form method="get" action="#" >
<input type="file" accept="text/plain" id="txt" />
<input type="submit" value="Display Text File" onclick="display();" />
</form>
</body>
</html>
EDIT: I also wanna disable in input file the all files opition (*) to text files only (.txt).
Thanks!
Modern browsers implementing FileReader can do this. To test your browser check if window.FileReader is defined.
Here is some code I wrote only this morning to do just this. In my case I simply drag a file onto the HTML element which is here referenced as panel.in1 but you can also use <input type="file" /> (see the reference below).
if (window.FileReader) {
function dragEvent (ev) {
ev.stopPropagation ();
ev.preventDefault ();
if (ev.type == 'drop') {
var reader = new FileReader ();
reader.onloadend = function (ev) { panel.in1.value += this.result; };
reader.readAsText (ev.dataTransfer.files[0]);
}
}
panel.in1.addEventListener ('dragenter', dragEvent, false);
panel.in1.addEventListener ('dragover', dragEvent, false);
panel.in1.addEventListener ('drop', dragEvent, false);
}
It is the reader.onloadend function which gets the text of the file which you recover in the event handler as this.result.
I got most of the mechanism on how to do this from MDN : https://developer.mozilla.org/en-US/docs/Using_files_from_web_applications
I want to upload a csv file and process the data inside that file. What is the best method to do so? I prefer not to use php script. I did the following steps. But this method only returns the file name instead of file path.So i didnt get the desired output.
<form id='importPfForm'>
<input type='file' name='datafile' size='20'>
<input type='button' value='IMPORT' onclick='importPortfolioFunction()'/>
</form>
function importPortfolioFunction( arg ) {
var f = document.getElementById( 'importPfForm' );
var fileName= f.datafile.value;
}
So how can i get the data inside that file?
The example below is based on the html5rocks solution. It uses the browser's FileReader() function. Newer browsers only.
See http://www.html5rocks.com/en/tutorials/file/dndfiles/#toc-reading-files
In this example, the user selects an HTML file. It is displayed in the <textarea>.
<form enctype="multipart/form-data">
<input id="upload" type=file accept="text/html" name="files[]" size=30>
</form>
<textarea class="form-control" rows=35 cols=120 id="ms_word_filtered_html"></textarea>
<script>
function handleFileSelect(evt) {
let files = evt.target.files; // FileList object
// use the 1st file from the list
let f = files[0];
let reader = new FileReader();
// Closure to capture the file information.
reader.onload = (function(theFile) {
return function(e) {
jQuery( '#ms_word_filtered_html' ).val( e.target.result );
};
})(f);
// Read in the image file as a data URL.
reader.readAsText(f);
}
document.getElementById('upload').addEventListener('change', handleFileSelect, false);
</script>
you can use the new HTML 5 file api to read file contents
https://developer.mozilla.org/en-US/docs/Using_files_from_web_applications
but this won't work on every browser so you probably need a server side fallback.
The example below shows the basic usage of the FileReader to read the contents of an uploaded file. Here is a working Plunker of this example.
function init() {
document.getElementById('fileInput').addEventListener('change', handleFileSelect, false);
}
function handleFileSelect(event) {
const reader = new FileReader()
reader.onload = handleFileLoad;
reader.readAsText(event.target.files[0])
}
function handleFileLoad(event) {
console.log(event);
document.getElementById('fileContent').textContent = event.target.result;
}
<!DOCTYPE html>
<html>
<head>
<script src="script.js"></script>
</head>
<body onload="init()">
<input id="fileInput" type="file" name="file" />
<pre id="fileContent"></pre>
</body>
</html>
There exist some new tools on the blob itself that you can use to read the files content as a promise that makes you not have to use the legacy FileReader
// What you need to listen for on the file input
function fileInputChange (evt) {
for (let file of evt.target.files) {
read(file)
}
}
async function read(file) {
// Read the file as text
console.log(await file.text())
// Read the file as ArrayBuffer to handle binary data
console.log(new Uint8Array(await file.arrayBuffer()))
// Abuse response to read json data
console.log(await new Response(file).json())
// Read large data chunk by chunk
console.log(file.stream())
}
read(new File(['{"data": "abc"}'], 'sample.json'))
Try This
document.getElementById('myfile').addEventListener('change', function() {
var GetFile = new FileReader();
GetFile .onload=function(){
// DO Somthing
document.getElementById('output').value= GetFile.result;
}
GetFile.readAsText(this.files[0]);
})
<input type="file" id="myfile">
<textarea id="output" rows="4" cols="50"></textarea>
FileReaderJS can read the files for you. You get the file content inside onLoad(e) event handler as e.target.result.