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xmlHTTPRequests code not working to fetch json from jsonbin

I am going to fetch a json file from jsonbin when clicking a button, but it is not working, your help is appreciated.
<button id="runxhr">RUN XHR</button>
<div id="main"></div>
js file is here:
function runXHR() {
let xhr = new XMLHttpRequest();
addListeners(xhr);
xhr.open(
"GET",
"https://api.jsonbin.io/v3/b/62b4395c449a1f3821167058/",
true
);
xhr.setRequestHeader("X-Bin-Meta", "false");
xhr.send();
return xhr.responseText;
}
function addListeners(xhr) {
xhr.addEventListener("loadend", display(xhr));
}
function display(jsonstring) {
let main = document.getElementById("main");
json = JSON.parse(jsonstring);
main.innerHTML = json[0]["name"];
}
const buttnRun = document.getElementById("runxhr");
buttnRun.addEventListener("click", () => {
runXHR();
});

JSONBin author here. You are doing several things wrong in the above example so I just refactored your code in general. Here's how you could fetch the JSON and print the body on click of a button.
To enhance it further, I have replaced your div tag with a pre tag, and I am using JSON.stringify() to pretty print the JSON to make it readable.
let btn = document.getElementById('runxhr');
btn.addEventListener('click', () => {
let req = new XMLHttpRequest();
req.onreadystatechange = () => {
if (req.readyState == XMLHttpRequest.DONE) {
document.getElementById('main').innerText = JSON.stringify(JSON.parse(req.responseText), null, 2);
}
};
req.open("GET", "https://api.jsonbin.io/v3/b/62b4395c449a1f3821167058/", true);
req.setRequestHeader("X-Bin-Meta", false);
req.send();
})
<button id="runxhr">Run XHR</button>
<pre id="main"></pre>

my ajax send post is not working in JS

I have a wordrpess site and I am trying to do an ajax call to send a variable but I cant make it work when I try to retrieve the variable I dont get anything back this is my code:
<script type="text/javascript">
window.onload = function(){
var boton = document.getElementsByClassName("teatro-buy");
const xhr = new XMLHttpRequest();
xhr.onload = function ()
{
console.log(this.responseText);
}
for (let qq = 0; qq < boton.length; qq++)
{
boton[qq].onclick = function()
{
botonid = this.id ;
xhr.open("POST", "ajaxcallnew.php")
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.send("lol=" + botonid);
console.log(botonid);
}
}
};
</script>
and this is my php
<?php
if(isset($_POST['lol'])){ //check if $_POST['examplePHP'] exists
echo $_POST['lol']; // echo the data
die(); // stop execution of the script.
}
?>

you can var_dump($_POST) or var_dump($_SERVER) or echo 1 ... if it's empty, your request is not arrive php
you can read the server log (such as nginx log, apache log ... almost they exist in runtime folder)
check your format:
examples:
(1) get:
var ajax = new XMLHttpRequest();
ajax.open('get','getStar.php?starName='+name);
ajax.send();
xhr.onreadystatechange = function () {
if (xhr.readyState == 4 && xhr.status == 200) {
console.log(xhr.responseText);
}
};
(2) post:
var xhr = new XMLHttpRequest();
xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xhr.open('post', '02.post.php' );
xhr.send('name=fox&age=18');
xhr.onreadystatechange = function () {
if (xhr.readyState == 4 && xhr.status == 200) {
console.log(xhr.responseText);
}
};

you must add to your request action property.
For example:
jQuery.ajax({
url: ajaxurl, // ('admin-ajax.php')
method: 'POST',
dataType: 'json',
data: {action: 'yourvalue', fields: info},
success: function (json) {
console.log(json)
});
and on functions.php add the following:
add_action('wp_ajax_nopriv_actionValue', 'FunkName');
add_action("wp_ajax_actionValue", 'FunkName');
function FunkName()
{
//buisness logic
}

Why not use jQuery for this. It would become very simple.
$.ajax({
url:'path_to_php_file.php',
type:'post',
data:{'lol':'value_for_lol'},
onsuccess:function(response){
alert(response);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
https://www.w3schools.com/jquery/default.asp

Send POST parameters AJAX without jQuery [duplicate]

I'd like to send some data using an XMLHttpRequest in JavaScript.
Say I have the following form in HTML:
<form name="inputform" action="somewhere" method="post">
<input type="hidden" value="person" name="user">
<input type="hidden" value="password" name="pwd">
<input type="hidden" value="place" name="organization">
<input type="hidden" value="key" name="requiredkey">
</form>
How can I write the equivalent using an XMLHttpRequest in JavaScript?

The code below demonstrates on how to do this.
var http = new XMLHttpRequest();
var url = 'get_data.php';
var params = 'orem=ipsum&name=binny';
http.open('POST', url, true);
//Send the proper header information along with the request
http.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
http.onreadystatechange = function() {//Call a function when the state changes.
if(http.readyState == 4 && http.status == 200) {
alert(http.responseText);
}
}
http.send(params);
In case you have/create an object you can turn it into params using the following code, i.e:
var params = new Object();
params.myparam1 = myval1;
params.myparam2 = myval2;
// Turn the data object into an array of URL-encoded key/value pairs.
let urlEncodedData = "", urlEncodedDataPairs = [], name;
for( name in params ) {
urlEncodedDataPairs.push(encodeURIComponent(name)+'='+encodeURIComponent(params[name]));
}

var xhr = new XMLHttpRequest();
xhr.open('POST', 'somewhere', true);
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
xhr.onload = function () {
// do something to response
console.log(this.responseText);
};
xhr.send('user=person&pwd=password&organization=place&requiredkey=key');
Or if you can count on browser support you could use FormData:
var data = new FormData();
data.append('user', 'person');
data.append('pwd', 'password');
data.append('organization', 'place');
data.append('requiredkey', 'key');
var xhr = new XMLHttpRequest();
xhr.open('POST', 'somewhere', true);
xhr.onload = function () {
// do something to response
console.log(this.responseText);
};
xhr.send(data);

Use modern JavaScript!
I'd suggest looking into fetch. It is the ES5 equivalent and uses Promises. It is much more readable and easily customizable.
const url = "http://example.com";
fetch(url, {
method : "POST",
body: new FormData(document.getElementById("inputform")),
// -- or --
// body : JSON.stringify({
// user : document.getElementById('user').value,
// ...
// })
}).then(
response => response.text() // .json(), etc.
// same as function(response) {return response.text();}
).then(
html => console.log(html)
);
In Node.js, you'll need to import fetch using:
const fetch = require("node-fetch");
If you want to use it synchronously (doesn't work in top scope):
const json = await fetch(url, optionalOptions)
.then(response => response.json()) // .text(), etc.
.catch((e) => {});
More Info:
Mozilla Documentation
Can I Use (96% Nov 2020)
David Walsh Tutorial

Here is a complete solution with application-json:
// Input values will be grabbed by ID
<input id="loginEmail" type="text" name="email" placeholder="Email">
<input id="loginPassword" type="password" name="password" placeholder="Password">
// return stops normal action and runs login()
<button onclick="return login()">Submit</button>
<script>
function login() {
// Form fields, see IDs above
const params = {
email: document.querySelector('#loginEmail').value,
password: document.querySelector('#loginPassword').value
}
const http = new XMLHttpRequest()
http.open('POST', '/login')
http.setRequestHeader('Content-type', 'application/json')
http.send(JSON.stringify(params)) // Make sure to stringify
http.onload = function() {
// Do whatever with response
alert(http.responseText)
}
}
</script>
Ensure that your Backend API can parse JSON.
For example, in Express JS:
import bodyParser from 'body-parser'
app.use(bodyParser.json())

Minimal use of FormData to submit an AJAX request
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="IE=Edge, chrome=1"/>
<script>
"use strict";
function submitForm(oFormElement)
{
var xhr = new XMLHttpRequest();
xhr.onload = function(){ alert (xhr.responseText); } // success case
xhr.onerror = function(){ alert (xhr.responseText); } // failure case
xhr.open (oFormElement.method, oFormElement.action, true);
xhr.send (new FormData (oFormElement));
return false;
}
</script>
</head>
<body>
<form method="post" action="somewhere" onsubmit="return submitForm(this);">
<input type="hidden" value="person" name="user" />
<input type="hidden" value="password" name="pwd" />
<input type="hidden" value="place" name="organization" />
<input type="hidden" value="key" name="requiredkey" />
<input type="submit" value="post request"/>
</form>
</body>
</html>
Remarks
This does not fully answer the OP question because it requires the user to click in order to submit the request. But this may be useful to people searching for this kind of simple solution.
This example is very simple and does not support the GET method. If you are interesting by more sophisticated examples, please have a look at the excellent MDN documentation. See also similar answer about XMLHttpRequest to Post HTML Form.
Limitation of this solution: As pointed out by Justin Blank and Thomas Munk (see their comments), FormData is not supported by IE9 and lower, and default browser on Android 2.3.

NO PLUGINS NEEDED!
Select the below code and drag that into in BOOKMARK BAR (if you don't see it, enable from Browser Settings), then EDIT that link :
javascript:var my_params = prompt("Enter your parameters", "var1=aaaa&var2=bbbbb"); var Target_LINK = prompt("Enter destination", location.href); function post(path, params) { var xForm = document.createElement("form"); xForm.setAttribute("method", "post"); xForm.setAttribute("action", path); for (var key in params) { if (params.hasOwnProperty(key)) { var hiddenField = document.createElement("input"); hiddenField.setAttribute("name", key); hiddenField.setAttribute("value", params[key]); xForm.appendChild(hiddenField); } } var xhr = new XMLHttpRequest(); xhr.onload = function () { alert(xhr.responseText); }; xhr.open(xForm.method, xForm.action, true); xhr.send(new FormData(xForm)); return false; } parsed_params = {}; my_params.split("&").forEach(function (item) { var s = item.split("="), k = s[0], v = s[1]; parsed_params[k] = v; }); post(Target_LINK, parsed_params); void(0);
That's all! Now you can visit any website, and click that button in BOOKMARK BAR!
NOTE:
The above method sends data using XMLHttpRequest method, so, you have to be on the same domain while triggering the script. That's why I prefer sending data with a simulated FORM SUBMITTING, which can send the code to any domain - here is code for that:
javascript:var my_params=prompt("Enter your parameters","var1=aaaa&var2=bbbbb"); var Target_LINK=prompt("Enter destination", location.href); function post(path, params) { var xForm= document.createElement("form"); xForm.setAttribute("method", "post"); xForm.setAttribute("action", path); xForm.setAttribute("target", "_blank"); for(var key in params) { if(params.hasOwnProperty(key)) { var hiddenField = document.createElement("input"); hiddenField.setAttribute("name", key); hiddenField.setAttribute("value", params[key]); xForm.appendChild(hiddenField); } } document.body.appendChild(xForm); xForm.submit(); } parsed_params={}; my_params.split("&").forEach(function(item) {var s = item.split("="), k=s[0], v=s[1]; parsed_params[k] = v;}); post(Target_LINK, parsed_params); void(0);

I have faced similar problem, using the same post and and this link I have resolved my issue.
var http = new XMLHttpRequest();
var url = "MY_URL.Com/login.aspx";
var params = 'eid=' +userEmailId+'&pwd='+userPwd
http.open("POST", url, true);
// Send the proper header information along with the request
//http.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
//http.setRequestHeader("Content-Length", params.length);// all browser wont support Refused to set unsafe header "Content-Length"
//http.setRequestHeader("Connection", "close");//Refused to set unsafe header "Connection"
// Call a function when the state
http.onreadystatechange = function() {
if(http.readyState == 4 && http.status == 200) {
alert(http.responseText);
}
}
http.send(params);
This link has completed information.

Try to use json object instead of formdata. below is the code working for me. formdata doesnot work for me either, hence I came up with this solution.
var jdata = new Object();
jdata.level = levelVal; // level is key and levelVal is value
var xhttp = new XMLHttpRequest();
xhttp.open("POST", "http://MyURL", true);
xhttp.setRequestHeader('Content-Type', 'application/json');
xhttp.send(JSON.stringify(jdata));
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
console.log(this.responseText);
}
}

There's some duplicates that touch on this, and nobody really expounds on it. I'll borrow the accepted answer example to illustrate
http.open('POST', url, true);
http.send('lorem=ipsum&name=binny');
I oversimplified this (I use http.onload(function() {}) instead of that answer's older methodology) for the sake of illustration. If you use this as-is, you'll find your server is probably interpreting the POST body as a string and not actual key=value parameters (i.e. PHP won't show any $_POST variables). You must pass the form header in to get that, and do that before http.send()
http.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
If you're using JSON and not URL-encoded data, pass application/json instead

var util = {
getAttribute: function (dom, attr) {
if (dom.getAttribute !== undefined) {
return dom.getAttribute(attr);
} else if (dom[attr] !== undefined) {
return dom[attr];
} else {
return null;
}
},
addEvent: function (obj, evtName, func) {
//Primero revisar attributos si existe o no.
if (obj.addEventListener) {
obj.addEventListener(evtName, func, false);
} else if (obj.attachEvent) {
obj.attachEvent(evtName, func);
} else {
if (this.getAttribute("on" + evtName) !== undefined) {
obj["on" + evtName] = func;
} else {
obj[evtName] = func;
}
}
},
removeEvent: function (obj, evtName, func) {
if (obj.removeEventListener) {
obj.removeEventListener(evtName, func, false);
} else if (obj.detachEvent) {
obj.detachEvent(evtName, func);
} else {
if (this.getAttribute("on" + evtName) !== undefined) {
obj["on" + evtName] = null;
} else {
obj[evtName] = null;
}
}
},
getAjaxObject: function () {
var xhttp = null;
//XDomainRequest
if ("XMLHttpRequest" in window) {
xhttp = new XMLHttpRequest();
} else {
// code for IE6, IE5
xhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
return xhttp;
}
};
//START CODE HERE.
var xhr = util.getAjaxObject();
var isUpload = (xhr && ('upload' in xhr) && ('onprogress' in xhr.upload));
if (isUpload) {
util.addEvent(xhr, "progress", xhrEvt.onProgress());
util.addEvent(xhr, "loadstart", xhrEvt.onLoadStart);
util.addEvent(xhr, "abort", xhrEvt.onAbort);
}
util.addEvent(xhr, "readystatechange", xhrEvt.ajaxOnReadyState);
var xhrEvt = {
onProgress: function (e) {
if (e.lengthComputable) {
//Loaded bytes.
var cLoaded = e.loaded;
}
},
onLoadStart: function () {
},
onAbort: function () {
},
onReadyState: function () {
var state = xhr.readyState;
var httpStatus = xhr.status;
if (state === 4 && httpStatus === 200) {
//Completed success.
var data = xhr.responseText;
}
}
};
//CONTINUE YOUR CODE HERE.
xhr.open('POST', 'mypage.php', true);
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
if ('FormData' in window) {
var formData = new FormData();
formData.append("user", "aaaaa");
formData.append("pass", "bbbbb");
xhr.send(formData);
} else {
xhr.send("?user=aaaaa&pass=bbbbb");
}

This helped me as I wanted to use only xmlHttpRequest and post an object as form data:
function sendData(data) {
var XHR = new XMLHttpRequest();
var FD = new FormData();
// Push our data into our FormData object
for(name in data) {
FD.append(name, data[name]);
}
// Set up our request
XHR.open('POST', 'https://example.com/cors.php');
// Send our FormData object; HTTP headers are set automatically
XHR.send(FD);
}
https://developer.mozilla.org/en-US/docs/Learn/HTML/Forms/Sending_forms_through_JavaScript

Short & modern
You can catch form input values using FormData and send them by fetch
fetch(form.action, {method:'post', body: new FormData(form)});
function send() {
let form = document.forms['inputform'];
fetch(form.action, {method:'post', body: new FormData(form)});
}
<form name="inputform" action="somewhere" method="post">
<input value="person" name="user">
<input type="hidden" value="password" name="pwd">
<input value="place" name="organization">
<input type="hidden" value="key" name="requiredkey">
</form>
<!-- I remove type="hidden" for some inputs above only for show them --><br>
Look: chrome console>network and click <button onclick="send()">send</button>

Just for feature readers finding this question. I found that the accepted answer works fine as long as you have a given path, but if you leave it blank it will fail in IE. Here is what I came up with:
function post(path, data, callback) {
"use strict";
var request = new XMLHttpRequest();
if (path === "") {
path = "/";
}
request.open('POST', path, true);
request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
request.onload = function (d) {
callback(d.currentTarget.response);
};
request.send(serialize(data));
}
You can you it like so:
post("", {orem: ipsum, name: binny}, function (response) {
console.log(respone);
})

Ajax script only working in Firefox (not working in Chrome, Safari, Edge,...)

this code is working fine in Firefox, but in all other browsers I have tested I get the error "SyntaxError: JSON Parse error: Unexpected EOF" in line if (this.readyState == 4 && this.status == 200). The json-string looks like this:
[{"ID":"1","token":"1234","name":"Test Satio","matno":"11111","reg_date":"2017-10-24 00:00:00","last_active":"2017-10-24 00:00:00","user_id":"25"},{"ID":"3","token":"2232434","name":"Test Satio 2","matno":"44444","reg_date":"2017-10-23 00:00:00","last_active":"0000-00-00 00:00:00","user_id":"25"},{"ID":"5","token":"32233","name":"Test Satio 3","matno":"12","reg_date":"0000-00-00 00:00:00","last_active":"0000-00-00 00:00:00","user_id":"25"}]
JS-Code:
$(document).ready(function postData() {
var id = localStorage.getItem('user-id');
var token = localStorage.getItem('user-token');
var vars = "id=" + id + "&token=" + token;
var hr = new XMLHttpRequest();
var url = "../php/getUsers.php";
hr.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) { //in this line I get the error
var data = JSON.parse(hr.responseText);
for(var i=0;i<data.length;i++){
var templateData = {
name: data[i].name,
id: data[i].id
};
var id=templateData['id'];
$.get('templates/user.htm', (function (templateData) {
return function(templates) {
var template = $(templates).filter('#user-template').html();
$('#user-container').append(Mustache.render(template, templateData));
}
})(templateData));
}
}
}
hr.open("POST", url, true);
hr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
hr.send(vars);
});
What do I need to change to get this code working in all browsers?
Thanks, Lukas

I don't think you need to fire off a request for the user template for each user, I think you can do it once and save it.
I've simplified your code a bit and changed your outer ajax to use jquery.
$(document).ready(function postData() {
$.post({
url: "../php/getUsers.php",
data: {
id: localStorage.getItem('user-id'),
token: localStorage.getItem('user-token')
},
dataType: 'JSON',
success: function (data) {
// now get the template
$.get('templates/user.htm', function (templates) {
var template = $(templates).filter('#user-template').html();
// we have the template and userdata array
data.map(function (el) {
return {id: el.id, name: el.name};
}).forEach(function (templateData) {
$('#user-container').append(Mustache.render(template, templateData));
});
});
}
});
});

Download and open PDF file using Ajax

I have an action class that generates a PDF. The contentType is set appropriately.
public class MyAction extends ActionSupport
{
public String execute() {
...
...
File report = signedPdfExporter.generateReport(xyzData, props);
inputStream = new FileInputStream(report);
contentDisposition = "attachment=\"" + report.getName() + "\"";
contentType = "application/pdf";
return SUCCESS;
}
}
I call this action through an Ajax call. I don't know the way to deliver this stream to browser. I tried a few things but nothing worked.
$.ajax({
type: "POST",
url: url,
data: wireIdList,
cache: false,
success: function(response)
{
alert('got response');
window.open(response);
},
error: function (XMLHttpRequest, textStatus, errorThrown)
{
alert('Error occurred while opening fax template'
+ getAjaxErrorString(textStatus, errorThrown));
}
});
The above gives the error:
Your browser sent a request that this server could not understand.

Here is how I got this working
$.ajax({
url: '<URL_TO_FILE>',
success: function(data) {
var blob=new Blob([data]);
var link=document.createElement('a');
link.href=window.URL.createObjectURL(blob);
link.download="<FILENAME_TO_SAVE_WITH_EXTENSION>";
link.click();
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
Updated answer using download.js
$.ajax({
url: '<URL_TO_FILE>',
success: download.bind(true, "<FILENAME_TO_SAVE_WITH_EXTENSION>", "<FILE_MIME_TYPE>")
});

You don't necessarily need Ajax for this. Just an <a> link is enough if you set the content-disposition to attachment in the server side code. This way the parent page will just stay open, if that was your major concern (why would you unnecessarily have chosen Ajax for this otherwise?). Besides, there is no way to handle this nicely acynchronously. PDF is not character data. It's binary data. You can't do stuff like $(element).load(). You want to use completely new request for this. For that pdf is perfectly suitable.
To assist you more with the server side code, you'll need to tell more about the language used and post an excerpt of the code attempts.

I don't really think that any of the past answers spotted out the problem of the original poster. They all presume a GET request while the poster was trying to POST data and get a download in response.
In the course of searching for any better answer we found this jQuery Plugin for Requesting Ajax-like File Downloads (if link is broken sometime in the future, see the internet archive).
In its "heart" it creates a "temporary" HTML form containing the given data as input fields. This form is appended to the document and posted to the desired URL. Right after that the form is removed again:
jQuery('<form action="'+ url +'" method="'+ (method||'post') +'">'+inputs+'</form>')
.appendTo('body').submit().remove()
Update Mayur's answer looks pretty promising and very simple in comparison to the jQuery plug-in I referred to.

This is how i solve this issue.
The answer of Jonathan Amend on this post helped me a lot.
The example below is simplified.
For more details, the above source code is able to download a file using a JQuery Ajax request (GET, POST, PUT etc). It, also, helps to upload parameters as JSON and to change the content type to application/json (my default).
The html source:
<form method="POST">
<input type="text" name="startDate"/>
<input type="text" name="endDate"/>
<input type="text" name="startDate"/>
<select name="reportTimeDetail">
<option value="1">1</option>
</select>
<button type="submit"> Submit</button>
</form>
A simple form with two input text, one select and a button element.
The javascript page source:
<script type="text/javascript" src="JQuery 1.11.0 link"></script>
<script type="text/javascript">
// File Download on form submition.
$(document).on("ready", function(){
$("form button").on("click", function (event) {
event.stopPropagation(); // Do not propagate the event.
// Create an object that will manage to download the file.
new AjaxDownloadFile({
url: "url that returns a file",
data: JSON.stringify($("form").serializeObject())
});
return false; // Do not submit the form.
});
});
</script>
A simple event on button click. It creates an AjaxDownloadFile object. The AjaxDownloadFile class source is below.
The AjaxDownloadFile class source:
var AjaxDownloadFile = function (configurationSettings) {
// Standard settings.
this.settings = {
// JQuery AJAX default attributes.
url: "",
type: "POST",
headers: {
"Content-Type": "application/json; charset=UTF-8"
},
data: {},
// Custom events.
onSuccessStart: function (response, status, xhr, self) {
},
onSuccessFinish: function (response, status, xhr, self, filename) {
},
onErrorOccured: function (response, status, xhr, self) {
}
};
this.download = function () {
var self = this;
$.ajax({
type: this.settings.type,
url: this.settings.url,
headers: this.settings.headers,
data: this.settings.data,
success: function (response, status, xhr) {
// Start custom event.
self.settings.onSuccessStart(response, status, xhr, self);
// Check if a filename is existing on the response headers.
var filename = "";
var disposition = xhr.getResponseHeader("Content-Disposition");
if (disposition && disposition.indexOf("attachment") !== -1) {
var filenameRegex = /filename[^;=\n]*=(([""]).*?\2|[^;\n]*)/;
var matches = filenameRegex.exec(disposition);
if (matches != null && matches[1])
filename = matches[1].replace(/[""]/g, "");
}
var type = xhr.getResponseHeader("Content-Type");
var blob = new Blob([response], {type: type});
if (typeof window.navigator.msSaveBlob !== "undefined") {
// IE workaround for "HTML7007: One or more blob URLs were revoked by closing the blob for which they were created. These URLs will no longer resolve as the data backing the URL has been freed.
window.navigator.msSaveBlob(blob, filename);
} else {
var URL = window.URL || window.webkitURL;
var downloadUrl = URL.createObjectURL(blob);
if (filename) {
// Use HTML5 a[download] attribute to specify filename.
var a = document.createElement("a");
// Safari doesn"t support this yet.
if (typeof a.download === "undefined") {
window.location = downloadUrl;
} else {
a.href = downloadUrl;
a.download = filename;
document.body.appendChild(a);
a.click();
}
} else {
window.location = downloadUrl;
}
setTimeout(function () {
URL.revokeObjectURL(downloadUrl);
}, 100); // Cleanup
}
// Final custom event.
self.settings.onSuccessFinish(response, status, xhr, self, filename);
},
error: function (response, status, xhr) {
// Custom event to handle the error.
self.settings.onErrorOccured(response, status, xhr, self);
}
});
};
// Constructor.
{
// Merge settings.
$.extend(this.settings, configurationSettings);
// Make the request.
this.download();
}
};
I created this class to added to my JS library. It is reusable. Hope that helps.

What worked for me is the following code, as the server function is retrieving File(memoryStream.GetBuffer(), "application/pdf", "fileName.pdf");:
$http.get( fullUrl, { responseType: 'arraybuffer' })
.success(function (response) {
var blob = new Blob([response], { type: 'application/pdf' });
if (window.navigator && window.navigator.msSaveOrOpenBlob) {
window.navigator.msSaveOrOpenBlob(blob); // for IE
}
else {
var fileURL = URL.createObjectURL(blob);
var newWin = window.open(fileURL);
newWin.focus();
newWin.reload();
}
});

To fix the blank PDF issue in post request to get stream data like PDF, we need to add response type as 'arraybuffer' or 'blob' in request
$.ajax({
url: '<URL>',
type: "POST",
dataType: 'arraybuffer',
success: function(data) {
let blob = new Blob([data], {type: 'arraybuffer'});
let link = document.createElement('a');
let objectURL = window.URL.createObjectURL(blob);
link.href = objectURL;
link.target = '_self';
link.download = "fileName.pdf";
(document.body || document.documentElement).appendChild(link);
link.click();
setTimeout(()=>{
window.URL.revokeObjectURL(objectURL);
link.remove();
}, 100);
}
});

You could use this plugin which creates a form, and submits it, then removes it from the page.
jQuery.download = function(url, data, method) {
//url and data options required
if (url && data) {
//data can be string of parameters or array/object
data = typeof data == 'string' ? data : jQuery.param(data);
//split params into form inputs
var inputs = '';
jQuery.each(data.split('&'), function() {
var pair = this.split('=');
inputs += '<input type="hidden" name="' + pair[0] +
'" value="' + pair[1] + '" />';
});
//send request
jQuery('<form action="' + url +
'" method="' + (method || 'post') + '">' + inputs + '</form>')
.appendTo('body').submit().remove();
};
};
$.download(
'/export.php',
'filename=mySpreadsheet&format=xls&content=' + spreadsheetData
);
This worked for me. Found this plugin here

Concerning the answer given by Mayur Padshala this is the correct logic to download a pdf file via ajax but as others report in the comments this solution is indeed downloads a blank pdf.
The reason for this is explained in the accepted answer of this question: jQuery has some issues loading binary data using AJAX requests, as it does not yet implement some HTML5 XHR v2 capabilities, see this enhancement request and this discussion.
So using HTMLHTTPRequest the code should look like this:
var req = new XMLHttpRequest();
req.open("POST", "URL", true);
req.responseType = "blob";
req.onload = function (event) {
var blob = req.response;
var link=document.createElement('a');
link.href=window.URL.createObjectURL(blob);
link.download="name_for_the_file_to_save_with_extention";
link.click();
}

The following code worked for me
//Parameter to be passed
var data = 'reportid=R3823&isSQL=1&filter=[]';
var xhr = new XMLHttpRequest();
xhr.open("POST", "Reporting.jsp"); //url.It can pdf file path
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.responseType = "blob";
xhr.onload = function () {
if (this.status === 200) {
var blob = new Blob([xhr.response]);
const url = window.URL.createObjectURL(blob);
var a = document.createElement('a');
a.href = url;
a.download = 'myFile.pdf';
a.click();
setTimeout(function () {
// For Firefox it is necessary to delay revoking the ObjectURL
window.URL.revokeObjectURL(data)
, 100
})
}
};
xhr.send(data);

Hope this will save you a few hours and spare you from a headache.
It took me a while to figure this out, but doing regular $.ajax() request ruined my PDF file, while requesting it through address bar worked perfectly.
Solution was this:
Include download.js: http://danml.com/download.html
Then use XMLHttpRequest instead of $.ajax() request.
var ajax = new XMLHttpRequest();
ajax.open("GET", '/Admin/GetPdf' + id, true);
ajax.onreadystatechange = function(data) {
if (this.readyState == 4)
{
if (this.status == 200)
{
download(this.response, "report.pdf", "application/pdf");
}
else if (this.responseText != "")
{
alert(this.responseText);
}
}
else if (this.readyState == 2)
{
if (this.status == 200)
{
this.responseType = "blob";
}
else
{
this.responseType = "text";
}
}
};
ajax.send(null);

create a hidden iframe, then in your ajax code above:
url: document.getElementById('myiframeid').src = your_server_side_url,
and remove the window.open(response);

This snippet is for angular js users which will face the same problem, Note that the response file is downloaded using a programmed click event.
In this case , the headers were sent by server containing filename and content/type.
$http({
method: 'POST',
url: 'DownloadAttachment_URL',
data: { 'fileRef': 'filename.pdf' }, //I'm sending filename as a param
headers: { 'Authorization': $localStorage.jwt === undefined ? jwt : $localStorage.jwt },
responseType: 'arraybuffer',
}).success(function (data, status, headers, config) {
headers = headers();
var filename = headers['x-filename'];
var contentType = headers['content-type'];
var linkElement = document.createElement('a');
try {
var blob = new Blob([data], { type: contentType });
var url = window.URL.createObjectURL(blob);
linkElement.setAttribute('href', url);
linkElement.setAttribute("download", filename);
var clickEvent = new MouseEvent("click", {
"view": window,
"bubbles": true,
"cancelable": false
});
linkElement.dispatchEvent(clickEvent);
} catch (ex) {
console.log(ex);
}
}).error(function (data, status, headers, config) {
}).finally(function () {
});

I have found a solution that solved this problem for me (blank pdf when using jquery ajax). I've found this magical solution here: https://www.py4u.net/discuss/904599 (Answer 2) and it involves adding xhrFields to your ajax call:
xhrFields: {
responseType: 'blob'
}
My working example:
$.ajax({
url: "myUrl",
type: 'GET',
headers: {"token": mySecurityToken},
xhrFields: {
responseType: 'blob'
},
data: {id: myId}
}).done(function( data, statusText, xhr ) {
var filename = "";
var disposition = xhr.getResponseHeader("Content-Disposition");
if (disposition && (disposition.indexOf("attachment") !== -1) || disposition.indexOf("filename") !== -1) {
var filenameRegex = /filename[^;=\n]*=(([""]).*?\2|[^;\n]*)/;
var matches = filenameRegex.exec(disposition);
if (matches != null && matches[1])
filename = matches[1].replace(/[""]/g, "");
}
var type = xhr.getResponseHeader("Content-Type");
var blob = new Blob([data], {type: type});
if (typeof window.navigator.msSaveBlob !== "undefined") {
// IE workaround for "HTML7007: One or more blob URLs were revoked by closing the blob for which they were created. These URLs will no longer resolve as the data backing the URL has been freed.
window.navigator.msSaveBlob(blob, filename);
} else {
var URL = window.URL || window.webkitURL;
var downloadUrl = URL.createObjectURL(blob);
if (filename) {
// Use HTML5 a[download] attribute to specify filename.
var a = document.createElement("a");
// Safari doesn"t support this yet.
if (typeof a.download === "undefined") {
window.location = downloadUrl;
} else {
a.href = downloadUrl;
a.download = filename;
document.body.appendChild(a);
a.click();
}
} else {
window.location = downloadUrl;
}
setTimeout(function () {
URL.revokeObjectURL(downloadUrl);
}, 100); // Cleanup
}
})
I hope this will solve this nasty issue for many of you.

var xhr;
var beforeSend = function(){
$('#pleasewaitDL').modal('show');
}
$(function () {
$('#print_brochure_link').click(function(){
beforeSend();
xhr = new XMLHttpRequest();
xhr.open("GET",$('#preparedPrintModalForm').attr('action'), true);
xhr.responseType = "blob";
xhr.onload = function (e) {
if (this.status === 200) {
var file = window.URL.createObjectURL(this.response);
var a = document.createElement("a");
a.href = file;
a.download = this.response.name || "Property Brochure";
console.log(file);
document.body.appendChild(a);
a.click();
window.onfocus = function () {
document.body.removeChild(a)
}
$('#pleasewaitDL').modal('hide');
};
};
xhr.send($('#preparedPrintModalForm').serialize());
});
$('#pleasewaitDLCancel').click(function() {
xhr.abort();
});
});

If you have to work with file-stream (so no physically saved PDF) like we do and you want to download the PDF without page-reload, the following function works for us:
HTML
<div id="download-helper-hidden-container" style="display:none">
<form id="download-helper-form" target="pdf-download-output" method="post">
<input type="hidden" name="downloadHelperTransferData" id="downloadHelperTransferData" />
</form>
<iframe id="pdf-helper-output" name="pdf-download-output"></iframe>
</div>
Javascript
var form = document.getElementById('download-helper-form');
$("#downloadHelperTransferData").val(transferData);
form.action = "ServerSideFunctionWhichWritesPdfBytesToResponse";
form.submit();
Due to the target="pdf-download-output", the response is written into the iframe and therefore no page reload is executed, but the pdf-response-stream is output in the browser as a download.

100% OK for all file types
// download the file
var link = document.createElement('a'),
filename = fname;
link.href = URL.createObjectURL(data);
link.download = filename;
link.click();

Do you have to do it with Ajax? Couldn't it be a possibility to load it in an iframe?

The best usage is to do an anchor or a form with the provided link, but it you need to do a validation or in other cases using jquery the best usage is to add a form and submit it using jquery (don't forget to set your request disposition as attachement on server side).
<form id="pdf-form" action="/link_to/download_your.pdf" accept-charset="UTF-8" method="get">
<input type="hidden" name="data" id="data" value="your data"></form>
and
Download my Pdf
then in jquery
$('#pdf').click(function () {
// your data if it json do it like this JSON.stringify(your_data_as_json)
$('#data').val(data);
$('#pdf-form').submit();
})