Develop Reference

Why isn't my POST XMLHttpRequest.Send working?

I am having issues correctly setting up my XMLHttpRequest object to POST data to a server. The data (from an HTML form) never seems to get posted, or at least readyState == 4 && status are never reached.
function PostToAPI() {
var payersName = document.forms["myForm"]["payersName"].value;
var recipientPhoneNumber = document.forms["myForm"]["recipientPhoneNumber"].value;
var apiKey = document.forms["myForm"]["apiKey"].value;
var params = "payersName="+payersName+
"&recipientPhoneNumber="+recipientPhoneNumber+
"&apiKey="+apiKey;
alert(params); // Note#1
var Url = "https://api.blackShawls.af/c2b"; // Note#2
var xhr = new XMLHttpRequest();
xhr.open('POST', Url, true);
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
xhr.onreadystatechange = processRequest;
function processRequest(e) {
if (xhr.readyState == 4 && xhr.status == 200) {
alert(xhr.responseText.headers.Host); // Note#3
}
}
xhr.send(params);
}
Notes
(Note#1) This alert yields the following result:
This suggests that the various fields from the HTML form have been successfully read in, and that everything is working just fine to this point.
(Note#2) The Url value here is fictitious, in contrast to one in my code.
(Note#3) The alert(xhr.responseText.headers.Host); never seems to fire-up, suggesting that the readyState and the status conditions are never met.
Or could it be that the xhr.send(params) is never sent?
Can someone kindly point out where I am going wrong in my code?
Looking forward to your help.

How to link JSON file so that it can be parsed and used to create an arraylist

I would like my program to import an JSON file, using the data to create an array-list then access the array-list so that I can display it on the web page.
I've tried using JSON.parse() but it only works when I do something like JSON.parse('[{"shape":"polygon"},{"shape":"square"}]); It doesn't work for parsing a JSON file that is not declared inside. My JSON file is saved to my desktop. I'm new to JavaScript and importing files so anything would be helpful!
I've tried using:
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
var myObject = JSON.parse(this.responseText);
}
};
xmlhttp.open("GET", "PATIENT51.txt", true);
xmlhttp.send();
I keep getting errors with: JSON.parse(this.responseText);
JSON.parse Error: Invalid character at position:5 problemlist1.html(3,5)

You can just have the log in xmlhttp scope and it'll work.
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if(this.readyState == 4 && this.status == 200) {
console.log(JSON.parse(this.responseText))
}
};
xmlhttp.open("GET", "PATIENT51.txt", true);
xmlhttp.send();
EDIT: seen your edit, in addition, make sure that your JSON has the right format:
{
"key1" : 1,
"key2" : 2,
"key3" : 3
}

Remove a line from JSON parse

I am working with JIVE JSON RESTFul API and on their API they have a security
(I am referring to the throw 'allowIllegalResourceCall is false.'; )
throw 'allowIllegalResourceCall is false.';
{
"id" : "52104",
}
I am using this code to try to PARSE IT:
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
var myObj = JSON.parse(this.responseText);
document.getElementById("topdisplay").innerHTML = myObj.id;
}
};
xmlhttp.open("GET", "http://mysite/API/",true);
xmlhttp.send();
And I am getting an error because of that starting line.
I looked everywhere to try finding a solution to skip that to the JSON PARSE would work but I can't seem to find a way that works to do it.
Also I know that the parsing code works because when I remove the first line it works perfectly.
Any help?

JIVE REST API introduced this to help prevent against JSON Hijacking back when web browsers were susceptible.
You'll need to first find {, and do a substring from that position to the end of the string.
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
var response = this.responseText
var myObj = JSON.parse(this.responseText.substring(this.response.indexOf('{')));
document.getElementById("topdisplay").innerHTML = myObj.id;
}
};
xmlhttp.open("GET", "http://mysite/API/",true);
xmlhttp.send();
NOTE:
using RegEx, you'll need to find the first line with throw and ending in a semi-colon, if found replace with an empty string.
JSON.parse(response.replace(/throw.*;/, "").trim());

Get JSON from local JavaScript

good afternoon. I'm developing an app that can get a JSON from local (manifest.json). I want to get this file from JavaScript and then read it. But I have a problem, I cant call this file. How can I?
var urlJSON = new XMLHttpRequest("manifes.json").toString;
var dataJSON = JSON.parse(urlJSON);
alert(dataJSON.name);

var xmlhttp = new XMLHttpRequest();
var url = 'manifest.json';
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
console.log(JSON.parse(xmlhttp.responseText));
}
if (xmlhttp.status == 404) {}
};
xmlhttp.open('GET', url, true);
xmlhttp.send();
Or run chrome with arguments --allow-file-access-from-files
Or download and create server for your app

Javascript / REST / Activiti - What am I doing wrong in my XMLHttpRequest?

I'm trying to learn how to use the Activiti REST api and I'm have trouble getting back data. I'm not very familiar with using rest apis so I may be making a stupid mistake, but as it stands I can't figure it out.
I've had success getting back JSON using the Advanced REST Client for Chrome but I can't seem to implement it with Javascript.
I'd really appreciate it if someone could point me in the right direction. Links to relevant tutorials and videos would also be much appreciated.
window.onload = function get_json() {
var hr = new XMLHttpRequest();
var url = "http://kermit:kermit#localhost:8080/activiti-rest/service/repository/process-definitions";
var result = document.getElementById("result");
hr.open("GET", url, true);
hr.setRequestHeader("Content-type", "application/json", true);
hr.onreadystatechange = function() {
if(hr.readystate == 4 && hr.status == 200) {
var data = JSON.parse(hr.responseText);
result.innerHTML = data;
}
}
hr.send();
}

Two problems. The main is that it's readyState, not readystate. So it should be
hr.onreadystatechange = function() {
if (hr.readyState == 4 && hr.status == 200) {
var data = JSON.parse(hr.responseText);
result.innerHTML = data;
}
}
The second problem is that you probably don't want to just assign object to innerHTML because it will be meaningless [object Object]. But rendering of the data is beyond this question.