Develop Reference

Use data from Json to go to page

I am trying to make a landing page with json. I am trying to have it so when someone clicks it goes to a page from the json file. So far I have this:
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200)
{
var Link = JSON.parse(this.responseText);
document.getElementById("Link1").innerHTML = Link.title;
}
};
xmlhttp.open("GET", "link.json", true);
xmlhttp.send();
function click1(){
window.location.href = Link.link;
}
And when I click on it it gives me (from console):
(index):22 Uncaught ReferenceError: Link is not defined at click1 ((index):22) at HTMLAnchorElement.onclick ((index):8)

Assuming your JSON content has properties title and link, and that your click1 handler has been properly registered, you should be able to combine what you have into something like this:
function click1() {
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
var Link = JSON.parse(this.responseText);
document.getElementById("Link1").innerHTML = Link.title;
window.location.href = Link.link;
}
};
xmlhttp.open("GET", "link.json", true);
xmlhttp.send();
}
Note that setting the innerHTML of an element before window.location.href = Link.link; is somewhat pointless because updating window.location will cause a new page to load.

Appending div inside a div with js

Getting blank screen.
I have to insert a employee card inside a div with id="container" with info from JSON file . I have done styling in 'emp' class.
load();
function load()
{
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
var emp=JSON.parse(xhttp.responseText);
for(var i=0;i<emp.length;i++){
var d=document.createAttribute('div');
d.className='emp';
d.innerHTML="Inforamtion";
var c=document.getElementById('container')
c.appendChild(d);
}
}
};
xhttp.open("GET", "employee.json", true);
xhttp.send();
}

You need to use var d=document.createElement('div'); instead of createAttribute(). If you open the console in the browser after running your current code it will say something like (this is in Firefox) "Uncaught DOMException: Node.appendChild: May not add an Attribute as a child".

PHP functionality ($_[value]) in Javascript

I have been trying to get a php code to work through an ajax call but it doesnt seem to work (even though its posting and etc) when im simply assigning a value. I know the php code works when I just put it directly on the page but I want this to load after a button is pressed. My question is what would be the javascript equalivant to doing:
$_['dog'] = 'red';
Update:
the value 'dog' is already a value , the php code is simply changing it to 'red' for clarification. And the ajax call since I just wanted the code to be run this was my call :
function ajaxPost() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
console.log("success");
}
};
xhttp.open("POST", "https://linkto.com/lan.php", false);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.send();
}
ajaxPost();

How to know, when AJAX request is fully loaded in Native Javascript?

It is my AJAX call with setTimeout
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
document.getElementById('mainContent').style.display = 'none';
if (this.readyState == 4 && this.status == 200) {
xhttp.onload = function(){
document.getElementById("mainContent").innerHTML = this.responseText;
setTimeout(function(
document.getElementById("mainContent").style.display = 'block';
),1000);
}
}
};
xhttp.open("POST", "system.php", true);
xhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhttp.send("lang="+lang);
I want detect when ajax is fully loaded and I have also solution here
I have solution here but I can't understand how it work.
var oldOpen = XMLHttpRequest.prototype.open;
function onStateChange(event) {
// fires on every readystatechange ever
// use `this` to determine which XHR object fired the change event
}
XMLHttpRequest.prototype.open = function() {
// when an XHR object is opened, add a listener for its readystatechange events
this.addEventListener("readystatechange", onStateChange)
// run the real `open`
oldOpen.apply(this, arguments);
}
Can you example me how it work or write full code how it work ?

javascript load response of XMLHttpRequest after server answer

i'm stuck on an issue i could not find an answer to.
i have the following code:
function LanguageClicked(language_clicked){
var request = new XMLHttpRequest();
request.open("GET", "", false /* async */);
request.setRequestHeader("Accept-Language", language_clicked);
request.send();
----HERE SHOLUD BE THE CODE FOR CHANGING THE WEB PAGE TO THE SERVER
RESPONSE----
}
how can i do that? i want to change the current page to the server response page.

What do you think about this ?
function LanguageClicked(language_clicked) {
var request = new XMLHttpRequest();
request.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
// Here we go on the new page
window.location = xhttp.responseText;
}
};
request.open("GET", "", false /* async */ );
request.setRequestHeader("Accept-Language", language_clicked);
request.send();
}

Try this.
function LanguageClicked(language_clicked) {
var request = new XMLHttpRequest();
request.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
// Here we go on the new page
document.write(xhttp.responseText);
}
};
request.open("GET", "", false /* async */ );
request.setRequestHeader("Accept-Language", language_clicked);
request.send();
}