javascript-examples/doc/topics/Ajax.md

AJAX

let request = new XMLHttpRequest();
request.open("GET", "http://www.example.com/");
request.onreadystatechange = function () {
    if (this.readyState === 4 && request.status === 200) {
        let result = JSON.parse(request.responseText);
    }
};
request.send();

• open()
• setRequestHeader()
• responseType
  • attaybuffer
  • blob
  • document
  • json
  • text
• timeout
• onreadystatechange
  • UNSENT : 0
  • OPENED : 1
  • HEADERS_RECEIVED : 2
  • LOADING : 3
  • DONE : 4
• status, statusText
• send()
• response, responseText, responseURL, responseXML

let request = new XMLHttpRequest();
request.open("POST", "http://www.example.com/");
request.responseType = "json";
request.onreadystatechange = function () {
    if (this.readyState === DONE && request.status === 200) {
        let result = request.response;
    }
};
request.send(JSON.stringify({message : "Hello"}));