carly31
6/25/2018 - 1:35 AM

Native XMLHttpRequest Object

var xhr = new XMLHttpRequest();
xhr.open('PUT', 'myservice/user/1234');
xhr.setRequestHeader('Content-Type', 'application/json');
xhr.onload = function() {
    if (xhr.status === 200) {
        var userInfo = JSON.parse(xhr.responseText);
    }
};
xhr.send(JSON.stringify({
    name: 'John Smith',
    age: 34
}));
var newName = 'John Smith',
    xhr = new XMLHttpRequest();

xhr.open('POST', 'myservice/username?id=some-unique-id');
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xhr.onload = function() {
    if (xhr.status === 200 && xhr.responseText !== newName) {
        alert('Something went wrong.  Name is now ' + xhr.responseText);
    }
    else if (xhr.status !== 200) {
        alert('Request failed.  Returned status of ' + xhr.status);
    }
};
xhr.send(encodeURI('name=' + newName));
var xhr = new XMLHttpRequest();
xhr.open('GET', 'myservice/username?id=some-unique-id');
xhr.onload = function() {
    if (xhr.status === 200) {
        alert('User\'s name is ' + xhr.responseText);
    }
    else {
        alert('Request failed.  Returned status of ' + xhr.status);
    }
};
xhr.send();