xhr post send 1

xhr post send

var xhr = new XMLHttpRequest();
var params = 'field1='+postfield1+'&field2='+postfield2;
xhr.open('POST', 'http://exmaple.com', true);

//Send the proper header information along with the request
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');

xhr.onload = function() {//Call a function when the state changes.
    if(xhr.status == 200) {
        alert(this.responseText);
    }
}
xhr.send(params);

Here is what the above code is Doing:
1. Create a new XMLHttpRequest object
2. Create a variable to hold the data we want to send to the server
3. Open a connection to the server
4. Set the request header to tell the server what kind of data we’re sending
5. Create a function to handle the response from the server
6. Send the data to the server

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