new XMLHttpRequest(); javascript code example
Example 1: xml http request
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
// Typical action to be performed when the document is ready:
document.getElementById("demo").innerHTML = xhttp.responseText;
}
};
xhttp.open("GET", "filename", true);
xhttp.send();
Example 2: javascript progress of xml http request
<!DOCTYPE html>
<html>
<body>
<p id="demo">result</p>
<button type="button" onclick="get_post_ajax();">Change Content</button>
<script type="text/javascript">
function update_progress(e)
{
if (e.lengthComputable)
{
var percentage = Math.round((e.loaded/e.total)*100);
console.log("percent " + percentage + '%' );
}
else
{
console.log("Unable to compute progress information since the total size is unknown");
}
}
function transfer_complete(e){console.log("The transfer is complete.");}
function transfer_failed(e){console.log("An error occurred while transferring the file.");}
function transfer_canceled(e){console.log("The transfer has been canceled by the user.");}
function get_post_ajax()
{
var xhttp;
if (window.XMLHttpRequest){xhttp = new XMLHttpRequest();}
else{xhttp = new ActiveXObject("Microsoft.XMLHTTP");}
xhttp.onprogress = update_progress;
xhttp.addEventListener("load", transfer_complete, false);
xhttp.addEventListener("error", transfer_failed, false);
xhttp.addEventListener("abort", transfer_canceled, false);
xhttp.onreadystatechange = function()
{
if (xhttp.readyState == 4 && xhttp.status == 200)
{
document.getElementById("demo").innerHTML = xhttp.responseText;
}
};
xhttp.open("GET", "http://it-tu.com/ajax_test.php", true);
xhttp.send();
}
</script>
</body>
</html>