how ajax call works

$.ajax({ url: "Url", dataType: "json", type: "Post", async: true, data: {"Key":value,"Key2":value2}, success: function (data) { }, error: function (xhr, exception, thrownError) { var msg = ""; if (xhr.status === 0) { msg = "Not connect.\n Verify Network."; } else if (xhr.status == 404) { msg = "Requested page not found. [404]"; } else if (xhr.status == 500) { msg = "Internal Server Error [500]."; } else if (exception === "parsererror") { msg = "Requested JSON parse failed."; } else if (exception === "timeout") { msg = "Time out error."; } else if (exception === "abort") { msg = "Ajax request aborted."; } else { msg = "Error:" + xhr.status + " " + xhr.responseText; } if (callbackError) { callbackError(msg); } } });

how to make ajax request javascript

//Change the text of a <div> element using an AJAX //request:
//using JQuery


$("button").click(function(){
  $.ajax({url: "demo_test.txt", success: function(result){
    $("#div1").html(result);
  }});
});



//To send a request to a server, we use the open() //and send() methods of the XMLHttpRequest object:
// Javascript


xhttp.open("GET", "ajax_info.txt", true);
xhttp.send();

//example below
<html>
<body>

<h1>The XMLHttpRequest Object</h1>

<button type="button" onclick="loadDoc()">Request data</button>

<p id="demo"></p>


<script>
function loadDoc() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      document.getElementById("demo").innerHTML = this.responseText;
    }
  };
  xhttp.open("GET", "demo_get.asp", true);
  xhttp.send();
}
</script>

</body>
</html>

Posted by: Guest on January-17-2020

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