Is this how everyone does AJAX?

[tonyyeb]

Hi all

Looking into using AJAX for a new project I'm doing and found this...

<script type="text/javascript">
var http = false;

if(navigator.appName == "Microsoft Internet Explorer") {
  http = new ActiveXObject("Microsoft.XMLHTTP");
} else {
  http = new XMLHttpRequest();
}

function validate(user) {
  http.abort();
  http.open("GET", "ajax2.asp?name=" + user, true);
  http.onreadystatechange=function() {
    if(http.readyState == 4) {
      document.getElementById('foo').innerHTML = http.responseText;
    }
  }
  http.send(null);
}
</script>

<h1>Please choose your username:</h1>

<form>
  <input type="text" onkeyup="validate(this.value)" />
  <div id="foo"></div>
</form>

...which uses some code in ajax2.asp to determine whether a username is valid (checks for length, existing username in a database etc...). Is this how everyone else does AJAX?

 

[tonyyeb]

I must be having a slow day cause none of the examples seem to do what I've got in the example.

 

[tonyyeb]

Well guys, i'm loving jQuery and its simple AJAX methods. Found this great article about creating a simple chat app:

http://articles.sitepoint.com/article/ajax-jquery#

Nicely broken down made it easier to digest and understand. Recommended.