Use AJAX to load webpage content into DIV

I have a text field. When I type something into than text field, I want to load stuff into the DIV below. That's my code equivalent:

<input type="text" onkeyup="/* I am not sure how it's done, but I'll just write: */ document.getElementById('search_results').innerHTML = getContents('search.php?query='+this.value);" /><br/>
<div id="search_results"></div>

Hope you can help. Thanks in advance!

EDIT: I would appreciate it if the solution did not involve using jQuery - as long as it's possible.

ANSWER: How I'm doing it:

<input type="text" onkeyup="loadSearchResults(this.value)" /><br/>
<div id="search_results"></div>

<script>
function loadSearchResults(query){

if (window.XMLHttpRequest){// code for IE7+, Firefox, Chrome, Opera, Safari
    var xmlhttp=new XMLHttpRequest();
}else{// code for IE6, IE5
    var xmlhttp=new ActiveXObject("Mi开发者_开发技巧crosoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function(){
    if (xmlhttp.readyState==4 && xmlhttp.status==200){
        document.getElementById("search_results").innerHTML=xmlhttp.responseText;
    }else if(xmlhttp.readyState>=1 && xmlhttp.status==200){
        // show the ajax loader or stuff like that...
    }
}
xmlhttp.open("GET","search.php?search="+query,true);
xmlhttp.send();

}
</script>

For AJAX projects start with a library like jQuery. It will handle a great deal of the work for you.

Using jQuery the steps would be something like:

1. Use the ajax command to retrieve the data from your server.

   $.ajax({
     url: 'search.php',
     data: "query=search_terms",
     success: finished(data));

2. update the div on result using a function like:

   
   function finished(result) {
       $('#search_results').innerHTML(result);
   }

You would do something like:

$("#inputid").keyup(function(evt) {
    $("#search_results").load("/getresults.php", {queryparam: evt.target.value});
});

Of course, it does end up being more complicated than that. You probably don't want to send a request to the server on every key press.What happens if the server takes a long time to respond? Should you provide some indication that a request to the server is being made?

If you use jQueryUI, you can use the autocomplete widget, which might get you closer to then end result you want.