I need some help with ajax?

Question

As you know that ajax is asynchronous (happening at different times), that means say if i have two functions called in a sequence, one is for the ajax - goes to the server and fetches the data, and second one is to refresh the targetDiv to display the result, but the problem is that, if the internet is slow, the first one waits for the reponse from the server while the otherone refreshes the page even though the response is not received. and when the response is received, the targetDiv is not refreshed.

How can i call functions in sequence, say call a function or functions after the response is received.

Answer 1

Are you using the XMLHttpRequest object? It provides functionality that does just what you want. You should be using an onreadystatechange event to trigger the function that fills the target div, not just calling them directly in sequence.

Answer 2

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Answer 3

I agree with Drew,

(this is a pretty rough example but demonstrats the point)

function ajax(paramaters) {
// Mozilla version
if (window.XMLHttpRequest) {
xhr = new XMLHttpRequest();
}
// IE version
else if (window.ActiveXObject) {
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
xhr.open("POST","myPage.php");
xhr.setRequestHeader('Content-Type','application/x-www-form-urlencoded; charset=UTF-8');
xhr.send(paramaters);

// THE onreadystatechange FUNCTION

xhr.onreadystatechange= function() {
if (xhr.readyState==4) {
alert("I'm done loading");
document. getElementByID("Div") .innerHTML = xhr.responseText;
}
}


}