How to make Multiple ajax requests in a loop return values sequentially?

Question

I have to make a series of Ajax requests on a loop. Around 100 of them. And each request returns a JSONP variable. I extract data from the JSON and keep appending the value into a div. The problem is that I want the div to be appended with data in the order of function call. i.e sequentially. Now i get a different order everytime i refresh the page depending on the order in which the request completes. Here's my code.

  $.each(elem, function (index, item) {

            $.ajax({
                type: 'post' ,
                url: moviesSearchUrl + '&q=' + encodeURI(item) + '&page_limit=1',
                dataType: "jsonp",
                async: false, 
                success: searchCallback
            });

            function searchCallback(data) {
                var movies = data.movies;

                var markup = index + ': '+   movies[0].title + '<img class=" bord" src="' + movies[0].posters.thumbnail + '" /><br/>';

                $("div.content").append(markup);
            }

        });
});

As i am displaying the value of the index inside the div, everytime i get random orders . 2 4 3 1 7 sometimes and 1 5 2 7 4 sometimes. I even tries async: false . That doesnt help. I read somewhere that JSONP cannot be done with async: false . Please help me out.

Answer 1

Don't use a for-loop. Use a recursive function:

var i = 1;

function loadNext(){
    if (i < 5){
        $.ajax({
            type: "GET",
            url: "results/result_html.php?usn="+i+"&resultType="+resultType,
            dataType:"JSON",
            success:function(result){
                finalResult+=result;
                result=result+htmlMessage;
                $("#info").hide();
                $("#result").html(result);              
                $("#usn").attr("placeholder", "Class USN");
                loadNext();
            }
        });
        i++;
    }
}