Question

I’m doing a very simple Comet-like long polling in JavaScript
The code below seems to work, but is it recursively calling itself and eating resources? How do I tell ?

EDIT: Code edited as per Dogberts suggestion

$(document).ready(function () {
    function doSuccess(data) {
        $('#res').html(data.time + "<br/>" + data.data);
        startAjax();
    }
    function doError(jqXHR, textStatus, errorThrown) {
        $('#res').html(textStatus + ":" + errorThrown);
        startAjax();
    }
    function startAjax() {
        $.ajax({
            url: 'http://127.0.0.1:12345/',
            dataType: 'jsonp',
            success: doSuccess,  //Edit: updated as per Dogbert's suggestion
            error: doError
        });
    }
    startAjax();
});

I’ve run http://home.orange.nl/jsrosman/ against it and it looks to be OK there (I’m just being professionally paranoid) startAjax calls (well callsBack) to doSuccess which calls startAjax

Answer 1

No, this shouldn’t be eating any extra resources. You’re properly calling the method after the old request has been completed.

On a side note, this

        success: function (data) {
            doSuccess(data);
        },
        error: function (jqXHR, textStatus, errorThrown) {
            doError(jqXHR, textStatus, errorThrown);
        }

could be written as

success: doSuccess,
error: doError