call javascript function by interval but not asynchronously

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I have a function named createNotificTable().This function is using ajax to fetch data.I have to call it in every 5 sec.
"startNotificationTable()" is the function which is called from asp server code and the timer starts.

function startNotificationTable() {

window.setInterval(createNotificTable, 5000);

}

problem is that,createNotificTable is called every 5 sec even if the function is not finished,which creates problem.

So how to do this approach?I don't want to call it exact 5sec interval,just want to call repeatedly but after finishing the execution of this function.

But interval will be better because if the function finished in 2 sec then I don't want to call it immediately as it is accessing database.A interval will be better.

5sec or 10 sec will be better.

Please help.

Posted 21-Feb-15 20:34pm

souvikcode

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Kuthuparakkal 22-Feb-15 13:38pm

Set a variable say boolean var FuncRunnig = false
Set the var value appropriately, check this var before calling the function

souvikcode 22-Feb-15 22:39pm

this can not be done without callback.Because in ajax,the bool value may be changed before server side processing ends. I've tested this type of approach and it is wrong.

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souvikcode · Accepted Answer · 2015-02-22T05:31:00

Done by callback.

C#

function settimer() {
   alert('timer fired');
   setTimeout(function () {
       createNotificTable(function () {
           settimer();
       });
   }, 5000)
}

C#

function createNotificTable(callback) {

    var tbl = $("#gridNotificInbox tbody");
    var empid = $("#hdnempidmaster").val(); //logged in employee
    var maxid = 0;
    if (parseInt($('#gridNotificInbox tbody tr').length) > 0) {
        maxid = Math.max.apply(Math, $("#gridNotificInbox tbody tr td:first-child").map(function () {
            return $(this).text();
        }));
    }
    alert(maxid);

    $.ajax({
        type: "POST",
        url: "notification.aspx/ReturnTableRow",
        data: JSON.stringify({ maxidfetched: maxid, empid: empid }),
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        beforeSend: function () {

        },
        success: function (response) {
            if (response.d.trim() != "") {
                //tbl.prepend(response.d);
                //alert('hi');
                initializeDatatable(response.d);
            }
            callback();
        },
        failure: function (response) {
            //alert(response.d);
        }

    });
}