Kill Ajax Session Outside Of Originating Function

I have an AJAX function I'd like to kill, but it is outside of the function. Take a look: function waitForMsg(){ var heartbeat = $.ajax({ type: 'GET',

Solution 1:

I'd refactor a bit the code to avoid the usage of setInterval and clean up a bit the code.

You can abstract the logic in an object, let's say Request. You can add two methods to resume and stop which will handle the status of the underlying AJAX request.

varRequest = function(options){
    var request = this, xhr = null, aborted = false;

    /* Resumes the operation.
     * Starts a new request if there's none running.
     */
    request.resume = function() {
        aborted = false;
        request.retry();
    };

    /* Retry loop.
     */
    request.retry = function(){
        if(!xhr) {
            xhr = $.ajax(options).done(function(){
                request.destroy();
                !aborted && setTimeout(function(){
                    request.retry();
                }, options.timeout);
            });
        }
    };

    /* Aborts the current operation.
     */
    request.abort = function(){
        aborted = true;
        if(xhr) xhr.abort();
        request.destroy();
    };

    /* Destroy.
     */
    request.destroy = function(){
        xhr = null;
    };

    return request;
};

Now, you can drop the setInterval.

$(function () {
    var request = newRequest({
        type: "GET",
        url: "includes/push_events.php",
        timeout: 5000,
        success: function(data){ 
            /* Success handler */
        },
        error: function(data){
            /* Error handler */
        },
        dataType: "json"
    });

    $(window).focus(function () {
        request.resume();
    }).blur(function () {
        request.abort();
    });

    request.resume();
});

The Request constructor receives the $.ajax options which should contain an additional timeout parameter that specifies the delay between requests.

Solution 2:

You need to stop further request after window.blur. restart request after window.focus.

Modified code

var setTimeoutConst;
functionwaitForMsg(){
        if(!window_focus){
             return; //this will stop further ajax request
        }
       var heartbeat = $.ajax({
            type: "GET",
            url: "includes/push_events.php",
            tryCount : 0,
            retryLimit : 3,
            async: true,
            cache: false,
            // timeout: 500,success: function(data){ 
                console.log(data);
                if(data){
                    if(data.current_date_time){
                        updateTime(data.current_date_time);
                    }
                    if(data.color){
                        console.log("Receiving data");
                        displayAlert(data.color, data.notification_message, data.sound, data.title);
                    }
                    if(data.user_disabled){
                        console.log("Receiving data");
                        fastLogoff();
                        checkDisabled();
                    }       

                }
                setTimeoutConst= setTimeout(waitForMsg,5000);
            },
            error: function(data){
                if (data.status == 500) {
                    console.log("Connection Lost to Server (500)");
                       // $.ajax(this);
                } else {
                    console.log("Unknown Error. (Reload)");
                        //$.ajax(this);
                }
                setTimeoutConst= setTimeout(waitForMsg,5000); // continue sending request event if last request fail
            },
            dataType: "json"

        });
    };

var window_focus = true;
$(document).ready(function(){

    $('#alertbox').click(function(){
        $('#alertbox').slideUp("slow");
    });

    $('#alertbox').click(function(){
            $('#alertbox').slideUp("slow");
    });
    // Check focal point
     $(window).focus(function() {
        if(window_focus ){return}
        window_focus = true;
        waitForMsg(); 
        console.log('Focus');
    });
   $(window).blur(function() {
          if(!window_focus ){return}
        clearTimeout(setTimeoutConst);
        window_focus = false;
        console.log('Blur');
    });

    waitForMsg();            
});