Question

i have an app (struts2+sprin+glassfish3.1.2) that sends an ajax (jquery) requests every second to the server. If certain conditions are met my js redirects me to other page, otherwise i do nothing.
It seems that after a long period (couple of hours without any redirect) the browser become unresponsive or it take a very long to time perform a request.
I mention that if when this happens i close the browser from the X and reopen it everything is ok. I did not manage to replicate this problem in my test environment, but it seems the i have this problem in production :( .

any ideea ?

i use Jquery (struts2-jquery-plugin3.3.0) for ajax calls,i will attach some of the code:
this method is accessed every 1 second :

function checkedForAnsweredCalls(){

    if (ajaxFinished == 1){

        ajaxFinished = 0;

        $.getJSON( redirectToTicket.html ,
                function(data) {

                    ajaxFinished = 1;
                    if (data != null){                      
                        window.location = data;         
                    }
                }
        );
    }


    };

by this piece of code:

<script>
            var ajaxFinished = 1;
            window.setInterval( "checkedForAnsweredCalls()", 1000 );            
        </script>

this ajax code access a struts2 action that has a json response type, so if some database conditions are met i get back an url.
thanks for the quick responses.

Answer 1

利用火焰来描述您的网络应用,应当告诉你在什么地方出现hang。

至于多次Ajax申请,没有网页更新,你可能需要某种麻省式图书馆,无论是手写还是免费(prototype.js就是一例)。

我使用以下法典来管理我,因此不能对此表示赞扬。我发现,法典的错误算法一环,一夫做了一些小改动。

var reqObj_arr = [];

function getXMLObject(index) {
    if(reqObj_arr[index]){
        return reqObj_arr[index];
    }

    var xmlHttp = false;
    try {
        xmlHttp = new ActiveXObject("Msxml2.XMLHTTP")  // For Old Microsoft Browsers
    } catch (e) {
        try {
            xmlHttp = new ActiveXObject("Microsoft.XMLHTTP")  // For Microsoft IE 6.0+
        } catch (e2) {
            xmlHttp = false   // No Browser accepts the XMLHTTP Object then false
        }
    }
    if (!xmlHttp && typeof XMLHttpRequest !=  undefined ) {
        xmlHttp = new XMLHttpRequest();        //For Mozilla, Opera Browsers
    }
    reqObj_arr[index] = xmlHttp;
    return xmlHttp;  // Mandatory Statement returning the ajax object created
}

    function ajaxFunction(url, target, params) {
        var getdate = new Date();  //Used to prevent caching during ajax call
        var xmlhttp = new getXMLObject(target);    //xmlhttp holds the ajax object

        if(xmlhttp) {
            xmlhttp.open("POST",url,true); //calling url using POST method
            xmlhttp.onreadystatechange  = function() {
                if (xmlhttp.readyState == 4) {
                    if(xmlhttp.status == 200) {
                        document.getElementById(target).innerHTML = xmlhttp.responseText;
                    }
                    else {
                        alert("Error during AJAX call. Please try again");
                    }
                }
            };
            xmlhttp.setRequestHeader( Content-Type , application/x-www-form-urlencoded );
            if(params){
                xmlhttp.send(params); // Posting to PHP file
            }
            else{
                xmlhttp.send(); // Posting to PHP file
            }
        }
    }

用这个词,在你的网页上添加以下线 Java。

var url =  URL to the .php file ;
var target =  ID of the element to add retrieved data to ;
var params =  Any other parameters to send ;
ajaxFunction(url,target,params);

any ideea ?

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