How can I automate the timing of my Ajax calls at regular intervals?

Question

How can I automate the timing of my Ajax calls at regular intervals?

If I need to refresh an entire page every N seconds, I can include the following code in the HTML:

meta http-equiv="refresh" content="5"

Is there a common method for setting up periodic AJAX calls? I want to schedule an AJAX call to run every 10 seconds, for example, to update specific parts of the page without refreshing the entire page. It would be ideal if I could also schedule multiple AJAX calls at different intervals, as some parts of the page may require more frequent updates than others.

Thanks in advance!

javascript ajax http

Answer 1

Answer №1

To achieve your goal, consider utilizing either setTimeout or setInterval (the latter is likely more suitable for your needs).

setInterval(updateContent, (10 * 1000));

In this scenario, updateContent refers to a function that refreshes content through AJAX.

Answer 2

To achieve your goal, consider utilizing either setTimeout or setInterval (the latter is likely more suitable for your needs).

setInterval(updateContent, (10 * 1000));

In this scenario, updateContent refers to a function that refreshes content through AJAX.

Answer 3

Answer №2

function executeProxy()
{
  /* include code for invoking your Ajax function */
}

setInterval( executeProxy, 1000 ); // specify time interval in milliseconds

Answer 4

function executeProxy()
{
  /* include code for invoking your Ajax function */
}

setInterval( executeProxy, 1000 ); // specify time interval in milliseconds

Answer 5

Answer №3

To incorporate the setInterval method in Javascript, follow these steps:
Include the following code at the end of your webpage:

<script>
window.setInterval(function(){
  callAjaxFunction();  //executing every 5 seconds
}, 5000);

function callAjaxFunction(){
    //this function communicates with the server using ajax
}
</script>

Answer 6

To incorporate the setInterval method in Javascript, follow these steps:
Include the following code at the end of your webpage:

<script>
window.setInterval(function(){
  callAjaxFunction();  //executing every 5 seconds
}, 5000);

function callAjaxFunction(){
    //this function communicates with the server using ajax
}
</script>

Answer 7

Answer №4

Assuming we have a servlet with the URL Pattern /UpdateCount configured in web.xml to deliver dynamic data/content and a div element countStatDiv in the JSP page.

The code snippet below is responsible for automatically refreshing/updating the content of countStatDiv every 30 seconds using the GET method. The value of the variable seconds can be adjusted as needed:

                <script>
                    var request;
                    var seconds=30;
                    function getRequestObject(){
                    setInterval(function() {sendRequest();},seconds*1000);
                    if (window.ActiveXObject){
                    return (new ActiveXObject("Microsoft.XMLHTTP"));
                    } else if (window.XMLHttpRequest){
                    return(new XMLHttpRequest());
                    } else {
                    return (null);
                    }
                    }
                    function sendRequest(){
                    request = getRequestObject();
                    request.onreadystatechange = handleResponse;
                    request.open("GET", "../UpdateCount", true);
                    request.send(null);
                    }
                    function handleResponse(){
                    if((request.readyState == 4)&amp;&amp;(request.status == 200)){
                    var serverResponse = request.responseText;
                    var statCtrl=document.getElementById("countStatDiv");
                    statCtrl.innerHTML=serverResponse;
                    }
                    }
                </script>

Answer 8

Assuming we have a servlet with the URL Pattern /UpdateCount configured in web.xml to deliver dynamic data/content and a div element countStatDiv in the JSP page.

The code snippet below is responsible for automatically refreshing/updating the content of countStatDiv every 30 seconds using the GET method. The value of the variable seconds can be adjusted as needed:

                <script>
                    var request;
                    var seconds=30;
                    function getRequestObject(){
                    setInterval(function() {sendRequest();},seconds*1000);
                    if (window.ActiveXObject){
                    return (new ActiveXObject("Microsoft.XMLHTTP"));
                    } else if (window.XMLHttpRequest){
                    return(new XMLHttpRequest());
                    } else {
                    return (null);
                    }
                    }
                    function sendRequest(){
                    request = getRequestObject();
                    request.onreadystatechange = handleResponse;
                    request.open("GET", "../UpdateCount", true);
                    request.send(null);
                    }
                    function handleResponse(){
                    if((request.readyState == 4)&amp;&amp;(request.status == 200)){
                    var serverResponse = request.responseText;
                    var statCtrl=document.getElementById("countStatDiv");
                    statCtrl.innerHTML=serverResponse;
                    }
                    }
                </script>

How can I automate the timing of my Ajax calls at regular intervals?

Answer №1

Answer №2

Answer №3

Answer №4

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