Ajax requests with interval?

Hosting Support
1

Can we use ajax with interval to request info from the database?

2

You can use Javascript setInterval() function to run ajax request at regular intervals.

2 Likes
3

what is considered a regular interval. because so far im only getting one return and seems the rest are being blocked.

4

what are your codes? plus the file that you want get its data via ajax

5 
<script type="text/javascript">  
var preid;
function loop(){

var element = document.getElementById("start");
element.parentNode.removeChild(element);
window.setInterval(function getform()
{
var XHR = new XMLHttpRequest();
var form = document.getElementById("messageform");
var FD = new FormData(form);

console.log(XHR);
XHR.onload = () =>{
    var response
    console.log(XHR.responseText);
    try{
        response = JSON.parse(XHR.responseText);
    }catch (e){
        console.log(XHR.responseText);
        console.error('no parse');
    }
    if(response){
        handleresponse(response);
    }
}
XHR.open("POST", "update.php");
XHR.send(FD);
}, 2000);
}


function handleresponse(response){
console.log(response.message);
var message = response.message;
var id = response.id;
var ok = response.ok;
if(ok){
    addElement("infobox", "div", "message", message);
    document.getElementById("id").value = id;
}else{
    
}
}   

function addElement(parentId, elementTag, elementId, html) {
    // Adds an element to the document
    var p = document.getElementById(parentId);
    var newElement = document.createElement(elementTag);
    newElement.setAttribute('id', elementId);
    newElement.innerHTML = html;
    p.appendChild(newElement);
}


</script>
6 
update.php

mysqli_close($db);
$response = "<div id='message'>".$username.": > ".$message."</div>";

$data = array("message"=>$response, "id" => $id, "ok" => $ok);

echo json_encode($data);
7

{“message”:“

aracnophob: > request</div>”,“id”:null,“ok”:false}
priceless.php:38
aracnophob: > request

priceless.php:17 XMLHttpRequest {onreadystatechange: null, readyState: 0, timeout: 0, withCredentials: false, upload: XMLHttpRequestUpload, …}
priceless.php:20

{“message”:“

aracnophob: > send</div>”,“id”:null,“ok”:false}
priceless.php:38
aracnophob: > send

request comes through in first itteration. send did not

8

ahh. it keeps sending my id back as null. on my local server here it works just fine. but on the epizy host it doesnt.

9

yeah looks like its being blocked by the server :frowning:

10

What is being blocked by the server how? A PHP script which gets data from somewhere returns null where it should return a value?

1 Like
11

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