Multiple xhr onload

Question

I have this simple code for get elements from a external source

for(var i=0; i<10; i++)
    loadPage(link[i]);

function loadPage(href)
{
    var ajax = new XMLHttpRequest();
    ajax.open('get',href);
    ajax.responseType = 'document';
    ajax.onreadystatechange=function()
    {
        console.log(ajax.responseXML.querySelectorAll("a[href^='magnet']")[0].getAttribute("href"));
    }   
    ajax.send();
}

but when i read the console i get only 2 or 3 result instead of 10. i think is because i can't run multiple onload. How i can fix this?

score 0 · Accepted Answer · answered Dec 24 '14 at 13:03

0

By onload, you mean multiple ajax.send? that is likely not the problem.

Could is simply be that the returned ajax isn't returning something that matches your selector (magnet) or that your server doesn't answer properly to all requests? replace your console.log with a simple console.log ("Here be dragons");

If you ajax fetch pages from the same server, you should check the logs see how many requests do you have, and if you always reply correctly. Some servers will return at 50x error when too many requests in parallel, or put a breakpoint in your loadPage function, the pause is going to be enough to let the server process everything in time.

answered Dec 24 '14 at 13:03

Xavier

1,157
9
29

You're right. i get many 503 error so i think this is the problem. Now i have to handle this. Any idea? – feboss Dec 24 '14 at 13:16
It's normal than a server blocks or queue when too many requests from the same IP (eg. to prevent DoS). As for why it happens and how to tune, it's a server question, you might want to ask a new one – Xavier Dec 28 '14 at 19:12

Multiple xhr onload

1 Answers1