Using setInterval() to do simplistic continuous polling

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From my comment:

I would use setTimeout [docs] and always call it when the previous response was received. This way you avoid possible congestion or function stacking or whatever you want to call it, in case a request/response takes longer than your interval.

So something like this:

function refresh() {
    // make Ajax call here, inside the callback call:
    setTimeout(refresh, 5000);
    // ...
}

// initial call, or just call refresh directly
setTimeout(refresh, 5000);

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