Call python function with ajax and flask continously

Question

I need to call flask function in python with ajax continously. To that I have following script in html file.

<script  >
 var ajaxFUN = function () {
   $.ajax({
     url: '/toAjax',
     dataType: 'json',
     success: function (data) {
       console.log('get info');
       $('#data').html(data['data']);
     }
   });
 }
 setTimeout(ajaxFUN, 1);
</script>

And here is the python code

@app.route('/toAjax')
def ajaxTo():

    print("AJAX WAS HERE")
    data= reader.getToAjax()

    info = {
        "data": data

    }
    return jsonify(info)

I need to call /toAjax header route in the python continously without hitting any button or any kind of method.

But that implementation prints only once AJAX WAS HERE. Where is the missing part ? How can I fix it ?

Here is the similiar questions which I have looked: setTimeout() and setting parameters how to make ajax calls continuously for 5 seconds once

setTimeout(ajaxFUN, 1); calls it once - and I wouldn't use setInterval with an interval of 1, that would be ridiculous - hint: add ajaxFUN() after the line $('#data').html(data['data']); to call the function again once the previous request is done — Jaromanda X
– Jaromanda X, Commented Sep 19, 2019 at 8:03

Jaromanda X · Accepted Answer · 2019-09-19 08:12:12Z

2

setTimeout triggers exactly once (unless cancelled)

you could use setInterval, but that's likely to flood your server at the rate you've used for setTimeout

I would recommend the following

 var ajaxFUN = function () {
   $.ajax({
     url: '/toAjax',
     dataType: 'json',
     success: function (data) {
       console.log('get info');
       $('#data').html(data['data']);
       ajaxFUN(); // this calls the function again
     }
   });
 }
 ajaxFUN();

In case you're worried, there's no "recursion", since ajaxFUN() is being called in an asynchronous callback

answered Sep 19, 2019 at 8:12

Jaromanda X

1

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4 Comments

GhostDede Over a year ago

Thank you very much it worked. But I have question, using this kind of code is it appropriate for application ?

Jaromanda X Over a year ago

depends on what you mean by "this kind of code" - do you mean "code that does what you want"?

GhostDede Over a year ago

Yes exactly code that does what I want, because I am new in this area, and stackoverflow is only my guidleline. Thanks for your contribution. Therefore I am not sure whether it is ok or not

Jaromanda X Over a year ago

@GhostDede - well, the only reason this may not be "appropriate" is if the server can't handle the constant requests

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