What is the best way to trigger an API call using AJAX whenever the page loads and at regular intervals using `setInterval()` function?

Question

What is the best way to trigger an API call using AJAX whenever the page loads and at regular intervals using `setInterval()` function?

New to coding and seeking guidance:
I have a basic AJAX feature in my project that triggers a GET API request every 3 seconds:

<script>
    $(document).ready(
        function() {

            setInterval(function() {
                $.get('/value_one', function(res) {
                    $('#value_one').text(res);
                });
                $.get('/value_two', function(res) {
                    $('#value_two').text(res);
                });
            }, 3000);
        }
    );
</script>

Currently, this setup is functioning correctly. It successfully fetches data from my NodeJS server code every three seconds after the page has finished loading. However, I am looking to enhance it so that the values are also fetched upon page load, and then continue to update every three seconds thereafter. Can anyone advise on how to achieve this?

javascript ajax

Answer 1

Answer №1

Transform your code into a function and utilize setTimeout to run it on page load as well as every 3 seconds:

<head>
  <script>
    function fetchData() {
      $.get('/data_one', function(response) {
        $('#data_one').text(response);
      });
      $.get('/data_two', function(response) {
        $('#data_two').text(response);
      });

      setTimeout(fetchData, 3000);
    }

    fetchData();
  </script>

This approach ensures that your function will execute itself at intervals of 3 seconds without relying on the domready event.

Answer 2

Transform your code into a function and utilize setTimeout to run it on page load as well as every 3 seconds:

<head>
  <script>
    function fetchData() {
      $.get('/data_one', function(response) {
        $('#data_one').text(response);
      });
      $.get('/data_two', function(response) {
        $('#data_two').text(response);
      });

      setTimeout(fetchData, 3000);
    }

    fetchData();
  </script>

This approach ensures that your function will execute itself at intervals of 3 seconds without relying on the domready event.

Answer 3

Answer №2

Here is my preferred approach:

<script>
var retrieveData = function() {
    $.get('/data_one', function(response) {
        $('#data_one').text(response);
    });
    $.get('/data_two', function(response) {
        $('#data_two').text(response);
    });
};

$(document).ready(
    function() {
        retrieveData();
        setInterval(retrieveData, 3000);
    }
);
</script>

Answer 4

Here is my preferred approach:

<script>
var retrieveData = function() {
    $.get('/data_one', function(response) {
        $('#data_one').text(response);
    });
    $.get('/data_two', function(response) {
        $('#data_two').text(response);
    });
};

$(document).ready(
    function() {
        retrieveData();
        setInterval(retrieveData, 3000);
    }
);
</script>

Answer 5

Answer №3

Organize your AJAX call by creating a separate function for it:

function fetchValues() {
    $.get('/value_one', function(res) {
        $('#value_one').text(res);
    });

    $.get('/value_two', function(res) {
        $('#value_two').text(res);
    });
 }

Then, incorporate this function in the setInterval method and once the document has fully loaded like so:

<script>

    //define AJAX request as its own function
    function fetchValues() {
        $.get('/value_one', function(res) {
            $('#value_one').text(res);
        });

        $.get('/value_two', function(res) {
            $('#value_two').text(res);
        });
    }

    //execute after page load
    fetchValues();

    $(document).ready(
        //use setInterval to periodically call the function
        setInterval(fetchValues, 3000);
    );
</script>

Answer 6

Organize your AJAX call by creating a separate function for it:

function fetchValues() {
    $.get('/value_one', function(res) {
        $('#value_one').text(res);
    });

    $.get('/value_two', function(res) {
        $('#value_two').text(res);
    });
 }

Then, incorporate this function in the setInterval method and once the document has fully loaded like so:

<script>

    //define AJAX request as its own function
    function fetchValues() {
        $.get('/value_one', function(res) {
            $('#value_one').text(res);
        });

        $.get('/value_two', function(res) {
            $('#value_two').text(res);
        });
    }

    //execute after page load
    fetchValues();

    $(document).ready(
        //use setInterval to periodically call the function
        setInterval(fetchValues, 3000);
    );
</script>

Answer 7

Answer №4

It has been shown in this discussion that to initiate the interval immediately, both setInterval and the function should be called.

<script>
    function call() {
        $.get('/value_one', function(res) {
            $('#value_one').text(res);
        });

        $.get('/value_two', function(res) {
             $('#value_two').text(res);
        });
    }

    $(document).ready(function () {
        call();
        setInterval(call, 3000);
    });
</script>

Personally, I believe the optimal approach is to initially render the data from the server and then utilize an interval to update it every 3 seconds. This can be achieved with the help of ejs.

Furthermore, I suggest refreshing not every 3 seconds, but rather 3 seconds after the last update (following a response from the server).

Answer 8

It has been shown in this discussion that to initiate the interval immediately, both setInterval and the function should be called.

<script>
    function call() {
        $.get('/value_one', function(res) {
            $('#value_one').text(res);
        });

        $.get('/value_two', function(res) {
             $('#value_two').text(res);
        });
    }

    $(document).ready(function () {
        call();
        setInterval(call, 3000);
    });
</script>

Personally, I believe the optimal approach is to initially render the data from the server and then utilize an interval to update it every 3 seconds. This can be achieved with the help of ejs.

Furthermore, I suggest refreshing not every 3 seconds, but rather 3 seconds after the last update (following a response from the server).

What is the best way to trigger an API call using AJAX whenever the page loads and at regular intervals using `setInterval()` function?

Answer №1

Answer №2

Answer №3

Answer №4

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