The function onReady() fails to trigger the execution of $.getJSON() upon page restoration in the browser

Initially, I want to mention that the code below functions perfectly when I launch a new browser tab and enter my web server's URL. It also works fine when I reload the page (using F5 or Ctrl-R). However, it only partially works if I reopen a closed browser window and the browser restores my old tabs. In this scenario, today's date gets updated and displayed as expected (see the simple code below), but the getJSON() call doesn't seem to be triggered. The browser continues to show data from the previous session until I manually refresh the page (using F5) to update the data.
I am confident that the issue is not with the server. So, what else could possibly be causing this problem?

The browsers being used are Firefox and Chrome, both running the latest versions.

This is the code utilized in index.html

<script>
  $(document).ready(onReady());
</script>

and this is the code found in helper.js

var onReady = function() {
  // Display current date
  var dateText = moment().format("dddd, Do MMMM YYYY");
  var dateHTML = "<h2>" + dateText + "</h2>";
  $("#date-col").append(dateHTML);
  :
  :
  // Retrieve data from server and display it
  var statText = "Statistics:";
  $.getJSON("courses/starter", function(data) {
    statText = statText.concat(" " + data.count + " starter");
    $.getJSON("courses/dessert", function(data) {
      statText = statText.concat(", " + data.count + " dessert");
      $("#statistics").text(statText);
    });
  });
}

Answer №1

Instead of executing the function immediately, you need to pass a callback.

Consider this alternative approach:

<script>
  $(document).ready(onReady);
</script>

Answer №2

When using $( document ).ready(handler)
, the argument should be a function expression that will be executed later when the DOM is ready.

In the given example, the onReady() function is being called and since it does not return anything (undefined), the execution will look like this: $(document).ready(undefined);

To fix this issue, you can either use a function expression like $(document).ready(onReady); or make sure that onReady() returns a function to be executed later.

A shortcut for this would be $(onReady)

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