Autosave input box's to database during pause in typing?

Question

I have a large form on my website that I want to be able to autosave to a database as the user is filling it out. Almost identical to how google drive works when typing a document.

I am trying not to have a function that runs every X seconds but rather a function that runs when the user has taken a break in typing. So, if the user has not typed in 1 hour but is still on the page, it doesn't keep pushing save requests.

This is all I have so far which is a basic javascript form submit.

$("#page1Form").submit(function(event){
  event.preventDefault();  
  $changesSaved.text("Saving...");
  var url = "/backend/forms/page1-POST.php";
        $.ajax({
         type: "POST",
         url: url,
         data: $("#page1Form").serialize(),
         success: function(data) { $changesSaved.text(data); }
        });
  return false;
  });

Answer 1

Debounce the textarea change.

Demo: jsFiddle

Put your ajax call in the saveToDB() function. These event names('input propertychange change') will trigger on any form element change such as radio buttons, inputs, etc.

var timeoutId;
$('#the-textarea').on('input propertychange change', function() {
    console.log('Textarea Change');

    clearTimeout(timeoutId);
    timeoutId = setTimeout(function() {
        // Runs 1 second (1000 ms) after the last change    
        saveToDB();
    }, 1000);
});

function saveToDB()
{
    console.log('Saving to the db');    
}

---

Here is a full demo showing you how to debounce a full form and use ajax to send the data and then return the status (Saving, Saved, etc).

Demo full form and ajax: jsFiddle