I am trying to fix a form double submit by disabling the submit button temporarily and changing the submit button value to "processing..." so the user knows what is going on.

The disable works `onClick` and the "Submit" value changes to "processing...", however I am unable to change the value back to "Submit" after the `setTimeout` function has ended. 

Does anyone know how I could go about doing this?

```js
$(function() {
  $("#submit_btn").click(function() {
    $("#submit_btn").attr("disabled", "disabled");
    this.value = "Processing...";
    setTimeout(function() {
      this.value = "Submit"; //<- this line doesn't work
      $("#submit_btn").removeAttr("disabled");
    }, 5000);
  });
});
```

```html
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input id="submit_btn" type="submit" value="Submit" />
```