Default input value attribute is not handled properly

[quartertone]

(Related issues: https://github.com/t4t5/sweetalert/issues/809 , https://github.com/t4t5/sweetalert/issues/893 )

This seems to be an old promblem, but I think is quite important. This bug makes SweetAlert useless as a replacement for the Window.prompt() method.

Also note that this problem seems to occur even with the official example: Try the second example under https://sweetalert.js.org/guides/#using-dom-nodes-as-content

Example code:

document.getElementById("btn").onclick = function() {
 swal("Test default value", {
   buttons: {
    cancel: true,
    ok: {
     value: "Button value"
    }
   },
   content: {
    element: "input",
    attributes: {
     value: "Default value"
    }
   }
  })
  .then((result) => {
   console.log(result);
  });
}

Expected behavior.

• If the input text is changed, the new value should be passed as the result.
• If the input text is unchanged, the default value should be passed as the result.

What happens:

• If input text is changed, and [Enter] button is pressed, the new value is passed as expected. This is ok.
• If the [Enter] button is pressed without making any changes, NULL value is passed.
• If the [Ok] button is pressed/clicked, the BUTTON value gets passed regardless of whether the input text was changed or not.