SweetAlert dropdown dynamically add items in list
As the SweetAlert2 documentation says, inputOptions parameter can be object or Promise.
To populate select items dynamically you should use promises, here's the simple example:
var inputOptionsPromise = new Promise(function (resolve) { // get your data and pass it to resolve() setTimeout(function () { resolve({ '#FF0000': 'Red', '#00FF00': 'Green', '#0000FF': 'Blue' }) }, 2000)})Swal.fire({ input: 'select', inputOptions: inputOptionsPromise})<script src="https://cdn.jsdelivr.net/npm/sweetalert2@11"></script>Notice, that SweetAlert2 will automatically show a loader until the Promise for inputOptions parameter will be resolved or rejected.