let timerId = setInterval(function () {
    if (document.getElementById('some-id') != null) {
    	var element = document.getElementById('some-id');
    	var event = new Event('input');
    	element.value = "322";
    	element.dispatchEvent(event);
        clearInterval(timerId);
    }
}, 250)

function waitForSubmitButton() {
	let timerId = setInterval(function () {
        if (document.getElementsByClassName('button-submit')[0] != undefined) {
        	console.log('button is ready');
        	console.log(document.getElementsByClassName('button-submit')[0]);
        	document.getElementsByClassName('button-submit')[0].click();
            clearInterval(timerId);
        }
        else
        	console.log(document) // возвращает document айфрейма
    }, 250)
}