hamann-ausgabe-core/HaWeb/wwwroot/js/register.js

const ACTIVATESEARCHFILTER = function(filter, button) {
    let f = filter.value;
    if (f === "") {
        button.disabled = true;
        return;
    }
    button.disabled = false;
}

let searchfilter = document.getElementById("ha-searchformtext");
let searchsubmitbtn = document.getElementById("ha-searchformsubmit");
let searchform = document.getElementById("ha-searchform");
ACTIVATESEARCHFILTER(searchfilter, searchsubmitbtn);
searchfilter.addEventListener("input", () => ACTIVATESEARCHFILTER(searchfilter, searchsubmitbtn));