ha_permissions/ui/adminCreate/index.js

export default {
    form: null,

    display(){
        if(this.form === null){
            this.form = document.querySelector("#adminCreatePage form");
            this.form.addEventListener("submit", (event)=>{
                this.submit(event);
            });
        }

        document.getElementById("adminCreateName").focus();
    },

    submit(event){
        event.preventDefault();

        const data = {
            name: document.getElementById("adminCreateName").value,
            email: document.getElementById("adminCreateEmail").value,
            password: document.getElementById("adminCreatePass").value,
            confirm_password: document.getElementById("adminCreatePassConf").value
        };

        fetch("/admin/first", {
            method: "POST",
            headers: {"Content-Type": "application/json"},
            credentials: "include",
            body: JSON.stringify(data)
        })
            .then((r)=>{
                if(!r.ok) return console.log(r.msg);

                return r.json();
            })
            .then((response)=>{
                openPage("login");
            })
            .catch((e)=>{
                console.log(e);
            });
    }
}