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diff --git a/examples/server/public_simplechat/ui.mjs b/examples/server/public_simplechat/ui.mjs
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+//@ts-check
+// Helpers to work with html elements
+// by Humans for All
+//
+
+
+/**
+ * Set the class of the children, based on whether it is the idSelected or not.
+ * @param {HTMLDivElement} elBase
+ * @param {string} idSelected
+ * @param {string} classSelected
+ * @param {string} classUnSelected
+ */
+export function el_children_config_class(elBase, idSelected, classSelected, classUnSelected="") {
+    for(let child of elBase.children) {
+        if (child.id == idSelected) {
+            child.className = classSelected;
+        } else {
+            child.className = classUnSelected;
+        }
+    }
+}
+
+/**
+ * Create button and set it up.
+ * @param {string} id
+ * @param {(this: HTMLButtonElement, ev: MouseEvent) => any} callback
+ * @param {string | undefined} name
+ * @param {string | undefined} innerText
+ */
+export function el_create_button(id, callback, name=undefined, innerText=undefined) {
+    if (!name) {
+        name = id;
+    }
+    if (!innerText) {
+        innerText = id;
+    }
+    let btn = document.createElement("button");
+    btn.id = id;
+    btn.name = name;
+    btn.innerText = innerText;
+    btn.addEventListener("click", callback);
+    return btn;
+}
+
+/**
+ * Create a para and set it up. Optionaly append it to a passed parent.
+ * @param {string} text
+ * @param {HTMLElement | undefined} elParent
+ * @param {string | undefined} id
+ */
+export function el_create_append_p(text, elParent=undefined, id=undefined) {
+    let para = document.createElement("p");
+    para.innerText = text;
+    if (id) {
+        para.id = id;
+    }
+    if (elParent) {
+        elParent.appendChild(para);
+    }
+    return para;
+}
+
+/**
+ * Create a button which represents bool value using specified text wrt true and false.
+ * When ever user clicks the button, it will toggle the value and update the shown text.
+ *
+ * @param {string} id
+ * @param {{true: string, false: string}} texts
+ * @param {boolean} defaultValue
+ * @param {function(boolean):void} cb
+ */
+export function el_create_boolbutton(id, texts, defaultValue, cb) {
+    let el = document.createElement("button");
+    el["xbool"] = defaultValue;
+    el["xtexts"] = structuredClone(texts);
+    el.innerText = el["xtexts"][String(defaultValue)];
+    if (id) {
+        el.id = id;
+    }
+    el.addEventListener('click', (ev)=>{
+        el["xbool"] = !el["xbool"];
+        el.innerText = el["xtexts"][String(el["xbool"])];
+        cb(el["xbool"]);
+    })
+    return el;
+}
+
+/**
+ * Create a div wrapped button which represents bool value using specified text wrt true and false.
+ * @param {string} id
+ * @param {string} label
+ * @param {{ true: string; false: string; }} texts
+ * @param {boolean} defaultValue
+ * @param {(arg0: boolean) => void} cb
+ * @param {string} className
+ */
+export function el_creatediv_boolbutton(id, label, texts, defaultValue, cb, className="gridx2") {
+    let div = document.createElement("div");
+    div.className = className;
+    let lbl = document.createElement("label");
+    lbl.setAttribute("for", id);
+    lbl.innerText = label;
+    div.appendChild(lbl);
+    let btn = el_create_boolbutton(id, texts, defaultValue, cb);
+    div.appendChild(btn);
+    return { div: div, el: btn };
+}
+
+
+/**
+ * Create a select ui element, with a set of options to select from.
+ * * options: an object which contains name-value pairs
+ * * defaultOption: the value whose name should be choosen, by default.
+ * * cb : the call back returns the name string of the option selected.
+ *
+ * @param {string} id
+ * @param {Object<string,*>} options
+ * @param {*} defaultOption
+ * @param {function(string):void} cb
+ */
+export function el_create_select(id, options, defaultOption, cb) {
+    let el = document.createElement("select");
+    el["xselected"] = defaultOption;
+    el["xoptions"] = structuredClone(options);
+    for(let cur of Object.keys(options)) {
+        let op = document.createElement("option");
+        op.value = cur;
+        op.innerText = cur;
+        if (options[cur] == defaultOption) {
+            op.selected = true;
+        }
+        el.appendChild(op);
+    }
+    if (id) {
+        el.id = id;
+        el.name = id;
+    }
+    el.addEventListener('change', (ev)=>{
+        let target = /** @type{HTMLSelectElement} */(ev.target);
+        console.log("DBUG:UI:Select:", id, ":", target.value);
+        cb(target.value);
+    })
+    return el;
+}
+
+/**
+ * Create a div wrapped select ui element, with a set of options to select from.
+ *
+ * @param {string} id
+ * @param {any} label
+ * @param {{ [x: string]: any; }} options
+ * @param {any} defaultOption
+ * @param {(arg0: string) => void} cb
+ * @param {string} className
+ */
+export function el_creatediv_select(id, label, options, defaultOption, cb, className="gridx2") {
+    let div = document.createElement("div");
+    div.className = className;
+    let lbl = document.createElement("label");
+    lbl.setAttribute("for", id);
+    lbl.innerText = label;
+    div.appendChild(lbl);
+    let sel = el_create_select(id, options,defaultOption, cb);
+    div.appendChild(sel);
+    return { div: div, el: sel };
+}
+
+
+/**
+ * Create a input ui element.
+ *
+ * @param {string} id
+ * @param {string} type
+ * @param {any} defaultValue
+ * @param {function(any):void} cb
+ */
+export function el_create_input(id, type, defaultValue, cb) {
+    let el = document.createElement("input");
+    el.type = type;
+    el.value = defaultValue;
+    if (id) {
+        el.id = id;
+    }
+    el.addEventListener('change', (ev)=>{
+        cb(el.value);
+    })
+    return el;
+}
+
+/**
+ * Create a div wrapped input.
+ *
+ * @param {string} id
+ * @param {string} label
+ * @param {string} type
+ * @param {any} defaultValue
+ * @param {function(any):void} cb
+ * @param {string} className
+ */
+export function el_creatediv_input(id, label, type, defaultValue, cb, className="gridx2") {
+    let div = document.createElement("div");
+    div.className = className;
+    let lbl = document.createElement("label");
+    lbl.setAttribute("for", id);
+    lbl.innerText = label;
+    div.appendChild(lbl);
+    let el = el_create_input(id, type, defaultValue, cb);
+    div.appendChild(el);
+    return { div: div, el: el };
+}