add support for iframe embedding

helpers.js

@@ -36,4 +36,12 @@ function nl2br(str, is_xhtml) {
 
 function scrollWindowDown() {
     window.scrollTo(0, document.body.scrollHeight)
+}
+
+function inIframe() {
+    try {
+        return window.self !== window.top;
+    } catch (e) {
+        return true;
+    }
 }

index.php

@@ -16,6 +16,9 @@
             <input type="text" name="name" placeholder="name" minLength="3" maxLength="20" class="modal__form-input">
             <input type="submit" value="»" class="modal__form-submit">
         </form>
+        <div class="modal__info_url">
+            to only see chat, go <a href="https://live.sdbs.cz/sermon" target="_top">https://live.sdbs.cz/sermon</a>
+        </div>
     </div>
 <?php } ?>
 

main.css

@@ -135,6 +135,15 @@ body {
     background: none;
 }
 
+.modal__info_url {
+    text-align: center;
+    visibility: hidden;
+}
+
+.modal__info_url a {
+    color: white;
+}
+
 @media (max-width: 640px) {
     .chat {
         padding: 10px 10px 50px 10px;

main.js

@@ -110,3 +110,7 @@ getMessages()
 setInterval(function () {
     getMessages()
 }, 2000)
+
+if (inIframe()) {
+    document.querySelector('.modal__info_url').style.visibility = 'visible';
+}