select table rows and edit user

app/public/js/edit_user.js

@@ -0,0 +1,17 @@
+//wait for html site to be ready before executing init()
+if (document.readyState == "complete") {
+    init();
+} else {
+    document.addEventListener("DOMContentLoaded", init);
+}
+
+
+function init() {
+    var button = document.getElementById("edit_user");
+
+    button.onclick = function() {
+        var row = document.getElementsByClassName("selected")[0];
+        document.getElementById('user_id_val').value = row.id;
+        this.form.submit();
+    }
+}