diff --git a/src/App.tsx b/src/App.tsx
index 017957182..0563328aa 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -8,53 +8,136 @@ import { PostsList } from './components/PostsList';
 import { PostDetails } from './components/PostDetails';
 import { UserSelector } from './components/UserSelector';
 import { Loader } from './components/Loader';
+import { useEffect, useState } from 'react';
+import { User } from './types/User';
+import { Post } from './types/Post';
+import { getData } from './api/fetch';
 
-export const App = () => (
-  <main className="section">
-    <div className="container">
-      <div className="tile is-ancestor">
-        <div className="tile is-parent">
-          <div className="tile is-child box is-success">
-            <div className="block">
-              <UserSelector />
-            </div>
+export const App = () => {
+  const [users, setUsers] = useState<User[]>([]);
+  const [userId, setUserId] = useState<number | null>(null);
 
-            <div className="block" data-cy="MainContent">
-              <p data-cy="NoSelectedUser">No user selected</p>
+  const [isLoading, setIsLoading] = useState(false);
+  const [catchError, setCatchError] = useState(false);
 
-              <Loader />
+  const [posts, setPosts] = useState<Post[]>([]);
+  const [selectedPost, setSelectedpost] = useState<Post | null>(null);
+  const [emptyPosts, setEmptyPosts] = useState(false);
 
-              <div
-                className="notification is-danger"
-                data-cy="PostsLoadingError"
-              >
-                Something went wrong!
-              </div>
+  const fetchUsers = async () => {
+    try {
+      setIsLoading(true);
+      const url = '/users';
+      const currentUsers = await getData<User>(url);
+
+      setUsers(currentUsers);
+    } catch {
+      setCatchError(true);
+    } finally {
+      setIsLoading(false);
+      setTimeout(() => {
+        setCatchError(false);
+      }, 3000);
+    }
+  };
+
+  useEffect(() => {
+    fetchUsers();
+  }, []);
+
+  useEffect(() => {
+    setPosts([]);
+
+    if (users && userId) {
+      const fetchPosts = async () => {
+        try {
+          setIsLoading(true);
+          const url = `/posts?userId=${userId}`;
+
+          if (userId) {
+            const currentPosts = await getData<Post>(url);
+
+            if (currentPosts.length === 0) {
+              setEmptyPosts(true);
+            }
+
+            setPosts(currentPosts);
+          }
+        } catch {
+          setCatchError(true);
+        } finally {
+          setIsLoading(false);
+        }
+      };
 
-              <div className="notification is-warning" data-cy="NoPostsYet">
-                No posts yet
+      fetchPosts();
+    }
+  }, [users, userId]);
+
+  return (
+    <main className="section">
+      <div className="container">
+        <div className="tile is-ancestor">
+          <div className="tile is-parent">
+            <div className="tile is-child box is-success">
+              <div className="block">
+                <UserSelector
+                  users={users}
+                  userId={userId}
+                  setUserId={setUserId}
+                  setSelectedpost={setSelectedpost}
+                />
               </div>
 
-              <PostsList />
+              <div className="block" data-cy="MainContent">
+                {!userId && <p data-cy="NoSelectedUser">No user selected</p>}
+
+                {isLoading && <Loader />}
+
+                {catchError && (
+                  <div
+                    className="notification is-danger"
+                    data-cy="PostsLoadingError"
+                  >
+                    Something went wrong!
+                  </div>
+                )}
+
+                {emptyPosts && posts.length === 0 && userId && (
+                  <div className="notification is-warning" data-cy="NoPostsYet">
+                    No posts yet
+                  </div>
+                )}
+
+                {userId && posts.length > 0 && (
+                  <PostsList
+                    posts={posts}
+                    selectedPost={selectedPost}
+                    setSelectedpost={setSelectedpost}
+                  />
+                )}
+              </div>
             </div>
           </div>
-        </div>
 
-        <div
-          data-cy="Sidebar"
-          className={classNames(
-            'tile',
-            'is-parent',
-            'is-8-desktop',
-            'Sidebar',
-            'Sidebar--open',
-          )}
-        >
-          <div className="tile is-child box is-success ">
-            <PostDetails />
+          <div
+            data-cy="Sidebar"
+            className={classNames(
+              'tile',
+              'is-parent',
+              'is-8-desktop',
+              'Sidebar',
+              { 'Sidebar--open': selectedPost },
+            )}
+          >
+            <div className="tile is-child box is-success ">
+              {selectedPost && (
+                <PostDetails posts={posts} selectedPost={selectedPost} />
+              )}
+            </div>
           </div>
         </div>
       </div>
-    </div>
-  </main>
-);
+    </main>
+  );
+};
diff --git a/src/api/fetch.ts b/src/api/fetch.ts
new file mode 100644
index 000000000..1cb67ca5e
--- /dev/null
+++ b/src/api/fetch.ts
@@ -0,0 +1,11 @@
+import { client } from '../utils/fetchClient';
+
+export const getData = async <T>(url: string) => {
+  try {
+    const data = await client.get<T[]>(url);
+
+    return data;
+  } catch (error) {
+    throw new Error('Unable to load data');
+  }
+};
diff --git a/src/components/NewCommentForm.tsx b/src/components/NewCommentForm.tsx
index 73a8a0b45..e4171f946 100644
--- a/src/components/NewCommentForm.tsx
+++ b/src/components/NewCommentForm.tsx
@@ -1,8 +1,149 @@
-import React from 'react';
+import React, { useState } from 'react';
+import { Comment } from '../types/Comment';
+import { Post } from '../types/Post';
+import { client } from '../utils/fetchClient';
+import classNames from 'classnames';
+
+type ChangeEvent =
+  | React.ChangeEvent<HTMLInputElement>
+  | React.ChangeEvent<HTMLTextAreaElement>;
+
+type InputNames = 'name' | 'mail' | 'comment';
+
+interface Props {
+  setComments: React.Dispatch<React.SetStateAction<Comment[]>>;
+  selectedPost: Post;
+  setLoadingError: React.Dispatch<React.SetStateAction<boolean>>;
+  setShowForm: React.Dispatch<React.SetStateAction<boolean>>;
+}
+
+export const NewCommentForm: React.FC<Props> = ({
+  setComments,
+  selectedPost,
+  setLoadingError,
+  setShowForm,
+}) => {
+  const [userName, setUserName] = useState('');
+  const [userMail, setUserMail] = useState('');
+  const [commentText, setCommentText] = useState('');
+
+  const [isLoading, setIsLoading] = useState(false);
+
+  const [userNameError, setUserNameError] = useState(false);
+  const [userMailError, setUserMailError] = useState(false);
+  const [commentTextError, setCommentTextError] = useState(false);
+
+  const handleFullForm = (e: ChangeEvent, inputName: InputNames) => {
+    switch (inputName) {
+      case 'name': {
+        setUserName(e.target.value);
+        setUserNameError(false);
+        break;
+      }
+
+      case 'mail': {
+        setUserMail(e.target.value);
+        setUserMailError(false);
+        break;
+      }
+
+      case 'comment': {
+        setCommentText(e.target.value);
+        setCommentTextError(false);
+        break;
+      }
+    }
+  };
+
+  const cleanForm = () => {
+    setUserName('');
+    setUserMail('');
+    setCommentText('');
+
+    setUserNameError(false);
+    setUserMailError(false);
+    setCommentTextError(false);
+  };
+
+  const saveInputDataOnSuccess = () => {
+    setUserName(userName);
+    setUserMail(userMail);
+    setCommentText('');
+  };
+
+  const validateInput = (input: string): boolean => {
+    const doesEmpty = input.trim().length > 0;
+
+    return doesEmpty;
+  };
+
+  const addCommetns = async () => {
+    const newData = {
+      postId: selectedPost.id,
+      name: userName,
+      email: userMail,
+      body: commentText,
+    };
+
+    setIsLoading(true);
+
+    try {
+      const newComment: Comment = await client.post('/comments', newData);
+
+      setComments(prevComment => [...prevComment, newComment]);
+
+      saveInputDataOnSuccess();
+    } catch {
+      setLoadingError(true);
+      setComments([]);
+      cleanForm();
+      setShowForm(false);
+    }
+
+    setIsLoading(false);
+  };
+
+  const submit = (e: React.FormEvent<HTMLFormElement>) => {
+    e.preventDefault();
+
+    const inputs = [
+      { value: userName, setError: setUserNameError },
+      { value: userMail, setError: setUserMailError },
+      { value: commentText, setError: setCommentTextError },
+    ];
+
+    const hasEmptyForm =
+      !validateInput(userName) &&
+      !validateInput(userMail) &&
+      !validateInput(commentText);
+
+    if (hasEmptyForm) {
+      setUserNameError(true);
+      setUserMailError(true);
+      setCommentTextError(true);
+
+      return;
+    }
+
+    const isError = inputs.some(input => {
+      if (!validateInput(input.value)) {
+        input.setError(true);
+
+        return true;
+      }
+
+      return false;
+    });
+
+    if (isError) {
+      return;
+    }
+
+    addCommetns();
+  };
 
-export const NewCommentForm: React.FC = () => {
   return (
-    <form data-cy="NewCommentForm">
+    <form data-cy="NewCommentForm" onSubmit={submit}>
       <div className="field" data-cy="NameField">
         <label className="label" htmlFor="comment-author-name">
           Author Name
@@ -14,24 +155,32 @@ export const NewCommentForm: React.FC = () => {
             name="name"
             id="comment-author-name"
             placeholder="Name Surname"
-            className="input is-danger"
+            className={classNames('input', { 'is-danger': userNameError })}
+            value={userName}
+            onChange={e => {
+              handleFullForm(e, 'name');
+            }}
           />
 
           <span className="icon is-small is-left">
             <i className="fas fa-user" />
           </span>
 
-          <span
-            className="icon is-small is-right has-text-danger"
-            data-cy="ErrorIcon"
-          >
-            <i className="fas fa-exclamation-triangle" />
-          </span>
+          {userNameError && (
+            <span
+              className="icon is-small is-right has-text-danger"
+              data-cy="ErrorIcon"
+            >
+              <i className="fas fa-exclamation-triangle" />
+            </span>
+          )}
         </div>
 
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Name is required
-        </p>
+        {userNameError && (
+          <p className="help is-danger" data-cy="ErrorMessage">
+            Name is required
+          </p>
+        )}
       </div>
 
       <div className="field" data-cy="EmailField">
@@ -45,24 +194,32 @@ export const NewCommentForm: React.FC = () => {
             name="email"
             id="comment-author-email"
             placeholder="email@test.com"
-            className="input is-danger"
+            className={classNames('input', { 'is-danger': userMailError })}
+            value={userMail}
+            onChange={e => {
+              handleFullForm(e, 'mail');
+            }}
           />
 
           <span className="icon is-small is-left">
             <i className="fas fa-envelope" />
           </span>
 
-          <span
-            className="icon is-small is-right has-text-danger"
-            data-cy="ErrorIcon"
-          >
-            <i className="fas fa-exclamation-triangle" />
-          </span>
+          {userMailError && (
+            <span
+              className="icon is-small is-right has-text-danger"
+              data-cy="ErrorIcon"
+            >
+              <i className="fas fa-exclamation-triangle" />
+            </span>
+          )}
         </div>
 
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Email is required
-        </p>
+        {userMailError && (
+          <p className="help is-danger" data-cy="ErrorMessage">
+            Email is required
+          </p>
+        )}
       </div>
 
       <div className="field" data-cy="BodyField">
@@ -75,25 +232,42 @@ export const NewCommentForm: React.FC = () => {
             id="comment-body"
             name="body"
             placeholder="Type comment here"
-            className="textarea is-danger"
+            className={classNames('textarea', {
+              'is-danger': commentTextError,
+            })}
+            value={commentText}
+            onChange={e => {
+              handleFullForm(e, 'comment');
+            }}
           />
         </div>
 
-        <p className="help is-danger" data-cy="ErrorMessage">
-          Enter some text
-        </p>
+        {commentTextError && (
+          <p className="help is-danger" data-cy="ErrorMessage">
+            Enter some text
+          </p>
+        )}
       </div>
 
       <div className="field is-grouped">
         <div className="control">
-          <button type="submit" className="button is-link is-loading">
+          <button
+            type="submit"
+            className={classNames('button', 'is-link', {
+              'is-loading': isLoading,
+            })}
+          >
             Add
           </button>
         </div>
 
         <div className="control">
           {/* eslint-disable-next-line react/button-has-type */}
-          <button type="reset" className="button is-link is-light">
+          <button
+            type="reset"
+            className="button is-link is-light"
+            onClick={cleanForm}
+          >
             Clear
           </button>
         </div>
diff --git a/src/components/PostDetails.tsx b/src/components/PostDetails.tsx
index 2f82db916..ab71b584f 100644
--- a/src/components/PostDetails.tsx
+++ b/src/components/PostDetails.tsx
@@ -1,106 +1,165 @@
-import React from 'react';
+import React, { useEffect, useState } from 'react';
 import { Loader } from './Loader';
 import { NewCommentForm } from './NewCommentForm';
+import { getData } from '../api/fetch';
+import { Comment, CommentData } from '../types/Comment';
+import { Post } from '../types/Post';
+import { client } from '../utils/fetchClient';
+
+interface Props {
+  posts: Post[];
+  selectedPost: Post | null;
+}
+
+export const PostDetails: React.FC<Props> = ({ posts, selectedPost }) => {
+  const [comments, setComments] = useState<Comment[]>([]);
+  const [showForm, setShowForm] = useState(false);
+
+  const [loading, setLoading] = useState(false);
+  const [loadingError, setLoadingError] = useState(false);
+
+  useEffect(() => {
+    if (posts && selectedPost) {
+      const fetchComments = async () => {
+        try {
+          const url = `/comments?postId=${selectedPost.id}`;
+
+          setLoading(true);
+
+          if (selectedPost) {
+            setLoadingError(false);
+
+            const currentComments = await getData<Comment>(url);
+
+            setComments(currentComments);
+          }
+        } catch {
+          setLoadingError(true);
+        } finally {
+          setLoading(false);
+        }
+      };
+
+      fetchComments();
+    }
+  }, [posts, selectedPost]);
+
+  useEffect(() => {
+    setShowForm(false);
+  }, [selectedPost]);
+
+  const handleShowForm = () => {
+    setShowForm(true);
+  };
+
+  const handleDelete = async (id: number) => {
+    const updatedCommnets = comments.filter(comment => comment.id !== id);
+
+    setComments(updatedCommnets);
+
+    try {
+      await client.delete(`/comments/${id}`);
+    } catch (error) {
+      const deletedComment = comments.find(comment => comment.id === id);
+
+      if (deletedComment) {
+        setTimeout(() => {
+          setComments([...updatedCommnets, deletedComment]);
+          setLoadingError(true);
+
+          setTimeout(() => {
+            setLoadingError(false);
+          }, 1000);
+        }, 1000);
+      }
+    }
+  };
 
-export const PostDetails: React.FC = () => {
   return (
     <div className="content" data-cy="PostDetails">
       <div className="content" data-cy="PostDetails">
         <div className="block">
-          <h2 data-cy="PostTitle">
-            #18: voluptate et itaque vero tempora molestiae
-          </h2>
-
-          <p data-cy="PostBody">
-            eveniet quo quis laborum totam consequatur non dolor ut et est
-            repudiandae est voluptatem vel debitis et magnam
-          </p>
+          <h2 data-cy="PostTitle">{`#${selectedPost?.id}: ${selectedPost?.title}`}</h2>
+
+          <p data-cy="PostBody">{selectedPost?.body}</p>
         </div>
 
         <div className="block">
-          <Loader />
-
-          <div className="notification is-danger" data-cy="CommentsError">
-            Something went wrong
-          </div>
-
-          <p className="title is-4" data-cy="NoCommentsMessage">
-            No comments yet
-          </p>
-
-          <p className="title is-4">Comments:</p>
-
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a href="mailto:misha@mate.academy" data-cy="CommentAuthor">
-                Misha Hrynko
-              </a>
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
-            </div>
+          {loading && <Loader />}
 
-            <div className="message-body" data-cy="CommentBody">
-              Some comment
+          {loadingError && (
+            <div className="notification is-danger" data-cy="CommentsError">
+              Something went wrong
             </div>
-          </article>
-
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a href="mailto:misha@mate.academy" data-cy="CommentAuthor">
-                Misha Hrynko
-              </a>
-
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
-              >
-                delete button
-              </button>
-            </div>
-            <div className="message-body" data-cy="CommentBody">
-              One more comment
+          )}
+
+          {false && (
+            <div className="notification is-danger" data-cy="CommentsError">
+              Something went wrong
             </div>
-          </article>
-
-          <article className="message is-small" data-cy="Comment">
-            <div className="message-header">
-              <a href="mailto:misha@mate.academy" data-cy="CommentAuthor">
-                Misha Hrynko
-              </a>
-
-              <button
-                data-cy="CommentDelete"
-                type="button"
-                className="delete is-small"
-                aria-label="delete"
+          )}
+
+          {comments.length === 0 && !loading && !loadingError && (
+            <p className="title is-4" data-cy="NoCommentsMessage">
+              No comments yet
+            </p>
+          )}
+
+          {comments.length > 0 && <p className="title is-4">Comments:</p>}
+
+          {comments.map(comment => {
+            const { name, email, body } = comment as CommentData;
+
+            return (
+              <article
+                key={comment.id}
+                className="message is-small"
+                data-cy="Comment"
               >
-                delete button
-              </button>
-            </div>
+                <div className="message-header">
+                  <a href={`mailto:${email}`} data-cy="CommentAuthor">
+                    {name}
+                  </a>
+                  <button
+                    data-cy="CommentDelete"
+                    type="button"
+                    className="delete is-small"
+                    aria-label="delete"
+                    onClick={() => {
+                      handleDelete(comment.id);
+                    }}
+                  >
+                    delete button
+                  </button>
+                </div>
 
-            <div className="message-body" data-cy="CommentBody">
-              {'Multi\nline\ncomment'}
-            </div>
-          </article>
-
-          <button
-            data-cy="WriteCommentButton"
-            type="button"
-            className="button is-link"
-          >
-            Write a comment
-          </button>
+                <div className="message-body" data-cy="CommentBody">
+                  {body}
+                </div>
+              </article>
+            );
+          })}
+
+          {!showForm && !loading && !loadingError && (
+            <button
+              data-cy="WriteCommentButton"
+              type="button"
+              className="button is-link"
+              onClick={handleShowForm}
+            >
+              Write a comment
+            </button>
+          )}
         </div>
 
-        <NewCommentForm />
+        {showForm && (
+          <NewCommentForm
+            setComments={setComments}
+            selectedPost={selectedPost as Post}
+            setLoadingError={setLoadingError}
+            setShowForm={setShowForm}
+          />
+        )}
       </div>
     </div>
   );
diff --git a/src/components/PostsList.tsx b/src/components/PostsList.tsx
index cf90f04b0..c0ddff889 100644
--- a/src/components/PostsList.tsx
+++ b/src/components/PostsList.tsx
@@ -1,86 +1,65 @@
-import React from 'react';
+import { Post } from '../types/Post';
+import classNames from 'classnames';
 
-export const PostsList: React.FC = () => (
-  <div data-cy="PostsList">
-    <p className="title">Posts:</p>
+interface Props {
+  posts: Post[];
+  selectedPost: Post | null;
+  setSelectedpost: React.Dispatch<React.SetStateAction<Post | null>>;
+}
 
-    <table className="table is-fullwidth is-striped is-hoverable is-narrow">
-      <thead>
-        <tr className="has-background-link-light">
-          <th>#</th>
-          <th>Title</th>
-          {/* eslint-disable-next-line jsx-a11y/control-has-associated-label */}
-          <th> </th>
-        </tr>
-      </thead>
+export const PostsList: React.FC<Props> = ({
+  posts,
+  selectedPost,
+  setSelectedpost,
+}) => {
+  const handleButtonSwitch = (currentPost: Post) => {
+    if (selectedPost && selectedPost.id === currentPost.id) {
+      setSelectedpost(null);
+    } else {
+      setSelectedpost(currentPost);
+    }
+  };
 
-      <tbody>
-        <tr data-cy="Post">
-          <td data-cy="PostId">17</td>
+  return (
+    <div data-cy="PostsList">
+      <p className="title">Posts:</p>
 
-          <td data-cy="PostTitle">
-            fugit voluptas sed molestias voluptatem provident
-          </td>
+      <table className="table is-fullwidth is-striped is-hoverable is-narrow">
+        <thead>
+          <tr className="has-background-link-light">
+            <th>#</th>
+            <th>Title</th>
+            {/* eslint-disable-next-line jsx-a11y/control-has-associated-label */}
+            <th> </th>
+          </tr>
+        </thead>
 
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
+        <tbody>
+          {posts.map(post => (
+            <tr data-cy="Post" key={post.id}>
+              <td data-cy="PostId">{post.id}</td>
 
-        <tr data-cy="Post">
-          <td data-cy="PostId">18</td>
+              <td data-cy="PostTitle">{post.title}</td>
 
-          <td data-cy="PostTitle">
-            voluptate et itaque vero tempora molestiae
-          </td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link"
-            >
-              Close
-            </button>
-          </td>
-        </tr>
-
-        <tr data-cy="Post">
-          <td data-cy="PostId">19</td>
-          <td data-cy="PostTitle">adipisci placeat illum aut reiciendis qui</td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
-
-        <tr data-cy="Post">
-          <td data-cy="PostId">20</td>
-          <td data-cy="PostTitle">doloribus ad provident suscipit at</td>
-
-          <td className="has-text-right is-vcentered">
-            <button
-              type="button"
-              data-cy="PostButton"
-              className="button is-link is-light"
-            >
-              Open
-            </button>
-          </td>
-        </tr>
-      </tbody>
-    </table>
-  </div>
-);
+              <td className="has-text-right is-vcentered">
+                <button
+                  type="button"
+                  data-cy="PostButton"
+                  className={classNames('button', 'is-link', {
+                    'is-light':
+                      selectedPost === null || post.id !== selectedPost?.id,
+                  })}
+                  onClick={() => handleButtonSwitch(post)}
+                >
+                  {selectedPost !== null && post.id === selectedPost.id
+                    ? 'Close'
+                    : 'Open'}
+                </button>
+              </td>
+            </tr>
+          ))}
+        </tbody>
+      </table>
+    </div>
+  );
+};
diff --git a/src/components/UserSelector.tsx b/src/components/UserSelector.tsx
index c89442841..d1493e455 100644
--- a/src/components/UserSelector.tsx
+++ b/src/components/UserSelector.tsx
@@ -1,16 +1,56 @@
-import React from 'react';
+import classNames from 'classnames';
+import React, { useRef, useState } from 'react';
+import { User } from '../types/User';
+import { Post } from '../types/Post';
+
+interface Props {
+  users: User[];
+  userId: number | null;
+  setUserId: React.Dispatch<React.SetStateAction<number | null>>;
+  setSelectedpost: React.Dispatch<React.SetStateAction<Post | null>>;
+}
+
+export const UserSelector: React.FC<Props> = ({
+  users,
+  userId,
+  setUserId,
+  setSelectedpost,
+}) => {
+  const [showList, setShowList] = useState(false);
+  const [userName, setUserName] = useState('Choose a user');
+
+  const dropdownRef = useRef<HTMLDivElement | null>(null);
+
+  const handleBlur = (event: React.FocusEvent<HTMLDivElement, Element>) => {
+    if (
+      dropdownRef.current &&
+      !dropdownRef.current.contains(event.relatedTarget)
+    ) {
+      setShowList(false);
+    }
+  };
+
+  const handleToggle = () => {
+    setShowList(!showList);
+  };
 
-export const UserSelector: React.FC = () => {
   return (
-    <div data-cy="UserSelector" className="dropdown is-active">
+    <div
+      data-cy="UserSelector"
+      className={classNames('dropdown', { 'is-active': showList })}
+      ref={dropdownRef}
+      tabIndex={-1}
+      onBlur={handleBlur}
+    >
       <div className="dropdown-trigger">
         <button
           type="button"
           className="button"
           aria-haspopup="true"
           aria-controls="dropdown-menu"
+          onClick={handleToggle}
         >
-          <span>Choose a user</span>
+          <span>{userName}</span>
 
           <span className="icon is-small">
             <i className="fas fa-angle-down" aria-hidden="true" />
@@ -20,21 +60,23 @@ export const UserSelector: React.FC = () => {
 
       <div className="dropdown-menu" id="dropdown-menu" role="menu">
         <div className="dropdown-content">
-          <a href="#user-1" className="dropdown-item">
-            Leanne Graham
-          </a>
-          <a href="#user-2" className="dropdown-item is-active">
-            Ervin Howell
-          </a>
-          <a href="#user-3" className="dropdown-item">
-            Clementine Bauch
-          </a>
-          <a href="#user-4" className="dropdown-item">
-            Patricia Lebsack
-          </a>
-          <a href="#user-5" className="dropdown-item">
-            Chelsey Dietrich
-          </a>
+          {users.map(user => (
+            <a
+              href={`#user-${user.id}`}
+              key={user.id}
+              className={classNames('dropdown-item', {
+                'is-active': user.id === userId,
+              })}
+              onClick={() => {
+                setUserId(user.id);
+                setUserName(user.name);
+                setShowList(false);
+                setSelectedpost(null);
+              }}
+            >
+              {user.name}
+            </a>
+          ))}
         </div>
       </div>
     </div>