AutoCompleteAccount.apxc

public class AutoCompleteAccount {
  
  public String selectedAccountId {get;set;}
  public boolean accountDetailVisible{get;set;}
  public Account selectedAccount{get;set;}
  public String chatterPost{get;set;}
  
  /*
  * This method get called from action function when some selects the Account from auto complete. Along with this method
  * selectedAccountId variable also get updated for accessing the Id. 
  */   
  public void showAccountDetail(){
      selectedAccount = [Select Id,Name,Website,AccountNumber,Phone ,Fax FROM Account WHERE Id = :selectedAccountId LIMIT 1];
      accountDetailVisible= true;
  }
  
  /*
  * This method is called on "Post" button click in "Add Chatter Post" Section. In this we are creating FeedItem object
  * and assigning parentId as the selectedAccountId and body as the entered text in chatterPost.
  */
  public void postChatterMessage(){
      if(chatterPost == null || chatterPost.trim().equals('')){
          ApexPages.addMessage(new ApexPages.message(ApexPages.Severity.ERROR,'Please Enter chatter Message to Post.'));
      }else{
          FeedItem feed = new FeedItem();
          feed.ParentId = selectedAccountId;
          feed.Body = chatterPost;
          insert feed;
          ApexPages.addMessage(new ApexPages.message(ApexPages.Severity.INFO,'Your Message has been posted on Chatter'));
          chatterPost = '';
      }
  }
    
}