app/views/posts/new.html.erb
<!DOCTYPE html>
<html>
<body>
<div id='post-spacer'>
</div>
<div class="card">
<div id='new-post-header'>
<% if params[:wall_id] != nil %>
<%= User.find(params[:wall_id]).email %>'s Wall
<% else %>
NEW POST
<% end %>
</div>
</div>
<div id='post-spacer'>
</div>
<div id='new-post-form'>
<%= form_for @post do |form| %>
<div id='form-header'>
<%= form.label :message %>
</div>
<div class="card">
<div id='form-text-area'>
<%= form.text_area :message, :maxlength => 500, :size => 40, :id => "area" %>
</div>
<%= form.label :image %>
<%= form.file_field :image %>
<%= form.hidden_field :wall_id, value: params[:wall_id] %>
<div id='form-submit-btn'>
<%= form.submit "Submit" %>
</div>
</div>
<% end %>
<script>
var area = document.getElementById("area");
document.getElementById("new_post").addEventListener('keydown', function (event) {
if (event.keyCode === 13 && event.target !== area) {
event.preventDefault();
}
});
</script>
</body>
</html>