万一长度过大，阻止提交

app/views/memos/edit.html.erb

@@ -1,11 +1,16 @@
 <%= javascript_include_tag 'new_user'%>
 <script>
-  $(function(){
+
-      limitStrsize('memo_subject',50);
-      limitStrsize('memo_content',5000);
-  });
   function check_and_submit(){
       if($("textarea[name='memo[subject]']").val().trim() != "" && $("textarea[name='memo[content]']").val().trim() != "" ){
+          if($("textarea[name='memo[subject]']").val().trim().length > 50 ){
+              $("#error").html('主题不能超过50个字符').show();
+              return;
+          }
+          if($("textarea[name='memo[content]']").val().trim().length > 5000 ){
+              $("#error").html('内容不能超过5000个字符').show();
+              return;
+          }
           $("#edit_memo").submit();
       }else if($("textarea[name='memo[subject]']").val().trim() == "" && $("textarea[name='memo[content]']").val().trim() != "" ){
           $("#error").html("主题不能为空").show();
@@ -19,7 +24,7 @@
 </div>
 <div class="postRightContainer" style="margin-top: 15px">
   <%= labelled_form_for(@memo, :url => forum_memo_path(@memo.forum_id, @memo),:html=>{:id=>'edit_memo'}) do |f|  %>
-      <div id="error" style="display: none">
+      <div id="error" style="color:red ;display: none">
 
       </div>
   <div>
@@ -44,4 +49,10 @@
     <div class="cl"></div>
   </div>
   <% end %>
-</div>
+</div>
+<script>
+    $(function(){
+        limitStrsize('memo_subject',50);
+        limitStrsize('memo_content',5000);
+    });
+</script>