socialforge/app/views/admin/messages.html.erb

<%= javascript_include_tag "/assets/kindeditor/kindeditor",'/assets/kindeditor/pasteimg'  %>
<h3 style="float: left">
  <%=l(:label_system_message)%>
</h3><br/>
<div style="padding-top: 20px; padding-left: 5px;">
  <%= form_for(@admin_messages, :html => {:id =>'system_message-form'}) do |f| %>
      <div class="field">
        <%= f.kindeditor :content,:width=>'87%',:editor_id=>'system_message_editor' %>
        <p id="content_notice_span" class="ml55"></p>
      </div>
      <div>
        <p id="content_notice_span" class="ml55"></p>
      </div>
      <div class="actions">
        <%= link_to l(:label_submit), "javascript:void(0)",:class => "small", :onclick => "system_message_editor.sync();submit_message();" %>
      </div>
  <% end %>
</div>
<script>
    function system_message_length() {
        var obj = system_message_editor.html();
        if (obj.length == 0) {
            $("#content_notice_span").text("内容不能为空");
            $("#content_notice_span").css('color', '#ff0000');
            $("#content_notice_span").focus();
            return false;
        }
        else if (obj.length > 255) {
            $("#content_notice_span").text("内容过长，超过255个字符");
            $("#content_notice_span").css('color', '#ff0000');
            $("#content_notice_span").focus();
            return false;
        }
        else {
            $("#content_notice_span").text("填写正确");
            $("#content_notice_span").css('color', '#008000');
            return true;
        }
    }
    function submit_message() {

        if (system_message_length()) {
            $("#system_message-form").submit();
        }
    }
</script>