权限没有，则隐藏 function forum_list_access_filter($forumlist, $gid, $allow = 'allowread') { global $grouplist; if (empty($forumlist)) return array(); if (1 == $gid) return $forumlist; $forumlist_filter = $forumlist; $group = $grouplist[$gid]; foreach ($forumlist_filter as $fid => $forum) { if (empty($forum['accesson']) && empty($group[$allow]) || !empty($forum['accesson']) && empty($forum['accesslist'][$gid][$allow])) { unset($forumlist_filter[$fid]); } unset($forumlist_filter[$fid]['accesslist']); } return $forumlist_filter; } function forum_filter_moduid($moduids) { $moduids = trim($moduids); if (empty($moduids)) return ''; $arr = explode(',', $moduids); $r = array(); foreach ($arr as $_uid) { $_uid = intval($_uid); $_user = user_read($_uid); if (empty($_user)) continue; if ($_user['gid'] > 4) continue; $r[] = $_uid; } return implode(',', $r); } function forum_safe_info($forum) { //unset($forum['moduids']); return $forum; } function forum_filter($forumlist) { foreach ($forumlist as &$val) { unset($val['brief'], $val['announcement'], $val['seo_title'], $val['seo_keywords'], $val['create_date_fmt'], $val['icon_url'], $val['modlist']); } return $forumlist; } function forum_format_url($forum) { global $conf; if (0 == $forum['category']) { // 列表URL $url = url('list-' . $forum['fid'], '', FALSE); } elseif (1 == $forum['category']) { // 频道 $url = url('category-' . $forum['fid'], '', FALSE); } elseif (2 == $forum['category']) { // 单页 $url = url('read-' . trim($forum['brief']), '', FALSE); } if ($conf['url_rewrite_on'] > 1 && $forum['well_alias']) { if (0 == $forum['category'] || 1 == $forum['category']) { $url = url($forum['well_alias'], '', FALSE); } elseif (2 == $forum['category']) { // 单页 $url = ($forum['threads'] && $forum['brief']) ? url($forum['well_alias'] . '-' . trim($forum['brief']), '', FALSE) : url($forum['well_alias'], '', FALSE); } } return $url; } function well_forum_alias() { $forumlist = forum_list_cache(); if (empty($forumlist)) return ''; $key = 'forum-alias'; static $cache = array(); if (isset($cache[$key])) return $cache[$key]; $cache[$key] = array(); foreach ($forumlist as $val) { if ($val['well_alias']) $cache[$key][$val['fid']] = $val['well_alias']; } return array_flip($cache[$key]); } function well_forum_alias_cache() { global $conf; $key = 'forum-alias-cache'; static $cache = array(); // 用静态变量只能在当前 request 生命周期缓存，跨进程需要再加一层缓存：redis/memcached/xcache/apc if (isset($cache[$key])) return $cache[$key]; if ('mysql' == $conf['cache']['type']) { $arr = well_forum_alias(); } else { $arr = cache_get($key); if (NULL === $arr) { $arr = well_forum_alias(); !empty($arr) AND cache_set($key, $arr); } } $cache[$key] = empty($arr) ? '' : $arr; return $cache[$key]; } ?>javascript - RJS error: TypeError: element is null - Stack Overflow

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    你的位置： 首页>programmer>javascript - RJS error: TypeError: element is null - Stack Overflow

    javascript - RJS error: TypeError: element is null - Stack Overflow

    programmeradmin7浏览0评论

    I got RJS error: TypeError: element is null while using ajax.

    I used in view

    <%= periodically_call_remote(:url=>{:action=>'get_user_list', :id=>'1'},
:frequency => '5') %>

    in controller

      render :update do |page|
    page.replace_html  'chat_area', :partial => 'chat_area', :object => [@chats, @user]     if @js_update
  end

    in partial chat_area

    <% if [email protected]? && !show_div(@chats).blank?%>
    <% show_div_id=show_div(@chats) %>
  <% for chat in @chats %>
      <div class="popup" id="chat_area_<%= chat.id %>"
style="display:<%= (chat.id == show_div_id)? 'block' : 'none' %>;">

        <% form_remote_for(:chat, :url => {:controller=>'chats',
:action=>'create', :id=>1}, :html=>{:name => "form_#{chat.id}"},
:plete=>"resetContent('#{chat.id}');") do |f| %>
        <div style="display:none;">
            <%= f.hidden_field :sessionNo, :value=>chat.sessionNo %>
            <%= f.text_area :chatContent,  :id=>
"chatContent_field_#{chat.id}", :cols=>"100", :rows=>"6",
:onKeyPress=>"return submitenter(this,event);" %>
          </div>
            <input type="image" src="images/chat/send-hover.png"
value="Send" onclick="return submit_button('<%= chat.id %>')"/>
        <% end %>
      </div>

    </div>
  <% end %>

<% else %>
      <div class="popup" id="chat_area_none" style="display:'block';">
          <input type="image" disabled ="disabled"
src="images/chat/send.png" style="cursor:default;" value="Send" />
      </div>
<% end %>

    My div present in index.html.erb

          <table border="0" width="100%" cellspacing="0" cellpadding="0">
        <tbody><tr>
            <td align="left" width="80%" valign="top" style="">
              <%= text_area :chat, :chatContent,  :id=> "chatContent_field", :cols=>"100", :rows=>"6" %>
            </td>
            <td align="left" width="20%" valign="bottom" style="padding-left:10px;padding-left:10px;x" >
              <div id="chat_area">
                 <%= render :partial => 'chat_area' %>
              </div>
            </td>
          </tr>
        </tbody>
      </table>

    Any help is appreciated.

    Regards,

    Salil Gaikwad

    I got RJS error: TypeError: element is null while using ajax.

    I used in view

    <%= periodically_call_remote(:url=>{:action=>'get_user_list', :id=>'1'},
:frequency => '5') %>

    in controller

      render :update do |page|
    page.replace_html  'chat_area', :partial => 'chat_area', :object => [@chats, @user]     if @js_update
  end

    in partial chat_area

    <% if [email protected]? && !show_div(@chats).blank?%>
    <% show_div_id=show_div(@chats) %>
  <% for chat in @chats %>
      <div class="popup" id="chat_area_<%= chat.id %>"
style="display:<%= (chat.id == show_div_id)? 'block' : 'none' %>;">

        <% form_remote_for(:chat, :url => {:controller=>'chats',
:action=>'create', :id=>1}, :html=>{:name => "form_#{chat.id}"},
:plete=>"resetContent('#{chat.id}');") do |f| %>
        <div style="display:none;">
            <%= f.hidden_field :sessionNo, :value=>chat.sessionNo %>
            <%= f.text_area :chatContent,  :id=>
"chatContent_field_#{chat.id}", :cols=>"100", :rows=>"6",
:onKeyPress=>"return submitenter(this,event);" %>
          </div>
            <input type="image" src="images/chat/send-hover.png"
value="Send" onclick="return submit_button('<%= chat.id %>')"/>
        <% end %>
      </div>

    </div>
  <% end %>

<% else %>
      <div class="popup" id="chat_area_none" style="display:'block';">
          <input type="image" disabled ="disabled"
src="images/chat/send.png" style="cursor:default;" value="Send" />
      </div>
<% end %>

    My div present in index.html.erb

          <table border="0" width="100%" cellspacing="0" cellpadding="0">
        <tbody><tr>
            <td align="left" width="80%" valign="top" style="">
              <%= text_area :chat, :chatContent,  :id=> "chatContent_field", :cols=>"100", :rows=>"6" %>
            </td>
            <td align="left" width="20%" valign="bottom" style="padding-left:10px;padding-left:10px;x" >
              <div id="chat_area">
                 <%= render :partial => 'chat_area' %>
              </div>
            </td>
          </tr>
        </tbody>
      </table>

    Any help is appreciated.

    Regards,

    Salil Gaikwad

    • javascript
    • ruby-on-rails
    • ajax
    • rjs
    Share Improve this question edited Mar 19, 2010 at 5:03 Jordan Running 106k18 gold badges188 silver badges187 bronze badges asked Mar 19, 2010 at 4:48 SalilSalil 47.5k22 gold badges125 silver badges160 bronze badges 1
    • Element is null means that there is DOM element on the page that the returned javascript is trying to access that cannot be found. I cannot see the issue immediately, but that is what the error means. – Apie Commented Mar 19, 2010 at 6:22
    Add a ment  | 

    2 Answers 2

    Reset to default 4

    I find it out why it happens because I didn't close div above the "chat_area" properly. the only thing i did isclose the div and it works like a magic, neways thanks to all

    Reagrds,

    Salil Gaikwad

    This means that RJS is attempting to manipulate something in html output that doesn't exist.

    It looks like the problem is that you want to update your user_list but nothing with that id exists in your html. Make sure you are rendering that, also make sure you have the update attribute in your periodically_call_remote method set to the id of the element you want to update.

    periodically_call_remote(:url => { :action => 'get_user_list' }, :update => 'get_user_list')

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