Height of textarea does not match the rows in Firefox

Question

The textarea\'s rows attribute does not match the number of lines in Firefox. For instance:

1
2
3
4
this line is         
<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<ins class="adsbygoogle"
     style="display:block"
     data-ad-client="ca-pub-5408099190056760"
     data-ad-slot="7305827575"
     data-ad-format="auto"
     data-full-width-responsive="true"></ins>
<script>
     (adsbygoogle = window.adsbygoogle || []).push({});
</script>        </div>
                      <div class="relativetags">
              相关标签:
       </div>
      </div>
      
      <div class="fly-panel detail-box" id="flyReply">
        <fieldset class="layui-elem-field layui-field-title" style="text-align: center;">
          <legend>4条回答</legend>        </fieldset>

        <ul class="jieda" id="jieda">
                         				            <li data-id="111">
            <a name="item-1111111111"></a>
           
            <div class="detail-about detail-about-reply">
                              <a class="fly-avatar" href="https://www.e-learn.cn/qa/u-102.html">
                <img src="https://www.e-learn.cn/qa/data/avatar/000/00/01/small_000000102.jpg" alt=" ">
              </a>
              <div class="fly-detail-user">
                <a href="https://www.e-learn.cn/qa/u-102.html" class="fly-link">
                  <cite>被撕碎了的回忆 </cite>       
                </a>
              </div>
                            <div class="detail-hits">
                <span>2020-12-05 00:04</span>
              </div>
            </div>
            <div class="detail-body jieda-body photos">
                                                                       
<p>I've had the same problem once and i couldn't use CSS, so JavaScript is the only way: Here's the Mootools and jQuery ways to do this:</p>

<p>Mootools:</p>

<pre><code>window.addEvent('domready', function() {
if (Browser.firefox) {
    $$('textarea[rows]').each(function(el) {
        if (!el.retrieve('ffRowsFixed')) {
            var rows = el.get('rows').toInt();
            if (rows > 1) el.set('rows', (rows - 1));
            el.store('ffRowsFixed', true);
        }
    });
}
});
</code></pre>

<p>jQuery:</p>

<pre><code>$(document).ready(function() {
if ($.browser.mozilla) {
     $('textarea[rows]').each(function(i, el) {
         if (!$(el).data('ffRowsFixed')) {
             var rows = parseInt($(el).attr('rows'));
             if (rows > 1) {
                 $(el).attr('rows', (rows - 1));
             }
             $(el).data('ffRowsFixed', true);
         }
     });
}
});
</code></pre>

<p>It will check if the browser is firefox, if it is, it will check if the rows have been corrected already, and if not they will get fixed.</p>
                                                                        <div class="appendcontent">
                                                        </div>
            </div>
            <div class="jieda-reply">
              <span class="jieda-zan button_agree" type="zan" data-id='829859'>
                <i class="iconfont icon-zan"></i>
                <em>0</em>
              </span>
                 <span type="reply" class="showpinglun" data-id="829859">
                <i class="iconfont icon-svgmoban53"></i>
               讨论(0)
              </span>
              
                                                   
              <div class="jieda-admin">
                                                            </div>
            </div>
                      <div class="comments-mod "  style="display: none; float:none;padding-top:10px;" id="comment_829859">
                    <div class="areabox clearfix">

<form class="layui-form" action="">
               
            <div class="layui-form-item">
    <label class="layui-form-label" style="padding-left:0px;width:60px;">发布评论:</label>
    <div class="layui-input-block" style="margin-left:90px;">
         <input type="text" placeholder="不少于5个字" AUTOCOMPLETE="off" class="comment-input layui-input" name="content" />
                        <input type='hidden' value='0' name='replyauthor' />
    </div>
    <div class="mar-t10"><span class="fr layui-btn layui-btn-sm addhuidapinglun" data-id="829859">提交评论 </span></div>
  </div>
  
</form>
                    </div>
                    <hr>
                    <ul class="my-comments-list nav">
                        <li class="loading">
                        <img src='https://www.e-learn.cn/qa/static/css/default/loading.gif' align='absmiddle' />
                         加载中...
                        </li>
                    </ul>
                </div>
          </li>
          	          <li data-id="111">
            <a name="item-1111111111"></a>
           
            <div class="detail-about detail-about-reply">
                              <a class="fly-avatar" href="https://www.e-learn.cn/qa/u-107.html">
                <img src="https://www.e-learn.cn/qa/data/avatar/000/00/01/small_000000107.jpg" alt=" ">
              </a>
              <div class="fly-detail-user">
                <a href="https://www.e-learn.cn/qa/u-107.html" class="fly-link">
                  <cite>花落未央 </cite>       
                </a>
              </div>
                            <div class="detail-hits">
                <span>2020-12-05 00:16</span>
              </div>
            </div>
            <div class="detail-body jieda-body photos">
                                                                       
<p>You can fix the height by using JavaScript (or hard-code a height of <code>4x1.2 = 4.8em</code>).</p>

<p>Example (JQuery), fix the issue for each textarea:</p>

<pre><code>$("textarea").each(function(){
    var lineHeight = parseFloat($(this).css("line-height"));
    var lines = $(this).attr("rows")*1 || $(this).prop("rows")*1;
    $(this).css("height", lines*lineHeight);
});
</code></pre>

<p>The value of the <code>line-height</code> CSS property equals the height of each line ("row"). So, when you've defined <code>row</code>, this code will fix the height.</p>

<p>When the <code>rows</code> attribute is not set, the code will have a look at the default value (<code>.prop("rows")</code>).</p>
                                                                        <div class="appendcontent">
                                                        </div>
            </div>
            <div class="jieda-reply">
              <span class="jieda-zan button_agree" type="zan" data-id='829858'>
                <i class="iconfont icon-zan"></i>
                <em>0</em>
              </span>
                 <span type="reply" class="showpinglun" data-id="829858">
                <i class="iconfont icon-svgmoban53"></i>
               讨论(0)
              </span>
              
                                                   
              <div class="jieda-admin">
                                                            </div>
            </div>
                      <div class="comments-mod "  style="display: none; float:none;padding-top:10px;" id="comment_829858">
                    <div class="areabox clearfix">

<form class="layui-form" action="">
               
            <div class="layui-form-item">
    <label class="layui-form-label" style="padding-left:0px;width:60px;">发布评论:</label>
    <div class="layui-input-block" style="margin-left:90px;">
         <input type="text" placeholder="不少于5个字" AUTOCOMPLETE="off" class="comment-input layui-input" name="content" />
                        <input type='hidden' value='0' name='replyauthor' />
    </div>
    <div class="mar-t10"><span class="fr layui-btn layui-btn-sm addhuidapinglun" data-id="829858">提交评论 </span></div>
  </div>
  
</form>
                    </div>
                    <hr>
                    <ul class="my-comments-list nav">
                        <li class="loading">
                        <img src='https://www.e-learn.cn/qa/static/css/default/loading.gif' align='absmiddle' />
                         加载中...
                        </li>
                    </ul>
                </div>
          </li>
          	          <li data-id="111">
            <a name="item-1111111111"></a>
           
            <div class="detail-about detail-about-reply">
                              <a class="fly-avatar" href="https://www.e-learn.cn/qa/u-95.html">
                <img src="https://www.e-learn.cn/qa/data/avatar/000/00/00/small_000000095.jpg" alt=" ">
              </a>
              <div class="fly-detail-user">
                <a href="https://www.e-learn.cn/qa/u-95.html" class="fly-link">
                  <cite>迷失自我 </cite>       
                </a>
              </div>
                            <div class="detail-hits">
                <span>2020-12-05 00:25</span>
              </div>
            </div>
            <div class="detail-body jieda-body photos">
                                                                       
<p>Firefox always adds an extra line after the textfield. If you want it to have a constant height, use CSS, e.g.:</p>

<pre><code>textarea {
    height: 5em;
}
</code></pre>

<p>http://jsfiddle.net/Z7zXs/7/</p>

<p><strong>EDIT:</strong>
You can also use the @-moz-document url-prefix CSS extension to target only the Firefox browser. Example</p>

<pre><code>@-moz-document url-prefix() {
    textarea {
        height: 5em;
    }
}
</code></pre>
                                                                        <div class="appendcontent">
                                                        </div>
            </div>
            <div class="jieda-reply">
              <span class="jieda-zan button_agree" type="zan" data-id='829856'>
                <i class="iconfont icon-zan"></i>
                <em>0</em>
              </span>
                 <span type="reply" class="showpinglun" data-id="829856">
                <i class="iconfont icon-svgmoban53"></i>
               讨论(0)
              </span>
              
                                                   
              <div class="jieda-admin">
                                                            </div>
            </div>
                      <div class="comments-mod "  style="display: none; float:none;padding-top:10px;" id="comment_829856">
                    <div class="areabox clearfix">

<form class="layui-form" action="">
               
            <div class="layui-form-item">
    <label class="layui-form-label" style="padding-left:0px;width:60px;">发布评论:</label>
    <div class="layui-input-block" style="margin-left:90px;">
         <input type="text" placeholder="不少于5个字" AUTOCOMPLETE="off" class="comment-input layui-input" name="content" />
                        <input type='hidden' value='0' name='replyauthor' />
    </div>
    <div class="mar-t10"><span class="fr layui-btn layui-btn-sm addhuidapinglun" data-id="829856">提交评论 </span></div>
  </div>
  
</form>
                    </div>
                    <hr>
                    <ul class="my-comments-list nav">
                        <li class="loading">
                        <img src='https://www.e-learn.cn/qa/static/css/default/loading.gif' align='absmiddle' />
                         加载中...
                        </li>
                    </ul>
                </div>
          </li>
          	          <li data-id="111">
            <a name="item-1111111111"></a>
           
            <div class="detail-about detail-about-reply">
                              <a class="fly-avatar" href="https://www.e-learn.cn/qa/u-87.html">
                <img src="https://www.e-learn.cn/qa/data/avatar/000/00/00/small_000000087.jpg" alt=" ">
              </a>
              <div class="fly-detail-user">
                <a href="https://www.e-learn.cn/qa/u-87.html" class="fly-link">
                  <cite>名媛妹妹 </cite>       
                </a>
              </div>
                            <div class="detail-hits">
                <span>2020-12-05 00:26</span>
              </div>
            </div>
            <div class="detail-body jieda-body photos">
                                                                       
<p>There are lot of answers but wasn't suitable for me:</p>

<ul>
<li>CSS rule (<code>height: 5em;</code>) is not flexible enoutgh because it completely overrides <code>rows</code> attribute</li>
<li>And I don'n want to use JavaScript</li>
</ul>

<p>There is a "bug": TEXTAREA incorrectly applying ROWS= and COLS=</p>

<p><strong>So here is my solution:</strong></p>

<p><em>FF adds height to the TextArea to reserve place for scroll-bars.</em></p>

<p>I don't need horizontal scroll bar so it helps with fixing the issue: following css rule can be added to textarea:</p>

<pre><code>overflow-x: hidden;
</code></pre>

<p>Here is example. It works even with <code>rows=1</code>. </p>
                                                                        <div class="appendcontent">
                                                        </div>
            </div>
            <div class="jieda-reply">
              <span class="jieda-zan button_agree" type="zan" data-id='829857'>
                <i class="iconfont icon-zan"></i>
                <em>0</em>
              </span>
                 <span type="reply" class="showpinglun" data-id="829857">
                <i class="iconfont icon-svgmoban53"></i>
               讨论(0)
              </span>
              
                                                   
              <div class="jieda-admin">
                                                            </div>
            </div>
                      <div class="comments-mod "  style="display: none; float:none;padding-top:10px;" id="comment_829857">
                    <div class="areabox clearfix">

<form class="layui-form" action="">
               
            <div class="layui-form-item">
    <label class="layui-form-label" style="padding-left:0px;width:60px;">发布评论:</label>
    <div class="layui-input-block" style="margin-left:90px;">
         <input type="text" placeholder="不少于5个字" AUTOCOMPLETE="off" class="comment-input layui-input" name="content" />
                        <input type='hidden' value='0' name='replyauthor' />
    </div>
    <div class="mar-t10"><span class="fr layui-btn layui-btn-sm addhuidapinglun" data-id="829857">提交评论 </span></div>
  </div>
  
</form>
                    </div>
                    <hr>
                    <ul class="my-comments-list nav">
                        <li class="loading">
                        <img src='https://www.e-learn.cn/qa/static/css/default/loading.gif' align='absmiddle' />
                         加载中...
                        </li>
                    </ul>
                </div>
          </li>
          	          
           <style>
   
.laypage-main a, .laypage-main span {
    display: inline-block;
}
        </style>                  </ul>
        
        <div class="layui-form layui-form-pane">
          <form id="huidaform"  name="answerForm"  method="post">
            
            <div class="layui-form-item layui-form-text">
              <a name="comment"></a>
              <div class="layui-input-block">
            
    
<script type="text/javascript" src="https://www.e-learn.cn/qa/static/js/neweditor/ueditor.config.js"></script>
<script type="text/javascript" src="https://www.e-learn.cn/qa/static/js/neweditor/ueditor.all.js"></script>
<script type="text/plain" id="editor"  name="content"  style="width:100%;height:200px;"></script>                                 
<script type="text/javascript">
                                 var isueditor=1;
            var editor = UE.getEditor('editor',{
                //这里可以选择自己需要的工具按钮名称,此处仅选择如下五个
                toolbars:[['source','fullscreen',  '|', 'undo', 'redo', '|', 'bold', 'italic', 'underline', 'fontborder', 'strikethrough', 'removeformat', 'formatmatch', 'autotypeset', 'blockquote', 'pasteplain', '|', 'forecolor', 'backcolor', 'insertorderedlist', 'insertunorderedlist', 'selectall', 'cleardoc', '|', 'rowspacingtop', 'rowspacingbottom', 'lineheight', '|', 'customstyle', 'paragraph', 'fontfamily', 'fontsize', '|', 'indent', '|', 'justifyleft', 'justifycenter', 'justifyright', 'justifyjustify', '|', 'link', 'unlink', 'anchor', '|', 'simpleupload', 'insertimage', 'scrawl', 'insertvideo', 'attachment', 'map', 'insertcode', '|', 'horizontal', '|', 'preview', 'searchreplace', 'drafts']],
            
                initialContent:'',
                //关闭字数统计
                wordCount:false,
                zIndex:2,
                //关闭elementPath
                elementPathEnabled:false,
                //默认的编辑区域高度
                initialFrameHeight:250
                //更多其他参数，请参考ueditor.config.js中的配置项
                //更多其他参数，请参考ueditor.config.js中的配置项
            });
                        editor.ready(function() {
            	editor.setDisabled();
            	});
                            $("#editor").find("*").css("max-width","362px");
        </script>              </div>
            </div>
                          
    

        
         <div class="layui-form-item">
                <label for="L_vercode" class="layui-form-label">验证码</label>
                <div class="layui-input-inline">
                  <input type="text"  id="code" name="code"   value="" required lay-verify="required" placeholder="图片验证码" autocomplete="off" class="layui-input">
                </div>
                <div class="layui-form-mid">
                  <span style="color: #c00;"><img class="hand" src="https://www.e-learn.cn/qa/user/code.html" onclick="javascript:updatecode();" id="verifycode"><a class="changecode"  href="javascript:updatecode();"> 看不清?</a></span>
                </div>
              </div>
                                  <div class="layui-form-item">
                    <input type="hidden" value="239705" id="ans_qid" name="qid">
   <input type="hidden" id="tokenkey" name="tokenkey" value=''/>
                <input type="hidden" value="Height of textarea does not match the rows in Firefox" id="ans_title" name="title"> 
             
              <div class="layui-btn    layui-btn-disabled"  id="ajaxsubmitasnwer" >提交回复</div>
            </div>
          </form>
        </div>
      </div>
      <input type="hidden" value="239705" id="adopt_qid"	name="qid" /> 
      <input type="hidden" id="adopt_answer" value="0"	name="aid" />
    </div>
    <div class="layui-col-md4">
          
 <!-- 热门讨论问题 -->
     
 <dl class="fly-panel fly-list-one">
        <dt class="fly-panel-title">热议问题</dt>
            <!-- 本周热门讨论问题显示10条-->