小编use*_*816的帖子

我使用bootstrap制作了一个下拉列表.动态地我要禁用并启用下拉列表.

HTML代码:

  <div class="span3 offset1">
        <select name="primary" class="select-block" id="select_alert" style="display: none;">
            <option "selected"="">Choose Alert T</option>                         


    <option value="T1">T1</option>

    <option value="T2">T2</option>

    <option value="T3">T3</option>

    <option value="T4">T4</option>

</select>
<div class="btn-group select select-block">
  <i class="dropdown-arrow dropdown-arrow-primary"></i>
  <button class="btn dropdown-toggle clearfix btn-primary" data-toggle="dropdown" id="select_alert">
    <span class="filter-option pull-left">Choose Alert T</span>&nbsp;
    <span class="caret"></span>
  </button>
  <ul class="dropdown-menu dropdown-primary" role="menu">
    <li rel="0" class="selected">
      <a tabindex="-1" href="#" class="">
        <span class="pull-left">Choose Alert T</span>
      </a>
    </li>
    <li rel="1">
      <a tabindex="-1" href="#" class="">
        <span class="pull-left">T1</span>
      </a>
    </li>
    <li rel="2">
      <a tabindex="-1" href="#" class="">
        <span …

我使用<input>tag 创建了textfield.如果在textfield中输入任何字符.我想在控制台中打印该角色.

我在谷歌搜索,每个人都建议jQuery.I我正在学习Javascript所以没有完成Javascipt课程我不想切换jQuery.