te')); return $arr; } /* 遍历用户所有主题 * @param $uid 用户ID * @param int $page 页数 * @param int $pagesize 每页记录条数 * @param bool $desc 排序方式 TRUE降序 FALSE升序 * @param string $key 返回的数组用那一列的值作为 key * @param array $col 查询哪些列 */ function thread_tid_find_by_uid($uid, $page = 1, $pagesize = 1000, $desc = TRUE, $key = 'tid', $col = array()) { if (empty($uid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('uid' => $uid), array('tid' => $orderby), $page, $pagesize, $key, $col); return $arr; } // 遍历栏目下tid 支持数组 $fid = array(1,2,3) function thread_tid_find_by_fid($fid, $page = 1, $pagesize = 1000, $desc = TRUE) { if (empty($fid)) return array(); $orderby = TRUE == $desc ? -1 : 1; $arr = thread_tid__find($cond = array('fid' => $fid), array('tid' => $orderby), $page, $pagesize, 'tid', array('tid', 'verify_date')); return $arr; } function thread_tid_delete($tid) { if (empty($tid)) return FALSE; $r = thread_tid__delete(array('tid' => $tid)); return $r; } function thread_tid_count() { $n = thread_tid__count(); return $n; } // 统计用户主题数 大数量下严谨使用非主键统计 function thread_uid_count($uid) { $n = thread_tid__count(array('uid' => $uid)); return $n; } // 统计栏目主题数 大数量下严谨使用非主键统计 function thread_fid_count($fid) { $n = thread_tid__count(array('fid' => $fid)); return $n; } ?>javascript - enable or disable option from select - Stack Overflow

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    javascript - enable or disable option from select - Stack Overflow

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    I am trying to make an option either selectable OR non-selectable based on whether or not they chose another option. For example, if there is options 1-6 and they have NOT chosen option 1 in their first select box, then in that SAME select box and any other in the form, then option 6 could NOT be chosen.

    I looked around, but everything is about clicking a button to achieve this.

    This is the code I have (I have also tried onclick)

       <script type="text/javascript">
      function makeDisable(){
      var x=document.getElementById("mySelect2");
      x.disabled=true
      }
     function makeEnable(){
         var x=document.getElementById("mySelect2");
          x.disabled=false
     }</script>
     <form>
        <select class="mySelect" id="mySelect">
        <option onchange="makeEnable()" value="Enable list">Apple</option>
        <option onchange="makeDisable()" value="Disable list">Banana</option>
        <option id="mySelect2" disabled="true">Orange</option>
    </select>
    </form>

    I am trying to make an option either selectable OR non-selectable based on whether or not they chose another option. For example, if there is options 1-6 and they have NOT chosen option 1 in their first select box, then in that SAME select box and any other in the form, then option 6 could NOT be chosen.

    I looked around, but everything is about clicking a button to achieve this.

    This is the code I have (I have also tried onclick)

       <script type="text/javascript">
      function makeDisable(){
      var x=document.getElementById("mySelect2");
      x.disabled=true
      }
     function makeEnable(){
         var x=document.getElementById("mySelect2");
          x.disabled=false
     }</script>
     <form>
        <select class="mySelect" id="mySelect">
        <option onchange="makeEnable()" value="Enable list">Apple</option>
        <option onchange="makeDisable()" value="Disable list">Banana</option>
        <option id="mySelect2" disabled="true">Orange</option>
    </select>
    </form>
    • javascript
    • html-select
    Share Improve this question edited Jan 16, 2017 at 17:23 Kara 6,22616 gold badges53 silver badges58 bronze badges asked Jul 31, 2013 at 14:30 M.SidimM.Sidim 3033 gold badges5 silver badges15 bronze badges
    Add a ment  | 

    1 Answer 1

    Reset to default 8

    Option elements don't have event "onchange", but Select elements do.

    I've quickly wrote a code snippet below. You may add more select items. When you choose an option in one of those select elements, you shouldn't choose options at same index in other select elements.

    function toggleDisability(selectElement) {
  //Getting all select elements
  var arraySelects = document.getElementsByClassName('mySelect');
  //Getting selected index
  var selectedOption = selectElement.selectedIndex;
  //Disabling options at same index in other select elements
  for (var i = 0; i < arraySelects.length; i++) {
    if (arraySelects[i] == selectElement)
      continue; //Passing the selected Select Element

    arraySelects[i].options[selectedOption].disabled = true;
  }
}
    <form>
  <select onchange="toggleDisability(this);" class="mySelect" id="mySelect1">
    <option>Apple</option>
    <option>Banana</option>
    <option>Orange</option>
  </select>
  <select onchange="toggleDisability(this);" class="mySelect" id="mySelect2">
    <option>Hamburger</option>
    <option>Pizza</option>
    <option>Cola</option>
  </select>
</form>

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