Question

有人能举例说明如何禁用下拉列表吗？我想要的是当用户选择Coach and Mentoring或Others时，第二个和第三个下拉列表将被禁用。谢谢你的帮助。

 <tr>
		<td>Action</td>
		<td><select name = "TTID1" id="TTID1" style="width:250px" onchange="otherAction(this.value)">
		<option value="O"></option>
    	<option value="600">Classroom Training</option>
  		<option value="601">Coaches and Mentoring by IM</option>
  		<option value="602">On Job Training</option>
		<option value="9999">Others</option>
		</select></td>
		
		<td>Proposed Training in ILSAS</td>
		<td><select name = "trainGroup1" id="trainGroup1" style="width:250px" onchange="otherIlsas(this.value)">
		<option value="O"></option>
    	<option value="700">Power Engineering & Energy Training</option>
  		<option value="701">Management Training</option>
  		<option value="702">IT & Corporate System Training</option>
		<option value="703">Business Operation Tools Certification</option>
		<option value="9999">Others</option>
		</select></td>
		
	</tr>
	<tr>
		<td>Course</td>
		<td><?php 
		
		$qry="SELECT trainID, trainText FROM tbltraininglist order by traintext asc";
		$result=mysql_query($qry);
		
		echo "<select name = 'trainID1' id='trainID1' style='width:250px' )'>";
		echo "<option value ='null'></option>";
		while ($row = mysql_fetch_array($result)) {
		
  		
  		?>
			<option value="<?php echo $row['trainID'];  ?>"><?php echo $row['trainText']; ?> </option>
			<?php
  		}	
		
		?>
		</select></td>

Answer 1

<script type="text/javascript">
$(document).ready(function() {
     $('#TTID1').change(function() {
         if($(this).val() == "601" || $(this).val() == "9999")
         {
             $('#trainGroup1').prop('disabled', true);
         }
         else
         {
             $('#trainGroup1').prop('disabled', false);
         }
     });
 });
</script>

这是使用onchange事件的超级基本答案。使其更具动态性并调整它以正确重置您的选择字段我将留给您自定义。：）

Answer 2

尝试以下简单示例：

$('#TTID1').on('change', function(){
    
    if ( $(this).val() == 601 || $(this).val() == 9999 ) {
        
        $('#trainGroup1 option[value="700"], #trainGroup1 option[value="701"]').prop('disabled', true);
    } else {
        $('#trainGroup1').find('option').prop('disabled', false);
    }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<tr>
		<td>Action</td>
		<td><select name = "TTID1" id="TTID1" style="width:250px">
		<option value="O"></option>
    	<option value="600">Classroom Training</option>
  		<option value="601">Coaches and Mentoring by IM</option>
  		<option value="602">On Job Training</option>
		<option value="9999">Others</option>
		</select></td>
		
		<td>Proposed Training in ILSAS</td>
		<td><select name = "trainGroup1" id="trainGroup1" style="width:250px">
		<option value="O"></option>
    	<option value="700">Power Engineering & Energy Training</option>
  		<option value="701">Management Training</option>
  		<option value="702">IT & Corporate System Training</option>
		<option value="703">Business Operation Tools Certification</option>
		<option value="9999">Others</option>
		</select></td>

根据jquery中的第一个下拉列表禁用下拉列表

2 个答案: