如何在选择其他下拉菜单时启用或禁用下拉菜单或文本框?

问题描述：

<script>
$('#Select_Font').attr('disabled', 'true');
$('#Enter_Text').attr('disabled', 'true');
$('.dropdownstyle').change(function(){
    $(".dropdownstyle option:selected").text();
    if($(this).attr('value').match(/Custom$/)) 
    {
        $('#Select_Font').attr('disabled', 'false');
        $('#Enter_Text').attr('disabled', 'false');
    } else if($(this).attr('value').match(/no Thanks$/)) 
    {
        $('#Select_Font').attr('disabled', 'true');
        $('#Enter_Text').attr('disabled', 'true');
    }
});
</script>


<table>
<tbody>
<tr>
<td>
<span>Select type</span>
</td>
<td>
<select class="dropdownstyle">
    <option value="No Thanks">No Thanks</option>
    <option value="Custom lid (200)">Custom lid (200)</option>
</select>
</td>
</tr>
<tr>
<td>
<span>Select font</span>
</td>
<td>
<select id="Select_Font"> 
    <option value="Arial">Arial</option> 
    <option value="georgia">georgia</option> 
</select>
</td>
</tr>
<tr>
<td>
<span>enter text</span>
</td>
<td>
<input type="text" id="Enter_Text">
</td>
</tr>
</tbody>
</table>

在上面的代码中，最初我希望禁用字体下拉菜单和文本框，但是在选择自定义窗体的第一个下拉菜单时，我希望启用字体下拉菜单和文本框. 我不确定哪里出了问题，应该怎么做才能使其正常工作.

In above code initially I want font drop-down and text-box disable but on select of custom form first drop-down I want font drop-down and text box to be enable. I am not sure where I am going wrong, so what should be done to make it work.

答

尝试: 示例

Try: SAMPLE

$('#Select_Font, #Enter_Text').attr('disabled', 'disabled');
$('.dropdownstyle').change(function () {
    var present = $(this).val().match(/\Custom\b/gi) == null ? true : false;
    if(present){
        $('#Select_Font, #Enter_Text').prop('disabled', 'disabled');
    }
    else{
        $('#Select_Font, #Enter_Text').removeAttr('disabled');
    }
});

$(this).attr('value')将返回undefined.您应该使用$(this).val()

$(this).attr('value') will return undefined. You should use $(this).val()

如何在选择其他下拉菜单时启用或禁用下拉菜单或文本框?

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