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I am fairly new to javascript programming and just can't seem to get this right even after going through the questions here, basically i have a checkbox which displays two radio buttons only when it is unselected

<span><strong>Not Available</strong></span>
<input  type="checkbox" placeHolder="" id="available" style="" name="available" required value="Yes"/>
<span style=" visibility: hidden; " id="BACSSpan">BACS</span><input type="radio" id="BACS" name="paymentSpecified" value="BACS" style="visibility: hidden;">
<span style="visibility: hidden;" id="ChequeSpan">Cheque</span> <input type="radio" id="Cheque" name="paymentSpecified"  value="Cheque" style=visibility: hidden;">

I have used the following javascript:

$('body').on('click', '#available', function ()
  {
    if ($('#available:checked'))
    {
      $('#BACSSpan').css('visibility','hidden');
      $('#BACS').css('visibility','hidden');
      $('#ChequeSpan').css('visibility','hidden');
      $('#Cheque').css('visibility','hidden');
    } else 
    {
      $('#BACSSpan').css('visibility','visible');
      $('#BACS').css('visibility','visible');
      $('#ChequeSpan').css('visibility','visible');
      $('#Cheque').css('visibility','visible');
    }
  })

What it should do is alternate between showing the two radio buttons, but it is not doing anything, but when i reverse the order of the condition i.e opposite of what i want; then the required functionality happens once only

4

2 回答 2

3

问题是这$('#available:checked')是一个 jQuery 对象 - 不是布尔值。要获得布尔值，您应该这样做：

if ($(this).is(':checked')) {
    ...
}
else {
    ...
}
于 2013-08-20T11:22:20.067 回答
1

如果您不想大量更改代码，只需添加.length.

if ($('#available:checked').length) {
    //Do Something
}
于 2013-08-20T11:32:28.387 回答