jQuery 代码在选中复选框时有效,但在未选中时无效

jQuery code works when a checkbox is selected but doesn't work when unchecked

我有一个 jQuery 函数,可以在选中时更改 <div> 的颜色。如果不选中,则没有背景。当它被检查时,它应该是黑色的。选中时有效,取消选中时无效。

这是我目前所做的:

$(document).on('change', '#two_img_left_feature_img label.selected input', function () {
    if ($("#two_img_left_feature_img label.selected input").is(":checked")) {
        $('#two_img_left_feature_img').css('background','black');
    } else {
        $('#two_img_left_feature_img').css('background','white');
    }
});

HTML很简单:

<div id="two_img_left_feature_img">
     <input type="checkbox" id="acf-block_60173d68d2c6a-field_5f8cf27e7c048-two_img_left_set_featured_img" name="acf-block_60173d68d2c6a[field_5f8cf27e7c048][]" value="two_img_left_set_featured_img">
</div>

问题是关于 label.selected...当复选框未选中时,我猜标签没有 .selected class.

因此只需从事件处理程序选择器和条件中删除 label.selected。太具体了...

$(document).on("click", "#two_img_left_feature_img input", function () {
  if ($("#two_img_left_feature_img input").is(":checked")) {
    $("#two_img_left_feature_img").css("background", "black");
  } else {
    $("#two_img_left_feature_img").css("background", "white");
  }
});
#two_img_left_feature_img {
  height: 200px;
  width: 200px;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="two_img_left_feature_img">
  <label>
    <input type="checkbox" id="acf-block_60173d68d2c6a-field_5f8cf27e7c048-two_img_left_set_featured_img" name="acf-block_60173d68d2c6a[field_5f8cf27e7c048][]" value="two_img_left_set_featured_img">
  </label>
</div>