javascript - jQuery 选择复选框 - 全选

Question

我有以下 list 和任务结构

现在我想如果有人检查一个任务，我想确保检查 list 也得到检查。当有人取消选中 list 时，所有任务都应该取消选中。

<!-- Checklist -->
              <div class="checklist">
                <div class="media">
                  <div class="pull-left checklist-checkbox">
                    <input class="checklist-input" name="checklist" type="checkbox" value="">
                  </div>
                  <div class="media-body task-list">
                    <h4 class="media-heading">This is a CheckList</h4>
                    <div class="media tasks">
                      <div class="pull-left task-checkbox">
                        <input class="task-input" name="task" type="checkbox" value="">
                      </div>
                      <div class="media-body">Search for entertainers that perform the types of shows that are suitable for your function.</div>
                    </div>
                    <div class="media tasks">
                      <div class="pull-left task-checkbox">
                        <input class="task-input" name="task" type="checkbox" value="">
                      </div>
                      <div class="media-body"> Book your venue.</div>
                    </div>
                    <div class="media tasks">
                      <div class="pull-left task-checkbox">
                        <input class="task-input" name="task" type="checkbox" value="">
                      </div>
                      <div class="media-body"> Search for a caterer that is suitable for your function. <span class="label label-default">Lalu - June 23rd, 2014</span></div>
                    </div>
                    <div class="media tasks">
                      <div class="pull-left task-checkbox">
                        <input class="task-input" name="task" type="checkbox" value="">
                      </div>
                      <div class="media-body"> Hold a training session for all attending staff and brief them on all activities and expectations for the day of the event.</div>
                    </div>
                    <div class="media tasks">
                      <div class="pull-left task-checkbox">
                        <input class="task-input" name="task" type="checkbox" value="">
                      </div>
                      <div class="media-body"> Appoint an adequate number of staff as greeters to welcome guests and orient them with the event activities and venue.</div>
                    </div>
                    <div class="add-task"><a href="#">Add Task</a></div>
                    <div class="form-add-task">
                      <form action="addtask.php" method="post">
                        <input type="text" class="form-control task-input">
                        <input class="btn btn-sm btn-default" name="submit-task" type="submit" value="Add Task">
                      </form>
                    </div>
                  </div>
                </div>
              </div>
              <div class="checklist">
                <div class="media">
                  <div class="pull-left checklist-checkbox">
                    <input class="checklist-input" name="checklist" type="checkbox" value="">
                  </div>
                  <div class="media-body task-list">
                    <h4 class="media-heading">This is a CheckList</h4>
                    <div class="media tasks">
                      <div class="pull-left task-checkbox">
                        <input class="task-input" name="task" type="checkbox" value="">
                      </div>
                      <div class="media-body">Search for entertainers that perform the types of shows that are suitable for your function.</div>
                    </div>
                    <div class="media tasks">
                      <div class="pull-left task-checkbox">
                        <input class="task-input" name="task" type="checkbox" value="">
                      </div>
                      <div class="media-body"> Book your venue.</div>
                    </div>
                    <div class="media tasks">
                      <div class="pull-left task-checkbox">
                        <input class="task-input" name="task" type="checkbox" value="">
                      </div>
                      <div class="media-body"> Search for a caterer that is suitable for your function. <span class="label label-default">Lalu - June 23rd, 2014</span></div>
                    </div>
                    <div class="media tasks">
                      <div class="pull-left task-checkbox">
                        <input class="task-input" name="task" type="checkbox" value="">
                      </div>
                      <div class="media-body"> Hold a training session for all attending staff and brief them on all activities and expectations for the day of the event.</div>
                    </div>
                    <div class="media tasks">
                      <div class="pull-left task-checkbox">
                        <input class="task-input" name="task" type="checkbox" value="">
                      </div>
                      <div class="media-body"> Appoint an adequate number of staff as greeters to welcome guests and orient them with the event activities and venue.</div>
                    </div>
                    <div class="add-task"><a href="#">Add Task</a></div>
                    <div class="form-add-task">
                      <form action="addtask.php" method="post">
                        <input type="text" class="form-control task-input">
                        <input class="btn btn-sm btn-default" name="submit-task" type="submit" value="Add Task">
                      </form>
                    </div>
                  </div>
                </div>
              </div>
              <!-- / Checklist -->

jQuery 代码:

$('input.checklist-input').on('change',function(){
  $(this).parent().siblings('.task-list').find('input.task-input').prop('checked',$(this).prop('checked'));
})

Answer 1

与 Caio Vianna 类似，只是一个不同的 if，并且针对正确的列表。如果不再有任何已检查的任务，还添加了检查 list 的取消检查。不过，我相信您可以优化选择器，无论如何应该会有帮助

$('input.task-input').on('change', function () {
    if ($(this).prop('checked') === true) {
        $(this).closest('div.tasks').parent().prev().find('input.checklist-input').prop('checked', true);
    } else {
        var checked = $(this).closest('div.task-list').find('input.task-input:checked').length;
        if (checked === 0) {
            $(this).closest('div.tasks').parent().prev().find('input.checklist-input').prop('checked', false);
        }
    }
})