我一直在我的网页上使用jquery validate插件。所以这是我的情景：
我有两个按钮Button1和Button2，当我点击Button1时，应该启用选择字段/下拉列表的验证，当我点击Button2时，应该禁用验证。
尝试以下方法但未取得任何成功：
$("#"+elementId).attr("validation", "");
$("#"+elementId).removeAttr("validation");
$("#"+elementId).removeClass("required");
$("#"+elementId).removeClass("validation");
需要删除以下HTML的验证
<div class='question ' id='questionDiv_16881'><div class="ui-btn ui-btn-icon-right ui-li-has-arrow ui-corner-all ui-li-has-count ui-btn-up-c"><div class="questionText">2.11 Multi-Part - Conditional - Drop Down</div></div><div class="mainQuestion"><div data-role="fieldcontain">
<fieldset data-role="controlgroup" data-type="horizontal">
<legend>Multi-Part - Conditional - Drop Down</legend>
<input type="radio" class="required checklistQuestionField" name="Question_16881" id="Question_16881_DropDown" value="Drop Down"/>
<label for="Question_16881_DropDown">Drop Down</label><input type="radio" class="required checklistQuestionField" name="Question_16881" id="Question_16881_NoDropDown" value="No Drop Down"/>
<label for="Question_16881_NoDropDown">No Drop Down</label>
<img class="questionImage" src="" data-role="questionReferenceImage" id="Question_16881_ReferenceImage"/>
</fieldset></div></div><div class='questionParts' id='questionPartsDiv_16881'></div></div>
当用户点击＆＃34; DropDown＆＃34;时，会出现选择字段按钮
<label for="QuestionPart_717496" generated="true" class="" style="display: block;">This field is required.</label><legend>Drop Down<span style="vertical-align: top;color:red;margin-left:5px;"></span></legend><div class="ui-select"><div data-corners="true" data-shadow="true" data-iconshadow="true" data-wrapperels="span" data-icon="arrow-d" data-iconpos="right" data-theme="d" class="ui-btn ui-btn-up-d ui-shadow ui-btn-corner-all ui-btn-icon-right"><span class="ui-btn-inner"><span class="ui-btn-text"><span class="checklistQuestionField">Select...</span></span><span class="ui-icon ui-icon-arrow-d ui-icon-shadow"> </span></span><select id="QuestionPart_717496" class="checklistQuestionField dropdownValid" validation="required" name="QuestionPart_717496">
<option>Select...</option>
<option value="List Item 1">List Item 1</option><option value="List Item 2">List Item 2</option><option value="List Item 3">List Item 3</option><option value="List Item 4">List Item 4</option><option value="List Item 5">List Item 5</option>
</select></div></div>