[英]Clear dropdown selection on radio button click
I have a set of radio buttons. 我有一组单选按钮。 When primary is selected, the Primary Company field is hidden. 选择主要时,将隐藏“主要公司”字段。 I would also like to at this time clear the drop down selection. 我还想在此时清除下拉选择。 How can I do this? 我怎样才能做到这一点?
<p>
<label>Company Type:</label>
<label for="primary"><input onclick="javascript: $('#sec').hide('slow');" type="radio" runat="server" name="companyType" id="primary" checked />Primary</label>
<label for="secondary"><input onclick="javascript: $('#sec').show('slow');" type="radio" runat="server" name="companyType" id="secondary" />Secondary</label>
<div id="sec">
<label for="primary_company">Primary Company:</label>
<%= Html.DropDownList("primary_company", Model.SelectPrimaryCompanies, "** Select Primary Company **") %>
</div>
</p>
You can clear the selection (that is, select the first option) like so: 您可以清除选择(即,选择第一个选项),如下所示:
$("#primary_company").find('option:first')
.attr('selected','selected');
您可以将null传递给jQuery val()
方法,作为清除下拉列表的好方法。
$('#primary_company').val(null);
To clear the selection completely (so that not even the first element is selected) you could use: 要完全清除选择(以便即使没有选择第一个元素),您也可以使用:
$('#primary_company').attr('selectedIndex', '-1');
If #primary_company
is a multiple select box you could use: 如果#primary_company
是一个多选框,您可以使用:
$('#primary_company option').attr('selected', false);
$("#primary_company").find('[selected]').removeAttr("selected");
This is the best short way that works for me: 这是对我有用的最好的简短方法:
$("#selectNetBankNameId")[0].selectedIndex = 0;
$("#selectNetBankNameId").trigger("change");
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