javascript - jQuery set Multi Select OptGroup options -


i have multi-select list optgroups so:

<select multiple="multiple" id="idcountry">     <optgroup label="asia">       <option value="australia">australia</option>       <option value="china">china</option>     </optgroup>     <optgroup label="europe">       <option value="france">france</option>       <option value="uk">uk</option>     </optgroup> </select>

how can have jquery select destinations in europe user label? how unselect destinations in optgroup label well?

added ejay's amusement. i've tried doesn't work , don't know go here. 

$(".chkregion").click(function () {     if (this.checked) {         var optgroup = $('select optgroup[label="' + this.checked + '"]')         optgroup.attr('selected', true);     } });

to set 

$('optgroup[label=europe] option').prop('selected',true);

change label value , boolean accordingly unselect

demo


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