javascript - setting Dropdown value by JQuery -

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i have tried various method none of them seems working ..

my dropdown autocomplete , have used "select2" plugin that

this dropdown 

@html.dropdownlist(model.deptprop, new selectlist(bmsa.ui.utility.utility.getalldepartments(model.countrycode), "value", "text", model.deptid), new { onchange = "getarrnds();" })

this jquery function 

 function loadmap(qstr){     alert($('select[name$=deptid]').val()); //this working fine, getting value dropdown     // following methods not working     var deptid=3;     $("select[name$=deptid]").val(deptid);     $("select[name$=deptid]").get(0).selectedindex = deptid;     $('select[name$=deptid]').val(deptid).attr("selected", "selected");     $('select[name^="deptid"] option:selected').attr("selected",deptid);     $('select[name^="deptid"] option[index="3"]').attr("selected","selected");   }

this parsed html

<span class="select2-selection select2-selection--single" role="combobox" aria-haspopup="true" aria-expanded="false" tabindex="0" aria-labelledby="select2-deptid-container"><span class="select2-selection__rendered" id="select2-deptid-container" title="select below">select below</span><span class="select2-selection__arrow" role="presentation"><b role="presentation"></b></span></span>

what can try more set value

you need trigger manually change event. taking https://select2.github.io/examples.html

 $("select[name$=deptid]").val(deptid).trigger("change")

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