要从下拉列表中获取jquery值，你只需使用下面的函数just sent id并获得所选值:

function getValue(id){
    var value = "";
    if($('#'+id)[0]!=undefined && $('#'+id)[0]!=null){
        for(var i=0;i<$('#'+id)[0].length;i++){
            if($('#'+id)[0][i].selected == true){
                if(value != ""){
                    value = value + ", ";
                }
                value = value + $('#'+id)[0][i].innerText;
            }
        }
    }
    return value;
}

$("select[id$=dropDownId]").val()

试试这个

function fundrp(){ var text_value = $("#drpboxid option:selected").text(); console.log(text_value); var val_text = $("#drpboxid option:selected").val(); console.log(val_text); var value_text = $("#drpboxid option:selected").attr("value") ; console.log(value_text); var get_att_value = $("#drpboxid option:selected").attr("id") console.log(get_att_value); } <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.2.3/jquery.min.js"></script> <select id="drpboxid"> <option id="1_one" value="one">one</option> <option id="2_two" value="two">two</option> <option id="3_three" value="three">three</option> </select> <button id="btndrp" onclick="fundrp()">Tracking Report1234</button>

对于所选文本的使用:

value: $('#dropDownId :selected').text();

对于所选值的使用:

value: $('#dropDownId').val();

对于单个select dom元素，获取当前选择的值:

$('#dropDownId').val();

获取当前选定的文本:

$('#dropDownId :selected').text();

$("#dropDownId").val('2');
var SelectedValue= $("#dropDownId option:selected").text();
$(".ParentClass .select-value").html(SelectedValue);


<p class="inline-large-label button-height ParentClass" >
     <label for="large-label-2" class="label">Country <span style="color: Red;">*</span><small></small></label>
     <asp:DropDownList runat="server" ID="dropDownId " CssClass="select" Width="200px">          
    </asp:DropDownList>
</p>