jquery - uncaught type error:$ is not a function -

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i have html page below , when select item on dropdown runs function. each time step through function , line

    $("#ddlroute").html(procemessage).show();

i error : uncaught typeerror:$ not function

do know is? how resolve this?

    @using (html.beginform())     {              <div id="rowone-form">                     <div class="section1">                         <h2>select customer</h2>                         <div>                             <label for="branch">branch:</label>                                             @html.dropdownlistfor(m => m.selectedbranch, model.branchlist, "select branch", new { @id = "ddlbranch", @style = "width:200px;", @onchange = "javascript:getroute(this.value);" })                         </div>                         <div>                             <label>route:</label>                             <select id="ddlroute" name="ddlroute" style="width: 200px"></select>                                       </div>                      </div>                        <hr />             <div class="form-buttons-sec" style="margin:35px;">                 <input id="save1" type="button" value="save"/>                 <input id="cancel1" type="button" value="cancel" />             </div>      }     <script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script>     <script language="javascript" type="text/javascript">          function getroute(_branchid) {             var procemessage = "<option value='0'> please wait...</option>";             $("#ddlroute").html(procemessage).show();             var url = "/home/getroutebybranchid/";              $.ajax({                 url: url,                 data: { branchid: _branchid },                 cache: false,                 type: "post",                 success: function (data) {                     var markup = "<option value='0'>select city</option>";                     (var x = 0; x < data.length; x++) {                         markup += "<option value=" + data[x].value + ">" + data[x].text + "</option>";                     }                     $("#ddlroute").html(markup).show();                 },                 error: function (reponse) {                     alert("error : " + reponse);                 }             });           }     </script>

it seems url using obtain reference jquery may incorrect. try using 1 instead...

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script>

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