how to get value from url parameter using javascript or jquery -

i have issue in getting value url, have link shows modal have

<a href='#modal?userid=<%=resultset.getint("drid")%>' class="button-border togglemodal">apportionment</a> 

above link opens modal given below

<div id="modal" class="modal">         <header>       <h2>appointment form</h2>           </header>     <form action="addappoinment.jsp" method="post">         <input type="hidden" id="docid" name="docid" value=""><br>         <input type="text" required><br>         <input type="text" required><br>         <input type="text" required><br>         <input type="text" required><br>         <textarea rows="4" cols="21"></textarea><br>          <button class="button-border button-success" type="submit">      done</button>      <button class="button-border button-error pull-right togglemodal">       cancel</button>              </form>       </div> 

now have url

http://localhost:8080/app/#modal?userid=1 

now want value of userid parameter using javascript

<script type="text/javascript">  function getparameterbyname(name) {     name = name.replace(/[\[]/, "\\[").replace(/[\]]/, "\\]");     var regex = new regexp("[\\?&]" + name + "=([^&#]*)"),         results = regex.exec(location.search);     return results === null ? "" : decodeuricomponent(results[1].replace(/\+/g, " ")); }  var param = getparameterbyname("userid"); var userid = document.getelementbyid("docid"); userid.value = param;   </script> 

but can not able value http://localhost:8080/app/#modal?userid=1

#modal?userid=1 

the query string (which sent server) has go before fragment identifier (which handled entirely client side).

i.e.

?userid=1#modal 

if don't want send data server, need read fragment identifier (location.hash) , split on ? piece need.