how to get value from url parameter using javascript or jquery

Question

I have an issue in getting value from url, I have a link which shows up a modal as I have

<a href='#modal?userId=<%=resultSet.getInt("drid")%>' class="button-border toggleModal">Apportionment</a>

above link opens up the modal is 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 I have a url like

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

now I want to get value of userId parameter using the 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 be able to get value from http://localhost:8080/app/#modal?userId=1

Answer 1

#modal?userId=1

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

i.e.

?userId=1#modal

If you don't want to send that data to the server, then you need to read the fragment identifier (location.hash) and split it on the ? to get the piece you need.

Answer 2

Use the jquery url parser plugin:

$.url().param('userId');

EDIT: If you have the URL in a string, you can do:

$.url('http://localhost:8080/app/#modal?userId=1').param('userId'); // returns '1'

EDIT 2: This works:

$.url($.url('http://localhost:8080/app/#modal?userId=1').fsegment(1)).param('userId')) //returns '1'

Answer 3

function getUrlParams() {   
    var url = window.location
    var inputParam = 'DBName'//input parameter 
    var params = url.split('?');     
    var b = params[1].split('&');   
    for (i=0; i<b.length; i++){
    var c= b[i].split('=');
    if (c[0] == inputParam){
       alert(c[1]);//return the parameter value
       break;
}