javascript - increase number automatically in the text field after clicking save button -


i had text field named bill no ,my problem increase value in text field automatically , bill no 1 , after clicking save button should save 1 after saving bill no should automatically increase 2 ,

any advice ?

<%@ page language="java" contenttype="text/html; charset=iso-8859-1"     pageencoding="iso-8859-1"%>   <!doctype html> <html lang="en">    <head>       <meta charset="utf-8">       <title>sales</title>       <link href="css/module.css" rel="stylesheet" type="text/css">       <link href="css/jquery-ui.css" rel="stylesheet" type="text/css"/>        <script type="text/javascript" src="js/jquery.min.js"></script>       <script src="js/jquery-ui.min.js"></script>          <script src="js/date.js"></script>       <script>       $(document).ready(function() {             $(".datepicker").datepicker({dateformat:"yy-mm-dd"});         });         </script>    </head>    <body>        <div class="reg-form">      <form method="post" name="sales" action="sales">             <table class="main">                <thead>                   <tr>                      <th>sales                      </th>                   </tr>                </thead>             </table>             <table class="in-sec-small">                  <tbody>                   <tr>                      <td class="label">                         <label for="patient-type">patient type                         </label>                      </td>                      <td>                         <select id="patient_type" class="textfield-form-req-select" type="text" name="patient_type" required>                            <option value="member">ip</option>                            <option value="non-member">op</option>                             <option value="non-member">wip</option>                         </select>                      </td>                      <td class="label">                         <label for="reg-type">reg type                         </label>                      </td>                      <td>                         <select id="reg_type" class="textfield-form-req-select" type="text" name="reg_type" required>                            <option value="member">member</option>                            <option value="non-member">non member</option>                         </select>                      </td>                      <td class="label">                         <label for="bill-no">bill no                         </label>                      </td>                      <td>                         <input id="bill_no"  class="textfield-form-date-req" type="text" name="bill_no" required>                      </td>                    </tr>

try code below, if save bill no through ajax, increase number in ajax success callback.

$("#your-save-button-id").click(function(){     ... save action here ...     $("#bill_no").val(parseint($('#bill_no').val()) + 1); })

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