variables - How to prevent function count when link clicking in javascript? -


i use meteor , there mongodb database. try list item number myself "count" variable. every time click on link on navbar, count without resetting.

for example first time result of clicking "contacts" on navbar show below.

--------------------------------- contacts   products   solutions --------------------------------- item   user 1      2      b 3      c

when click "contacts" again, shows below.

--------------------------------- contacts   products   solutions --------------------------------- item   user 4      5      b 6      c

how can prevent javascript run every time click link?

in code below, have problem "countregister" variable:

import react, { component } 'react'; import proptypes 'prop-types'; import { link } 'react-router-dom'; import { table, alert, button } 'react-bootstrap'; import { meteor } 'meteor/meteor'; import { createcontainer } 'meteor/react-meteor-data'; import { registers } '../../api/registers';   let countregister = 0   const dsregisters = ({ registers, match, history }) => (             <div classname="registers">                 <div classname="page-header clearfix">                     <h4 classname="pull-left">registration</h4>                     <link classname="btn btn-success pull-right" to={`${match.url}/new`}>add user</link>                 </div>                 {registers.length ? <table striped responsive>                 <thead>                     <tr>                         <th>item</th>                         <th>salution</th>                         <th>firt name</th>                         <th>last name</th>                         <th>province</th>                         <th>country</th>                         <th>status</th>                         <th>username</th>                         <th />                         <th />                     </tr>                 </thead>                 <tbody>                     {registers.map(({ _id, regsid, salution, firstname, lastname, province, country, status, username }) => (                     <tr key={_id}>                         <td>{countregister += 1}</td>                         <td>{salution}</td>                         <td>{firstname}</td>                         <td>{lastname}</td>                         <td>{province}</td>                         <td>{country}</td>                         <td>{status}</td>                         <td>{username}</td>                         <td>                             <button                                 bsstyle="primary"                                 onclick={() => history.push(`${match.url}/${_id}`)}                                 block                             >view</button>                         </td>                         <td>                             <button                                 bsstyle="danger"                                 onclick={() => handleremove(_id)}                                 block                                 >delete</button>                         </td>                     </tr>                     ))}                 </tbody>               </table> : <alert bsstyle="warning">nobody yet!</alert>}             </div> );  dsregisters.proptypes = {   registers: proptypes.arrayof(proptypes.object).isrequired,   match: proptypes.object.isrequired,   history: proptypes.object.isrequired, };  export default createcontainer(() => {   const subscription = meteor.subscribe('registers');   return {     registers: registers.find({}, { sort: { regsid: 1 } }).fetch(),   }; }, dsregisters);

as want show 1, 2, 3 each time render component, shouldn't use global var countregister. problem here long don't refresh website, countregister variable never reset 0, global variable gets initialized once, , count continue increase.

instead, use second argument of map method, nl, index

registers.map(({    _id,    regsid,    salution,    firstname,    lastname,    province,    country,    status,    username  }, index) => ( // <- index second argument, starting 0   <tr key={_id}>     <td>{( index + 1)}</td> // <- show 1, 2, 3, increase 1     <td>{salution}</td>     // ...

this keep count way want it


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