javascript - Php: How to get textbox value from mysql database without submitting the form -

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i want check values either 1 of 2 textboxes text boxes matches value other without submitting form. keypress event handling this, sending value jour_info.php page get_sid.php page. have 2 files

  1. jour_info.php
  2. get_sid.php

the code in first file

<form method="post" name="journ_form" > p-issn/isbn<br/><input name="printissn" id="printissn_input" type="text" value="">                                             <input type="text" name="pissnsid" id="pissnsid" style="width: 30px;" autocomplete="off" value="">                                              <span style="color: red;" id="feedback"></span>  </form>  <script type="text/javascript">  $(document).ready(function(){ $('#feedback').load('get_sid.php').show();  $('#printissn_input').keyup(function(){      $.post('get_sid.php', {printissn: journ_form.printissn.value},     function(result) {         //$('#feedback').html(result).show();         document.getelementbyid('pissnsid').value = result;     });  });   $('#pissnsid').keyup(function(){     $.post('get_sid.php', {pissnsid: journ_form.pissnsid.value},     function(result) {         document.getelementbyid('printissn_input').value = result;     }); }); });

the code in second file

<?php  include 'auth.php';   $printissn = $_post['printissn'];  $pissnsid = $_post['pissnsid'];   if($printissn){ $check = mysql_query("select printissn, pissnsid jour_entries   printissn='$printissn'"); $check_num_rows = mysql_num_rows($check); while($row = mysql_fetch_array($check)){     //$get_printissn = $row['printissn'];     $get_printissnsid = $row['pissnsid'];     if($check_num_rows == 0){         echo '';     } else if($check_num_rows == 1){         echo $get_printissnsid;      } }   } else if($pissnsid){   $check = mysql_query("select printissn, pissnsid jour_entries pissnsid='$pissnsid'");   $check_num_rows = mysql_num_rows($check);   while($row = mysql_fetch_array($check)){ $get_printissn = $row['printissn']; //$get_printissnsid = $row['pissnsid']; if($check_num_rows == 0){     echo ''; } else if($check_num_rows == 1){     echo $get_printissn;     }   } }  ?>

now working fine, problem when value entered in first text box showing corresponding match in second text box. in case if value doesn't match 2 fields , user needs enter manually data, problem arises. when there no match , user enters value in first textbox, second textbox value disappears. how solve that?

try this:

jour_info.php changes:

$('#pissnsid').keyup(function(){     $.post('get_sid.php', {pissnsid: journ_form.pissnsid.value},      function(result) {         if('' != result)             document.getelementbyid('printissn_input').value = result;     }); });

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