이것 저것 해본 결과 아래 소스처럼 했더니 셀렉트 선택시 wr_1,wr_4에 값이 뿌려지긴 하는데,

ajax.wr_code.php에서 db 쿼리문도 안먹히고 wr_1과 wr_4에 그냥 숫자 1만 찍힙니다.

미치고 환장하다 못해 이젠 거품 물겠습니다. 이것 때문에 당췌 몇주째 해메고 있는지..ㅠㅠ

고수님들 제발 도와주십시요ㅠㅠ

소스는 아래에 적여 놓겠습니다.

<script type="text/javascript">
function chkcode(){
 if(fwrite.wr_2.value=="100") { fwrite.wr_3.value="a;  }   
 if(fwrite.wr_2.value=="101") { fwrite.wr_3.value="b; }
 if(fwrite.wr_2.value=="102") { fwrite.wr_3.value="c; }
 if(fwrite.wr_2.value=="103") { fwrite.wr_3.value="d" }
 if(fwrite.wr_2.value=="104") { fwrite.wr_3.value="e; }
 if(fwrite.wr_2.value=="105") { fwrite.wr_3.value="f; }
 if(fwrite.wr_2.value=="106") { fwrite.wr_3.value="g; }
 if(fwrite.wr_2.value=="107") { fwrite.wr_3.value="h; }
 if(fwrite.wr_2.value=="108") { fwrite.wr_3.value="i; }
 if(fwrite.wr_2.value=="109") { fwrite.wr_3.value="j; }
 if(fwrite.wr_2.value=="131") { fwrite.wr_3.value="k; }

 //var x=$("#wr_2 option:selected").val();  
 //$("#wr_2n").val(x);
 function ajaxSelectCode(val) { 

 $.ajax({
  type: 'POST',
  url: g5_bbs_url+'/ajax.wr_code.php',  
  dataType : 'json',
  data: {wr_2: $("#wr_2").val()},
  success: function(data) {
   $('#wr_1').val(data.wr_1);
   $('#wr_4').val(data.wr_4);
  }
 });
} 

</script>

---생략 ---

 <tr>
  <td><input type="text" name="wr_1" value="<?php echo $wr_1 ?>" id="wr_1" required class="num" maxlength="20"></td>
  <td>
   <select class="selc" name="wr_2" id="wr_2" value="<?php echo $wr_2 ?>" onchange="chkcode()" class='selc' required>
    <option value="">업체코드</option>
    <option value="100" <?php if($wr_2 == "100") echo "selected=\"selected\""; ?> label="100" />100</option>
    <option value="101" <?php if($wr_2 == "101") echo "selected=\"selected\""; ?> label="101" />101</option>
    <option value="102" <?php if($wr_2 == "102") echo "selected=\"selected\""; ?> label="102" />102</option>
    <option value="103" <?php if($wr_2 == "103") echo "selected=\"selected\""; ?> label="103" />103</option>
    <option value="104" <?php if($wr_2 == "104") echo "selected=\"selected\""; ?> label="104" />104</option>
    <option value="105" <?php if($wr_2 == "105") echo "selected=\"selected\""; ?> label="105" />105</option>
    <option value="106" <?php if($wr_2 == "106") echo "selected=\"selected\""; ?> label="106" />106</option>
    <option value="107" <?php if($wr_2 == "107") echo "selected=\"selected\""; ?> label="107" />107</option>
    <option value="108" <?php if($wr_2 == "108") echo "selected=\"selected\""; ?> label="108" />108</option>
    <option value="109" <?php if($wr_2 == "109") echo "selected=\"selected\""; ?> label="109" />109</option>
    <option value="131" <?php if($wr_2 == "131") echo "selected=\"selected\""; ?> label="131" />131</option>
   </select> 
  </td>
  <td><input type="text" name="wr_3" value="<?php echo $wr_3; ?>" id="wr_3" readonly='readonly' required class="name" maxlength="20"></td>
  <td><input type="text" name="wr_4" value="<?php echo $wr_4 ?>" id="wr_4" required class="num" maxlength="20"></td>

-- ajax.wr_code.php --

<?php
<?php
include_once('./_common.php');

$wr_2 = $_POST['wr_2'];
$w2 = $wr_2;
$sql = sql_fetch(" select wr_1, wr_4 from $write_table where wr_2='$w2'" );

if($row['wr_1'] && $row['wr_4'] == '') {
 $wr_1 = $wr_4 = 1;
}
else {
 $wr_1 = $row['wr_1']+1;
 $wr_4 = $row['wr_4']+1;
}
 $data = array('wr_1' => $wr_1, 'wr_4' => $wr_4, 'wr_2n' => $wr_2);
 echo json_encode($data);
?>

?>