本文介绍了返回undefined,而不是价值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我有一个网页,应该显示由AJAX从数据库中获取的一些数据,而是它会显示错误消息。

这显示了数据的页面:

 < HTML>
  < HEAD>
    <风格类型=文本/ CSS>
    一个 {
        文字修饰:无;
    }
    < /风格>
    <脚本类型=文/ JavaScript的>
    功能showUser(STR){
        如果(STR ==){
            的document.getElementById(txtHint)的innerHTML =。
            返回;
        }
        如果(window.XMLHtt prequest){
            // $ C $下IE7 +,火狐,Chrome,歌剧,Safari浏览器
            XMLHTTP =新XMLHtt prequest();
        } 其他 {
            // code对IE6,IE5
            XMLHTTP =新的ActiveXObject(Microsoft.XMLHTTP);
        }
        xmlhttp.onreadystatechange =功能(){
            如果(xmlhttp.readyState == 4和&安培; xmlhttp.status == 200){
                的document.getElementById(txtHint)的innerHTML = xmlhttp.responseText。
            }
        }
        xmlhttp.open(GET,getinfo.php Q =?+ STR,真正的);
        xmlhttp.send();
    }
    < / SCRIPT>
  < /头>
  <身体GT;
    < PHP
      的mysql_connect(localhost,则用户名,密码);
      mysql_select_db(数据库名称);

      // $ niftystocks =阵列();

      $平方=SELECT TPNT code从`niftystock`;
      $ R =请求mysql_query($平方米);

      $ i = 0;
      而($ RO = mysql_fetch_array($ R)){
          // array_push($ niftystocks,$行['TPNT code']);
          $ tpnt = $ RO ['TPNT code'];

          $ SQL =SELECT * FROM`nsepricequotes_latest`那里TickerPlant code ='$ tpnt';
          $ RS =的mysql_query($ SQL);
          $行= mysql_fetch_array($ RS);

          如果($ I == 0)
              回声  -  。 $行['日期时间'。  - ;
          $ SY = $行['符号'];
          回声&所述;跨度的id ='txtHint'>&所述; /跨度>&所述; A HREF =#>&所述;跨越的onmouseover ='showUser()'> $ SY&所述; /跨度计算值:。 $行['LastTradedPrice']。 ($行['PercentChange']。)&所述; / A>中;
          如果($行['PercentChange']≥= 0)
              回声< IMG SRC =HTTP://mastertrade.in/master/ticker/images/arrow-up.gif边框='0'> |;
          其他
              回声< IMG SRC =HTTP://mastertrade.in/master/ticker/images/arrow-down.gif边框='0'> |;
          $ I ++;
      }
    ?>
 

getinfo.php:

 < PHP
$ Q = $ _ GET ['Q'];
回声$ Q;
$ CON =的mysql_connect(本地主机,用户名,密码);
如果(!$ CON){
    死亡(无法连接:mysql_error());
}
mysql_select_db(数据库名称,$ CON);
$ SQL1 =从nsepricequotes_latest其中symbol喜欢选择OpenPrice,HighPrice,LowPrice,$ Q';
而($ ROW1 = mysql_fetch_array($ SQL1)){
    $ openprice = $ ROW1 ['OpenPrice'];
    $ highprice = $ ROW1 ['HighPrice'];
    $ lowprice = $ ROW1 ['LowPrice'];
    $ tpnt = $ ROW1 ['TickerPlant code'];
}
$ SQL =SELECT * FROM 52wkhighlow WHERE NFT code ='$ tpnt';
$结果= mysql_query($ SQL);
而($行= mysql_fetch_array($结果)){
    $ wkhigh = $行['BSE52WkHighVal'];
    $ wklow = $行['BSE52wlLowval'];
}

?>
< HTML>
  <身体GT;
    <表>
      &其中; TR>
        < TD>开放式价格与LT; / TD>< TD>< PHP的echo $ openprice; ?>< / TD>
        < TD>高价格< / TD>< TD>< PHP的echo $ highprice; ?>< / TD>
        < TD>低价格< / TD>< TD>< PHP的echo $ lowprice;?>< / TD>
        < TD> 52周新高< / TD>< TD>< PHP的echo $ wkhigh;?>< / TD>
        < TD> 52周最低:LT; / TD>< TD>< PHP的echo $ wklow;?>< / TD>
      < / TR>
    < /表>
  < /身体GT;
< / HTML>
 

我得到这个错误:

解决方案

因为你没有运行 $ SQL1 查询

设置这样的:

  $ SQL1 =选择OpenPrice,HighPrice,LowPrice从nsepricequotes_latest
       WHERE符号,如'mysql_real_escape_string($ Q)。;
$ result_1 =请求mysql_query($ SQL1);
 

再启动:

 而($行= mysql_fetch_array($ result_1))
 

来代替:

 而($行= mysql_fetch_array($ SQL1))
 

I have a page that is supposed to display some data fetched by AJAX from a database, but instead it displays an error message.

The page that shows the data:

<html>
  <head>
    <style type="text/css">
    a {
        text-decoration:none;
    }
    </style>
    <script type="text/javascript">
    function showUser(str) {
        if (str=="") {
            document.getElementById("txtHint").innerHTML="";
            return;
        }
        if (window.XMLHttpRequest) {
            // code for IE7+, Firefox, Chrome, Opera, Safari
            xmlhttp=new XMLHttpRequest();
        } else {
            // code for IE6, IE5
            xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
        xmlhttp.onreadystatechange = function () {
            if (xmlhttp.readyState==4 && xmlhttp.status==200) {
                document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
            }
        }
        xmlhttp.open("GET","getinfo.php?q="+str,true);
        xmlhttp.send();
    }
    </script>
  </head>
  <body>
    <?php
      mysql_connect("localhost","username","password");
      mysql_select_db("databasename");

      //$niftystocks=array();

      $sq="SELECT TPNTCode FROM `niftystock`";
      $r=mysql_query($sq);

      $i=0;
      while ($ro=mysql_fetch_array($r)) {
          //array_push($niftystocks,$row['TPNTCode']);
          $tpnt=$ro['TPNTCode'];

          $sql="SELECT * FROM `nsepricequotes_latest` where TickerPlantCode = '$tpnt' ";
          $rs=mysql_query($sql);
          $row=mysql_fetch_array($rs);

          if ($i == 0)
              echo "--" . $row['DateTime'] . "--";
          $sy=$row['Symbol'];
          echo "<span id='txtHint'></span><a href='#'><span onmouseover='showUser()'>$sy</span>: " . $row['LastTradedPrice'] . " (" . $row['PercentChange'] . ")</a>";
          if($row['PercentChange'] >= 0)
              echo " <img src='http://mastertrade.in/master/ticker/images/arrow-up.gif' border='0' > | ";
          else
              echo " <img src='http://mastertrade.in/master/ticker/images/arrow-down.gif' border='0' > | ";
          $i++;
      }
    ?>

getinfo.php:

<?php
$q=$_GET['q'];
echo $q;
$con = mysql_connect('localhost', 'username', 'password');
if (!$con) {
    die('Could not connect: ' . mysql_error());
}
mysql_select_db("databasename", $con);
$sql1="Select OpenPrice,HighPrice,LowPrice from nsepricequotes_latest WHERE Symbol like '".$q."' ";
while($row1= mysql_fetch_array($sql1)) {
    $openprice=$row1['OpenPrice'];
    $highprice=$row1['HighPrice'];
    $lowprice=$row1['LowPrice'];
    $tpnt=$row1['TickerPlantCode'];
}
$sql="SELECT * FROM 52wkhighlow WHERE nFTCode = '$tpnt'";
$result = mysql_query($sql);
while($row = mysql_fetch_array($result)) {
    $wkhigh=$row['BSE52WkHighVal'];
    $wklow=$row['BSE52wlLowval'];
}

?>
<html>
  <body>
    <table>
      <tr>
        <td>Open Price</td><td><?php echo $openprice; ?></td>
        <td>High Price</td><td><?php echo $highprice; ?></td>
        <td>Low Price</td><td><?php echo $lowprice;?></td>
        <td>52 Week High</td><td><?php echo $wkhigh;?></td>
        <td>52 Week Low</td><td><?php echo $wklow;?></td>
      </tr>
    </table>
  </body>
</html>

I'm getting this error:

解决方案

because you didn't run your $sql1 query

set this :

$sql1="Select OpenPrice, HighPrice, LowPrice from nsepricequotes_latest
       WHERE Symbol like '". mysql_real_escape_string($q)."' ";
$result_1 = mysql_query( $sql1 );

then start :

while( $row = mysql_fetch_array($result_1) )

instead of :

while( $row = mysql_fetch_array($sql1) )

这篇关于返回undefined,而不是价值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-19 16:20