使用下拉菜单更改数据库值时出错

Error when using drop menu to change database value

本文关键字:出错 数据库 下拉菜单      更新时间:2023-09-26

当我选择下拉菜单选项更改数据库中的值为所选值时,它会给出此错误:

SyntaxError: missing ) after argument list changeGroup("email@email.com")

基本上我想做的是我有一个存储联系人的应用程序,在未分组的联系人部分它有下拉菜单,当你从它选择一个值,它提交的值,并使用该值来更新数据库。我使用:

action='javascript:changeGroup(".$contactDetails.")

告诉update语句要更新哪个联系人。

我代码:

<!--Include Database connections info-->
<?php include('config.php'); ?>
<!--Links to CSS file for formatting-->
<link href="Contacts.css" rel="stylesheet" type="text/css"/>
<!--Links to Javascript file for the for action to change the group of a contact-->
<script src="ajax.js" language="javascript"></script>
<?php
$contactDetails = $_GET['contactDetails'];
    $cdquery="SELECT * FROM `contacts` WHERE `newEmail` = '$contactDetails'";
    $cdresult=mysql_query($cdquery) or die ("Query to get data from first table failed: ".mysql_error());
  while ($row = mysql_fetch_assoc($cdresult)) 
  {
    echo "" . $row['newFname'] . " " . $row['newLname'] . "'s " . "Details:";
    echo "<table>";
    echo "<tr>";
    echo "<th>Name:</th>";
    echo "<th>Email Address:</th>";
    echo "<th>Phone:</th>";
    echo "<th>Postal Address:</th>";
    echo "<th>Group:</th>";
    echo "</tr>";
        echo "<tr>";
        echo "<td>" . $row['newFname'] . " " . $row['newLname'] . "</td>";
        echo "<td>" . $row['newEmail'] . "</td>";
        echo "<td>" . $row['newPhone'] . "</td>";
        echo "<td>" . $row['newAddress'] . "</td>";
        echo "<td>" . $row['group'] . "</td>";
        echo "</tr>";
    }
    echo "</table>";
    echo "<form action='javascript:changeGroup(".$contactDetails.")' method='get'> Add contact to 
    <select id='group' name='group' onchange='this.form.submit(value=this.options[this.selectedIndex].value)'>
    <option>Select a group...</option> 
    <option value='Family'>Family</option> 
    <option value='Friends'>Friends</option> 
    <option value='Colleagues'>Colleagues</option></select>
    group.</form>";
mysql_close($link);
?>
ajax功能:

function changeGroup(str)
    {
    document.getElementById("content02").innerHTML="";
    if (str=="")
    {
    document.getElementById("content02").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("content02").innerHTML=xmlhttp.responseText;
    document.getElementById("content02").innerHTML = "";
    }
    }
    xmlhttp.open("GET",'getChangeGroup.php?contactChange='+contactChange+'&group='+group,true);
    xmlhttp.send();
    xmlhttp.onreadystatechange = changeReload;
    xmlhttp.send(null);
    }
php:

<!--Include Database connections info-->
<?php include('config.php'); ?>
<!--Links to CSS file for formatting-->
<link href="Contacts.css" rel="stylesheet" type="text/css"/>
<?php
$contactChange = $_GET['contactChange'];
$group = $_GET['group'];
$cdquery="UPDATE `contacts` SET `group` = '$group' WHERE `newEmail` = '$contactChange'";
$cdresult=mysql_query($cdquery) or die ("Query to get data from first table failed: ".mysql_error());
mysql_close($link);
?>

我真的不知道你的代码是做什么的,我也没有耐心在我这端完全复制它,但就像它一样,你正在传递一个变量给你的函数,而不是字符串,在这一行:

echo "<form action='javascript:changeGroup(".$contactDetails.")' method='get'> Add contact to 

要解决这个问题,您需要将字符串引用为实际字符串:

echo "<form action='javascript:changeGroup(''".$contactDetails."'')' method='get'> Add contact to 
我想这是你的主要问题。如果没有这些引号,javascript将把你的回显变量视为js变量,而不是字符串。

关于你的数据库交互…

还有,你使用了一个不推荐的…以及即将被移除的数据库交互API。我推荐PDO来代替它,它可以防止注入攻击,并且在不久的将来不会被删除,在这里了解更多关于它的信息。