将HTML下拉菜单默认值改为MySQL值 - Change HTML DropDown Default Value with a MySQL value

我正在制作一个个人资料页面，注册用户可以在其中更新他们的信息。因为用户已经提交了他们的信息，所以我希望他们的信息从数据库中填充到我的HTML表单中。

在PHP中，我创建了填入值的HTML表单。但是，我尝试创建一个IF语句来确定是否选择一个选项作为默认值。现在，我的网站给了我最后一个选项的默认值，未声明。因此，我不确定是否所有if语句都被评估为true，或者是否只是跳到selected=selected。

这是我的HTML，目前嵌入PHP(<?php ?>):

<?php
// Connect to MySQL
$db = mysql_connect("", "xxx", "xxx");
if (!$db)
{
    exit("Error - Could not connect to MySQL");
}
$er = mysql_select_db("cs329e_fall11_nemo008", $db);
if (!$er)
{
    exit("Error - Could not select the database");
}
$query = "SELECT *
FROM tblMembers
WHERE Username = 'fzr11017' ";
$result = mysql_query($query);
if (!$result)
{
    print("Error - The query could not be executed");
    $error = mysql_error();
    print("<p>:" . $error . "</p>");
    exit;
}
$row = mysql_fetch_array($result);
print <<<FORM
<form id="frmRegister" action="update.php" method="post" onsubmit="return Validate()" >
<table>
    <tr>
        <th><br /></th>
        <td><br /></td>
    </tr>
    <tr>
        <th align="left">Username:</th>
        <td><input type="text" name="Username" maxlength="10" value=$row[Username] readonly="readonly"/></td>
    </tr>
    <tr>
        <th align="left">First Name:</th>
        <td><input type="text" name="FirstName" value=$row[FirstName] readonly="readonly" /></td>
    </tr>
    <tr>
        <th align="left">Last Name:</th>
        <td><input type="text" name="LastName" value=$row[LastName] readonly="readonly" /></td>
    </tr>
    <tr>
        <th align="left">Email Address:</th>
        <td><input type="text" name="Email" value=$row[Email] /></td>
    </tr>
    <tr>
        <th align="left">Phone Number:</th>
        <td><input type="text" name="Phone" maxlength="10" value=$row[Phone] /></td>
    </tr>
    <tr>
        <th align="left">Year:</th>
        <td>
            <select name="Year" >
                <option if(strcmp($row[Year], 'Freshman') == 0){ selected="selected"} >Freshman</option>
                <option if(strcmp($row[Year], 'Sophomore') == 0){ selected="selected"} >Sophomore</option>
                <option if(strcmp($row[Year], 'Junior') == 0){ selected="selected"} >Junior</option>
                <option if(strcmp($row[Year], 'Senior') == 0){ selected="selected"} >Senior</option>
            </select>
        </td>
    </tr>
    <tr>
        <th align="left">Primary Major:</th>
        <td>
            <select name="Major">
                <option if($row[Major] == Accounting){ selected="selected"}>Accounting</option>
                <option if($row[Major] == Business Honors Program){ selected="selected"}>Business Honors Program</option>
                <option if($row[Major] == Engineering Route to Business){ selected="selected"}>Engineering Route to Business</option>
                <option if($row[Major] == Finance){ selected="selected"}>Finance</option>
                <option if($row[Major] == International Business){ selected="selected"}>International Business</option>
                <option if($row[Major] == Management){ selected="selected"}>Management</option>
                <option if($row[Major] == Management Information Systems){ selected="selected"}>Management Information Systems</option>
                <option if($row[Major] == Marketing){ selected="selected"}>Marketing</option>
                <option if($row[Major] == MPA){ selected="selected"}>MPA</option>
                <option if($row[Major] == Supply Chain Management){ selected="selected"}>Supply Chain Management</option>
                <option if($row[Major] == Undeclared){ selected="selected"}>Undeclared</option>
            </select>
        </td>
    </tr>
    <tr>
        <th><br /></th>
        <td><br /></td>
    </tr>
    <tr>
        <td align="center"><input type="submit" name="btnSubmit" value="Submit" /></td>
        <td align="center"><input type="reset" value="Reset" /></td>
    </tr>
</table>
</form>
FORM;
?>

你已经混合了HTML和PHP没有声明PHP标签，你也使用'selected'作为属性…

<select name="Major">
    <option <?php echo ($row['Major'] == "Accounting") ? " selected" : ""; ?>>Accounting</option>
    ....
</select>

我已经完成了第一个，但是你可以遵循相同的模式

这段代码看起来可以使用毛巾:

<select name="Major">
<?php
  $options = array(
      'Accounting'
    , 'Business Honors Program'
    , 'Engineering Route to Business'
    , 'Finance'
    , 'International Business'
    , 'Management'
    , 'Management Information Systems'
    , 'Marketing'
    , 'MPA'
    , 'Supply Chain Management'
    , 'Undeclared'
  );
  foreach( $options as $option )
  {
    printf(
      "<option%s>%s</option>'n"
        , ($row['Major'] == $option ? ' selected="selected"' : '')
        , htmlentities($option)
    );
  }
?>
</select>

你可能会发现这些内容对解释上面使用的一些概念很有用:

foreach loop
三元运算符(?:)
printf()
htmlentities()

您的代码中似乎缺少任何标记，这意味着没有处理任何内容。应该使用类似这样的代码:

<option <?php if($row["Major"] == "Accounting"){ echo "selected"; } ?>>Accounting</option>