根据mysql字段设置所选选项

Question

我有一个HTML表单，用户可以使用它来编辑mysql数据库中的行，PHP脚本查询数据库，然后以表单形式显示当前数据。 我对类似这样的文本字段可以正常工作：

Correct Answer:<input type="text" name="answer" value="<?php echo $row['CorrectAnswer']; ?>"><br>

和简单的收音机设置如：

<?php 
            if ($row['Hazardous'] == "no"){
        ?>      
        Hazardous?:<input type="radio" name="hazardous" value="yes">Yes 
            <input type="radio" name="hazardous" value="no" checked="checked">No<br>
        <?php
            }else{
        ?>
        Hazardous?:<input type="radio" name="hazardous" value="yes" checked="checked">Yes   
            <input type="radio" name="hazardous" value="no" >No<br>
        <?php } ?>

我也有一个select选项元素，如下所示：

Category: <select name="category">
                <option value="hazardawareness">Hazard Awareness</option>
                    <option value="observation">Observation</option>
                    <option value="insurance">Insurance</option>
                    <option value="attitude">Attitude</option>
                    <option value="knowledge">Gen. Knowledge</option>
            </select><br>

即时通讯试图建立，我可以使用：

<?php if ($row['Category'] == "hazardawareness"){ ?>        
    Category: <select name="category">
                <option value="hazardawareness" selected="selected">Hazard Awareness</option>
                    <option value="observation">Observation</option>
                    <option value="insurance">Insurance</option>
                    <option value="attitude">Attitude</option>
                    <option value="knowledge">Gen. Knowledge</option>
            </select><br>   
<?php }else if ($row['Category'] == "observation"){ ?>
Category: <select name="category">
                <option value="hazardawareness">Hazard Awareness</option>
                    <option value="observation" selected="selected">Observation</option>
                    <option value="insurance">Insurance</option>
                    <option value="attitude">Attitude</option>
                    <option value="knowledge">Gen. Knowledge</option>
            </select><br>   
<?php }else if ($row['Category'] == "insurance"){ ?>
Category: <select name="category">
                <option value="hazardawareness">Hazard Awareness</option>
                    <option value="observation">Observation</option>
                    <option value="insurance"selected="selected">Insurance</option>
                    <option value="attitude">Attitude</option>
                    <option value="knowledge">Gen. Knowledge</option>
            </select><br>   
<?php }else if ($row['Category'] == "attitude"){ ?>
Category: <select name="category">
                <option value="hazardawareness">Hazard Awareness</option>
                    <option value="observation">Observation</option>
                    <option value="insurance">Insurance</option>
                    <option value="attitude" selected="selected">Attitude</option>
                    <option value="knowledge">Gen. Knowledge</option>
            </select><br>   
<?php }else if ($row['Category'] == "knowledge"){ ?>
Category: <select name="category">
                <option value="hazardawareness" >Hazard Awareness</option>
                    <option value="observation">Observation</option>
                    <option value="insurance">Insurance</option>
                    <option value="attitude">Attitude</option>
                    <option value="knowledge" selected="selected">Gen. Knowledge</option>
            </select><br>   
<?php } ?>

但是，也许有一种更好的方法可以做到这一点，而无需复制太多代码？

Answer 1

您可以在option创建中添加if子句，如果需要，该子句将位于selected属性。

<?php $options = array( 
                 "Hazard Awareness" => hazardawareness, 
                 "Observation" => observation,
                 "Insurance" => insurance, 
                 "Attitude" => attitude 
              );  ?>
<select name="category">
<?php  foreach($options as $display => $value) {  ?>
    <option value='<?= $value ?>' <?php if($row['Category'] == trim($value)) { ?>selected='selected'<?php } ?>>
        <?= $display ?>
    </option>
<?php } ?>
</select>

Answer 2

我认为这将帮助您使用更少的代码来完成工作：

<?php
$options = array(
"Hazard Awareness" => hazardawareness,
"Observation" => observation,
"Insurance" => insurance,
"Attitude" => attitude
);
echo 'Category:  <select name="category">';
foreach($options as $display => $value) {
if ($row['Category'] == trim($value)) {
    echo '<option value="' . $value . '" selected>' . $display .'</option>';
}
else {
    echo '<option value="' . $value . '">' . $display . '</option>';
}
}
echo '</select>';

将您的期权数据放入array() 。