如何使用 PHP 设置 HTML 选择框的选定值

Question

我有下一块模板：

<select name="interest">
    <option value="seo">SEO и Блоговодство</option>
    <option value="auto">Авто</option>
    <option value="business">Бизнес</option>
    <option value="design">Дизайн</option>
    ...

并将结果值存储在$result['interest']。

如何使用 PHP 将 option 元素标记为选中？

谢谢！

Answer 1

手动方式.....

<select name="interest">
    <option value="seo"<?php if($result['interest'] == 'seo'): ?> selected="selected"<?php endif; ?>>SEO и Блоговодство</option>
    .....

更好的方法是遍历兴趣

$interests = array(
    'seo' => 'SEO и Блоговодство',
    'auto' => 'Авто',
    ....
);

<select name="interest">
<?php foreach( $interests as $var => $interest ): ?>
<option value="<?php echo $var ?>"<?php if( $var == $result['interest'] ): ?> selected="selected"<?php endif; ?>><?php echo $interest ?></option>
<?php endforeach; ?>
</select>

Answer 2

<?php
$interests = array('seo' => 'SEO и Блоговодство',  'auto' => 'Aвто', 'business' => 'Бизнес', ...);
?>
<select name="interest">
<?php
foreach($interests as $k => $v) {
?>
   <option value="<?php echo $k; ?>" <?php if($k == $result['interest']) ?> selected="selected" <?php } ?>><?php echo $v;?></option>
<?php
}
?>
</select>

Answer 3

<?php
$list='<select name="interest">
    <option value="seo">SEO и Блоговодство</option>
    <option value="auto">Авто</option>
    <option value="business">Бизнес</option>
    <option value="design">Дизайн</option>
    ...';
echo str_replace('value="' . $result['interest'] . '"','value="' . $result['interest'] . '" selected',$list);

?> 这包括制作一个包含您的列表的字符串，然后使用字符串替换功能找到正确的选项并将选择添加到标签中。如果使用 XHTML，则需要使用 selected="selected"。

http://sandbox.onlinephpfunctions.com/code/37eb8f5a213fe5a252cd4da6712f3db0c5558ae3

Answer 4

<select name="interest">
    <option value="seo"<?php if($result['interest'] == 'seo'){ echo ' selected="selected"'; } ?>>SEO</option>
    <option value="auto"<?php if($result['interest'] == 'auto'){ echo ' selected="selected"'; } ?>>Auto</option>
    <option value="business"<?php if($result['interest'] == 'business'){ echo ' selected="selected"'; } ?>>Business</option>
    <option value="design"<?php if($result['interest'] == 'design'){ echo ' selected="selected"'; } ?>>Design</option>
</select>

Answer 5

<select name="interest">
<option value="seo" <?php echo $result['interest'] == 'seo' ? 'selected' : ''?> >SEO и Блоговодство</option>
<option value="auto" <?php echo $result['interest'] == 'auto' ? 'selected' : ''?>>Авто</option>
<option value="business" <?php echo $result['interest'] == 'business' ? 'selected' : ''?>>Бизнес</option>
<option value="design" <?php echo $result['interest'] == 'design' ? 'selected' : ''?>>Дизайн</option>

Answer 6

您需要让 PHP 为适当的 <option> 标签插入 selected="selected" 属性，如下所示：

<?php $result=$userRow['ad_type']; ?>
           <select class="form-control" name="ad_type">
              <option <?php if($result == 'text'){ echo ' selected="selected"'; } ?> value="text">Text</option>
              <option <?php if($result == 'image'){ echo ' selected="selected"'; } ?> value="image">Image</option>
              <option <?php if($result == 'video'){ echo ' selected="selected"'; } ?> value="video">Video</option>
              <option <?php if($result == 'htmladsense'){ echo ' selected="selected"'; } ?> value="htmladsense">Html Adsense</option>
            </select>

Answer 7

另一种方式（在 WordPress 中使用）Link to Wordpress code 采用可重用性是：

    <select name='result[interest]' style="width:400px">
        <option value='SEO' <?php selected($result['interest'], 'SEO'); ?>>SEO</option>
        <option value='AUTO' <?php selected($result['interest'], 'AUTO'); ?>>Auto</option>
    </select>

selected() 函数确定是否选择了值并设置选择的选项。

/**
 * Outputs the html selected attribute.
 *
 * Compares the first two arguments and if identical marks as selected
 *
 * @since 1.0.0
 *
 * @param mixed $selected One of the values to compare
 * @param mixed $current  (true) The other value to compare if not just true
 * @param bool  $echo     Whether to echo or just return the string
 * @return string html attribute or empty string
 */
function selected( $selected, $current = true, $echo = true ) {
    return __checked_selected_helper( $selected, $current, $echo, 'selected' );
}

selected()函数依次调用下面的helper函数来比较判断该值是否被选中。它返回 'selected=selected' 或 ''。

/**
 * Private helper function for checked, selected, disabled and readonly.
 *
 * Compares the first two arguments and if identical marks as $type
 *
 * @since 2.8.0
 * @access private
 *
 * @param mixed  $helper  One of the values to compare
 * @param mixed  $current (true) The other value to compare if not just true
 * @param bool   $echo    Whether to echo or just return the string
 * @param string $type    The type of checked|selected|disabled|readonly we are doing
 * @return string html attribute or empty string
 */
function __checked_selected_helper( $helper, $current, $echo, $type ) {
    if ( (string) $helper === (string) $current ) {
        $result = " $type='$type'";
    } else {
        $result = '';
    }

    if ( $echo ) {
        echo $result;
    }

    return $result;
}

Answer 8

简单的速记方法是

//after pulling your content from database
$value = interest['value'];
<option value="seo" <?php echo ($value == "seo") ? 'selected = "selected"' : '' ;?> >SEO и Блоговодство</option>
...

希望对你有帮助

Answer 9

不需要写任何东西。 只需输入以下代码

            `<div class="form-group">
                <label for="title">Blog Trending Or Not ?</label><br>
                <select class="custom-select" id="inputGroupSelect01"  name="interest">
                    
                    <option value="seo"<?php if($row['is_trending']=="seo"){echo "selected";} ?>>SEO и Блоговодство</option>
                    <option value="auto"<?php if($row['is_trending']=="auto"){echo "selected";} ?>>Авто</option>
                    <option value="business"<?php if($row['is_trending']=="business"){echo "selected";} ?>>Бизнес</option>
                    <option value="design"<?php if($row['is_trending']=="design"){echo "selected";} ?>>Дизайн</option>
                </select>
            </div>`