javascript - 如何将变量传递给functions.php(Wordpress 站点)中的函数

Question

我有一个网站，可以检测用户的位置，并仅显示具有匹配城市分类的帖子。如果没有匹配，用户将被重定向到一个页面以选择可用城市。这是我的功能:

function my_location($q){
if (!$q->is_main_query()) 
    return;
if ($q->is_search()) 
    return;
if ($q->is_archive()){  
    if ( ! is_admin())  {
        if ($userSlug!='Set'){
        $userInfo = geoip_detect_get_info_from_current_ip();
        switch ($userInfo->postal_code){
        case '86403':           
        case '86404':           
        case '86405': 
        case '86406':           
            $city="lake-havasu-city";           
            break;          
        case '86401':           
        case '86402':           
        case '86409':                       
            $city="kingman";            
            break;
        case '86429':           
        case '86430':           
        case '86439':
        case '86442':           
            $city="bullhead-city";          
            break;
        default:
            force_post_city($city);
            exit;
        }   
$q->set( 'tax_query', array(array('taxonomy' => 'pa_city','field' => 'slug',terms' => array( $city ),'operator' => 'IN'))); 
    }}
}
}
add_action( 'pre_get_posts', 'my_location' );

我的问题是，在用户选择城市的页面上，如何将城市传递回此函数，以便他们拉出适当的城市？这是我的表格:

    <form method="post" action="new_location($term_taxonomy)">
<?php
function get_terms_dropdown($taxonomies, $args){
$myterms = get_terms($taxonomies, $args);
$optionname = "optionname";
$emptyvalue = "";
$output ="<select name='".$optionname."'><option selected='".$selected."'        value='".$emptyvalue."'>Select a City</option>'";
foreach($myterms as $term){
$term_taxonomy=$term->pa_city; //CHANGE ME
$term_slug=$term->slug;
$term_name =$term->name;
$link = $term_slug;
$output .="<option name='".$link."' value='".$link."'>".$term_name."</option>";
}
$output .="</select>";
return $output;
}
$taxonomies = array('pa_city'); // CHANGE ME
$args = array('order'=>'ASC','hide_empty'=>true);
echo get_terms_dropdown($taxonomies, $args);                
?>
<input type="submit" value="click" name="submit">

</form>

任何帮助将不胜感激!

Answer 1

session 建议是关键。我选择了 cookies 。因此，首先我添加了一个函数来检查 wordpress 的 init 上的 cookie。如果不存在，我们会尝试确定它们的位置并写入 cookie。然后在 pre_get_post Hook 中，我们将他们定向到包含城市优惠的页面，或者如果他们的城市与现有城市不匹配，我们将他们定向到搜索城市页面:

    add_action( 'init', 'my_setcookie' );
    function my_setcookie() {
    if(!isset($_COOKIE['city'])) {
      $userInfo = geoip_detect_get_info_from_current_ip();
        switch ($userInfo->postal_code){
                case '86403':           
        case '86404':           
        case '86405': 
        case '86406':           
            $city="lake-havasu-city";           
            break;  
        case '86401':           
        case '86402':           
        case '86409':                       
            $city="kingman";            
            break;
        case '86429':           
        case '86430':           
        case '86439':
        case '86442':           
            $city="bullhead-city";          
            break;
        }   
    setcookie( 'city', $city, time() + 3600, COOKIEPATH, COOKIE_DOMAIN );
    }}
    function my_location( $q ){
if (!$q->is_main_query() ) 
    return;
if ($q->is_search()) 
    return;
if ($q->is_archive() ){ 
    if ( ! is_admin() ) {
        if ($userSlug!='Set'){
            if (empty($_COOKIE['city'] )) {
                echo "<script>window.location.href =        'http://thewebsite.com/select-city/';</script>";
                exit();
            }
        $city = isset( $_COOKIE['city'] ) ? $_COOKIE['city'] : 'not set';
        $q->set( 'tax_query', array(array(          'taxonomy'  => 'pa_city',           'field' => 'slug',          'terms' => array(  $city ),         'operator' => 'IN'      )));    
    }}
  }
    }

    add_action( 'pre_get_posts', 'my_location' );

现在我们在搜索城市页面中找到了它们。我们从属性字段中提取可用城市并列出它们，单击后，将执行 header 中的 javascript 以更新 cookie 并将它们发送到交易:

            <form name="myCity" action="http://thewebsite.com/"  method="POST">
            <?php
                function get_terms_dropdown($taxonomies, $args){
                $myterms = get_terms($taxonomies, $args);
                $optionname = "optionname";
                $emptyvalue = "";
                $output ="<select name='".$optionname."'><option selected='".$selected."' value='".$emptyvalue."'>Select a City</option>'";

                foreach($myterms as $term){
                $term_taxonomy=$term->pa_city; //CHANGE ME
                $term_slug=$term->slug;
                $term_name =$term->name;
                $link = $term_slug;
                $output .="<option name='".$link."' value='".$link."'>".$term_name."</option>";
                }
                $output .="</select>";
                return $output;
                }

                $taxonomies = array('pa_city'); 
                $args = array('order'=>'ASC','hide_empty'=>true);
                echo get_terms_dropdown($taxonomies, $args);

                ?>
                <input type="submit" value="click" name="submit" onclick="WriteCookie()">
                </form>

这是 JavaScript，我们删除现有的 cookie 并设置新的:

                <script type="text/javascript">

                function WriteCookie()
                {
                    document.cookie = "city" + '=; expires=Thu, 01 Jan 1970 00:00:01 GMT;';
                    cookievalue = escape(document.myCity.optionname.value) + ";"
                    document.cookie='city='+cookievalue +'; expires=Fri, 3 Aug 2021 20:47:11 UTC; path=/';
                    window.location.href = "http://thewebsite.com"

                }

就像魅力一样!感谢 Halfer 的 session 建议。