[从PHP下拉列表中过滤搜索结果

Question

我已经建立了搜索（https://brawlins.com/oer/index.php），我希望使用户能够选择过滤器来限制搜索结果，以限制他们的初始搜索。我在搜索页面（https://brawlins.com/oer/search.php?term=）的下拉菜单中填充了过滤器，但是我不确定一旦用户单击结果后如何过滤结果。我希望用户也能够选择多个选项。我创建一个类来存储过滤器。以下是我的过滤器类中的代码：

<?php
class filterContentProvider {

    private $conn;

    public function __construct($conn) {
        $this->conn = $conn;
    }

    public function getType ($conn) {

        $query = $this->conn->prepare("SELECT type, COUNT(*) as total FROM oer_search GROUP BY type");
        $query->execute();

        $filterHTML .= "<h3 class='filterTitle'>Type</h3>";
        $filterHTML .= "<select class='select-css'>";
        $filterHTML .= "<option value=''>- Type -</option>"; 

        while($row = $query->fetch(PDO::FETCH_ASSOC)) {
            $type = $row["type"];
            $total = number_format($row["total"]);
            $filterHTML .= "<option value='$type'>$type ($total)</option>";
        }

        $filterHTML .= "</select>";

        return $filterHTML;
    }

    public function getSubject ($conn) {

        $query = $this->conn->prepare("SELECT subject, COUNT(*) as total  FROM oer_search GROUP BY subject");
        $query->execute();

        $filterHTML .= "<h3 class='filterTitle'>Subject</h3>";
        $filterHTML .= "<select class='select-css'>";
        $filterHTML .= "<option value=''>- Subject -</option>"; 

        while($row = $query->fetch(PDO::FETCH_ASSOC)) {
            $subject = $row["subject"];
            $total = number_format($row["total"]);
            if ($subject != "") {
              $filterHTML .= "<option value='$subject'>$subject ($total)</option>";  
            }
        }

        $filterHTML .= "</select>";

        return $filterHTML;
    }


    public function getLicense ($conn) {

        $query = $this->conn->prepare("SELECT license, COUNT(*) as total FROM oer_search GROUP BY license");
        $query->execute();

        $filterHTML .= "<h3 class='filterTitle'>License</h3>";
        $filterHTML .= "<select class='select-css'>";
        $filterHTML .= "<option value=''>- License -</option>"; 

        while($row = $query->fetch(PDO::FETCH_ASSOC)) {
            $license = $row["license"];
            $total = number_format($row["total"]);
            if ($license != "") {
              $filterHTML .= "<option value='$license'>$license ($total)</option>";  
            }
        }

        $filterHTML .= "</select>";

        return $filterHTML;
    }

    public function getReviewed ($conn) {

        $query = $this->conn->prepare("SELECT review, COUNT(*) as total FROM oer_search GROUP BY review");
        $query->execute();

        $filterHTML .= "<h3 class='filterTitle'>Reviewed</h3>";
        $filterHTML .= "<select class='select-css'>";
        $filterHTML .= "<option value=''>- Reviewed -</option>"; 

        while($row = $query->fetch(PDO::FETCH_ASSOC)) {
            $review = $row["review"];
            $total = number_format($row["total"]);
            if ($review != "") {
              $filterHTML .= "<option value='$review'>$review ($total)</option>";  
            }
        }

        $filterHTML .= "</select>";

        return $filterHTML;
    }

    public function getOrigin ($conn) {

        $query = $this->conn->prepare("SELECT source, COUNT(*) as total FROM oer_search GROUP BY source");
        $query->execute();

        $filterHTML .= "<h3 class='filterTitle'>Source</h3>";
        $filterHTML .= "<select class='select-css'>";
        $filterHTML .= "<option value=''>- Source -</option>"; 

        while($row = $query->fetch(PDO::FETCH_ASSOC)) {
            $source = $row["source"];
            $total = number_format($row["total"]);
            if ($source != "") {
              $filterHTML .= "<option value='$source'>$source ($total)</option>";  
            }
        }

        $filterHTML .= "</select>";

        return $filterHTML;
    }

}

?>

这是我在search.php页面上使用的代码。任何帮助将不胜感激。

<?php   
include("config.php");
include("classes/siteResultsProvider.php");
include("classes/imageResultsProvider.php");
include("classes/filterContentProvider.php");
include("classes/filterImageProvider.php");

    if(isset($_GET["term"])){
        $term = $_GET["term"];
    }

    if(isset($_GET["collection"])){
        $collection = $_GET["collection"];
    }
    else {
        $collection = "open_content";
    }

    $page = isset($_GET["page"]) ? $_GET["page"] : 1;

?>

<!DOCTYPE html>
<html lang="en">
<head>
    <title>SOAR</title>
<?php
include("header.php");
?>

    <div class="wrapper">
        <div class="header">
            <div class="headerContent">
                <div class="searchContainer">
                    <form action="search.php" method="GET">
                        <div class="searchBarContainer">
                            <input type="hidden" name="collection" value="<?php echo $collection; ?>">
                            <input class="searchBox" type="text" name="term" value="<?php echo htmlspecialchars($term, ENT_QUOTES) ?>" aria-label="search box">
                            <button class="searchButton">
                                <img src="images/search-icon.png" alt="search icon">
                            </button>
                        </div>
                    </form>
                </div>

            </div><!--end of headerContent-->

            <div class="tabsContainer">
                <ul class="tabList">
                    <li class="<?php echo $collection == 'open_content' ? 'active' : '' ?>">
                        <a href='<?php echo "search.php?term=$term&collection=open_content"; ?>'><i class="fas fa-book-open"></i> Open Content</a>
                    </li>
                    <li class="<?php echo $collection == 'images' ? 'active' : '' ?>">
                        <a href='<?php echo "search.php?term=$term&collection=images"; ?>'><i class="fas fa-images"></i> Images</a>
                    </li>
                </ul>
            </div>
        </div><!--end of header-->

<!-------------------------beginning of main section where seach results will display-------------------------->
        <?php
                if($collection == "open_content") {
                    $filters = new filterContentProvider($conn);
                }
                else {
                    $filters = new filterImageProvider($conn);
                }

           if($collection == "open_content") {

                $filterType = $filters->getType($conn);
                $filterSubject = $filters->getSubject($conn);
                $filterOrigin = $filters->getOrigin($conn);
                $fitlerLicense = $filters->getLicense($conn);
                $filterReviewed = $filters->getReviewed($conn);

                echo "<div class='filterContainer'>
                        <div class='filterContent'>
                            <div class='filter'>
                                $filterType
                            </div>
                            <div class='filter'>
                                $filterSubject
                            </div>
                            <div class='filter'>
                                $filterOrigin
                            </div>
                            <div class='filter'>
                                $fitlerLicense
                            </div>
                            <div class='filter'>
                                $filterReviewed
                            </div>
                        </div>
                     </div>"; 
            }
            else {

                $imageFilterOrigin = $filters->getImageOrigin($conn);
                $imageFilterLicense = $filters->getImageLicense($conn);

                echo "<div class='filterContainer'>
                            <div class='filterContent'>
                                <div class='filter'>
                                    $imageFilterOrigin
                                </div>
                                <div class='filter'>
                                    $imageFilterLicense
                                </div>
                            </div>
                         </div>"; 

            }

        ?>

        <div class="mainResultsSection">

            <?php

                if($collection == "open_content") {
                    $resultsProvider = new siteResultsProvider($conn);
                    $pageSize = 25;
                }
                else {
                    $resultsProvider = new imageResultsProvider($conn);
                    $pageSize = 50;
                }  

                $numResults = $resultsProvider->getNumResults($term);

                echo "<p class='resultsCount'>" . number_format($numResults) . " results found</p>";

                echo $resultsProvider->getResultsHTML($page, $pageSize, $term);
            ?>

        </div>

        <div class="paginationContainer">
            <div class="pageButtons">
                <div class="pageNumberContainer">
                    <img src="images/pageStart.png" alt="Start of page image">
                </div>

                <?php
                    $pagesToShow = 10;
                    $numPages = ceil($numResults / $pageSize);
                    $pagesLeft = min($pagesToShow, $numPages);

                    $currentPage = $page - floor($pagesToShow / 2);

                    if($currentPage < 1) {
                        $currentPage = 1;
                    }

                    if($currentPage + $pagesLeft > $numPages + 1) {
                        $currentPage = $numPages + 1  - $pagesLeft;
                    }

                    while($pagesLeft != 0 && $currentPage <= $numPages) {

                        if($currentPage == $page) {
                            echo "<div class='pageNumberContainer'>
                                <img src='images/pageSelected.png' alt='selected page page image'/>
                                <span class='pageNumber'>$currentPage</span>
                                </div>";
                        }
                        else {
                            echo "<div class='pageNumberContainer'>
                                    <a href='search.php?term=$term&collection=$collection&page=$currentPage'>
                                        <img src='images/page.png' alt='pages image'/>
                                        <span class='pageNumber'>$currentPage</span>
                                    </a>
                                </div>";
                        }

                        $currentPage++;
                        $pagesLeft--;

                    }
                ?>

                <div class="pageNumberContainer">
                    <img src="images/pageEnd.png" alt="End of page image">
                </div>
            </div>

        </div><!--end of pagination container-->
    </div><!--end of wrapper-->

    <script src="https://cdn.jsdelivr.net/gh/fancyapps/[email protected]/dist/jquery.fancybox.min.js"></script>
    <script src="https://unpkg.com/masonry-layout@4/dist/masonry.pkgd.min.js"></script>
    <script type="text/javascript" src="js/script.js"></script>
</body>
</html>

Answer 1

似乎您想做一些事情才能使它正常工作。

如果您希望结果是异步的：

将onchange事件添加到您选择的输入中。（类似于onchange="addFilter('type', this.value)"），请参见https://www.w3schools.com/jsref/event_onchange.asp
具有onchange函数（addFilter）通过AJAX请求将过滤器和查询字符串发送回PHP脚本。如果您使用的是jQuery，则get方法将为您工作。 https://api.jquery.com/jquery.get/
使用传递的$ _GET参数将新结果拉入PHP。（就像您已经在脚本中一样。）您将只想回显结果，而不是页面的导航和其他元素。
使用来更新页面上的搜索结果（类似于jQuery中的$('#myContainer').html(results);）
此外，最好在位置栏How do I modify the URL without reloading the page?中更新URL参数

如果您不在乎/不想重新加载页面：

只需使onchange事件再次提交带有搜索参数的表单。如果使用jQuery，则submit方法将起作用。请确保在选择输入中正确选择选项，否则每次都会清除它们（无法设置多个）。

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