使用 ajax+js 在 symfony4 中进行实时搜索

Question

我想在 symfony 4 下实现实时搜索，但我卡住了。 希望对各位朋友有所帮助。

我的控制器

/**
 * @Route("/search", name="search")
 */
 public function searchAction(Request $request){
    $user = new User();

         $searchTerm = $request->query->get('search');        
         $em = $this->getDoctrine()->getManager();
         $results = $em->getRepository(User::class)->findOneBy(['email' => $searchTerm]);
         //$results = $query->getResult();

         $content = $this->renderView('search.html.twig', [
            'res' => $results,
            'val' => $searchTerm

]);

$response = new JsonResponse();
$response->setData(array('list' => $content));
return $response;
         }

我的脚本 ajax 这是我的 ajax 脚本

    $.ajax({
        type: "GET",
        url: "{{ path('search') }}",
        dataType: "json",
        data: {search: input},
        cache: false,
        success: function (response) {
               $('.example-wrapper').replaceWith(response);
               //$('.example-wrapper').load("{{ path('search') }}?search="+ $search.val());
                console.log(response);
                 },
        error: function (response) {
               console.log(response);
                   }
      });  

search.html.twig

    <form class="example-wrapper" role="search" method="post" action="{{ path('search') }}">
    <div>
        <input type="text" class="form-control" name="search" value="{{ val }}">
            <button type="submit" class="btn btn-success" name="sub">search</button>
    </div>
    </form>

    <div class="example-wrapper">
    {% for result in res %}
    <p style="display:inline-block;width:200px;">{{ result.fullname }}</p>
    <p style="display:inline-block;width:100px;">{{ result.username }}</p>
    <p style="display:inline-block;width:300px;">{{ result.email }}</p>
    <p style="display:inline-block;width:120px;">{{ result.roles[0] }}</p> 
    {% endfor %}
    </div>

搜索页面看起来我看不到表单，除非取消 ajax 脚本

Answer 1

你已经接近了。 :) 我个人会做这样的事情。

动作函数：

/**
 * Search action.
 * @Route("/search/{search}", name="search")
 * @param  Request               $request Request instance
 * @param  string                $search  Search term
 * @return Response|JsonResponse          Response instance
 */
public function searchAction(Request $request, string $search)
{
    if (!$request->isXmlHttpRequest()) {
        return $this->render("search.html.twig");
    }

    if (!$searchTerm = trim($request->query->get("search", $search))) {
        return new JsonResponse(["error" => "Search term not specified."], Response::HTTP_BAD_REQUEST);
    }

    $em = $this->getDoctrine()->getManager();
    if (!($results = $em->getRepository(User::class)->findOneByEmail($searchTerm))) {
        return new JsonResponse(["error" => "No results found."], Response::HTTP_NOT_FOUND);
    }

    return new JsonResponse([
        "html" => $this->renderView("search.ajax.twig", ["results" => $results]),
    ]);
}

您的 search.html.twig 不应包含带有结果的 for 循环，而应该只是 this 而不是 for 循环：

<form id="search-form" class="example-wrapper" role="search" method="get" action="{{ path('search') }}">
    <div>
        <input type="text" class="form-control" name="search">
        <button type="submit" class="btn btn-success" name="sub">search</button>
    </div>
</form>

<div id="search-results" class="example-wrapper"></div>

<script type="text/javascript"><!--

jQuery(document).ready(function($){

    $('#search-form').submit(function(e){

        e.preventDefault();
        $('#search-results').html("");

        $.get("{{ path('search') }}/" + input, function(data, textStatus, xhr){

            if ("object" !== typeof data || null === data) {
                alert("Unexpected response from server.");
                return;
            }

            if (!data.hasOwnProperty("html") || typeof data.html != "string" || (data.html = data.html.trim()).length < 1) {
                alert("Empty response from server.");
                return;
            }

            $('#search-results').html(data.html);

        }).fail(function(xhr, textStatus, errorThrown){

            var error = "Unknown error occurred.";
            if ("object" === typeof xhr && null !== xhr && xhr.hasOwnProperty("responseJSON") && "object" === typeof xhr.responseJSON && xhr.responseJSON.hasOwnProperty("error") && "string" === typeof xhr.responseJSON.error && xhr.responseJSON.error.trim().length >= 1) {
                error = xhr.responseJSON.error.trim();
            } else if ("string" === typeof errorThrown && errorThrown.trim().length >= 1) {
                error = errorThrown.trim();
            }

            alert(error);

        });

    });

});

--></script>

然后您应该将search.ajax.html 与search.html.twig 放在同一文件夹中以包含结果循环。这应该只包含以下内容：

{% if results is defined and results is iterable and results|length >= 1 %}
    {% for result in results %}
        <p style="display:inline-block;width:200px;">{{ result.fullname }}</p>
        <p style="display:inline-block;width:100px;">{{ result.username }}</p>
        <p style="display:inline-block;width:300px;">{{ result.email }}</p>
        <p style="display:inline-block;width:120px;">{{ result.roles[0] }}</p>
    {% endfor %}
{% endif %}