Wagtail自定义管理员的“页面”部分

Question

我要在我的wagtail网站上为“页面”部分添加搜索面板。 但是，即使wagtail支持管理部分（https://docs.wagtail.io/en/v2.0/advanced_topics/customisation/admin_templates.html）的自定义模板，我也无法在此页面中添加搜索输入，例如“图片”，“文档”等。

我试图添加模板dashboard.templates.wagtailadmin，如下所示：

{% extends "wagtailadmin/pages.html" %}

{% block branding_welcome %}
<div class="left">
    <div class="col header-title">
        <h1 class="icon icon-doc-full-inverse">
        Pages</h1>
    </div>
    <form
    class="col search-form"
    action="/admin/choose-page/search/?page_type=wagtailcore.page"
    method="get"
    novalidate=""
    role="search">
        <ul class="fields">
            <li class="required">
                <div class="field char_field text_input field-small iconfield">
                    <label for="id_q">Cerca termine:</label>
                    <div class="field-content">
                        <div class="input icon-search ">
                            <input type="text" name="q" placeholder="search" required="" id="id_q">
                            <span></span>
                        </div>
                    </div>
                </div>
            </li>
            <li class="submit visuallyhidden"><input type="submit" value="Search" class="button"></li>
        </ul>
    </form>
</div>
{% endblock %}