dart - 如何在 Dart 中创建服务器端模板，我可以在其中设置不同的 for each page?</h1> <div id="body"><p>First of all, I really like Dart and keep trying to use it in real projects, but then I hit problems like this one where every other web framework has an obvious</a></h1> <div class="ml12 aside-cta flex--item print:d-none sm:ml0 sm:mb12 sm:order-first sm:as-end"> <a href="https://stackoverflow.com/questions/ask" target="_blank" class="ws-nowrap s-btn s-btnprimary">问问题</a></div> </div> <div class="d-flex fw-wrap pb8 mb16 bb bc-black-075"> <div class="flex--item ws-nowrap mr16 mb8"> <span class="fc-light mr2"></span> </div> <div class="flex--item ws-nowrap mr16 mb8" title="2022-04-17 15:46:40Z"> <span class="fc-light mr2">问问题</span> <time itemprop="dateCreated" datetime="2013-03-26T20:43:01.377">2013-03-26T20:43:01.377</time> </div> <div class="flex--item ws-nowrap mb8" title="Viewed 6 times"> <span class="fc-light mr2"></span> 1843 次 </div> </div> <div id="mainbar" role="main" aria-label="question and answers"> 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itemprop="commentCount">4</span> </div> </div> <div class="js-zone-container zone-container-responsive"> <div id="dfp-isb" class="everyonelovesstackoverflow everyonelovesinline-sidebar mx-auto" style="min-height: auto; height: auto; display: none;"></div> <div class="js-report-ad-button-container mx-auto" style="width: 300px"></div> </div> <div id="answers"> <a name="tab-top"></a> <div id="answers-header"> <div class="answers-subheader d-flex ai-center mb8"> <div class="flex--item fl1"> <h2 class="mb0" data-answercount=""> 2 回答 <span style="display:none;" itemprop="answerCount">2</span> </h2> </div> </div> </div> <a name="7"></a> <div id="answer-7" class="answer js-answer accepted-answer" data-answerid="7" data-parentid="4" data-score="506" data-position-on-page="1" data-highest-scored="1" data-question-has-accepted-highest-score="1" itemprop="suggestedAnswer" itemscope="" itemtype="https://schema.org/Answer"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container d-flex jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="7"> <button class="js-vote-up-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Up vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-dgvag2l3"> <svg aria-hidden="true" class="svg-icon iconArrowUpLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 25h32L18 9 2 25Z"></path></svg> </button><div id="--stacks-s-tooltip-dgvag2l3" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This answer is useful<div class="s-popover--arrow"></div></div> <div class="js-vote-count flex--item d-flex fd-column ai-center fc-black-500 fs-title" itemprop="upvoteCount" data-value="13"> 13 </div> <button class="js-vote-down-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Down vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-gn8ppsfv"> <svg aria-hidden="true" class="svg-icon iconArrowDownLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 11h32L18 27 2 11Z"></path></svg> </button> </div> </div> <div class="answercell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"> <p>试试<a href="http://pub.dartlang.org/packages/mustache" rel="nofollow">mustache ，一个</a><a href="http://mustache.github.com/mustache.5.html" rel="nofollow">mustache 模板</a>的 Dart 实现，一种广泛使用的模板语法，有多种语言的实现。</p> <p>这是一个例子：</p> <pre class="lang-dart prettyprint-override"><code>import 'package:mustache/mustache.dart'; main() { var source = '{{#names}}<div>{{lastname}}, {{firstname}}</div>{{/names}}'; var template = new Template(source); var output = template.renderString({'names': [ {'firstname': 'Greg', 'lastname': 'Lowe'}, {'firstname': 'Bob', 'lastname': 'Johnson'} ]}); print(output); } </code></pre> <p>Dart 团队目前专注于客户端开发，因此核心库中缺少许多基本的服务器端功能。但是看看<a href="http://pub.dartlang.org/" rel="nofollow">pub</a>，有许多社区维护的包可用。</p> <p>另请参阅这个类似的包：<a href="https://pub.dartlang.org/packages/mustache4dart" rel="nofollow">mustache4dart</a>。</p> </div> <div class="mt24"> <div class="user-action-time" style="color:#999;text-align:right;">于 2013-03-26T22:43:56.763 回答</div> </div> </div> </div> </div><a name="7"></a> <div id="answer-7" class="answer js-answer accepted-answer" data-answerid="7" data-parentid="4" data-score="506" data-position-on-page="1" data-highest-scored="1" data-question-has-accepted-highest-score="1" itemprop="suggestedAnswer" itemscope="" itemtype="https://schema.org/Answer"> <div class="post-layout"> <div class="votecell post-layout--left"> <div class="js-voting-container d-flex jc-center fd-column ai-stretch gs4 fc-black-200" data-post-id="7"> <button class="js-vote-up-btn flex--item s-btn s-btnunset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Up vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-dgvag2l3"> <svg aria-hidden="true" class="svg-icon iconArrowUpLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 25h32L18 9 2 25Z"></path></svg> </button><div id="--stacks-s-tooltip-dgvag2l3" class="s-popover s-popovertooltip pe-none" aria-hidden="true" role="tooltip">This answer is useful<div class="s-popover--arrow"></div></div> <div class="js-vote-count flex--item d-flex fd-column ai-center fc-black-500 fs-title" itemprop="upvoteCount" data-value="0"> 0 </div> <button class="js-vote-down-btn flex--item s-btn s-btn__unset c-pointer " data-controller="s-tooltip" data-s-tooltip-placement="right" aria-pressed="false" aria-label="Down vote" data-selected-classes="fc-theme-primary" data-unselected-classes="" aria-describedby="--stacks-s-tooltip-gn8ppsfv"> <svg aria-hidden="true" class="svg-icon iconArrowDownLg" width="36" height="36" viewBox="0 0 36 36"><path d="M2 11h32L18 27 2 11Z"></path></svg> </button> </div> </div> <div class="answercell post-layout--right"> <div class="s-prose js-post-body" itemprop="text"> <p>你可以试试<a href="https://pub.dev/packages/edart" rel="nofollow noreferrer">https://pub.dev/packages/edart</a>。<br> 嵌入式 Dart 模板引擎和编译器。将模板编译为 Dart 源代码。</p> <p>例子：</p> <p><code>products_index.html</code></p> <pre class="lang-html prettyprint-override"><code><%@ import uri="layout.html.g.dart" %> <%@ import uri="../models/product.dart" %> <%@ class extends="View" %> <%@ render params="List<Product> products, HttpRequest request" %> <p> Our cool products list </p> <ul class="w3-ul"> <% for (final product in products) { %> <li><%= product.name %> <%= product.price %></li><% } %> </ul> <% final layout = layout_html(); layout.title = 'Products'; layout.addTag(HtmlTag('meta', {'description': 'MegaSuperShop cool price list'})); layout.addBreadcrumb('Products', request.requestedUri.toString()); layout.render(out, request); %> </code></pre> <p>该模板将被编译成以下源代码：</p> <p><code>products_index.html.g.dart</code></p> <pre class="lang-dart prettyprint-override"><code>// ignore: unused_import import 'dart:convert'; import 'layout.html.g.dart'; import '../models/product.dart'; class products_index_html extends View { String render(List<Product> products, HttpRequest request) { final out = StringBuffer(); out.write('<p>\n'); out.write(' Our cool products list\n'); out.write('</p>\n'); out.write('<ul class="w3-ul">\n'); for (final product in products) { out.write(' <li>'); out.write(htmlEscape.convert('${product.name}')); out.write(' '); out.write(htmlEscape.convert('${product.price}')); out.write('</li>'); } out.write('</ul>\n'); final layout = layout_html(); layout.title = 'Products'; layout.addTag( HtmlTag('meta', {'description': 'MegaSuperShop cool price list'})); layout.addBreadcrumb('Products', request.requestedUri.toString()); layout.render(out, request); return out.toString(); } } </code></pre> <p>布局模板也很简单易懂。</p> <p><code>layout.html</code></p> <pre class="lang-html prettyprint-override"><code><%@ import uri="../html/layout.dart" %> <%@ import uri="breadcrumbs.html.g.dart" %> <%@ import uri="footer.html.g.dart" %> <%@ import uri="header.html.g.dart" %> <%@ import uri="nav.html.g.dart" %> <%@ export uri="../html/breadcrumb.dart" %> <%@ export uri="../html/html_utils.dart" %> <%@ export uri="../html/view.dart" %> <%@ class extends="Layout" %> <%@ render params="StringBuffer body, HttpRequest request, {int statusCode = 400}" %> <html> <head> <title><%= title %></title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css"> <% for (final tag in tags) { %> <%== tag %> <% } %> </head> <body> <%== header_html().render(title) %> <%== nav_html().render(request) %> <div class="w3-container"> <%== breadcrumbs_html().render(breadcrumbs) %> </div> <div class="w3-container"> <%== body %> </div> <%== footer_html().render() %> </body> </html> <% body.clear(); body.write(out); final response = request.response; response.headers.add('Content-Type', 'text/html; charset=utf-8'); response.statusCode = statusCode; response.write(out); %> </code></pre> <p>最后是 class 的源代码<code>Layout</code>。<br> 它可以是任何东西，也可能根本不是（这不是很方便）。</p> <pre class="lang-dart prettyprint-override"><code>import 'breadcrumb.dart'; import 'html_utils.dart'; export 'dart:io'; export '../site/site_links.dart'; export 'html_utils.dart'; class Layout { final breadcrumbs = <Breadcrumb>[]; final tags = <HtmlTag>[]; String title = ''; void addBreadcrumb(String text, String url) { final item = Breadcrumb(text: text, url: url); breadcrumbs.add(item); } HtmlTag addTag(HtmlTag tag) { tags.add(tag); return tag; } } </code></pre> </div> <div class="mt24"> <div class="user-action-time" style="color:#999;text-align:right;">于 2020-10-18T15:44:25.957 回答</div> </div> </div> </div> </div></div> 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