获取ejs模板中的url参数 [英] Getting the url parameters in an ejs template

问题描述

我正在尝试基于URL参数创建一个ejs条件，例如，如果测试参数存在于localhost：3000 / page？test，那么显示一个div，否则不显示它。

I am trying to create an ejs conditional based on a URL parameter, for example, if the test parameter exists at localhost:3000/page?test, then show a div, else dont show it.

我的ejs模板类似于：

My ejs template looks something like:

<% include header %>
<div class="row">
<%if (title !== "homepage") {%>
<%= title %>
  <div>
    <% include nav %>
  </div>
<%}%>
  <div>
  </div>
</div>
<% include footer %>

有没有办法直接从ejs文件访问URL参数？例如，<％= title％>工作正常，是否有<％= req.query％>？

Is there a way to access the URL parameters directly from the ejs file? For example, the <%= title %> works fine, is there something like <%= req.query %>?

我也在使用快递。

推荐答案

你可以通过它很容易作为第二个参数中的对象 render（）

You can pass it easily as an object in the second argument to render()

app.get('/someurl', function(req, res, next) {
   res.render('filename', {query : req.query});
});

您还可以使用本地人变量

app.get('/someurl', function(req, res, next) {
   res.locals.query = req.query;
   res.render('filename');
});

当与在所有其他路线之前运行的一般路线一起使用时非常有用，使得变量以下所有路线均可使用

which is very useful when used with a general route that runs before all the other routes, making the variable available in all the following routes

app.use(function(req, res, next) {
   res.locals.query = req.query;
   res.locals.url   = req.originalUrl;

   next();
});

并且它在您呈现为查询的文件中可用 etc

and it's available in the file you're rendering as query etc

<% if (query == "something") { %>
    <div id="crazy_shit">
        <a href="<%- url -%>">Here</a>
    </div>
<% } %>

作为旁注，如果查询原因没有定义，你会在EJS中因使用未定义的变量而出错，这可能很烦人。

As a sidenote, if query for some reason isn't defined, you'll get an error in EJS for using an undefined variable, which can be annoying.

我通常通过使用对象来解决这个问题，因为检查对象属性不会触发错误，并且很容易确保对象始终在顶部具有初始值每个EJS模板。

在路线中这样做

I usually solve this by using an object instead, as checking object properties does not trigger errors, and it's easy to make sure the object always has an initial value at the top of each EJS template.
It's done like this in the routes

app.user(function(req, res, next) {
   res.locals.stuff = {
       query : req.query,
       url   : req.originalUrl
   }

   next();
});

然后在模板中

<% stuff = typeof stuff !== 'object' ? {} : stuff %>

// later on

<% if ( stuff.query == "something") { %>//does not throw error if property not defined
    <div id="crazy_shit"></div>         
<% } %>

即使 stuff.query 已定义，条件只是失败并且它不会抛出错误，如果 stuff 本身或任何其他变量未被定义。

which even if stuff.query is defined, the condition just fail and it doesn't throw an error like it would if stuff itself, or any other variable, wasn't defined.

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