将变量从javascript传递给ejs [英] Pass a variable from javascript to ejs

问题描述

我想使用在javascript文件中声明的变量到ejs文件。

I want to use a variable which is declared in javascript file to a ejs file.

javascript：

javascript:

var express = require('express');
var app = express();

var myVar = 1;

在ejs文件中，我想在几个if语句中使用该变量，我必须再次声明它以便能够使用它。

In the ejs file , where I want to use that variable inside a few if statements ,I have to declare it again in order to be able to use it.

ejs file：

var myVar = 1;
if ( my Var ) ....

我怎样才能避免这种情况？或者是有没有办法创建一个可以从javascript和ejs访问的配置文件？

How can I avoid this?Or is there a way for creating a configuration file which is accesible from both javascript and ejs?

我还尝试使用：

app.locals.myVar = 1

但在ejs文件中未定义。

but it is undefined in the ejs file.

-------更新--------------------------

------- UPDATE --------------------------

在我使用的代码中：

app.get('/', function (req, res) {
    res.render('index', { user : req.user, message: [] });

});

：

app.get('/', function (req, res) {

   res.render('index', { user : req.user, message: [] });
   res.render('user_info.ejs');

} ）;

即使代码运行正常，我也收到：

and even though the code runs fine , I am receiving:

ReferenceError: ....user_info.ejs:18

 >> 18|            height:60px;


user is not defined
    at eval (eval at <anonymous> (...node_modules/ejs/lib/ejs.js:464:12), <anonymous>:20:12)

    at returnedFn (...node_modules/ejs/lib/ejs.js:493:17)
    at View.exports.renderFile [as engine] (.../node_modules/ejs/lib/ejs.js:350:31)
   .....

哪个没有，因为我说代码运行正常。如果我运行它而没有添加第二个 res.render（'user_info.ejs）我没有收到错误。

which doesn't make sence ,since as I said the code runs fine.And If I run it without the addition of the second res.render('user_info.ejs) I receive no errors.

那么，我可以有两个res.render语句吗？

So, can I have two res.render statements?

推荐答案

这是一个关于如何使用 app.locals 将变量暴露给（EJS）模板的一个非常简单的例子：

Here's a very simple example on how app.locals can be used to expose variables to (EJS) templates:

// app.js
var express = require('express');
var app     = express();
var server  = app.listen(3000);

app.locals.myVar = 1;

app.get('/', function(req, res) {
  res.render('index.ejs');
});

// views/index.ejs
<% if (myVar) { %>
  <h1>myVar is here!</h1>
<% } else { %>
  <h1>Boohiss no myVar!</h1>
<% } %>

这篇关于将变量从javascript传递给ejs的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！