How can I comment the EJS code (JS node) without getting an error

Question

I have this code in an EJS file:

<table>
<% for(var i=0; i < data.length; i++) { %>
   <tr>
     <td><%= data[i].id %></td>
     <td><%= data[i].name %></td>
   </tr>
<% } %>
</table>

When I comment it this way,

<!-- <table> -->
<!-- <% for(var i=0; i < data.length; i++) { %> -->
<!--    <tr> -->
<!--      <td><%= data[i].id %></td> -->
<!--      <td><%= data[i].name %></td> -->
<!--    </tr> -->
<!-- <% } %> -->
<!-- </table> -->

I still have an error in Line 2. Here is the stack of the error:

ReferenceError: c:\Users\toumi\Desktop\workspaces\eclipse\ToDoList\views\x.ejs:2
   1| <!-- <table> -->
>> 2| <!-- <% for(var i=0; i < data.length; i++) { %> -->
   3| <!--    <tr> -->
   4| <!--      <td><%= data[i].id %></td> -->
   5| <!--      <td><%= data[i].name %></td> -->

data is not defined
   at eval (eval at <anonymous> (c:\Users\toumi\Desktop\workspaces\eclipse\ToDoList\node_modules\ejs\lib\ejs.js:455:12), <anonymous>:11:25)
   at c:\Users\toumi\Desktop\workspaces\eclipse\ToDoList\node_modules\ejs\lib\ejs.js:482:14
   at View.exports.renderFile [as engine] (c:\Users\toumi\Desktop\workspaces\eclipse\ToDoList\node_modules\ejs\lib\ejs.js:348:31)
   at View.render (c:\Users\toumi\Desktop\workspaces\eclipse\ToDoList\node_modules\express\lib\view.js:93:8)
   at EventEmitter.app.render (c:\Users\toumi\Desktop\workspaces\eclipse\ToDoList\node_modules\express\lib\application.js:566:10)
   at ServerResponse.res.render (c:\Users\toumi\Desktop\workspaces\eclipse\ToDoList\node_modules\express\lib\response.js:938:7)
   at c:\Users\toumi\Desktop\workspaces\eclipse\ToDoList\todoList.js:13:6
   at Layer.handle [as handle_request] (c:\Users\toumi\Desktop\workspaces\eclipse\ToDoList\node_modules\express\lib\router\layer.js:82:5)
   at next (c:\Users\toumi\Desktop\workspaces\eclipse\ToDoList\node_modules\express\lib\router\route.js:110:13)
   at Route.dispatch (c:\Users\toumi\Desktop\workspaces\eclipse\ToDoList\node_modules\express\lib\router\route.js:91:3)

How can I comment this code?

Please add what error you are receiving. I tried adding in ejs and i am not receiving any error. — vishal patel, Mar 21 '15 at 08:51

score 45 · Answer 1 · edited Feb 04 '22 at 16:35

45

There is two solutions:

<%# comment %> (it's from documentation)
<%/* comment */%> (it works too, but it's pretty ugly and uncomfortable for use)

I don't see a difference between those examples except highlighting syntax in an IDE (example with the Brackets IDE).

edited Feb 04 '22 at 16:35

Peter Mortensen

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answered Oct 04 '16 at 08:41

Kas Elvirov

7,394
4
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score 33 · Answer 2 · answered Mar 18 '17 at 06:04

33

Sample of the <% /* */ %> format for multi-line.

<% /* %>
<div>
    <span>This will not be rendered</span>
    <% for(var i=0; i < data.length; i++) { %>
      <span>These won't be rendered either.</span>
    <% } %>
</div>
<% */ %>

answered Mar 18 '17 at 06:04

Quang Van

11,475
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2

This is the good answer to the question. The questioner clearly needed multiline comment with ejs tags inside that, and neither <%# ... %> nor <% /* ... */ %> (in this exact form) doesn't work in that case. – Herbertusz Aug 08 '18 at 14:32
it's not working when there's variable <%= var %> inside it – Ivan Kolyhalov Mar 27 '20 at 09:10

score 10 · Answer 3 · edited Feb 04 '22 at 16:33

10

It says here about the comments as well that you can comment like below:

 <%# code %>

edited Feb 04 '22 at 16:33

Peter Mortensen

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105
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answered Mar 21 '15 at 08:21

A.B

20,110
3
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score 9 · Answer 4 · edited Feb 04 '22 at 16:37

9

There are two ways to do it!

As mentioned in the documentation of EJS:

<%# commented out code %>

<%/* multiple lines commented out code*/%>

For example:

<%# include('includes/head.ejs') %>
</head>

<body>
    <%# include('includes/navigation.ejs') %>
    <h1>Page Not Found!</h1>

<%- include('includes/end.ejs') %>

edited Feb 04 '22 at 16:37

Peter Mortensen

30,738
21
105
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answered Jan 08 '19 at 17:42

Abhishek Gautam

1,617
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score 5 · Answer 5 · answered Dec 18 '16 at 19:37

I found this helpful for me. It's simple, multiline and does not conflict with anything.

    <%if(false) {%>  
        <ul>
        <% for(var i =1; i <= 10; i++) { %>
            <li>
                Hello this is iteraiton <%=i %>
            </li>
        <% }%>
        </ul>
        <%- include('./meow') %> 
    <%} %>

How can I comment the EJS code (JS node) without getting an error

5 Answers5

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