EJS tags in javascript code

Question

I'm using Node.js and ejs for templating language.

I feel like this is really silly and I should be able to solve it, but I'm stuck.

I am having trouble with the following function:

// Returns true if campground has been posted by currently logged on user
// If no user logged on, returns false
function checkIfCampgroundBelongsToUser(campgroundAuthorID) {
    var currentUser = <%-JSON.stringify(currentUser) %>
    if(currentUser && currentUser._id === campgroundAuthorID) { 
        return true;
    }
    return false;
}

This code works fine when a user is logged in. However, when no user is logged in evaluates to empty. Not empty string. Not null. Not undefined. Just empty. Thus, I get the following error

Uncaught SyntaxError: Unexpected token if

When I inspect via chrome dev tools, this is what I see

(yes I realize a semi-colon is missing, I added it... And when I do, I get uncaught syntaxError: Unexpected token ;)

You could try -> <%-currentUser ? JSON.stringify(currentUser) : "null" %> — Keith
– Keith, Commented Oct 26, 2017 at 22:11

skirtle · Accepted Answer · 2017-10-26 22:13:45Z

1

undefined will pass through JSON.stringify unchanged and EJS will render that as nothing. If you default it to null it'll be converted to the string "null", which EJS will render as null.

var currentUser = <%- JSON.stringify(currentUser || null) %>;

answered Oct 26, 2017 at 22:13

skirtle

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