javascript - Using indexOf in Jade - Stack Overflow

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Working with Jade & Express here.

'#{value.users}' is an array.

'#{user.username}' is a string.

Trying to do if '#{value.users}'.indexOf('#{user.username}')

If true, then I display a bunch of stuff, otherwise, shouldn't be rendered.

Jade is ok with the syntax, but even when #{value.users}'.indexOf('#{user.username}') is falsy, the content within the if statement is being rendered.

For instance, if user.username = bob, and value.users = ['tim', 'billy'], the if statement is passing, when it clearly shouldn't be.

What am I doing wrong?

Working with Jade & Express here.

'#{value.users}' is an array.

'#{user.username}' is a string.

Trying to do if '#{value.users}'.indexOf('#{user.username}')

If true, then I display a bunch of stuff, otherwise, shouldn't be rendered.

Jade is ok with the syntax, but even when #{value.users}'.indexOf('#{user.username}') is falsy, the content within the if statement is being rendered.

For instance, if user.username = bob, and value.users = ['tim', 'billy'], the if statement is passing, when it clearly shouldn't be.

What am I doing wrong?

• javascript
• node.js
• express
• pug

Share Improve this question Follow edited Feb 10, 2014 at 11:57 Mike Causer 8,32422 gold badges4646 silver badges6363 bronze badges asked Feb 26, 2013 at 19:58 Jacques TardieJacques Tardie 59522 gold badges1010 silver badges1616 bronze badges 1

• Check what ['tim', 'billy'].indexOf('bob') yields: -1. Not a falsy value (0) – Bergi Commented Feb 26, 2013 at 20:38

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2 Answers 2

Sorted by: Reset to default 6

Shouldn't it be #{value.users.indexOf(user.username)}?

Any js mands inside #{} is executed. You should be able to fit your entire expression inside a single '#{}'

By saying if '#{value.users}'.indexOf('#{user.username}') the '#{value.users}' is being serialised into a string and when using .indexOf() it's searching within the string, rather than original array.

If you are using it in an if statement, why not just execute the js directly? eg.

- if ( value.users.indexOf(user.username) )
    p some jade
- else
    p alternate jade

https://github./visionmedia/jade#a8

Alternatively, you could use the underscore library.

http://underscorejs/#indexOf

If you want to use it inside Jade templates, be sure to require() it in your app or request locals.

I am not familiar with Jade, but wouldn't you need to test against != -1 or == 1?

 str.indexOf('#{user.username}') ! = -1

or since you are testing against an array, something along the lines of.

 array.toString().indexOf('#{user.username}') != -1

UPDATE: With the advent of ES6, I updated a little below

 array.includes('#{user.username}') // returns true or false
 str.includes('#{user.username}') // returns true or false

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