Want to compare two string in handlebars view in node js app

Question

I want to do some comparisons in a handlebars template in an express-nodejs app.

It looks something like this:

{{# if(x==y)}}
    equal string
 {{else}}
    not equal string
 {{/if}}

I already installed the handlebars and express-handlebars packages. I read about the handlebars helpers but couldn't figure out a way to use them properly. I tried to add the helpers in the app.js file in my app, but I couldn't use them in my template file in view.

Any help would be helpful and appreciated.

Thanks

Hadrien TOMA · Accepted Answer · 2016-12-04 08:51:10Z

3

You can use the is function like this :

 {{#is x "my_string"}}
     x is "my_string"
 {{else}}
     x isn't "my_string"
 {{/is}}

Otherwise, you can use this famous helper :

Handlebars.registerHelper('if_equal', function(a, b, opts) {
    if (a == b) {
        return opts.fn(this)
    } else {
        return opts.inverse(this)
    }
})

And use it like this :

{{#if_equal x "my_string"}}
     x is "my_string"
{{else}}
     x isn't "my_string"
{{/if_equal}}

edited Dec 4, 2016 at 8:51

answered Dec 4, 2016 at 8:45

Hadrien TOMA

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10 Comments

Rahul Mangal Over a year ago

Thanks @hardrien for helping me. Where do i put the registerHelper either in app.js or router js file(index.js)

Hadrien TOMA Over a year ago

Wherever you want in a JavaScript that will be executed client side ;) (but after loading the handlebar.js library)

Rahul Mangal Over a year ago

you mean i should put the Handlebars.registerHelper('if_equal', function(a, b, opts){..........} in template file?

Hadrien TOMA Over a year ago

Only just after the script that loads handlebar.js.

Rahul Mangal Over a year ago

TypeError: expressHbs.registerHelper is not a function at Object.<anonymous> (F:\xampp\htdocs\node-todo\app.js:29:12) at Module._compile (module.js:556:32) at Object.Module._extensions..js (module.js:565:10) at Module.load (module.js:473:32) at tryModuleLoad (module.js:432:12) at Function.Module._load (module.js:424:3) at Module.require (module.js:483:17) at require (internal/module.js:20:19) ..................... ......................... [nodemon] app crashed - waiting for file changes before starting...

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