spacebars: how to use and / or in if statements

I have following code:

 <div class="form-group {{#if afFieldIsInvalid name='latitude' OR name='longitude'}}has-error{{/if}}">......</div>

How can I use AND/OR in if conditions of spacebars templates ?

Spacebars is an extension of Handlebars, which is designed to be a logic-less template language.

The solution is to register a helper. For the general case, see these similar questions:

• How to do IF logic in HandleBars templates?

• Include conditional logic in Handlebars templates, or just use javascript?

• boolean logic within a handlebars template

To define helpers in Meteor, use Template.registerHelper