Handlebars useful helpers

handlebars-helpers.js

Handlebars.registerHelper('grouped_each', function(every, context, options) {
    var out = "", subcontext = [], i;
    if (context && context.length > 0) {
        for (i = 0; i < context.length; i++) {
            if (i > 0 && i % every === 0) {
                out += options.fn(subcontext);
                subcontext = [];
            }
            subcontext.push(context[i]);
        }
        out += options.fn(subcontext);
    }
    return out;
});

Handlebars.registerHelper("debug", function(optionalValue) {
    console.log("\nCurrent Context");
    console.log("====================");
    console.log(this);

    if (arguments.length > 1) {
        console.log("Value");
        console.log("====================");
        console.log(optionalValue);
    }
});

Handlebars.registerHelper('if_eq', function(a, b, opts) {
    if(a == b) // Or === depending on your needs
        return opts.fn(this);
    else
        return opts.inverse(this);
});

Handlebars.registerHelper('return_object_item', function(obj, field, key) {
    var result = $.grep(obj, function(e){ return e.pais == field; });

    return result[0][key];
});

Handlebars.registerHelper('if_odd', function(conditional, options) {
    if((conditional % 2) != 0) {
        return options.fn(this);
    } else {
        return options.inverse(this);
    }
});

Handlebars.registerHelper("inc", function(value, options)
{
    return parseInt(value) + 1;
});

Handlebars.registerHelper('toLowerCase', function(str) {
    return str.toLowerCase();
});

Handlebars.registerHelper('toSelector', function(str) {
    return str.split(' ').join('-');
});

//  format an ISO date using Moment.js
//  http://momentjs.com/
//  moment syntax example: moment(Date("2011-07-18T15:50:52")).format("MMMM YYYY")
//  usage: {{dateFormat creation_date format="MMMM YYYY"}}
Handlebars.registerHelper('dateFormat', function(context, block) {
    if (window.moment) {
        var f = block.hash.format || "MMM Do, YYYY";
        return moment(context).format(f);
    }else{
        return context;   //  moment plugin not available. return data as is.
    };
});