Comparison Helper for handlebars.js

comparehandlebars.js

// Comparison Helper for handlebars.js
// Pass in two values that you want and specify what the operator should be
// e.g. {{#compare val1 val2 operator="=="}}{{/compare}}

Handlebars.registerHelper('compare', function(lvalue, rvalue, options) {

	if (arguments.length < 3)
	    throw new Error("Handlerbars Helper 'compare' needs 2 parameters");

	operator = options.hash.operator || "==";

	var operators = {
	    '==':       function(l,r) { return l == r; },
	    '===':      function(l,r) { return l === r; },
	    '!=':       function(l,r) { return l != r; },
	    '<':        function(l,r) { return l < r; },
	    '>':        function(l,r) { return l > r; },
	    '<=':       function(l,r) { return l <= r; },
	    '>=':       function(l,r) { return l >= r; },
	    'typeof':   function(l,r) { return typeof l == r; }
	}

	if (!operators[operator])
	    throw new Error("Handlerbars Helper 'compare' doesn't know the operator "+operator);

	var result = operators[operator](lvalue,rvalue);

	if( result ) {
	    return options.fn(this);
	} else {
	    return options.inverse(this);
	}
});