Pass array written in template to meteor/handlebars helper

Question

I have a helper called printArray that just prints every item in an array. It works great when I define the array in JS and pass it in to the helper via a context object. What I want to do is define the array right in the template, like:

{{printArray arr=[1, 3, 4] }} 

Unfortunately, by the time this gets to my helper, the arr key points to undefined. Is there any valid syntax to get the array inside my helper without defining it in javascript?

Answer 1

You can use JavaScript's arguments array to accomplish something like this. The arguments array gives you access to every value passed to the function when it is called.

This will allow you to use syntax like this:

{{printArray 1 3 4}} 

The code looks like this:

Handlebars.registerHelper('printArray', function() {     //Last argument is the options object.     var options = arguments[arguments.length - 1];      //Skip the last argument.     for(var i = 0; i < arguments.length - 1; ++i) {         //Do your thing with each array element.     }      //Return your results...     return ''; });