javascript - Handlbars JS : evaluating expression with dynamic keys

Question

I have object as follows

myObject = {
     id:1234,
     name_1234:"abc"
}

using the handlebars JS i am trying to evaluate the expression with dynamic keys in place, for example the id is generated dynamically so the keys will change dynamically

therefore the expression below

{{"myObject.name_"+myObject.id}}

should return the output "abc".

Is something like this achievable in handlebars JS ?

question from:https://stackoverflow.com/questions/65932471/handlbars-js-evaluating-expression-with-dynamic-keys

Answer 1

Handlebars will not allow you to concatenate strings within a template using the + operator. You will need to create a Helper to do that. Once you have that, you can combine it with the lookup helper using a subexpression to perform the lookup:

Handlebars.registerHelper('concat', function (...args) {
    return args.slice(0, -1).join('');
});

{{lookup myObject (concat "name_" myObject.id)}}

I have created a fiddle for your reference.