Hey there! Great question—Handlebars doesn’t come with built-in else if syntax out of the box, and you can’t directly write expressions like value == 124 in templates either. But don’t worry, we’ve got a couple of solid ways to replicate that multi-condition logic you need. Let’s walk through them with your exact example.

Approach 1: Nested {{#if}} with Comparison Helpers #

First, you’ll need a way to compare values in Handlebars. Since native Handlebars doesn’t include equality checks by default, start by registering a simple eq helper to compare two values:

// Register an equality helper for value comparisons
Handlebars.registerHelper('eq', function(a, b) {
  return a === b; // Use == if you need loose equality instead of strict
});

Now you can nest {{#if}} blocks to mimic else if behavior. Here’s how to rewrite your JavaScript example:

{{#if (eq value 124)}}
  This is red
{{else}}
  {{#if (eq value 150)}}
    This is blue
  {{else}}
    No color selected
  {{/if}}
{{/if}}

This works perfectly for a small number of conditions, though it can get clunky if you have more than 2-3 cases.

Approach 2: Custom Multi-Condition Helper (Cleaner for Many Cases) #

For a more scalable solution, create a custom helper that handles the entire condition chain in one go. Let’s make a switchCase helper that acts like JavaScript’s switch statement:

Handlebars.registerHelper('switchCase', function(value, options) {
  // Loop through the provided case-value pairs
  for (const caseKey in options.hash) {
    // Convert key to number if your value is numeric (adjust for strings if needed)
    const caseValue = parseInt(caseKey, 10);
    if (caseValue === value) {
      return options.hash[caseKey];
    }
  }
  // Fallback to the default content if no matches are found
  return options.fn(this);
});

Now use it in your template like this—super clean and easy to extend with more conditions later:

{{#switchCase value 124="This is red" 150="This is blue"}}
  No color selected
{{/switchCase}}

Alternatively, if you prefer a structure closer to explicit if/else if, you can make an ifElseChain helper:

Handlebars.registerHelper('ifElseChain', function(...args) {
  // The last argument is the default result
  const defaultResult = args.pop();
  // Iterate through condition-result pairs
  for (let i = 0; i < args.length; i += 2) {
    const condition = args[i];
    const result = args[i + 1];
    if (condition) {
      return result;
    }
  }
  return defaultResult;
});

Template usage:

{{ifElseChain (eq value 124) "This is red" (eq value 150) "This is blue" "No color selected"}}

Quick Note: Third-Party Helpers #

If you don’t want to write custom helpers from scratch, you can use a package like handlebars-helpers which includes pre-built comparison helpers (like eq, gt, lt) and even conditional helpers that simplify multi-case logic. Just install it and register the helpers in your project!

内容的提问来源于stack exchange，提问作者Harish