如何在 Handlebars.js {{#if}} 條件中實作邏輯運算子？

Logical Operators in Handlebars.js {{#if}} Conditionals

In Handlebars.js, conditional statements using the {{#if}} helper allow you to conditionally render content based on a single condition. However, for more complex scenarios involving multiple conditions, you might wonder if there's a way to incorporate logical operators.

Using Block Helpers

While Handlebars.js doesn't natively support logical operators within its {{#if}} conditional, it's possible to achieve this functionality by creating a custom block helper.

Handlebars.registerHelper('ifCond', function(v1, v2, options) {
  if(v1 === v2) {
    return options.fn(this);
  }
  return options.inverse(this);
});

Utilizing the Block Helper

To use the custom ifCond helper, you can call it in your Handlebars template like this:

{{#ifCond v1 v2}}
    {{v1}} is equal to {{v2}}
{{else}}
    {{v1}} is not equal to {{v2}}
{{/ifCond}}

By utilizing this custom block helper, you can now evaluate logical conditions in your Handlebars conditionals, enabling you to control content rendering based on multiple criteria.

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