Can Logical Operators be Used in Handlebars.js Conditional Statements?

Logical Operators in Handlebars.js Conditional Statements

In Handlebars.js, the standard conditional operator, {{#if}}, only accepts a single boolean condition. However, developers often need to incorporate logical operators (AND, OR) into their conditional statements. Let's explore if this is achievable within Handlebars.js.

Loopholes with Block Helpers

Although there's no direct way to use logical operators in {{#if}}, a workaround can be employed using block helpers. By registering a custom helper, developers can essentially create a block that emulates the behavior of logical operators.

For instance, to implement an OR operator, we can define a helper as follows:

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

This helper can then be utilized in the template as:

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

By calling this helper with appropriate parameters, developers can simulate the OR operator's behavior. However, it's important to note that this is a workaround and may not fully comply with the philosophy behind Handlebars' templating engine.

The above is the detailed content of Can Logical Operators be Used in Handlebars.js Conditional Statements?. For more information, please follow other related articles on the PHP Chinese website!