https://github.com/thefrontside/ember-let

Create variable bindings inside your handlebars templates
https://github.com/thefrontside/ember-let

binding ember ember-addon emberjs functional-programming handlebars javascript

Last synced: about 1 month ago
JSON representation

Create variable bindings inside your handlebars templates

• Host: GitHub
• URL: https://github.com/thefrontside/ember-let
• Owner: thefrontside
• License: mit
• Created: 2016-07-13T12:38:49.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2018-11-07T15:06:49.000Z (about 6 years ago)
• Last Synced: 2024-09-21T09:12:00.817Z (2 months ago)
• Topics: binding, ember, ember-addon, emberjs, functional-programming, handlebars, javascript
• Language: JavaScript
• Homepage:
• Size: 142 KB
• Stars: 52
• Watchers: 11
• Forks: 16
• Open Issues: 11
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE.md
  • Code of conduct: CODE_OF_CONDUCT.md

Awesome Lists containing this project

README

        
# ember-let

[![npm version](https://badge.fury.io/js/ember-let.svg)](https://badge.fury.io/js/ember-let)

[![Ember Observer Score](https://emberobserver.com/badges/ember-let.svg)](https://emberobserver.com/addons/ember-let)

[![Build Status](https://travis-ci.org/thefrontside/ember-let.svg?branch=master)](https://travis-ci.org/thefrontside/ember-let)

`ember-let` is an addon for binding variables to template contexts in Ember. It behaves much like the `with` helper, but lets you bind an arbitrary number of variables, including standalone values, hashes, and class instances. However, unlike `with`, the `let` helper will yield its block even if the bound values are `undefined`, `null`, or `[]`. This has the benefit of allowing the user to treat the block values as true variable bindings rather than simply aliases to existing values.

See examples below:

**Bind basic values**

```hbs

{{#let "abc" "123" as |first second|}}

  
{{first}}

  
{{second}}

{{/let}}

```


**Mix hashes and standalone values**

```hbs

{{#let (hash first="first" second="second") "third" as |hash standalone|}}

  
{{hash.first}}

  
{{hash.second}}

  
{{standalone}}

{{/let}}

```


**Bind a class instance returned from a helper**

```hbs

{{#let (boolean) as |bool|}}

  {{bool.value}} - toggle

{{/let}}

```

**Inline use**

Note: requires Ember 2.0+ (ie. does not support 1.13)

```hbs

{{let greeting=(concat "hello " to)}}

{{greeting}} - Greet the world!  

```

Inline let declarations are in scope until the parent element or block is closed, for example:

```hbs

{{#if person.isActive}}

  


    {{let name=person.name}}

    {{name}}

  

  {{!-- The name binding is not accessible here... --}}

{{/if}}

{{!-- ...or here. -- }}

```


## Installation

* `git clone` this repository

* `npm install`

* `bower install`

## Running

* `ember server`

* Visit your app at http://localhost:4200.

## Running Tests

* `npm test` (Runs `ember try:testall` to test your addon against multiple Ember versions)

* `ember test`

* `ember test --server`

## Building

* `ember build`

For more information on using ember-cli, visit [http://ember-cli.com/](http://ember-cli.com/).

## Code of Conduct

Please note that this project is released with a Contributor Code of

Conduct. By participating in this project you agree to abide by its

terms, which can be found in the `CODE_OF_CONDUCT.md` file in this

repository.