ember-reactive-helpers

ember-reactive-helpers

Collection of helpers to aid in reactive template programming with Ember.js.

Introduction

Reactive helpers are helpers that return functions. These functions can be bound to event handlers to process data on the way up in the Data Down Actions Up cycle. r helper makes it possible to use ember-composable-helpers in event handlers where execution of the helper is delayed until event is triggered.

Helpers

(r helper [arg1 arg2 ...])

Returns a function for a given helper and curry arguments to it.

<input value={{value}} oninput={{action (pipe (r 'dasherize') (action (mut value))) value="target.value"}}

r helper accepts functions as helpers. For example, lets say you have a method on the context called addNumbers

export default Ember.Component.extend({
  addNumbers([a, b]) {
    return a + b;
  }
});

You can use it in the template.

<button {{action (pipe (r addNumbers 1) (action (mut count))) count}}>+1</button>

(r/get propName)

(r/get) helper returns a function. When called, the function will return value taken from object that it receives as first argument at property propName.

{{compute (r/get 'animal') (hash animal='cat')}} {{! //=> cat }}

(r/param [index])

(r/param) return a function. When called, this function will return received argument at specified index.

{{compute (r/param) 'hello' 'world'}} {{! //=> 'hello'}}
{{compute (r/param 1) 'hello' 'world'}} {{! //=> 'world'}}

(r/debugger)

(r/debugger) will create a helper that will inject a debugger breakpoint into a helper pipe. It will pass through the value, that's passed into the helper.

<button {{action (pipe (some-helper) (r/debugger) (some-other-helper))}}>Do!</button>

(r/log ['your message'])

(r/log) helper will evaluate to a function. When called, this function will log the passed in messsage and arguments that it received.

<button {{action (pipe (r/log 'before save') (action 'save') (r/log 'after save')) model}}>Save</button>

(r/tap value)

(r/tap value) helper will evaluate to a function that'll return the passed in argument.

{{shhh anything}}

{{shhh helper will supress any output that's passed into it. This is useful when you want to compute a helper without having it's output rendered.

(transition-to 'destination' model (query-params foo='bar'))

(transition-to) helper the same argument signature as link-to but evaluates to an action that can be called to trigger transition.

<button {{action (transition-to 'index')}}>Go to Index</button>

(throttle action wait [immediate])

(throttle) helper will ensure that the action is only triggered once per given wait period. The action will be triggered at the end of the wait period unless immidate is set to true.

<button {{action (throttle (action 'increment') 100)}}>+1</button>

(debounce action wait [immediate])

(debounce) helper waits for specified time to pass before triggering callback. All intemidiate events are discarded.

<button {{action (debounce (pipe (r 'add' 1) (action (mut count)) ) 100) count}}>+1</button>

Installation

ember install ember-reactive-helpers

Helpful Links

• Live Demo

• Changelog

Looking for help?

If it is a bug please open an issue on GitHub.

Usage