ember-concurrency-ajax

ember-concurrency-ajax provides a service for you to manage your ajax requests. You can also trigger ajax request via helpers.

The addon is backed by ember-concurrency, a generator function based task scheduler.

Usage

Send request in controllers

//controller.js

export default Controller.extend({
  ecajax: Ember.inject.service(),

  slice: task(function* (beef) {
    console.log('slicing beef');
    return beef;
  }),

  pack: task(function* (beef) {
    console.log('packing beef');
  }),

  actions: {
    request() {
      let ecajax = this.get('ecajax');

      // every request returns a TaskInstance
      let beef = ecajax.request('/api/v1/beef').catch(err => console.log('error!;));

      // concat the taskInstances and tasks
      ecajax.concat(beef, slice, pack);
    }
  }
})

or

Send request in templates (It's working well with ember-composable-helpers)

<button onclick={{pipe
      (request '/test.json') 
      (action 'process')
    }}>
  request: default
</button> 

Create Tasks

You can create task with a task name and an optional concurrency policy. Here is the API.

import Ember from 'ember';

export default Ember.Controller.extend({
  ecajax: Ember.inject.service(),

  init() {
    this._super(...arguments);
    let ecajax = this.get('ecajax');
    ecajax.createTask({ name: 'custom', policy: 'restartable' });
  }
});

Send Requests

Sending ajax is straight forward. In normal case, you don't have to worry about creating task. It has a built-in task for normal ajax requests.

import Ember from 'ember';

export default Ember.Controller.extend({
  ecajax: inject.service(),

  actions:{
    request() {
      let ecajax = this.get('ecajax');
      let ajaxOptions = {}; // the jquery ajax options
      
      // returns a taskInstance
      ecajax.request('/api/v1/foo', ajaxOptions);
    }
  }
});

Cancel Tasks

You can use ember-concurrency's cancel-all helper to cancel your tasks. get-task is a helper to get the task in the service.

<button 
  onclick={{cancel-all (get-task 'mytask')}}>
  cancel
</button>

Show Running Status

{{#with (get-task 'mytask') as |task|}}
  {{#if task.isRunning}}
    Loading...
  {{else}}
    task.last.value
  {{/if}}
{{/with}}

API

ecajax service

• request(url, options, name) Send ajax request.
  • url: The URL to access
  • options: settings for jQuery ajax
  • name: task name
• task(name) Get concurrency task by task name.
  • name: the task name in service
• createTask(options) create concurrency task
  • options.name: task name
  • options.policy (optional): concurrency policy - restartable drop enqueue keepLast or empty
  • options.maxConcurrency (optional): max concurrency for the task

helpers

• request

Request with the URL and task name (optional), and you can pass in jQuery options as well.

<button onclick=(request '/api/v1/foo' options name='mytask')>
  request
</button>

• get-task

Get the task with a name in the service.

<button
  onclick={{cancel-all (get-task 'mytask')}}>
  cancel mytask
</button>

utils

• concatTasks

Concatenate Task or TaskInstance in a row.

import Ember from 'ember';
import { task } from 'ember-concurrency';
import { concatTasks } from 'ember-concurrency-ajax/utils';

export default Ember.Controller.extend({
  ecajax: inject.service(),
  tasks: computed.alias('ecajax.tasks'),
  result: Ember.A(),
  concatTasks: concatTasks,

  slice: task(function* (val) {
    yield console.log('slicing beef', val);
    return val;
  }),

  pack: task(function* (val) {
    yield console.log('packing beef', val);
  }),

  init() {
    this._super(...arguments);
    let ecajax = this.get('ecajax');
    
    this.get('concatTasks').perform(
      ecajax.request('/beef.json'), 
      this.get('slice'),
      this.get('pack')
    );
  },
});