Tips for adding/removing items in arrays using Ember.js

Is it possible to modify an array within an Ember object using methods like push and pop while still keeping the UI bindings updated? While I can easily display the contents of an array in an Ember object using Handlebars, making changes directly to the array seems to be a bit more challenging. How can this be achieved?

// JS
App.obj = Ember.Object.create({
    "things": ["1", "2"],
});
App.obj.set("things", ["1", "2", "3"]); // Works
App.obj.things.push("3"); // Doesn't Work

// HTML + Handlebars
{{#with App.obj}}
    <ul>
    {{#each things}}
        <li>{{this}}</li>
    {{/each}}
    </ul>
{{/with}}

Answer №1

If you're looking to manipulate collections in Ember.js, consider utilizing the Array wrapper classes provided by Ember.js - Ember.Array and Ember.MutableArray.

Instead of simply working with plain arrays, opt for these alternatives:

// JavaScript
App.object = Ember.Object.create({
    "items": Ember.A(["1", "2"])
});
App.object.items.pushObject("3"); // pushObject will inform observers

// HTML + Handlebars
{{#with App.object}}
    <ul>
    {{#each items}}
        <li>{{this}}</li>
    {{/each}}
    </ul>
{{/with}}

Answer №2

To utilize an instance of Ember.ArrayController, you can simply create an array using [], which also generates an array of the Ember.ArrayController class.

If you wish to append an Object at the end of the Ember ArrayController, you can make use of the addObject() method;

For example:

mutableArray:[],

setModel:function(){

var data1={'id':1,'name':'over'};
var data2={'id':3,'name':'out'};

this.get('mutableArray').addObject(data1);
this.get('mutableArray').addObject(data2);

/* To insert an Object in the middle of the array at a specified index, simply employ the native array splice method */

var data1={'id':2,'name':'and'}
this.get('mutableArray').splice(1,0,data1);

return this.get('mutableArray')

}.property('mutableArray')

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