Truly change a model attribute silently in Backbone.js?

Question

Is there a way I can change attributes on a model without ever firing a change event? If you pass {"silent":true} right now, the next time an attribute is changed, the silent change event will be triggered. Can I change an attribute safely without the change event ever being triggered?

from change, Backbone 0.9.2:

// Silent changes become pending changes.
for (var attr in this._silent) this._pending[attr] = true;

// Silent changes are triggered.
var changes = _.extend({}, options.changes, this._silent);
this._silent = {};
for (var attr in changes) {
    this.trigger('change:' + attr, this, this.get(attr), options);

score 11 · Answer 1 · answered Mar 22 '12 at 19:11

11

You can change model attributes directly using model.attributes['xyz'] = 123.

answered Mar 22 '12 at 19:11

abraham

46,583
10
100
152

Wow, that truly did it. So simple. – PanosJee Jan 09 '13 at 10:10
1

I've heard a couple of people advising to not touch the `attributes` variable. But it seems to do the job. Is there a real and pragmatic drawback in doing it that way? – cherouvim May 28 '15 at 07:49
@cherouvim I think the only drawback is exactly what we want - no events. – Mati Sep 08 '16 at 07:17
Take care if you set another object as an attribute. JSON.stringify() or toJSON() will produce different results. – enigma969 Jul 11 '17 at 09:13

score 5 · Accepted Answer · answered Mar 22 '12 at 20:12

5

I think the cleanest way if you really want to default to silent (but still be able to do silent:false) sets would be to override set. This should do it:

var SilentModel = Backbone.Model.extend({

    set: function(attrs, options) {
        options = options || {};
        if (!('silent' in options)) {
            options.silent = true;
        }
        return Backbone.Model.prototype.set.call(this, attrs, options);
    }
});

answered Mar 22 '12 at 20:12

ggozad

13,105
3
40
49

The problem of { silent: true } delaying the individual change:attr events is fixed in Backbone 0.9.10. – parliament Jul 28 '13 at 22:32

score 0 · Answer 3 · edited Jul 07 '17 at 14:30

0

item.set(
        {
           sum: sum
          ,income: income
       },
       {silent: true}
    );

since backbone 0.9.10

edited Jul 07 '17 at 14:30

Bugs

4,491
9
32
41

answered Jul 07 '17 at 14:03

Олег Беликов

117
2
9

Truly change a model attribute silently in Backbone.js?

3 Answers3

Linked