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up vote 1 down vote favorite

html

<div v-repeat=dudes>{{a}}, {{b}}</div>

js

dudes = [{a:1}, {a:2}, {a:3}]

new Vue({
  el: 'body',
  data: {dudes: dudes}
})
dudes[0].b = 'test'

Trying to set dudes[0].b = 'test' doesn't work.

http://jsbin.com/dogadutiqa/1/edit

Unless I define dudes with a b property to begin with dudes = [{a:1, b:null}, {a:2}, {a:3}]

How do I add new properties?

share|improve this question
up vote 2 down vote accepted

Due to the limitations of ES5, Vue cannot detect properties directly added to or deleted from an object.

You need to use $add method to declare the property, so that it could be watched. Also if you want to remove a property, you need $delete method.

share|improve this answer
    
I have an array of objects, not strings. So your example code doesn't really make sense. Also, you're kind of wrong, because if I do dudes[0].a = 'test' that works. (changing a instead of b) – Stephen Bugs Kamenar Apr 21 '15 at 3:06
    
@StephenBugsKamenar Well, I just noticed that I misunderstood your question. a is an existing proerty while b is not. You need $add to declare the property key first, so that it could be watched. Also call $delete if you want to remove a property. – Leo Apr 21 '15 at 3:35
    
I don't know how I missed that one in the docs. Makes sense, thanks! – Stephen Bugs Kamenar Apr 21 '15 at 4:00
    
this is not in the API, at least not anymore, therefor not a solution. – Kevin Compton Feb 3 at 0:06
    
@KevinCompton Per OP's question, if he hasn't updated vue.js, then it is the solution. It just may not be the solution for the latest version. – Leo Feb 3 at 2:02

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