95

How can you delete a property/key from a Vue.js data object (i.e. associative array) like this:

var vm = new Vue({
    data: {
        users: {
            foo : { firstName: ..., lastName: ... },
            bar : { firstName: ..., lastName: ... }
        }
    },
    methods: {
        someFunction : function ()
        {
            // how to remove `users.foo`?
        }
    }
});

Googling around, I found these two ways, but both don't work:

  • delete this.users.foo; is not updating the DOM
  • this.users.splice('foo', 1); is not working at all (probably only works on arrays, not on objects)
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1
  • I believe vue2 implements its own splice for array. Wouldn't work on objects though, as you say. Commented May 1, 2019 at 1:41

3 Answers 3

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187

The answer is:

Vue.delete(users, 'foo');

It took me a while to find it, that's why I'm posting it here ;-)
https://github.com/vuejs/vue/issues/3368#issuecomment-236642919

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3 Comments

Weirdly, it's not even described in the documentation: vuejs.org/v2/guide/reactivity.html#Change-Detection-Caveats. It just says "Vue cannot detect property addition or deletion" and doesn't explain how you're supposed to do it
@Migwell it seems to be mentioned here: vuejs.org/2016/02/06/common-gotchas
It's worth noting that if you want to add a property to an object, the analogue is Vue.set.
108

It's important to know that vm.$delete is a alias for Vue.delete and if you try something like this.delete() you will get a error. So in your example the answer would be:

this.$delete(this.users, 'foo')

or

vm.$delete(vm.users, 'foo')

https://v2.vuejs.org/v2/guide/migration.html#vm-delete-changed

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1 Comment

Thank you very much.It's acutally a correct answer. It can solve the VUEJS problem which cannot watch data removed from or added to.
4

You have to create a new copy of the object so Vue be able to know that there are changes:

ES6

const users = { ...this.users };
delete users['foo'];
this.users = users

or without spread operator it would be 

const users = Object.assign({}, this.users);
delete users['foo'];
this.users = users
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1 Comment

using Vue.delete is preferable to this solution since it doesn't involve creating a whole new object as it is done here

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