VueJS $watch $refs

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Is it possible to $watch Vue $refs?

I'm wanting to set logic against a child component that is nested inside my current Vue instance but inside the ready callback, $refs.childcomponent is initially undefined while it's processed.

inside ready()

this.$watch('$refs', function() {
    console.log("not firing");
}, { deep: true });

Result: Error: Maximum call stack exceeded

watch property of the instance

watch: {
  '$refs': {
     handler: function() { console.log("hit"); },
     deep: true
  }
}

result: nothing.

You can $watch $refs.<name>.<data> but not $refs.<name> itself, not to mention $refs.

https://jsfiddle.net/kenberkeley/9pn1uqam/

const Counter = {
  data: () => ({
    i: 0
  }),
  template: `<fieldset>
    <p>Counter</p>
    <code>i = {{ i }}</code>
    <button @click="i += 1"> Add One </button>
  </fieldset>`
}

const App = {
  components: { Counter },
  mounted () {
    this.$watch(
        () => {
            return this.$refs.counter.i
        },
      (val) => {
        alert('App $watch $refs.counter.i: ' + val)
      }
    )
  },
  template: `<fieldset>
    <p>App</p>
    <counter ref="counter" />
  </fieldset>`
}

new Vue({
    el: '#app',
    render: h => h(App)
})

Watching $refs item for change in clientHeight - Get Help, Hi all, I'm trying to watch the height of a container that holds a textarea for change​, but none of what I've tried seems to be working. See the Pen  By adding a ref attribute to any element within the template, we can refer to these elements on our Vue instance. More specifically, we can access the DOM elements. So let’s try it out on the button that I have added in advance. The button already has a click event handler which doesn’t do anything yet. <button ref="myButton" @click

No, $refs are not reactive, watch won't work.

$refs should be reactive to be able to use them in computed , Now that refs are no longer reactive, we need to emit events and All data stuff I do with computed , data , methods and/or watch - and I never had a { $radio: this } // Be careful how you name this to not overlap with Vue.js!! # Template Refs. When using the Composition API, the concept of reactive refs and template refs are unified. In order to obtain a reference to an in-template element or component instance, we can declare a ref as usual and return it from setup():

In mounted use code below:

this.$watch(
        () => {
            return this.$refs.<name>.<data>
        },
      (val) => {
        alert('$watch $refs.<name>.<data>: ' + val)
      }
    )

Vue.js $watch $refs - JSFiddle, <div id="app"></div>. 2. ​. JavaScript + Vue 2.2.1 Tidy. 34. 1. const Counter = {. 2​. data: () => ({. 3. i: 0. 4. }),. 5. template: `<fieldset>. 6. <p>Counter</p>. 7. Vue does provide a more generic way to observe and react to data changes on a Vue instance: watch properties. When you have some data that needs to change based on some other data, it is tempting to overuse watch - especially if you are coming from an AngularJS background. However, it is often a better idea to use a computed property rather

Refs & Ref Attribute - Referencing in vuejs using ref, [DISCOUNTED] Master CSS Grid Course: https://bit.ly/2NONxxE Refs in vuejs - in this lecture Duration: 5:46 Posted: Mar 17, 2019 Vue.config is an object containing Vue’s global configurations. You can modify its properties listed below before bootstrapping your application: Suppress all Vue logs and warnings. Define custom merging strategies for options. The merge strategy receives the value of that option defined on the parent and child instances as the first and

How to use refs to access your application DOM in Vue.js , Learn how you can easily manipulate DOM elements in your Vue.js application by defining methods with ref attributes. Usage. This library exposes two different plugins: ReactiveRefs and DynamicReactiveRefs and you should only use one of them ReactiveRefs. Supports all browsers but requires you to manually declare refs in component options.

VueJS $watch $refs, VueJS $watch $refs. Возможно ли $watch Vue $refs ? Я хочу настроить логику против дочернего компонента, который вложен в мой текущий экземпляр  Vue does provide a more generic way to observe and react to data changes on a Vue instance: watch properties. When you have some data that needs to change based on some other data, it is tempting to overuse watch - especially if you are coming from an AngularJS background.

Comments
  • Is ; here deep: true; is by typo ?
  • Yes, that isn't in the actual code, thats just my bad port over to stackoverflow. Good spot, removed.
  • deep: true => Maximum call stack size exceeded
  • $refs.<name> may be undefined when mounted. you should this.$watch(() => this.$refs.comp.prop, (val) => {...}) when comp is created.
  • @aztack So do it in mounted hook
  • @KenBerkeley not necessarily, an element with a ref can be created at anytime. For example, an element representing an article can be created after an API call has return a response, on a button click.
  • Yup... ¯\_(ツ)_/¯