Vue Js Emit Event

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Modified5 months ago. I'm pretty new to Vue.js, and I use ES6 syntax with vue-class-component.

I'm having a problem while trying to emit an event from a child to its parent. I followed the logic of the default Vue.js syntax but can't seem to have my parent catch an event emitted by the the child.

Child Component. I attached a click event listener on every

  • , which calls a function that emits an event.

    The event listener is defined on the parent.

    Parent Component. Following the vue.js syntax, I should be able to listen to the child's event from the parent, by emitting the event from the element, but the parent doesn't seem to catch the event.

    Where am I going wrong? 2222 bronze badges.

    You need to $emit on the view model you want to receive your $emit, use a bus or use https://vuex.vuejs.org/.

    The easiest way, is to simply $emit from the child directly to the parent component:. This is OK, but if you have a long chain of components you need to $emit to each $parent in the chain.

    You can use Vue to create a global event bus very simply.

    You create an instance of Vue in your main component, then all other components in your application can emit events to it, and use on to react to those events.

  • It is also possible to emit to $root but this isn't recommended.
    euvleuvl
    4,358

    This would also be similar is you were using the bus, but you would just reference the bus instead:.

    And you may also use it directly in your html using v-on:.

    55 gold badges5858 silver badges6767 bronze badges.

    6767 bronze badges. In Vue, you can communicate from children up to parent components by emitting events.

    The child compoment"emits" an event with $emit & the parent component"listens" for it like so:. Child Component:. Parent Component:. You can find a working sample code implementationhere & use it in your own context. 33 gold badges2929 silver badges4848 bronze badges.

    4848 bronze badges. Unless I'm missing something (very likely), in a simple example like this, you just need to listen for the emitted event in your component.

    For example, in your parent element, you would have:.

    Then in your child (HorizontalNavigation) component, you would emit the 'ChangeView' event:.

    euvleuvl
    4,3586

    11 gold badge1111 silver badges2222 bronze badges. 2222 bronze badges. If you end up here looking for Vue 3 script setup.

    It's good practice for readibility to declare emits with defineEmits and then use the returned function for emitting.

    Child component :. Parent component :. Here is the working implementation. Vue $emit lets us emit, or send, custom events from a child component to its parent. In a standard Vue flow, this is the best way to trigger certain events (like closing a popup, for example) or to send data from a child component (like making a custom input).

    This article focuses in detail on Vue $emit, click here for a broader guide on handling Vue events.

    Each Vue $emit call can pass two arguments:.

    The event name – this is the name that we can listen to in our parent component. A payload object – data that we want to pass with the event; this is optional.

    Here’s an example of a typical emit using both parameters $emit('event-name', data).

    There are a bunch of different ways to use Vue $emit in your code, the three that I’ll be covering in this article are….

    Inline using $emit. Options API – this.$emit. Composition API – context.emit. Each of them has its own pros/cons depending on your case, so let’s just check out an example in each and you can see which works for you. An example of where you might want to send data out of a component is when building your own custom form input – let’s imagine a custom text input.

    Flynn HouFlynn Hou
    429

    To achieve this, we need our custom text input to listen for the native input events, and then emit its own event.

    supersansupersan
    4,986

    Now, let’s move on to emitting events from our script section. Like almost everything in Vue 3, we have the choice of using the Options API or the Composition API to emit custom events from our component.

    In the Options API, the $emit method can be called using this.

    So in our same MyInput example, let’s say that instead of calling $emit in our template, we call a Vue method first instead.

    Then, inside our method, we can call this.$emit and same as last time, pass it our event.target.value.
    2

    In the Composition API, since setup runs before our component is created, we have no access to this. Instead, we can access our emit method by using the second argument of our setup function – context.

    HuskyHusky
    5,2052

    make setup take the whole context object OR. get only emit by destructuring context. We can just call emit the same exact as the Options API: create a method, call emit, and pass it our arguments!

    And there you have it!

    You now know THREE different ways to emit custom events in Vue.

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