Sharing functions as properties with child components

Question

Sharing functions as properties with child components

If I have a reusable component called Modal in my application and I want to dynamically bind functions to the Yes button, how can I pass a function to the @click event of the Yes button within the Modal as a prop? For example:

//data tags are used for fast markup here only
<template>
    <div>
        <div :id="`${id}`" data-modal>
           <div data-modal-title>
               {{title}}
           </div>
           <div data-modal-body>
               {{body}}
           </div>
           <div data-modal-footer>
               <button @click="//event to be passed//" data-modal-button-ok>Yes</button>
               <button data-modal-button-cancel>Yes</button>
           </div>
       </div>
   </div>
</template>

<script>
   export default {
       name: 'modal',
       props: [
          'id',
          'title',
          'body',
           // event?
       ]
   }
</script>

When using this modal, how should the event be passed?

<Modal id="x" title="y" body="z" //event="????"//></Modal>

javascript vue.js vuejs2 vue-component

Answer 1

Answer №1

To trigger an event (let's call it yes) in the modal, you can:

<button @click="$emit('yes')" data-modal-button-ok>Yes</button>

Alternatively, you can create a method:

<button @click="handleYesClick" data-modal-button-ok>Yes</button>

methods: {
  handleYesClick() {
    this.$emit('yes');
  }
}

In the parent component, listen for this event using:

<modal ... v-on:yes="someCodeToExecute"></modal>

or the shorthand version:

<modal ... @yes="someCodeToExecute"></modal>

Check out the demo below:

Vue.component('modal',  {
  template: "#modal",
  name: 'modal',
  props: ['id', 'title', 'body']
})
new Vue({
  el: '#app',
  data: {},
  methods: {
    methodAtParentYes() {
      alert('methodAtParentYes!');
    },
    methodAtParentCancel() {
      alert('methodAtParentCancel!');
    }
  }
})

<script src="https://unpkg.com/vue"></script>

<template id="modal">
    <div>
        <div :id="`${id}`" data-modal>
           <div data-modal-title>
               {{title}}
           </div>
           <div data-modal-body>
               {{body}}
           </div>
           <div data-modal-footer>
               <button @click="$emit('yes')" data-modal-button-ok>Yes</button>
               <button @click="$emit('cancel')" data-modal-button-cancel>Cancel</button>
           </div>
       </div>
   </div>
</template>

<div id="app">
  <modal id="1" title="My Title" body="Body" @yes="methodAtParentYes" @cancel="methodAtParentCancel"></modal>
</div>

Answer 2

To trigger an event (let's call it yes) in the modal, you can:

<button @click="$emit('yes')" data-modal-button-ok>Yes</button>

Alternatively, you can create a method:

<button @click="handleYesClick" data-modal-button-ok>Yes</button>

methods: {
  handleYesClick() {
    this.$emit('yes');
  }
}

In the parent component, listen for this event using:

<modal ... v-on:yes="someCodeToExecute"></modal>

or the shorthand version:

<modal ... @yes="someCodeToExecute"></modal>

Check out the demo below:

Vue.component('modal',  {
  template: "#modal",
  name: 'modal',
  props: ['id', 'title', 'body']
})
new Vue({
  el: '#app',
  data: {},
  methods: {
    methodAtParentYes() {
      alert('methodAtParentYes!');
    },
    methodAtParentCancel() {
      alert('methodAtParentCancel!');
    }
  }
})

<script src="https://unpkg.com/vue"></script>

<template id="modal">
    <div>
        <div :id="`${id}`" data-modal>
           <div data-modal-title>
               {{title}}
           </div>
           <div data-modal-body>
               {{body}}
           </div>
           <div data-modal-footer>
               <button @click="$emit('yes')" data-modal-button-ok>Yes</button>
               <button @click="$emit('cancel')" data-modal-button-cancel>Cancel</button>
           </div>
       </div>
   </div>
</template>

<div id="app">
  <modal id="1" title="My Title" body="Body" @yes="methodAtParentYes" @cancel="methodAtParentCancel"></modal>
</div>

Answer 3

Answer №2

There are a couple of ways to achieve this functionality.

The first approach is to pass the method down as a prop in the Parent component and then call that prop directly in the click handler within the Modal component.

Parent.vue

<template>
   <Modal id="x" title="y" body="x" :handleYes="handleYes"></Modal>
</template>
<script>
  methods: {
    handleYes () {
      // perform desired action
    }
  }
</script>

Modal.vue

<button @click="handleYes()">Yes</button>

Another way is to utilize $emit. In the Modal.vue component, you can define a method to emit an event which can then be listened for in the Parent component where the method will be called.

Modal.vue

<template>
  <button @click="emitEvent">Yes</button> 
</template>
<script>
  methods: {
    emitEvent () {
      this.$emit('userClickedYes')
    }
  }
</script>

Parent.vue

<template>
   <Modal id="x" title="y" body="x" @userClickedYes="handleYes"></Modal>
</template>
<script>
  methods: {
    handleYes () {
      // perform desired action
    }
  }
</script>

Answer 4

There are a couple of ways to achieve this functionality.

The first approach is to pass the method down as a prop in the Parent component and then call that prop directly in the click handler within the Modal component.

Parent.vue

<template>
   <Modal id="x" title="y" body="x" :handleYes="handleYes"></Modal>
</template>
<script>
  methods: {
    handleYes () {
      // perform desired action
    }
  }
</script>

Modal.vue

<button @click="handleYes()">Yes</button>

Another way is to utilize $emit. In the Modal.vue component, you can define a method to emit an event which can then be listened for in the Parent component where the method will be called.

Modal.vue

<template>
  <button @click="emitEvent">Yes</button> 
</template>
<script>
  methods: {
    emitEvent () {
      this.$emit('userClickedYes')
    }
  }
</script>

Parent.vue

<template>
   <Modal id="x" title="y" body="x" @userClickedYes="handleYes"></Modal>
</template>
<script>
  methods: {
    handleYes () {
      // perform desired action
    }
  }
</script>

Sharing functions as properties with child components

Answer №1

Answer №2

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