Retrieve information about a parent's data related to child events in Vue.js

Question

Retrieve information about a parent's data related to child events in Vue.js

I'm working with two components nested inside each other. The parent component has a click event that needs to modify the data value of the child component.

<template>
   <div>
      .....
      .....
      <my-component
           :options="options">
      </my-component>
   </div>
.....
.....
</template>

<script>
...
...
data(){
}
methods:{
   clickEvent(array_from_child){
      this.array = array_from_child; //array is in my-component
   }
}
components:{
    ....
}
</script>

I am looking for a way to trigger the clickEvent method when there is a change in the child element's data. How can I achieve this?

javascript vue.js vuejs2 vue-component

Answer 1

Answer №1

It appears as though you have raised two distinct inquiries.

Initially, retrieving a child's data from its parent:

If feasible, it is advisable to pass the array to the child component through the child's props. Subsequently, any modifications made to the array in the parent will automatically be reflected in the child. Alternatively, if the array must reside within the child component, you can define a method to access it.

<template>
    <child-component ref="child">
    </child-component>
</template>

methods: {
    onClick() {
        const myArray = this.$refs.child.getMyArray();
    }
}

In the child component:

methods: {
    getMyArray() {
        return this.myArray;
    }
}

Secondly, triggering a change in the parent from the child:

In such scenarios, following Flame's suggestion would be most appropriate. Emit a custom event from the child and subsequently listen for that event in the parent component.

Answer 2

It appears as though you have raised two distinct inquiries.

Initially, retrieving a child's data from its parent:

If feasible, it is advisable to pass the array to the child component through the child's props. Subsequently, any modifications made to the array in the parent will automatically be reflected in the child. Alternatively, if the array must reside within the child component, you can define a method to access it.

<template>
    <child-component ref="child">
    </child-component>
</template>

methods: {
    onClick() {
        const myArray = this.$refs.child.getMyArray();
    }
}

In the child component:

methods: {
    getMyArray() {
        return this.myArray;
    }
}

Secondly, triggering a change in the parent from the child:

In such scenarios, following Flame's suggestion would be most appropriate. Emit a custom event from the child and subsequently listen for that event in the parent component.

Answer 3

Answer №2

When transitioning from being a child to becoming a parent, it is recommended to utilize events:

{
   methods: {
        clickEvent()
        {
            this.$emit('click', mydata);
        }
}

To handle this in the parent element, you can simply attach your custom callback function to the emitted event like this:

<template>
    <my-child-component @click="theParentMethod" />
</template>

Alternatively, you can incorporate reactivity by passing an object reference from the parent to the child. This way, any changes made to the object within the child component can be detected by the parent. However, it's important to be cautious of potential reactivity pitfalls, which are outlined in more detail at https://v2.vuejs.org/v2/guide/reactivity.html.

Answer 4

When transitioning from being a child to becoming a parent, it is recommended to utilize events:

{
   methods: {
        clickEvent()
        {
            this.$emit('click', mydata);
        }
}

To handle this in the parent element, you can simply attach your custom callback function to the emitted event like this:

<template>
    <my-child-component @click="theParentMethod" />
</template>

Alternatively, you can incorporate reactivity by passing an object reference from the parent to the child. This way, any changes made to the object within the child component can be detected by the parent. However, it's important to be cautious of potential reactivity pitfalls, which are outlined in more detail at https://v2.vuejs.org/v2/guide/reactivity.html.

Retrieve information about a parent's data related to child events in Vue.js

Answer №1

Answer №2

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