Exploring Vue's feature of passing props and emitting events within nested components

Within my coding project, I am facing the challenge of properly implementing a parent component containing a form that includes a birthday component. This birthday component consists of two separate components within it. My task is to effectively pass props and emit changes between these main components, but I am unsure about what specific props should be passed.

My query revolves around determining the appropriate props to pass and emit. It appears that each nested child component has its own set of defined props, the parent component also has defined props, and the birthday component acts as a mediator between the two. How can I decipher which props to use?

To provide a clearer picture of the structure:

Parent Form Component

    ^ data v

Birthday Component

    ^ data v

Select Options && Text Input Components

The props for each component are outlined as follows:

// Parent Form Component

  props: {
    currentSlide: {
      type: String,
      required: true
    },
    totalSlides: {
      type: String,
      required: true
    },
    nextRoute: {
      type: Object,
      required: true
    }
  }

Here's the code snippet showing the birthday component within the Parent Form Component:

<Birthday
  :value="$v.form.dob.model" // was informed this was passing a prop from a peer
  :show-errors="fieldErrors"
  describedBy="edit-dob-error"
  @input="v => setAge(v)"
  ref="dobInput"
/>

Props definition for the Select Options Component:

  props: {
    options: {
      type: Array,
      require: true
    },
    header: {
      type: String,
      required: false
    },
    value: {
      type: String,
      required: false
    },
    dateSelected: {
      type: Boolean,
      required: false
    },
    narrow: {
      type: Boolean,
      required: false
    },
    textInput: {
      type: Boolean,
      required: false
    },
    year: {
      type: [String, Number],
      required: false
    }
  }

In essence, my goal is to return (or $emit) a string 'yyyy-mm-dd' to the Parent Form Component in order to utilize existing validation methods. However, I am struggling to understand how to successfully achieve this desired outcome.

Answer №1

To access the parent variable in your component, you can chain the $parent like this:

this.$parent.$parent ...

By doing this, you are able to execute methods from the parent component.

Another approach is to emit an event to the parent, catch it, and then emit it again to the parent component. However, passing a variable that has been modified by the child as a prop will result in an error thrown by Vue.

In reality, your select component should emit the @change event to the parent so that you don't have to worry about its inner workings (if the component is obtained from an external source, it should already be emitting).

If you absolutely need to send a value as a prop and make changes to it, you should utilize the sync modifier.

I came across an article discussing this topic here, which you may find helpful.

Alternatively, you can create a copy of the prop within your select component, make changes to it, and then emit it back to the parent. In your template, you can work with the local variable instead.

Answer №2

To display the final string result, you can follow this method:

display final text
</text-form @changedText=UpdatedText>
function: UpdatedText(text){
console.log(text)
}

// receiving text through emit prop
</text-component @changedText=UpdatedText>
function: UpdatedText(text){
this.$emit(changedText,text);
}

// updating state and passing new text as emit prop
</update-text-component>
this.$emit(changedText,newText);

This technique may prove useful. Alternatively, consider utilizing a store to update the state from any component.

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