Steer clear of directly modifying a prop in Vue.js to prevent errors

I have developed a custom DateField component. It is functioning properly but I am encountering an error message stating Avoid mutating the prop 'value'. This error occurs when I close the menu by clicking the Cancel button or by clicking outside the menu.

Below is the code snippet -

<template>
  <v-menu
    :close-on-content-click="false"
    :return-value.sync="value"
    max-width="290px"
    min-width="290px"
    offset-y
    ref="menu"
    transition="scale-transition"
    v-model="menu"
  >
    <template v-slot:activator="{ on }">
      <v-text-field
        :label="label"
        :placeholder="placeholder"
        :value="value"
        @input="$emit('input', $event)"
        v-on="on"
        :hint="hint"
      />
    </template>
    <v-date-picker
      :value="dateValue"
      @change="$emit('input', $event)"
      no-title
      scrollable
      :type="type"
    >
      <v-spacer/>
      <v-btn @click="menu = false" color="primary" text>Cancel</v-btn>
      <v-btn @click="$refs.menu.save(value)" color="primary" text>OK</v-btn>
    </v-date-picker>
  </v-menu>
</template>

Answer №1

Since the script part was not provided, I will make some assumptions..

One way to handle this is by using the $emit method to send a signal to the parent component (the component that passed the menu prop) and then receive and process that signal in the parent component by using @emitName.

For example:

<v-btn @click="$emit('cancel')" color="primary" text>Cancel</v-btn>

In the parent component:

<SonComponent :menu="menuData" @cancel="menu=false" />

You can find more information on custom events here

I hope this explanation is helpful.

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