Issue with VueJS where changes made to properties in the mounted hook do not properly trigger the

I'm working on a VueJS component that features a button with computed properties for its class and text. These properties change every time the button is clicked, updating smoothly with each interaction. However, I've encountered an issue when attempting to persist this state in localStorage. Although the value of 'ordered' is being updated correctly, the button's text and class are not reflecting the changes in the UI after a page reload. Can anyone offer suggestions on what might be causing this discrepancy? Below is the relevant source code:

<template>
  <div class="main-view">
    <button type="button" :class="order_button_style" @click="on_order_button_click()">
      {{ order_button_text }}
    </button>
  </div>
</template>

<script>
export default {
  name: "FoodComponent",
  props: {
    item: Object
  },
  methods: {
    on_order_button_click() {
      this.item.ordered = !this.item.ordered;
      localStorage.setItem(this.item.id, this.item.ordered);
    }
  },
  mounted() {
    var storedState = localStorage.getItem(this.item.id);
    if (storedState) {
      this.item.ordered = storedState;
    }
  },
  computed: {
    order_button_text() {
      return this.item.ordered === true ? "Ordered" : "Order";
    },
    order_button_style() {
      return this.item.ordered === true
        ? "button ordered-button"
        : "button unordered-button";
    }
  }
};
</script>

Answer №1

When retrieving data from local storage, it is important to note that you will receive a string value. In the mounted lifecycle hook, the ordered property might be stored as a string instead of a boolean, causing the condition for the order_button_text computed property to never evaluate to true. To resolve this issue, you can simply convert the storedState property to a boolean:

 mounted() {
    const storedState = localStorage.getItem(this.item.id) === 'true';
    if (storedState) {
      this.item.ordered = storedState;
    }
  },

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