The product component displayed below allows users to view the macro nutrient information of a product and also modify the serving size, which automatically updates the macro nutrient amounts.
However, I am encountering an issue where the values are not being updated correctly, even when using "vue set".
I have implemented a watcher to trigger the calcNewNutriValues function.
<template>
<div class="product">
<div class="topbar">
<div class="left">
<p class="left__name">{{ product.name }}</p>
<p class="left__energy">{{ product.energy }}</p>
</div>
<div class="right">
<button class="cancel" @click="removeItem">
<inline-svg
:src="require('../assets/svg/addition-icon.svg')"
></inline-svg>
</button>
</div>
</div>
<div class="details">
<div class="macros">
<p class="details__heading">Macros</p>
<div class="macros__container container">
<div class="wrapper" v-for="(macro, name, index) in product.macros" :key="index">
<p>{{ name }}</p>
<p>{{ product.macros[name] }}</p>
</div>
</div>
</div>
<div class="serving">
<p class="details__heading">Serving Size (g)</p>
<input type="number" placeholder="40" v-model.number="productServSize">
</div>
</div>
</div>
</template>
export default {
data () {
return {
productServSize: 0,
ogServSize: 0,
macros: {
protein: '',
carbs: '',
fats: '',
fibre: ''
},
micros: {},
energy: ''
}
},
props: [
'product',
],
methods: {
serving () {
const num = this.product.servingSize.split(' ')[0]
this.productServSize = parseFloat(num)
this.ogServSize = parseFloat(num)
},
removeItem () {
this.$emit('removeProduct', this.product)
},
calcNewNutriValues () {
Object.keys(this.product.macros).forEach(key => {
let num = parseFloat(this.product.macros[key].split(' ')[0])
let perGram = parseFloat(num / this.ogServSize)
let newTotal = `${(perGram * this.productServSize).toFixed(1)} g`
this.$set(this.macros, key, newTotal)
})
}
},
mounted () {
this.serving()
Object.assign(this.macros, this.product.macros)
this.energy = this.product.energy
},
watch: {
productServSize: {
handler () {
this.calcNewNutriValues()
this.$emit('updatedNutriValues', this.product)
}
}
}
}