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| <!-- weightTrackerApp.vue -->
<template>
<div class="p-4 max-w-md mx-auto">
<h1 class="text-2xl font-bold mb-4">體重追蹤器</h1>
<!-- 輸入表單-->
<form @submit.prevent="addRecord" class="space-y-2 mb-4">
<div>
<label>日期：</label>
<input type="date" v-model="newRecord.date" />
</div>
<div>
<label>體重(kg):</label>
<input type="number" v-model.number="newRecord.weight" class="border px-2 py-1" required />
</div>
<button type="submit" class="bg-blue-500 text-white px-4 py-1 rounded">新增</button>
</form>
<!-- 清單-->
<ul class="space-y-2 mb-6">
<li v-for="(record, index) in sortedRecords" :key="record.id" class="flex justify-between items-center border p-2">
<span>{{ record.date }} - {{ record.weight }}kg</span>
<button @click="deleteRecord(record.id)" class="text-red-500">刪除</button>
</li>
</ul>
<!-- 圖表 -->
<canvas ref="chartCanvas" class="w-full h-64"></canvas>
</div>
</template>
<script setup>
import { ref, computed, onMounted, watch, nextTick } from 'vue'
const newRecord = ref({
date: '',
weight: null,
})
const records = ref([])
// 取得 chart DOM 元素
const chartCanvas = ref(null)
let weightChart = null
// 初始化資料
onMounted(() => {
const saved = localStorage.getItem('weight-records')
if (saved) {
records.value = JSON.parse(saved)
}
renderChart()
})
// 監看資料變化自動存入 localStorage 並更新圖表
watch(records, (newVal) => {
localStorage.setItem('weight-records', JSON.stringify(newVal))
nextTick(() => renderChart())
}, { deep: true })
const addRecord = () => {
if (!newRecord.value.date || !newRecord.value.weight) return
records.value.push({
id: Date.now(),
date: newRecord.value.date,
weight: newRecord.value.weight,
})
newRecord.value = { date: '', weight: null }
}
const deleteRecord = (id) => {
records.value = records.value.filter(r => r.id !== id)
}
const sortedRecords = computed(() => {
return [...records.value].sort((a, b) => new Date(a.date) - new Date(b.date))
})
const renderChart = () => {
if (!chartCanvas.value) return
// 銷毀舊圖表
if (weightChart) {
weightChart.destroy()
}
const data = sortedRecords.value
weightChart = new Chart(chartCanvas.value, {
type: 'line',
data: {
labels: data.map(r => r.date),
datasets: [{
label: '體重 (kg)',
data: data.map(r => r.weight),
borderColor: 'rgba(59,130,246,1)',
backgroundColor: 'rgba(59,130,246,0.2)',
fill: true,
tension: 0.2
}]
},
options: {
responsive: true,
plugins: {
title: {
display: true,
text: '體重變化圖'
}
},
scales: {
y: {
beginAtZero: false
}
}
}
})
}
</script>
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