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| <template>
<div class="p-4 max-w-6xl mx-auto">
<h1 class="text-2xl font-bold mb-6 text-center">體重追蹤器</h1>
<!-- 雙欄式佈局：左 1/4，右 3/4 -->
<div class="flex flex-col md:flex-row gap-6">
<!-- 左邊：輸入與清單，佔 1/4 -->
<div class="md:w-1/4 space-y-4">
<!-- 表單 -->
<form @submit.prevent="addRecord" class="space-y-2">
<div>
<label class="block mb-1">日期：</label>
<input type="date" v-model="newRecord.date" class="w-full border px-2 py-1 rounded" />
</div>
<div>
<label class="block mb-1">體重(kg)：</label>
<input type="number" v-model.number="newRecord.weight" class="w-full border px-2 py-1 rounded" required />
</div>
<button type="submit" class="bg-blue-500 text-white px-4 py-1 rounded w-full">新增</button>
</form>
<!-- 清單 -->
<ul class="space-y-2">
<li v-for="(record, index) in sortedRecords" :key="record.id"
class="flex justify-between items-center border p-2 rounded text-sm">
<span>{{ record.date }} - {{ record.weight }}kg</span>
<button @click="deleteRecord(record.id)" class="text-red-500">刪除</button>
</li>
</ul>
</div>
<!-- 右邊：圖表，佔 3/4 -->
<div class="md:w-3/4">
<canvas ref="chartCanvas" class="w-full h-96"></canvas>
</div>
</div>
</div>
</template>
<script setup>
import { ref, computed, onMounted, watch, nextTick } from 'vue'
const newRecord = ref({
date: '',
weight: null,
})
const records = ref([])
const chartCanvas = ref(null)
let weightChart = null
onMounted(() => {
const saved = localStorage.getItem('weight-records')
if (saved) {
records.value = JSON.parse(saved)
}
renderChart()
})
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
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>
|