我正在嘗試從 API 獲取資料并根據從下拉串列中選擇的值編輯端點并為其顯示相應的圖表，我可以將 js、jQuery 和圖表集成在一起嗎？下面是我嘗試過的代碼：
async function bruh(){
$( document ).ready(function() {
$('select').on('change', async function() {
this.value = this.value.toLowerCase();
const apiUrl = 'https://api.covidtracking.com/v1/states/' this.value '/daily.json';
const response = await fetch(apiUrl)
const barChatData = await response.json()
console.log(barChatData)
const positive = barChatData.map((x) => x.positive)
const date = barChatData.map((x) => x.date)
positives = positive
dates = date
});
})
}
async function dummyChartbruh() {
await bruh()
const ctx = document.getElementById('yourChart').getContext('2d');
const chart = new Chart(ctx, {
type: 'line',
data: {
labels: dates,
datasets: [{
label: 'Positive',
backgroundColor: 'blue',
borderColor: 'rgb(255, 99, 132)',
data: positives,
fill: false
}
]
},
options: {
tooltips: {
mode: 'index'
}
}
})
document.getElementById("yourChart").removeAttribute("hidden");
$('#yourChart').show()
}
dummyChartbruh()
HTML：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BmbxuPwQa2lc/FVzBcNJ7UAyJxM6wuqIj61tLrc4wSX0szH/Ev nYRRuWlolflfl" crossorigin="anonymous">
<link rel="stylesheet" href="/styles.css" />
<title>Covid Data</title>
</head>
<body>
<div >
<div >
<h2>Covid Data</h2>
<select>
<option value="AL">Alabama</option>
<option value="AK">Alaska</option>
<option value="AZ">Arizona</option>
<option value="AR">Arkansas</option>
<option value="CA">California</option>
<option value="CO">Colorado</option>
<option value="CT">Connecticut</option>
<option value="DE">Delaware</option>
<option value="DC">District Of Columbia</option>
<option value="FL">Florida</option>
<option value="GA">Georgia</option>
<option value="HI">Hawaii</option>
<option value="ID">Idaho</option>
<option value="IL">Illinois</option>
<option value="IN">Indiana</option>
<option value="IA">Iowa</option>
<option value="KS">Kansas</option>
<option value="KY">Kentucky</option>
<option value="LA">Louisiana</option>
<option value="ME">Maine</option>
<option value="MD">Maryland</option>
<option value="MA">Massachusetts</option>
<option value="MI">Michigan</option>
<option value="MN">Minnesota</option>
<option value="MS">Mississippi</option>
<option value="MO">Missouri</option>
<option value="MT">Montana</option>
<option value="NE">Nebraska</option>
<option value="NV">Nevada</option>
<option value="NH">New Hampshire</option>
<option value="NJ">New Jersey</option>
<option value="NM">New Mexico</option>
<option value="NY">New York</option>
<option value="NC">North Carolina</option>
<option value="ND">North Dakota</option>
<option value="OH">Ohio</option>
<option value="OK">Oklahoma</option>
<option value="OR">Oregon</option>
<option value="PA">Pennsylvania</option>
<option value="RI">Rhode Island</option>
<option value="SC">South Carolina</option>
<option value="SD">South Dakota</option>
<option value="TN">Tennessee</option>
<option value="TX">Texas</option>
<option value="UT">Utah</option>
<option value="VT">Vermont</option>
<option value="VA">Virginia</option>
<option value="WA">Washington</option>
<option value="WV">West Virginia</option>
<option value="WI">Wisconsin</option>
<option value="WY">Wyoming</option>
</select>
</div>
<canvas id="myChart" ></canvas>
<canvas id="yourChart" hidden></canvas>
</div>
<script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
<script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj 3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
<script src="app.js"></script>
</body>
</html>
但是，當下拉串列更改時，它不會在圖表上顯示任何值，我該如何更正？
uj5u.com熱心網友回復：
您應該將圖表分配給一個全域變數，并在每次從下拉串列中選擇不同的狀態時更新其資料。之后，您需要呼叫chart.update().
有關更多資訊，請參閱Chart.js 檔案中的更新圖表。
請查看您修改后的代碼，看看它是如何作業的。
$(document).ready(function() {
$('select').on('change', function() {
const state = this.value.toLowerCase();
fetch('https://api.covidtracking.com/v1/states/' state '/daily.json')
.then(response => response.json())
.then(json => {
myChart.data.labels = json.map((x) => x.date);
myChart.data.datasets[0].data = json.map((x) => x.positive);
myChart.update();
});
});
});
const myChart = new Chart('myChart', {
type: 'line',
data: {
labels: [],
datasets: [{
label: 'Positive',
backgroundColor: 'blue',
borderColor: 'rgb(255, 99, 132)',
data: [],
fill: false
}]
},
options: {
tooltips: {
mode: 'index'
}
}
});<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BmbxuPwQa2lc/FVzBcNJ7UAyJxM6wuqIj61tLrc4wSX0szH/Ev nYRRuWlolflfl" crossorigin="anonymous">
<link rel="stylesheet" href="/styles.css" />
<title>Covid Data</title>
</head>
<body>
<div class="card text-center m-5">
<div class="card-header">
<h2>Covid Data</h2>
<select>
<option>Select State...</option>
<option value="AL">Alabama</option>
<option value="AK">Alaska</option>
<option value="AZ">Arizona</option>
<option value="AR">Arkansas</option>
<option value="CA">California</option>
<option value="CO">Colorado</option>
<option value="CT">Connecticut</option>
<option value="DE">Delaware</option>
<option value="DC">District Of Columbia</option>
<option value="FL">Florida</option>
<option value="GA">Georgia</option>
<option value="HI">Hawaii</option>
<option value="ID">Idaho</option>
<option value="IL">Illinois</option>
<option value="IN">Indiana</option>
<option value="IA">Iowa</option>
<option value="KS">Kansas</option>
<option value="KY">Kentucky</option>
<option value="LA">Louisiana</option>
<option value="ME">Maine</option>
<option value="MD">Maryland</option>
<option value="MA">Massachusetts</option>
<option value="MI">Michigan</option>
<option value="MN">Minnesota</option>
<option value="MS">Mississippi</option>
<option value="MO">Missouri</option>
<option value="MT">Montana</option>
<option value="NE">Nebraska</option>
<option value="NV">Nevada</option>
<option value="NH">New Hampshire</option>
<option value="NJ">New Jersey</option>
<option value="NM">New Mexico</option>
<option value="NY">New York</option>
<option value="NC">North Carolina</option>
<option value="ND">North Dakota</option>
<option value="OH">Ohio</option>
<option value="OK">Oklahoma</option>
<option value="OR">Oregon</option>
<option value="PA">Pennsylvania</option>
<option value="RI">Rhode Island</option>
<option value="SC">South Carolina</option>
<option value="SD">South Dakota</option>
<option value="TN">Tennessee</option>
<option value="TX">Texas</option>
<option value="UT">Utah</option>
<option value="VT">Vermont</option>
<option value="VA">Virginia</option>
<option value="WA">Washington</option>
<option value="WV">West Virginia</option>
<option value="WI">Wisconsin</option>
<option value="WY">Wyoming</option>
</select>
</div>
<canvas id="myChart"></canvas>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.6.2/chart.min.js"></script>
<script src="https://code.jquery.com/jquery-3.6.0.min.js" integrity="sha256-/xUj 3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4=" crossorigin="anonymous"></script>
<script src="app.js"></script>
</body>
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標籤：javascript 查询 图表.js
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