I am trying to get data from an API and edit the endpoint based on the selected value from a dropdown and show the respective chart for it, can I integrate js, jQuery and charts all together? Below is my code where I tried this:
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>
However it does not display any values on the chart when the dropdowns are changed, how do I correct this?
CodePudding user response：
You should assign the chart to a global variable and update its data each time a different state is selected from the drop-down. After that, you need to invoke chart.update().
For further information, please consult Updating Charts from the Chart.js documentation.
Please take a look at your amended code and see how it works.
$(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 >
<div >
<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>
</html>