javascript - 如何从选择器到 json 文档进行选择？

标签 javascript html css json drop-down-menu

如何才能在下拉菜单中选择一个国家/地区并获取该国家/地区的数据？ 国家/地区代码:

Netherlands 169

Germany 120

France 116

Spain 225

Italy 137

Russia 187

South-Korea 143

USA 201

(在获取函数中，荷兰的国家代码为 169，德国等国家代码应为 120)

window.onload = function() {
	getCovidStats();
}

function getCovidStats() {
	fetch('https://coronavirus-tracker-api.herokuapp.com/v2/locations/169')
	.then(function(resp) { return resp.json() })
	.then(function(data) {
		let population = data.location.country_population;
		let update = data.location.last_updated;
		let confirmedCases = data.location.latest.confirmed;
		let deaths = data.location.latest.deaths;

		document.getElementById('population').innerHTML = population.toLocaleString('en');
		document.getElementById('update').innerHTML = update.substr(0, 10);
		document.getElementById('cases').innerHTML = confirmedCases.toLocaleString('en');
		document.getElementById('deaths').innerHTML = deaths.toLocaleString('en');
		document.getElementById('percent').innerHTML = ((Number(deaths)/Number(confirmedCases))*100).toLocaleString("en", {minimumFractionDigits: 2, maximumFractionDigits: 2}) + "%";




	})
	.catch(function() {
		console.log("error");
	})
	setTimeout(getCovidStats, 43200000) // update every 12 hours
}
* {
	margin: 0;
	padding: 0;
}

html {
	height: 100%;
	width: 100%;
}
h1, h2 {
	font-family: 'Roboto', sans-serif;
	font-weight: 300;
	text-align: center;
	padding-bottom: 20px;
	font-size: 250%;
}

.title {
	background: linear-gradient(to right, #feb47b, #ff7e5f);
	padding: 20px;
}

.subtitle {
	padding: 20px;
	font-size: 150%;
}

div {
	padding: 20px;
}

.stats-container {
	text-align: center;
	float: right;
	display: inline-block;
}
.location-container {
	display: inline-block;
}
.data-container {
	border: 2px solid #feb47b;
	margin-right: 30%;
	margin-left: 30%;

}
h4 {
	font-size: 85%;
 	color: gray;
 	font-family: 'Roboto', sans-serif;
 	font-weight: 300;
 	text-align: center;
 	padding-top: 20px;
 	padding-left: 20px;
 	padding-right: 20px;
 	padding-bottom: 5px;
}
.footer {
	font-family: 'Roboto', sans-serif;
	bottom: 0;
	font-size: 75%;
	padding: 5px;
}
<!DOCTYPE html>
<html>
<head>
	<title>Name</title>

	<link rel="shortcut icon" href="masker-emoji.png">
	<link href="https://fonts.googleapis.com/css?family=Roboto:100,300,400&display=swap" rel="stylesheet">
	<link rel="stylesheet" type="text/css" href="styles.css">
	<script type="text/javascript" src="app.js"></script>

</head>
<body>
	<h1 class="title">Coronavirus Stats.</h1>
	<h2 class="subtitle">Subtitle</h2>
	<div class="data-container">
		<div class="stats-container">
			<h4>Tested positive</h4>
			<h1 id="cases"></h1>
			<h4>Deaths</h4>
			<h1 id="deaths"></h1>
			<h4>Death percentage</h4>
			<h1 id="percent"></h1>
		</div>
		<div class="location-container">
			<h4>Land</h4>
			<h1 id="country"><label for="Country">Country:</label>
				<select id="cars">
				  <option value="Netherlands">Netherlands</option>
				  <option value="Germany">Germany</option>
				  <option value="France">France</option>
				  <option value="Spain">Spain</option>
				  <option value="Italy">Italy</option>
				  <option value="Russia">Russia</option>
				  <option value="South-Korea">South-Korea</option>
				  <option value="USA">USA</option>
				</select></h1>
			<h4>Population</h4>
			<h1 id="population"></h1>
			<h4>Last update on</h4>
			<h1 id="update"></h1>
		</div>
	</div>
	<h1 class="footer">Footer</h1>
</body>
</html>

最佳答案

像这样

在选择时使用 addEventListener 并将值更改为数字。

我添加了“请选择”

并将 ID 从 cars 更改为 <select id="countrySel"> 

window.addEventListener("load",function() {
  document.getElementById("countrySel").addEventListener("change",getCovidStats);
  document.getElementById("countrySel").value="169";
  getCovidStats()
})

function getCovidStats() {
  const cc = document.getElementById("countrySel").value;
  if (cc==="") return;
  
  fetch('https://coronavirus-tracker-api.herokuapp.com/v2/locations/'+cc)
    .then(function(resp) {
      return resp.json()
    })
    .then(function(data) {
      let population = data.location.country_population;
      let update = data.location.last_updated;
      let confirmedCases = data.location.latest.confirmed;
      let deaths = data.location.latest.deaths;

      document.getElementById('population').innerHTML = population.toLocaleString('en');
      document.getElementById('update').innerHTML = update.substr(0, 10);
      document.getElementById('cases').innerHTML = confirmedCases.toLocaleString('en');
      document.getElementById('deaths').innerHTML = deaths.toLocaleString('en');
      document.getElementById('percent').innerHTML = ((Number(deaths) / Number(confirmedCases)) * 100).toLocaleString("en", {
        minimumFractionDigits: 2,
        maximumFractionDigits: 2
      }) + "%";
    })
    .catch(function() {
      console.log("error");
    })
    setInterval(getCovidStats, 43200000) // update every 12 hours
}
* {
  margin: 0;
  padding: 0;
}

html {
  height: 100%;
  width: 100%;
}

h1,
h2 {
  font-family: 'Roboto', sans-serif;
  font-weight: 300;
  text-align: center;
  padding-bottom: 20px;
  font-size: 250%;
}

.title {
  background: linear-gradient(to right, #feb47b, #ff7e5f);
  padding: 20px;
}

.subtitle {
  padding: 20px;
  font-size: 150%;
}

div {
  padding: 20px;
}

.stats-container {
  text-align: center;
  float: right;
  display: inline-block;
}

.location-container {
  display: inline-block;
}

.data-container {
  border: 2px solid #feb47b;
  margin-right: 30%;
  margin-left: 30%;
}

h4 {
  font-size: 85%;
  color: gray;
  font-family: 'Roboto', sans-serif;
  font-weight: 300;
  text-align: center;
  padding-top: 20px;
  padding-left: 20px;
  padding-right: 20px;
  padding-bottom: 5px;
}

.footer {
  font-family: 'Roboto', sans-serif;
  bottom: 0;
  font-size: 75%;
  padding: 5px;
}
<!DOCTYPE html>
<html>

<head>
  <title>Name</title>

  <link rel="shortcut icon" href="masker-emoji.png">
  <link href="https://fonts.googleapis.com/css?family=Roboto:100,300,400&display=swap" rel="stylesheet">
  <link rel="stylesheet" type="text/css" href="styles.css">
  <script type="text/javascript" src="app.js"></script>

</head>

<body>
  <h1 class="title">Coronavirus Stats.</h1>
  <h2 class="subtitle">Subtitle</h2>
  <div class="data-container">
    <div class="stats-container">
      <h4>Tested positive</h4>
      <h1 id="cases"></h1>
      <h4>Deaths</h4>
      <h1 id="deaths"></h1>
      <h4>Death percentage</h4>
      <h1 id="percent"></h1>
    </div>
    <div class="location-container">
      <h4>Country</h4>
      <h1 id="country"><label for="countrySel">Country:</label>
        <select id="countrySel">
          <option value="">Please select</option>
          <option value="169">Netherlands</option>
          <option value="120">Germany</option>
          <option value="116">France</option>
          <option value="225">Spain</option>
          <option value="137">Italy</option>
          <option value="187">Russia</option>
          <option value="143">South-Korea</option>
          <option value="201">USA</option>
        </select>
      </h1>
      <h4>Population</h4>
      <h1 id="population"></h1>
      <h4>Last update on</h4>
      <h1 id="update"></h1>
    </div>
  </div>
  <h1 class="footer">Footer</h1>
</body>

</html>

关于javascript - 如何从选择器到 json 文档进行选择？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/61058618/

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