我希望将setTimeout
添加到JS函数中,但在此函数中我还有另一个函数,我知道我可以使用onclick=setTimeout"(fooBar(), 2500);"
但是在那里' sa在我的函数内部加载,为了清楚起见,我想在单击按钮时立即执行该功能(show loader div),但在运行setTimout
之前$.getJSON
到2500毫秒。让我们说我想在api请求中添加一个假的timeOut,因为那些东西非常快。
另外,如果我的JS加载动画方法没问题,请告诉我,实际上我认为显示/隐藏div的代码行太多了。我确定有更好的方法来处理这样的事情。感谢。
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>JS Loader</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
</head>
<body>
<style type="text/css" id="style">
#myloader {
position: relative;
left: 50%;
top: 50%;
z-index: 1;
width: 150px;
height: 150px;
margin: 25% -50;
border: 16px solid #000;
border-radius: 50%;
border-top: 16px solid #3498db;
width: 120px;
height: 120px;
-webkit-animation: spin 2s linear infinite;
animation: spin 2s linear infinite;
}
@-webkit-keyframes spin {
0% { -webkit-transform: rotate(0deg); }
100% { -webkit-transform: rotate(360deg); }
}
@keyframes spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}
/* Add animation to "page content" */
.animate-bottom {
position: relative;
-webkit-animation-name: animatebottom;
-webkit-animation-duration: 1s;
animation-name: animatebottom;
animation-duration: 1s
}
@-webkit-keyframes animatebottom {
from { bottom:-100px; opacity:0 }
to { bottom:0px; opacity:1 }
}
@keyframes animatebottom {
from{ bottom:-100px; opacity:0 }
to{ bottom:0; opacity:1 }
}
#myDiv {
display: none;
text-align: center;
}
</style>
<div class="container container-table">
<div class="row vertical-center-row">
<div class="col-md-4 col-md-offset-4">
<h1 id="name" >Real-time Bitcoin Price</h1>
<div id="myloader"style="display: none;"></div>
<p id="cointime"></p>
<div id="dollar"></div>
<div id="gbp"></div>
<div id="euro"></div><br>
<button id="refreshBtn" class="btn btn-primary">Load Data</button>
</div>
</div>
</div>
<script type="text/javascript">
document.getElementById("refreshBtn").addEventListener("click", function () {
var x = document.getElementById('myloader');
if (x.style.display === 'none') {
x.style.display = 'block';
} else {
x.style.display = 'none';
}
$.getJSON("https://api.coindesk.com/v1/bpi/currentprice.json", function (data) {
var x = document.getElementById('myloader');
if (x.style.display === 'none') {
x.style.display = 'block';
} else {
x.style.display = 'none';
}
$("#cointime").text(data.time.updated);
$("#dollar").text("USD : " + ' ' + data.bpi.USD.rate);
$("#gbp").text("GBP : " + ' ' + data.bpi.GBP.rate);
$("#euro").text("EUR :" + ' ' + data.bpi.EUR.rate);
})
});
</script>
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
</body>
</html>
&#13;
答案 0 :(得分:1)
要延迟AJAX请求,只需将$.getJSON
电话打包到setTimeout()
即可。另请注意,您正在使用jQuery和本机JS函数的奇怪组合。我建议使用其中一种,例如:
$("#refreshBtn").on("click", function() {
$('#myloader').show();
setTimeout(function() {
$.getJSON("https://api.coindesk.com/v1/bpi/currentprice.json", function(data) {
$('#myloader').hide()
$("#cointime").text(data.time.updated);
$("#dollar").text("USD : " + ' ' + data.bpi.USD.rate);
$("#gbp").text("GBP : " + ' ' + data.bpi.GBP.rate);
$("#euro").text("EUR :" + ' ' + data.bpi.EUR.rate);
})
}, 2500);
});
&#13;
#myloader {
position: relative;
left: 50%;
top: 50%;
z-index: 1;
width: 150px;
height: 150px;
margin: 25% -50;
border: 16px solid #000;
border-radius: 50%;
border-top: 16px solid #3498db;
width: 120px;
height: 120px;
-webkit-animation: spin 2s linear infinite;
animation: spin 2s linear infinite;
}
@-webkit-keyframes spin {
0% {
-webkit-transform: rotate(0deg);
}
100% {
-webkit-transform: rotate(360deg);
}
}
@keyframes spin {
0% {
transform: rotate(0deg);
}
100% {
transform: rotate(360deg);
}
}
/* Add animation to "page content" */
.animate-bottom {
position: relative;
-webkit-animation-name: animatebottom;
-webkit-animation-duration: 1s;
animation-name: animatebottom;
animation-duration: 1s
}
@-webkit-keyframes animatebottom {
from {
bottom: -100px;
opacity: 0
}
to {
bottom: 0px;
opacity: 1
}
}
@keyframes animatebottom {
from {
bottom: -100px;
opacity: 0
}
to {
bottom: 0;
opacity: 1
}
}
#myDiv {
display: none;
text-align: center;
}
&#13;
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
<div class="container container-table">
<div class="row vertical-center-row">
<div class="col-md-4 col-md-offset-4">
<h1 id="name">Real-time Bitcoin Price</h1>
<div id="myloader" style="display: none;"></div>
<p id="cointime"></p>
<div id="dollar"></div>
<div id="gbp"></div>
<div id="euro"></div><br>
<button id="refreshBtn" class="btn btn-primary">Load Data</button>
</div>
</div>
</div>
&#13;
另外我建议增加2.5秒的延迟太多了。我知道添加一点点延迟以使数据加载更加明显对于UX来说是一个好主意,但是我说500毫秒就足够了。
答案 1 :(得分:0)
首先 - 对象/元素:
您应始终缓存多次使用的元素。意味着:将对象分配给可在任何需要的地方访问的变量。为什么?因为您可以随意使用变量。这样可以节省大量时间和处理能力,因为您无需一次又一次地查找具有特定id
或class
的元素。在我的情况下是var x
。
第二 - 加载器:
show()
中有hide()
和jQuery
这样的简单内容,但我使用了ternary operation
。为什么?它非常灵活,因为我知道它,所以我整天都在使用它。所以我想告诉你这是一个方便的选择: - )。
第三 - 超时:
非常直接,将function
包裹在setTimeout()
中,然后你去。
这是一个工作小提琴:
编辑:现在,您可以将x.style.display
行包装在单独的function
中并调用它,以便您可以重复使用代码,而不必将其写入两次,但我认为为了示范目的,这应该没问题。
var x = document.getElementById('myloader');
document.getElementById("refreshBtn").addEventListener("click", function () {
x.style.display = (x.style.display === 'none') ? 'block' : 'none';
setTimeout(function(){
$.getJSON("https://api.coindesk.com/v1/bpi/currentprice.json", function (data) {
x.style.display = (x.style.display === 'none') ? 'block' : 'none';
$("#cointime").text(data.time.updated);
$("#dollar").text("USD : " + ' ' + data.bpi.USD.rate);
$("#gbp").text("GBP : " + ' ' + data.bpi.GBP.rate);
$("#euro").text("EUR :" + ' ' + data.bpi.EUR.rate);
});
},2500);
});
#myloader {
position: relative;
left: 50%;
top: 50%;
z-index: 1;
width: 150px;
height: 150px;
margin: 25% -50;
border: 16px solid #000;
border-radius: 50%;
border-top: 16px solid #3498db;
width: 120px;
height: 120px;
-webkit-animation: spin 2s linear infinite;
animation: spin 2s linear infinite;
}
@-webkit-keyframes spin {
0% { -webkit-transform: rotate(0deg); }
100% { -webkit-transform: rotate(360deg); }
}
@keyframes spin {
0% { transform: rotate(0deg); }
100% { transform: rotate(360deg); }
}
/* Add animation to "page content" */
.animate-bottom {
position: relative;
-webkit-animation-name: animatebottom;
-webkit-animation-duration: 1s;
animation-name: animatebottom;
animation-duration: 1s
}
@-webkit-keyframes animatebottom {
from { bottom:-100px; opacity:0 }
to { bottom:0px; opacity:1 }
}
@keyframes animatebottom {
from{ bottom:-100px; opacity:0 }
to{ bottom:0; opacity:1 }
}
#myDiv {
display: none;
text-align: center;
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="container container-table">
<div class="row vertical-center-row">
<div class="col-md-4 col-md-offset-4">
<h1 id="name" >Real-time Bitcoin Price</h1>
<div id="myloader" style="display: none;"></div>
<p id="cointime"></p>
<div id="dollar"></div>
<div id="gbp"></div>
<div id="euro"></div><br>
<button id="refreshBtn" class="btn btn-primary">Load Data</button>
</div>
</div>
</div>
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
答案 2 :(得分:0)
var timeout = null
function refresh () {
function load () {
$.getJSON('https://api.coindesk.com/v1/bpi/currentprice.json', function (data) {
$('#cointime').text(data.time.updated)
$('#dollar').text('USD : ' + data.bpi.USD.rate)
$('#gbp').text('GBP : ' + data.bpi.GBP.rate)
$('#euro').text('EUR : ' + data.bpi.EUR.rate)
timeout = null
})
}
if (timeout) {
clearTimeout(timeout)
}
timeout = setTimeout(load, 2500)
}
document.getElementById('refreshBtn').addEventListener('click', refresh)