<!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">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<title>Bootstrap 101 Template</title>
<!-- Bootstrap -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<script type="text/javascript" src="jquery.min.js"></script>
</head>
<body>
<style>
.form-control {
margin-bottom: 15px;
}
</style>
<nav class="navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<a class="navbar-brand" href="#">
<h2 style="margin: 0px; padding: 0px;">Billing Calculator</h2>
</a>
</div>
</div>
</nav>
<div class="col-md-2">
<form class="navbar-form navbar-left" role="search">
<div class="form-group">
<input type="date" class="form-control date" placeholder="Search">
<input type="date" class="form-control date" placeholder="Search">
<input type="date" class="form-control date" placeholder="Search">
<input type="date" class="form-control date" placeholder="Search">
<input type="date" class="form-control date" placeholder="Search">
<input type="date" class="form-control date" placeholder="Search">
<input type="date" class="form-control date" placeholder="Search">
</div>
</form>
</div>
<div class="col-md-3">
<form class="navbar-form navbar-left" role="search">
<div class="form-group">
<input type="text" class="form-control" id="one" placeholder="hours">
<input type="text" class="form-control" id="two" placeholder="hours">
<input type="text" class="form-control" id="three" placeholder="hours">
<input type="text" class="form-control" id="four" placeholder="hours">
<input type="text" class="form-control" id="five" placeholder="hours">
<input type="text" class="form-control" id="six" placeholder="hours">
<input type="text" class="form-control" id="seven" placeholder="hours">
<button type="submit" class="btn btn-default" id="click">Calculate</button>
</div>
</form>
</div>
<div class="col-md-1">
<form class="navbar-form navbar-left" role="search">
<div class="form-group">
<label for="form-control">Total Hours:</label>
<label for="form-control" id="totalHours">.</label>
</div>
</form>
</div>
<script type="text/javascript">
var hoursOne = parseFloat(document.getElementById("one").value);
document.getElementById("click").onclick = function(){
alert(hoursOne);
}
</script>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>
</body>
</html>
我正在尝试从文本输入中检索一个数字,即使我使用NaN
,它也始终会提醒innerHTML
。该计划是一个计费计算器,它接收工作小时数并返回总小时数。日期与值之间并没有太大关系,但可以帮助用户跟踪。
答案 0 :(得分:1)
int permits = theUnsafe.getInt(object, offset);
if (!enough(permits))
permits = theUnsafe.getVolatileInt(object, offset);
在填写表单之前,您的代码会被执行。您需要获取函数内的数据。
答案 1 :(得分:0)
将混乱减少到重要的地位,你有:
<form class="navbar-form navbar-left" role="search">
<div class="form-group">
<input type="text" class="form-control" id="one" placeholder="hours">
<button type="submit" class="btn btn-default" id="click">Calculate</button>
</div>
</form>
<script type="text/javascript">
var hoursOne = parseFloat(document.getElementById("one").value);
document.getElementById("click").onclick = function(){
alert(hoursOne);
}
</script>
因此,您在页面加载时设置 hoursOne 的值,而不是将其重置为输入的当前值。因此值为“”(空字符串),parseFloat("")
为 NaN 。您需要做的是在单击按钮时获取值。
另外,给控件一个名称以便它可以成功,并给一个默认值,这样如果用法出错就只返回NaN:
document.getElementById("click").onclick = function(){
alert(parseFloat(parseFloat(this.form.hoursOne.value)));
}
<form>
<label for="one">Hours:
<input type="text" class="form-control" id="one" name="hoursOne" value="0">
</label>
<button type="button" id="click">parseFloat</button>
</form>
最后,您不应该使用占位符而不是使用带有所需格式提示的正确标签。如果您使用占位符作为标签,一旦用户输入了某些内容,他们将无法再看到该标签,也不知道输入的内容。