将输入值克隆到另一个输入值 [英] clone input value to another input value
本文介绍了将输入值克隆到另一个输入值的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在尝试做的是当我更新名为 foo 的输入文本ID时，它应该在输入文本ID上实时更新，名为 goo 。我已经接近这个解决方案，但我认为它不起作用。请检查。
What I'm trying to do is when I update input text ID called foo it should be updated real time on input text id called goo. I already close to this solution I think but somehow it is not working. please check.
$('#foo').keyup(updatetxt);
$('#foo').keydown(updatetxt);
var foo = $('#foo');
function updatetxt() {
$('#goo').val(foo);
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="http://code.jquery.com/jquery-1.11.1.js" type="text/javascript"></script>
<input type="text" id="foo" value="something">
<input type="text" id="goo" disabled="disabled" value="something">
推荐答案
您要将元素分配给 val（）然而你需要更新值，这应该发生在函数中。
You are assigning the element to val() whereas you need to update the value and that should happen into the function.
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="http://code.jquery.com/jquery-1.11.1.js" type="text/javascript"></script>
</head>
<body>
<input type="text" id="foo" value="something">
<input type="text" id="goo" disabled="disabled" value="something">
<script type='text/javascript'>
$('#foo').keyup(updatetxt);
//$('#foo').keydown(updatetxt);
//var foo = $('#foo').val();
function updatetxt() {
$('#goo').val($('#foo').val());
}
</script>
</body>
</html>
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