Jquery 启用/禁用按钮文本区域验证

Jsfiddle example

例如，我想执行该操作。它不能单独工作。我把它扔进了我的服务器，当我运行它时它不起作用错误在哪里？

$( "#validateTxt" ).change(function() {
if($( "#validateTxt" ).val()=="123"){
$('#btnCheck').attr("enabled",false);
}
else{
$('#btnCheck').attr("disabled",true);
}

});

<!DOCTYPE html>
<html lang="en" >
<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title></title>

</head>
<body>
<!-- partial:index.partial.html -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/css/bootstrap.min.css" integrity="sha384-AysaV+vQoT3kOAXZkl02PThvDr8HYKPZhNT5h/CXfBThSRXQ6jW5DO2ekP5ViFdi" crossorigin="anonymous">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js" integrity="sha384-3ceskX3iaEnIogmQchP8opvBy3Mi7Ce34nWjpBIwVTHfGYWQS9jwHDVRnpKKHJg7" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.3.7/js/tether.min.js" integrity="sha384-XTs3FgkjiBgo8qjEjBk0tGmf3wPrWtA6coPfQDfFEY8AnYJwjalXCiosYRBIBZX8" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/js/bootstrap.min.js" integrity="sha384-BLiI7JTZm+JWlgKa0M0kGRpJbF2J8q+qreVrKBC47e3K6BW78kGLrCkeRX6I9RoK" crossorigin="anonymous"></script>
////üst kodlar boostrap kütüphanesini çağırıdıgım kodlar projende yoksa ekle 
<input type="text" id="validateTxt" class="form-control" placeholder="123">
<input type="button" class="btn btn-success" value="KontrolEt" id="btnCheck" disabled>
<!-- partial -->
<script  src="./script.js"></script>

</body>
</html>

你可以这样做

$('#btnCheck').attr("disabled", false);

HTML 没有enabled属性。所以你需要为disabled属性设置 false

$("#validateTxt").change(function() {
if ($("#validateTxt").val() == "123") {
$('#btnCheck').attr("disabled", false);
} else {
$('#btnCheck').attr("disabled", true);
}
});

<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title></title>
</head>
<body>
<!-- partial:index.partial.html -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/css/bootstrap.min.css" integrity="sha384-AysaV+vQoT3kOAXZkl02PThvDr8HYKPZhNT5h/CXfBThSRXQ6jW5DO2ekP5ViFdi" crossorigin="anonymous">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js" integrity="sha384-3ceskX3iaEnIogmQchP8opvBy3Mi7Ce34nWjpBIwVTHfGYWQS9jwHDVRnpKKHJg7" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.3.7/js/tether.min.js" integrity="sha384-XTs3FgkjiBgo8qjEjBk0tGmf3wPrWtA6coPfQDfFEY8AnYJwjalXCiosYRBIBZX8" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/js/bootstrap.min.js" integrity="sha384-BLiI7JTZm+JWlgKa0M0kGRpJbF2J8q+qreVrKBC47e3K6BW78kGLrCkeRX6I9RoK" crossorigin="anonymous"></script>
////üst kodlar boostrap kütüphanesini çağırıdıgım kodlar projende yoksa ekle
<input type="text" id="validateTxt" class="form-control" placeholder="123">
<input type="button" class="btn btn-success" value="KontrolEt" id="btnCheck" disabled>
<!-- partial -->
<script src="./script.js"></script>
</body>
</html>

<input>元素没有 启用的属性。

如果条件true，您可以将disabled设置为false，否则使用.removeAttr()删除该属性。

此外，我更喜欢使用input事件而不是change：

$("#validateTxt").on('input', function() {
if($("#validateTxt").val()=="123"){
$('#btnCheck').attr("disabled", true);
}
else{
$('#btnCheck').removeAttr("disabled");
}
});

<!-- partial:index.partial.html -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/css/bootstrap.min.css" integrity="sha384-AysaV+vQoT3kOAXZkl02PThvDr8HYKPZhNT5h/CXfBThSRXQ6jW5DO2ekP5ViFdi" crossorigin="anonymous">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js" integrity="sha384-3ceskX3iaEnIogmQchP8opvBy3Mi7Ce34nWjpBIwVTHfGYWQS9jwHDVRnpKKHJg7" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.3.7/js/tether.min.js" integrity="sha384-XTs3FgkjiBgo8qjEjBk0tGmf3wPrWtA6coPfQDfFEY8AnYJwjalXCiosYRBIBZX8" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/js/bootstrap.min.js" integrity="sha384-BLiI7JTZm+JWlgKa0M0kGRpJbF2J8q+qreVrKBC47e3K6BW78kGLrCkeRX6I9RoK" crossorigin="anonymous"></script>
<input type="text" id="validateTxt" class="form-control" placeholder="123">
<input type="button" class="btn btn-success" value="KontrolEt" id="btnCheck" disabled>

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