我在bootstrap 4模式中遇到了一个问题，我正在尝试在输入上使用jQuery-UI的qazxsw poi函数，但它不起作用，我试过：
autocomplete该函数在没有模态的情况下工作正常，但是当我将它放在模态中的表单内时，它会停止工作。
我尝试了这篇文章.ui-front {
z-index:1001 !important;
}
的所有提示，但我没有任何成功。
这是代码：
Autocomplete issue into bootstrap modal
点击这里的工作示例。
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Auto Complete</title>
<link rel="stylesheet" href="css/jquery-ui.css">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto|Varela+Round">
<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">
<style>
.ui-autocomplete {
}
</style>
</head>
<body>
<div class="container">
<button class="btn btn-success" data-target="#modalOS" data-toggle="modal">MODAL</button>
<div class="modal fade " id="modalOS">
<div class="modal-dialog " role="document">
<div class="modal-content">
<div class="modal-header ">
<h5 class="modal-title" id="exampleModalLongTitle">MODAL</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<form id="formCadOs">
<div class="form-row ">
<div class="form-group ">
<label for="cliente">User</label>
<input type="text" class="form-control" name="txt_Cliente" id="txt_Cliente " placeholder="Cliente">
</div>
</form>
</div>
</div>
</div>
</div>
</body>
</html>
<script src="js/jquery.js"></script>
<script src="js/jquery-ui.js"></script>
<script type="text/javascript">
var availableTags = [
"ActionScript",
"AppleScript",
"Asp",
"BASIC",
"C",
"C++",
"Clojure",
"COBOL",
"ColdFusion",
"Erlang",
"Fortran",
"Groovy",
"Haskell",
"Java",
"JavaScript",
"Lisp",
"Perl",
"PHP",
"Python",
"Ruby",
"Scala",
"Scheme"
];
$( "#txt_Cliente" ).autocomplete({
source: availableTags
});
</script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>
$(document).ready(function() {
var availableTags = [
"ActionScript",
"AppleScript",
"Asp",
"BASIC",
"C",
"C++",
"Clojure",
"COBOL",
"ColdFusion",
"Erlang",
"Fortran",
"Groovy",
"Haskell",
"Java",
"JavaScript",
"Lisp",
"Perl",
"PHP",
"Python",
"Ruby",
"Scala",
"Scheme"
];
$('#modalOS').on('shown.bs.modal', function() {
$(".autocomplete").autocomplete({
source: availableTags
});
})
}).ui-autocomplete {
position: absolute;
z-index: 99999 !important;
cursor: default;
padding: 0;
margin-top: 2px;
list-style: none;
background-color: #ffffff;
border: 1px solid #ccc -webkit-border-radius: 5px;
-moz-border-radius: 5px;
border-radius: 5px;
-webkit-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
-moz-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);
}
.ui-autocomplete>li {
padding: 3px 20px;
}
.ui-autocomplete>li.ui-state-focus {
background-color: #DDD;
}
.ui-helper-hidden-accessible {
display: none;
}