我正在尝试构建一个具有在页面加载时打开的模式的工具，然后用户将文本粘贴到textarea并提交。之后，应该运行一个函数，该函数返回该文本的子字符串，用于特定数量的字符。
目前我是控制台记录正确的子字符串，但在我单击提交按钮后，模式再次运行。我只希望模态在页面加载时运行一次。
有人可以提供一些指导吗？
$(window).on('load',function() {
$('#myModal').modal('show');
});
function myFunction(info) {
var info = $('#textArea').val();
var result = info.substring(0, 66);
$('#result').html(result);
console.log(result);
}.container >* {
margin:20px auto;
width: 80%;
}<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/4.0.0-beta.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
</head>
<body>
<!-- The Modal -->
<div class="modal fade" id="myModal">
<div class="modal-dialog">
<div class="modal-content">
<!-- Modal Header -->
<div class="modal-header">
<h4 class="modal-title">Welcome to my Bringhurst Rule Tool</h4>
<button type="button" class="close" data-dismiss="modal">×</button>
</div>
<!-- Modal body -->
<div class="modal-body">
<p>Bringhurst introduces designers to the "66 character rule," which states that 66 characters including special characters and spaces at a font-size of 16px is the ideal width for a single line of type in order to achieve maximum clarity and readability.</p>
<p>Close the modal to see what your 66 characters look like.</p>
</div>
<!-- Modal footer -->
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
</div> <!-- footer end -->
</div> <!-- modal-content end -->
</div> <!-- modal dialog end -->
</div> <!-- mymodal end -->
<div class="container">
<header><h1>Bringhurst Rule</h1></header>
<form class="align-center">
<div class="form-group">
<label for="textArea"></label>
<textarea class="form-control" id="textArea" rows="3" placeholder="Paste your text here..."></textarea>
</div>
<button type="submit" class="btn btn-info" onclick="myFunction()">Get the substring!</button>
</form>
</div>
<div id="result"></div>
</body>
答案 0 :(得分：0)
有更好的方法可以做你正在做的事情，比如使用jQuery的花哨事件处理程序而不是使用内联事件处理程序，但对你的问题最简单的答案是在事件上返回false ...通过进行两次更改来做到这一点..
onclick="return myFunction()"（在那里添加return）return false。通过返回false，您将阻止默认操作，即提交表单。
或者，您可以删除表单本身或将提交按钮更改为常规按钮。
$(window).on('load',function() {
$('#myModal').modal('show');
});
function myFunction(info) {
var info = $('#textArea').val();
var result = info.substring(0, 66);
$('#result').html(result);
console.log(result);
return false;
}.container >* {
margin:20px auto;
width: 80%;
}<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/4.0.0-beta.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
</head>
<body>
<!-- The Modal -->
<div class="modal fade" id="myModal">
<div class="modal-dialog">
<div class="modal-content">
<!-- Modal Header -->
<div class="modal-header">
<h4 class="modal-title">Welcome to my Bringhurst Rule Tool</h4>
<button type="button" class="close" data-dismiss="modal">×</button>
</div>
<!-- Modal body -->
<div class="modal-body">
<p>Bringhurst introduces designers to the "66 character rule," which states that 66 characters including special characters and spaces at a font-size of 16px is the ideal width for a single line of type in order to achieve maximum clarity and readability.</p>
<p>Close the modal to see what your 66 characters look like.</p>
</div>
<!-- Modal footer -->
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
</div> <!-- footer end -->
</div> <!-- modal-content end -->
</div> <!-- modal dialog end -->
</div> <!-- mymodal end -->
<div class="container">
<header><h1>Bringhurst Rule</h1></header>
<form class="align-center">
<div class="form-group">
<label for="textArea"></label>
<textarea class="form-control" id="textArea" rows="3" placeholder="Paste your text here..."></textarea>
</div>
<button type="submit" class="btn btn-info" onclick="return myFunction()">Get the substring!</button>
</form>
</div>
<div id="result"></div>
</body>
答案 1 :(得分：0)
您应该阻止在子网站后重新加载页面，并且可以返回false onclick个事件;
<button type="submit" class="btn btn-info" onclick="myFunction(); return false;">Get the substring!</button>
$(window).on('load',function() {
$('#myModal').modal('show');
});
function myFunction() {
var info = $('#textArea').val();
var result = info.substring(0, 66);
$('#result').html(result);
console.log(result);
}.container >* {
margin:20px auto;
width: 80%;
}<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/4.0.0-beta.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.6/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
<body>
<!-- The Modal -->
<div class="modal fade" id="myModal">
<div class="modal-dialog">
<div class="modal-content">
<!-- Modal Header -->
<div class="modal-header">
<h4 class="modal-title">Welcome to my Bringhurst Rule Tool</h4>
<button type="button" class="close" data-dismiss="modal">×</button>
</div>
<!-- Modal body -->
<div class="modal-body">
<p>Bringhurst introduces designers to the "66 character rule," which states that 66 characters including special characters and spaces at a font-size of 16px is the ideal width for a single line of type in order to achieve maximum clarity and readability.</p>
<p>Close the modal to see what your 66 characters look like.</p>
</div>
<!-- Modal footer -->
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
</div> <!-- footer end -->
</div> <!-- modal-content end -->
</div> <!-- modal dialog end -->
</div> <!-- mymodal end -->
<div class="container">
<header><h1>Bringhurst Rule</h1></header>
<form class="align-center">
<div class="form-group">
<label for="textArea"></label>
<textarea class="form-control" id="textArea" rows="3" placeholder="Paste your text here..."></textarea>
</div>
<button type="submit" class="btn btn-info" onclick="myFunction(); return false;">Get the substring!</button>
</form>
</div>
<div id="result"></div>
</body>