用户键入时引导 4 表单验证

Question

我在一个简单的 index.php 中重新创建了我的问题，带有 2 个输入和 1 个按钮，重定向到 page2.php。
我有 BS-4 表单验证并且输入标签有一个正则表达式模式。

问题 1：仅在我单击按钮后才进行验证。 不是我打字的时候。
问题 2：当刷新并且不输入任何内容时，按钮将我重定向到 page2.php。

我认为罪魁祸首是： addEventListener('load')但我不确定，因为我是 PHP、JS、Bootstrap 和一般生活的新手……

非常感谢任何想法！

这是代码：

 <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"> <style> input[type="submit"]:disabled { background-color: red; } </style> </head> <body> <div class="container mt-2"> <div class="row"> <div class="col-md-4 offset-md-4"> <form action="page1.php" id="myForm1" class="was-validation" novalidate> <div class="form-group"> <input type="text" class="form-control" pattern="^[az]{3,6}$" autofocus> <div class="valid-feedback">Valid.</div> <div class="invalid-feedback">a to z only (3 to 6 long)</div> </div> <div class="form-group"> <input type="text" class="form-control" pattern="^[az]{3,6}$" autofocus> <div class="valid-feedback">Valid.</div> <div class="invalid-feedback">a to z only (3 to 6 long)</div> </div> <div class="form-group"> <button type="submit" class="btn btn-primary">Submit</button> </div> </form> </div> </div> </div> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script> <script> (function() { window.addEventListener('load', function() { let currForm1 = document.getElementById('myForm1'); currForm1.addEventListener('submit', function(event) { if (currForm1.checkValidity() === false) { event.preventDefault(); event.stopPropagation(); } currForm1.classList.add('was-validated'); }, false); }); })(); </script>

Answer 1

如果您不想在任何输入为空时提交表单，则需要为其添加required属性，这是一个示例：

 window.addEventListener('load', function() { let currForm1 = document.getElementById('myForm1'); currForm1.addEventListener('submit', function(event) { if (currForm1.checkValidity() === false) { event.preventDefault(); event.stopPropagation(); } currForm1.classList.add('was-validated'); }, false); // Validate on input: currForm1.querySelectorAll('input').forEach((input) => { input.addEventListener('input', () => { if (input.checkValidity()) { input.classList.remove('is-invalid') input.classList.add('is-valid'); } else { input.classList.remove('is-valid') input.classList.add('is-invalid'); } }); }); });

 <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"> <style> input[type="submit"]:disabled { background-color: red; } </style> </head> <body> <div class="container mt-2"> <div class="row"> <div class="col-md-4 offset-md-4"> <form action="page1.php" id="myForm1" class="was-validation" novalidate="z"> <div class="form-group"> <input type="text" class="form-control" pattern="^[az]{3,6}$" autofocus required> <div class="valid-feedback">Valid.</div> <div class="invalid-feedback">a to z only (3 to 6 long)</div> </div> <div class="form-group"> <input type="text" class="form-control" pattern="^[az]{3,6}$" autofocus required> <div class="valid-feedback">Valid.</div> <div class="invalid-feedback">a to z only (3 to 6 long)</div> </div> <div class="form-group"> <button type="submit" class="btn btn-primary">Submit</button> </div> </form> </div> </div> </div> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>