Bootstrap 4表单验证

Question

我是Bootstrap的初学者，我已经看到了很多Bootstrap 3表单验证插件等，但是我没有找到Bootstrap 4的任何内容。

我正在尝试验证多种形式，这是我的代码：

<!-- Contact -->
<div class="container white">
  <div class="row">
    <div class="container white percent100">
      <div class="col-lg-12">
        <div class="padder-t2">
          <h1>Contact</h1>
          <div class="horiz-divider"></div>
        </div>
      </div>
    </div>
  </div>
  <div class="row padder-t padder-b">
    <div class="container white">
      <div class="col-lg-12">
        <!-- Form -->
        <form class="form-horizontal" action=" " method="post" id="contact_form">
          <fieldset>
            <!-- Text input-->
            <div class="form-group">
              <div class="row">
                <div class="col-md-4 col-lg-4">
                  <label class="control-label pull-right"><h4>First Name</h4></label>
                </div>
                <div class="col-md-4 col-lg-4 inputGroupContainer">
                  <div class="input-group">
                    <span class="input-group-addon"><i class="fa fa-user"></i></span>
                    <input id="firstname" name="firstname" placeholder="First Name" class="form-control" type="text">
                  </div>
                </div>
              </div>
            </div>
            <!-- Text input-->
            <div class="form-group">
              <div class="row">
                <div class="col-md-4 col-lg-4">
                  <label class="control-label pull-right"><h4>Last Name</h4></label>
                </div>
                <div class="col-md-4 col-lg-4 inputGroupContainer">
                  <div class="input-group">
                    <span class="input-group-addon"><i class="fa fa-user"></i></span>
                    <input id="lastname" name="lastname" placeholder="Last Name" class="form-control" type="text">
                  </div>
                </div>
              </div>
            </div>
            <!-- Text input-->
            <div class="form-group">
              <div class="row">
                <div class="col-md-4 col-lg-4">
                  <label class="control-label pull-right"><h4>E-Mail</h4></label>
                </div>
                <div class="col-md-4 col-lg-4 inputGroupContainer">
                  <div class="input-group">
                    <span class="input-group-addon"><i class="fa fa-envelope"></i></span>
                    <input id="email" name="email" placeholder="E-Mail Address" class="form-control" type="email">
                  </div>
                </div>
              </div>
            </div>
            <!-- Text input-->
            <div class="form-group">
              <div class="row">
                <div class="col-md-4 col-lg-4">
                  <label class="control-label pull-right"><h4>Phone #</h4></label>
                </div>
                <div class="col-md-4 col-lg-4 inputGroupContainer">
                  <div class="input-group">
                    <span class="input-group-addon"><i class="fa fa-phone"></i></span>
                    <input id="phone" name="phone" placeholder="Phone" class="form-control" type="text">
                  </div>
                </div>
              </div>
            </div>
            <!-- Text area -->
            <div class="form-group">
              <div class="row">
                <div class="col-md-4 col-lg-4">
                  <label class="control-label pull-right"><h4>Message</h4></label>
                </div>
                <div class="col-md-4 col-lg-5 inputGroupContainer">
                  <div class="input-group">
                    <span class="input-group-addon"><i class="fa fa-pencil"></i></span>
                    <textarea id="comment" class="form-control" name="comment" placeholder="Your Message"></textarea>
                  </div>
                </div>
              </div>
            </div>
            <!-- Success message -->
            <div class="alert alert-success" role="alert" id="success_message">Success <i class="fa fa-thumbs-up"></i> Thanks for contacting us, we will get back to you shortly.</div>
            <!-- Button -->
            <div class="form-group">
              <div class="row">
                <label class="col-md-4 col-lg-4 control-label"></label>
                <div class="col-md-4 col-lg-4">
                  <button type="submit" class="btn btn-danger raised">Send <i class="fa fa-paper-plane"></i></button>
                </div>
              </div>
            </div>
          </fieldset>
        </form>
      </div>
    </div>
  </div>
  <div class="row padder-b">
    <div class="row col-lg-12">
      <div class="col-md-3 col-lg-3"></div>
      <h4 class="col-md-9 col-lg-9">Contact us directly:</h4>
    </div>
    <div class="row col-lg-12">
      <div class="col-md-3 col-lg-3"></div>
      <h4 class="col-md-2 col-lg-2 padder-lr">Mail:</h4>
      <a class="col-md-6 col-lg-6 padder-lr" href="mailto:lorem@ipsum.com">
        <h4 id="mail">lorem@ipsum.com</h4>
      </a>
    </div>
    <div class="row col-lg-12">
      <div class="col-md-3 col-lg-3"></div>
      <h4 class="col-md-2 col-lg-2 padder-lr">Adress:</h4>
      <h4 class="col-md-6 col-lg-6 padder-lr" id="adress">2 LoremIpsum Road, 67000 City - Country</h4>
    </div>
  </div>
</div>

我试图修改现有的js，但是我没有运气。

这是呈现的形式：

形式的jsfiddle

Answer 1

首先，我通过Jonathan Dion建议的外部库解决了我的问题。但是最近我遇到了这个：

Bootstrap v4.0引入了自己的表单验证，您仍然可以与后端php验证配对。从文档：

<form class="needs-validation" novalidate>
  <div class="form-row">
    <div class="col-md-4 mb-3">
      <label for="validationCustom01">First name</label>
      <input type="text" class="form-control" id="validationCustom01" placeholder="First name" value="Mark" required>
      <div class="valid-feedback">
        Looks good!
      </div>
      <div class="invalid-feedback">
        Doesn't look good!
      </div>
    </div>
  </div>
</div>

然后使用JS：

<script>
// Example starter JavaScript for disabling form submissions if there are invalid fields
(function() {
  'use strict';
  window.addEventListener('load', function() {
    // Fetch all the forms we want to apply custom Bootstrap validation styles to
    var forms = document.getElementsByClassName('needs-validation');
    // Loop over them and prevent submission
    var validation = Array.prototype.filter.call(forms, function(form) {
      form.addEventListener('submit', function(event) {
        if (form.checkValidity() === false) {
          event.preventDefault();
          event.stopPropagation();
        }
        form.classList.add('was-validated');
      }, false);
    });
  }, false);
})();
</script>

这将提供输入边框着色，并根据给定的模式或属性显示有效/无效的反馈块。它通过CSS的两个伪类:invalid和来应用:valid。它适用于<input>，<select>和<textarea>元素。

Answer 2

2020年更新- Bootstrap 4.4.x

如果您想一次（实时或实时）验证每个输入，而不是等待整个表单提交，这是另一种选择（现代 JS）...

(function() {
  'use strict';
  window.addEventListener('load', function() {
    // fetch all the forms we want to apply custom style
    var inputs = document.getElementsByClassName('form-control')

    // loop over each input and watch blur event
    var validation = Array.prototype.filter.call(inputs, function(input) {

      input.addEventListener('blur', function(event) {
        // reset
        input.classList.remove('is-invalid')
        input.classList.remove('is-valid')

        if (input.checkValidity() === false) {
            input.classList.add('is-invalid')
        }
        else {
            input.classList.add('is-valid')
        }
      }, false);
    });
  }, false);
})()

<form class="container" novalidate="" action="/echo" method="POST" id="myForm">
    <div class="form-group">
        <label class="form-control-label" for="input1">Enter some input</label>
        <input type="text" class="form-control" name="input1" id="input1" 
            autocomplete="no" required>
        <div class="valid-feedback">Success! You've done it.</div>
        <div class="invalid-feedback">No, you missed this one.</div>
    </div>
    <div class="form-group">
        <label class="form-control-label" for="input2">Enter password</label>
        <input type="text" class="form-control" 
            pattern="^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,}$" 
            autocomplete="no" name="input2" id="input2">
        <div class="valid-feedback">Nice! You got this one!</div>
        <div class="invalid-feedback">At least 6 chars: 1 uppercase, 1 lowercase and numeric</div>
    </div>
    <div>
        <button type="submit" class="btn btn-secondary" id="btnSubmit">Submit</button>
    </div>
</form>

https://codeply.com/p/mzBNbAlOvQ