引导程序4:将“滚动到第一个无效字段"添加到引导程序4中.到“不提交"如果脚本无效 [英] Bootstrap 4: add a "scroll to first invalid field" to a don't "Submit" if invalid script

问题描述

我正在使用Bootstrap 4，并且如果任何字段对以下脚本无效，我将停止提交表单. 我试图弄清楚(到目前为止没有成功)我需要在" event.stopPropagation(); "之后添加什么代码，以使表单滚动到找到的第一个无效字段. 感谢您的帮助，谢谢.

I am using Bootstrap 4 and i am stopping form submission if any of the fields are invalid with the below script. I am trying to figure out (with no success so far) what code do i need to add after the "event.stopPropagation();" in order to make the form scroll to the first invalid field that was found. Appreciate your help, thanks.

表格:

<form class="needs-validation" novalidate action="search.php" id="firstform" method="post" >

如果无效则阻止提交:

  <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>

找到了以下代码，但找不到将其嵌入禁用表单提交"脚本或将其用作独立脚本的方法:

Found the below code but couldn't find a way to embed it into the "disabling form submissions" script or use it as a standalone script:

$("#firstform").validate({
    focusInvalid: false,
    invalidHandler: function(form, validator) {

        if (!validator.numberOfInvalids())
            return;

        $('html, body').animate({
            scrollTop: $(validator.errorList[0].element).offset().top
        }, 2000);

    }
});

推荐答案

您应该使用添加到元素的input.form-control:invalid伪选择器，您将看到将:invalid和:valid样式应用于表单控件.

You should use the input.form-control:invalid pseudo selector that is added to the elements you’ll see the :invalid and :valid styles applied to your form controls.

尽管使用自定义验证，但您必须查找许多 article 可以为您遮盖.

Although using custom validation you have to look for a lot of things that this article can cover up for you.

我们将使用上面的选择器document.querySelectorAll("input.form-control:invalid");获取所有错误字段列表，并滚动到表单中的第一个错误元素，以防出现多个错误.

We will use the above selector document.querySelectorAll("input.form-control:invalid"); to get all the error fields list and scroll to the first error element in the form in case there are multiple errors.

请参阅下面的演示.

// 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();

          var errorElements = document.querySelectorAll(
            "input.form-control:invalid");
          errorElements.forEach(function(element) {
            element.parentNode.childNodes.forEach(function(node) {
              if (node.className == 'valid-feedback') {
                node.className = 'invalid-feedback';
                node.innerText =
                  'Please choose a Gender';
              }
            });
          });
          $('html, body').animate({
            scrollTop: $(errorElements[0]).offset().top
          }, 2000);
        }
        form.classList.add('was-validated');
      }, false);
    });
  }, false);
})();

input[type=text],
input[type=email],
input[type=number],
textarea,
fieldset {
  /* required to properly style form 
   elements on WebKit based browsers */
  -webkit-appearance: none;
  width: 100%;
  border: 1px solid #333;
  margin: 0;
  font-family: inherit;
  font-size: 90%;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

<form class="needs-validation" novalidate>
  <div class="form-row">
    <div class="col-md-4 mb-3">
      <label for="gender">Male</label>
      <input id="gender_male" type="radio" name="gender" class="form-control col-sm-2" required>
      <label for="gender">Female</label>
      <input id="gender_female" type="radio" name="gender" class="form-control col-sm-2">
      <label for="gender">Other</label>
      <input id="gender_other" type="radio" name="gender" class="form-control col-sm-2">

      <div class="valid-feedback">
        Looks good!
      </div>
    </div>
  </div>
  <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>
    <div class="col-md-4 mb-3">
      <label for="validationCustom02">Last name</label>
      <input type="text" class="form-control" id="validationCustom02" placeholder="Last name" value="Otto" required>
      <div class="valid-feedback">
        Looks good!
      </div>
    </div>

  </div>
  <div class="form-row">
    <div class="col-md-4 mb-3">
      <label for="validationCustomUsername">Username</label>
      <div class="input-group">
        <div class="input-group-prepend">
          <span class="input-group-text" id="inputGroupPrepend">@</span>
        </div>
        <input type="text" class="form-control" id="validationCustomUsername" placeholder="Username" aria-describedby="inputGroupPrepend" required>
        <div class="invalid-feedback">
          Please choose a username.
        </div>
      </div>
    </div>
  </div>
  <div class="form-row">
    <div class="col-md-6 mb-3">
      <label for="validationCustom03">City</label>
      <input type="text" class="form-control" id="validationCustom03" placeholder="City" required>
      <div class="invalid-feedback">
        Please provide a valid city.
      </div>
    </div>

  </div>
  <div class="form-row">
    <div class="col-md-3 mb-3">
      <label for="validationCustom04">State</label>
      <input type="text" class="form-control" id="validationCustom04" placeholder="State" required>
      <div class="invalid-feedback">
        Please provide a valid state.
      </div>
    </div>
    <div class="col-md-3 mb-3">
      <label for="validationCustom05">Zip</label>
      <input type="text" class="form-control" id="validationCustom05" placeholder="Zip" required>
      <div class="invalid-feedback">
        Please provide a valid zip.
      </div>
    </div>
  </div>
  <div class="form-row">
    <div class="col-md-3 mb-3">
      <label for="validationCustom05">Zip</label>
      <input type="text" class="form-control" id="validationCustom05" placeholder="Zip" required>
      <div class="invalid-feedback">
        Please provide a valid zip.
      </div>
    </div>
  </div>
  <div class="form-group">
    <div class="form-check">
      <input class="form-check-input" type="checkbox" value="" id="invalidCheck" required>
      <label class="form-check-label" for="invalidCheck">
                Agree to terms and conditions
            </label>
      <div class="invalid-feedback">
        You must agree before submitting.
      </div>
    </div>
  </div>
  <button class="btn btn-primary" type="submit">Submit form</button>
</form>

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