bootstrap 4验证禁用提交按钮，直到表单验证

2024-05-03 • 问答

在下面的问题示例中，我需要验证两个字段。
在所有（在此情况下为2个）字段均经过验证之前，应禁用“提交”按钮。
如果两个都通过验证，则应将其启用。

我的问题：第一个字段通过验证的那一刻-按钮已启用，为时过早。
我了解（可能是这样）是因为我放置 $("#submitBtn").attr("disabled",false);

任何有关如何使其工作的提示将不胜感激。

编辑：有关仅当所有表单元素均经过验证时启用了提交按钮的完整注册表单的示例，请参见this。

<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="page2.php" id="myForm1" class="needs-validation" novalidate>
          <div class="form-group">
            <input type="text" class="form-control" pattern="^[a-z]{3,6}$" required autofocus>
            <div class="valid-feedback">Valid</div>
            <div class="invalid-feedback">a to z only (3 to 6 long)</div>
          </div>
          <div class="form-group">
            <input type="text" class="form-control" pattern="^[a-z]{3,6}$" 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 id="submitBtn" type="submit" class="btn btn-primary submit-button" disabled>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>
    window.addEventListener('load',function() {
      let currForm1 = document.getElementById('myForm1');
      // Validate on input:
      currForm1.querySelectorAll('.form-control').forEach(input => {
        input.addEventListener(('input'),() => {
          if (input.checkValidity()) {
            input.classList.remove('is-invalid')
            input.classList.add('is-valid');
            $("#submitBtn").attr("disabled",false);           <<<<======== ??????
          } else {
            input.classList.remove('is-valid')
            input.classList.add('is-invalid');
          }
        });
      });
      // Validate on submit:
      currForm1.addEventListener('submit',function(event) {
        if (currForm1.checkValidity() === false) {
          event.preventDefault();
          event.stopPropagation();
        }
        currForm1.classList.add('was-validated');
      },false);
    });
  </script>

在输入事件侦听器内部，检查所有输入是否都具有is-valid类。如果所有输入都具有is-valid类，请关闭禁用的按钮。

currForm1.querySelectorAll('.form-control').forEach(input => {
  input.addEventListener(('input'),() => {
    if (input.checkValidity()) {
      input.classList.remove('is-invalid')
      input.classList.add('is-valid');
      // $("#submitBtn").attr("disabled",false);           <<<<======== ??????
    } else {
      input.classList.remove('is-valid')
      input.classList.add('is-invalid');
    }
    var is_valid = $('.form-control').length === $('.form-control.is-valid').length;
    $("#submitBtn").attr("disabled",!is_valid);
  });
});

我不知道这是否是一种好方法，它是否满足您的需求也取决于您的要求，这样就可以了。

在这里，我要删除一些行并添加一些行

从第一个条件中删除禁用按钮代码，并在最后一个条件中添加

if(input.checkValidity() && index ===1) {
    $("#submitBtn").attr("disabled",false); 
}

<!DOCTYPE html>
<html lang="en">
<head>
  <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="page2.php" id="myForm1" class="needs-validation" novalidate>
            <div class="form-group">
              <input type="text" class="form-control" pattern="^[a-z]{3,6}$" required autofocus>
              <div class="valid-feedback">Valid</div>
              <div class="invalid-feedback">a to z only (3 to 6 long)</div>
            </div>
            <div class="form-group">
              <input type="text" class="form-control" pattern="^[a-z]{3,6}$" 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 id="submitBtn" type="submit" class="btn btn-primary submit-button" disabled>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>
      window.addEventListener('load',function() {
        let currForm1 = document.getElementById('myForm1');
        // Validate on input:
        currForm1.querySelectorAll('.form-control').forEach((input,index) => {
          input.addEventListener(('input'),() => {
            if (input.checkValidity()) {
              console.log(input.checkValidity());
              input.classList.remove('is-invalid')
              input.classList.add('is-valid');      
            } else {
              input.classList.remove('is-valid')
              input.classList.add('is-invalid');
            }
            if(input.checkValidity() && index ===1) {
              $("#submitBtn").attr("disabled",false); 
            }
          });
        });
        // Validate on submit:
        currForm1.addEventListener('submit',function(event) {
          if (currForm1.checkValidity() === false) {
            event.preventDefault();
            event.stopPropagation();
          }
          currForm1.classList.add('was-validated');
        },false);
      });
    </script>
  </body>
</html>

在假设我们可以启用它之前，我们需要检查所有其他输入是否也有效

let currForm1 = document.getElementById('myForm1');
      // Validate on input:
      currForm1.querySelectorAll('.form-control').forEach(input => {
        input.addEventListener(('input'),() => {
          if (input.checkValidity()) {
            /* IF IT PASSES WE NEED TO CHECK THE OTHER INPUTS */

            /* STORE ALL THE INPUTS THAT PASS THE CHECKVALIDITY */
            let allValid = currForm1.querySelectorAll('.form-control').filter(input => 
              { return input.checkValidity() })

            /* WE CAN NOW UPDATE THE SUBMIT BASED ON THE NUMBER OF VALID 
               INPUTS WE HAVE */
            $("#submitBtn").attr("disabled",allValid.length === currForm1.querySelectorAll('.form-control').length); 

            input.classList.remove('is-invalid')
            input.classList.add('is-valid');   
          } else {

            /* IF IT FAILS WE DONT NEED TO CHECK WE WANT THE VALIDATOR AS FALSE */
            $("#submitBtn").attr("disabled",true); 
            input.classList.remove('is-valid')
            input.classList.add('is-invalid');
          }
        });
      });

      /* FINALLY WE CAN UPDATE THE SUBMIT,BASED ON OUR VARIABLE */
      $("#submitBtn").attr("disabled",validatorForSubmit );

bootstrap 4验证禁用提交按钮，直到表单验证

FANCY905269369 回答：bootstrap 4验证禁用提交按钮，直到表单验证

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