在Bootstrap 4表单中组合客户端和服务器端验证

Question

在Bootstrap 4表单中组合客户端和服务器端验证

Bio*_*eek 6 validation cherrypy bootstrap-4

我有一个带有输入字段的Bootstrap 4表单,称为runname.我想在输入字段上执行以下验证:

runname 不能为空
runname 不能包含空格
runname以前不能使用

我已经有一个表单的代码,如果输入字段为空,则使用自定义Bootstrap样式给出错误:

// 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);
})();

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<html lang="en">

<head>
  <!-- Required meta tags -->
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <!-- Bootstrap CSS -->
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" integrity="sha384-WskhaSGFgHYWDcbwN70/dfYBj47jz9qbsMId/iRN3ewGhXQFZCSftd1LZCfmhktB" crossorigin="anonymous">
</head>

<body class="bg-light">
  <div class="container">
    <div class="col-md-12 order-md1">
      <form class="needs-validation" novalidate method="post" action="#">
        <div class="form-group row">
          <label for="inputRunname" class="col-sm-2 col-form-label">Run name</label>
          <div class="col-sm-10">
            <input type="text" class="form-control" id="inputRunname" name="runname" placeholder="Run name" required>
            <div class="invalid-feedback">
              Please enter a run name
            </div>
          </div>
        </div>
        <div class="form-group row">
          <div class="col-sm-10">
            <button type="submit" class="btn btn-primary">Submit</button>
          </div>
        </div>
      </form>
    </div>
  </div>
  <!-- Optional JavaScript -->
  <!-- jQuery first, then Popper.js, then Bootstrap JS -->
  <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js" integrity="sha384-smHYKdLADwkXOn1EmN1qk/HfnUcbVRZyYmZ4qpPea6sjB/pTJ0euyQp0Mk8ck+5T" crossorigin="anonymous"></script>

</body>

</html>

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我有一些Javascript来检查输入是否包含空格:

function cannotContainWhiteSpace(input, errorId, name) {
  var value = input.value;
  var errMsgHolder = document.getElementById(errorId);
  if (!(/^\S*$/.test(value))) {
    errMsgHolder.innerHTML =
      'The ' + name + ' cannot contain whitespace';
    input.focus();
    return false;
  }
}

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我在Cherrypy后端也有一些Python代码,它在数据库中查找是否runname已经存在:

try:
    myConnection = mysql.connector.connect(host=self.database['host'], user=self.database['user'], passwd=self.database['passwd'], db=self.database['db'])
    cursor = myConnection.cursor(buffered=True)

    # unless overriden by the force flag, check whether the runname has already been used before
    if not force:
        reusedrunquery = "SELECT run FROM logs WHERE run = %s AND errormessage IS NULL"
        cursor.execute(reusedrunquery, (runname,))
        if cursor.fetchall():
            flag = True
            cherrypy.session['reusedRun'] = True
    myConnection.close()
except mysql.connector.Error as err:
    return self.database_failure(str(err))

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但是我不知道如何将所有这些不同的部分组合在一起以获得一个表单,其中我同时具有两个客户端验证和服务器端验证.

Answer 1

Tes*_*kin 3

在提交事件中，您的后端应该有一个方法来实际拦截请求，我认为您应该能够与后端的逻辑建立连接。

以下是步骤：

表单编译正确
Http POST 请求启动onSubmit事件
后端接收请求并通过收集负责接收 Http POST 请求的方法上的数据来应用进一步的逻辑

否则，您可以尝试进行AJAX调用，在该调用上将执行客户端验证，然后它将调用服务器端方法/类来检查是否runname已使用。

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