通过Jquery进行表单验证：这不适用于Jquery最新版本的CDN（内容交付网络）吗？

Question

这不适用于Jquery最新版本的CDN（内容交付网络）：

Validating HTML forms is a very important aspect during form submission. jQuery helps in validating forms at client side. The following steps are required to validate a form.

Step 1: Create a Simple HTML Form
To create the form use the following code.
<h1>Fill out your information</h1>
<form id="regForm" method="post">
  <input type="text" name="fullname" id="fullname" placeholder="Your Full Name"/>
  <input type="text" name="email" id="email" placeholder="Email ID"/>
  <input type="text" name="mobileno" id="mobileno" id="mobileno" placeholder="Mobile Number" maxlength="10"/>
  <input type="text" name="address" id="address" placeholder="Address"/>
  <input type="password" name="password" id="password" value="" placeholder="Password"/>
  <input type="password" name="repassword" id="repassword" value="" placeholder="RetypePassword"/>
  <button name="submit" type="button" id="btnvalidate">Click to Submit</button>
</form>

This is the form view of the above code

第2步：包括最新的jQuery库 可以从https://jquery.com/下载最新的jquery库。将最新的库添加到HTML页面的顶部。

第3步：添加函数以验证表单 在HTML表单的“”标签内添加jquery函数。使用以下代码验证表单。

<script type="text/javascript">

  //Find the values added in form using the id of each fields. The ".val()" function finds the value added in the form fields.
  var fullname = $('#fullname').val();
  var address = $('#address').val();
  var mobileno = $('#mobileno').val();
  var email = $('#email').val();
  var indexat = email.indexOf("@"); //Index of "@" in the email field
  var indexdot = email.indexOf("."); //Index of "." in the email field
  var password = $('#password').val();
  var repassword = $('#repassword').val();
  
  //Function will execute when the button "Click to Submit" is clicked.
  $('#btnvalidate').click(function() {
	  
    //Blank field validation of fullname, mobile no and address. The function will generate an alert message if "fullname" or "mobile no" or "address" field is blank  
    if(fullname == '')
    {
	  alert('Please enter your Full Name');
	  $('#fullname').focus(); //The focus function will move the cursor to "fullname" field
    }
    else if(address == '')
    {
	  alert('Please enter your Address');
	  $('#address').focus();
    }
    else if(mobileno == '')
    {
	  alert('Please enter your Mobile Number');
	  $('#address').focus();
    }
    
    //Validation of valid email address. The function will generate an alert message if "email" field is blank or incorrect
    else if(indexat < 1 || (indexdot-indexat) < 2)
    {
	  alert('Please enter a valid Email Id');
	  $('#email').focus();
    }
    
    //Validation of password. The function will generate an alert message if "password" field is not same as "retype password".
    else if(password == '' && password != repassword)
    {
	  alert('Password and Retype password donot match');
	  $('#repassword').focus();
    }
  });
  
</script>

Answer 1

您必须在click事件中获取所有文本字段值。