如何在HTML中添加表单验证? [英] How to add form validation in HTML?

问题描述

我有一个表格:

<form method="post">                    
     <input type="text" name="name" placeholder="Name :" data-required="true" data-type="Name">
     <input type="text" name="email" placeholder="Email:" data-required="true" data-type="Email">
     <input type="text" name="phone" placeholder="Phone Number:" data-required="true" data-type="Phone">
     <select>
            <option value="" disabled selected>College Name:</option>
            <option>College 1</option>
            <option>College 2</option>
            <option>College 3</option>
            <option>College 4</option>
            <option>College 5</option>
            <option>College 6</option>
     </select>  
     <select>
            <option value="" disabled selected>Enquiry Type:</option>
            <option>MD/MS Coaching</option>
            <option>MDS Coaching</option>
            <option>DNB Coaching</option> 
     </select>
     <textarea>Message</textarea>                    
     <button class="btn btn-info" type="submit">Submit</button>
 </form>

现在，我需要向每个字段添加验证消息，例如在该字段下方以红色显示文本.

Now, I need to add the validation message to each field like displaying the text in red color below the field.

我对Javascript或JQuery不太了解.

I don't know much about Javascript or JQuery.

请帮助我将验证添加到字段中.

Please help me in adding the validation to fields.

推荐答案

尽管您可以使用HTML5本身进行验证，但我通常使用jQuery Validate Plugin.

Although you can do the validations with HTML5 itself, I generally use jQuery Validate Plugin.

您需要jQuery，然后包含jQuery Validate Plugin库.

您这样验证.我只验证了名称字段.您可以将其推广到其他领域.

Your validate like this. I have validated only for name field. You can take it forward for other fields.

var self = this;
$(document).ready(function() {
  
  
  // Right way, as suggested by @Sparky in the comments below, is to have attache validation code to the form only once.
  $("#myForm").validate({
    rules: {

      'name': { // this is value of the name attribute of your field
        required: true,
      },

      'email': {
        required: true,
        // regex: 'regex for email field goes here'
      }
    },
    messages: {
      'name': {
        required: "Name is required"
      },

      'email': {
        required: "Email is required",
        //regex: 'Error response for regex fail goes here'
      }
    }

  });
  $(".submit").click(function() {

    
    // Do a check each time before submit
    if (!$("#myForm").valid())
      alert("Form has validation errors. Cannot submit!!");
    else {
      alert("Form can be submitted!!");
      // do jQuery form submit here
    }
  });

});

.error {
  color: red;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script src="https://ajax.aspnetcdn.com/ajax/jquery.validate/1.14.0/jquery.validate.js"></script>

<form method="post" id="myForm">
  <input type="text" name="name" placeholder="Name :" data-required="true" data-type="Name">
  <input type="text" name="email" placeholder="Email:" data-required="true" data-type="Email">
  <input type="text" name="phone" placeholder="Phone Number:" data-required="true" data-type="Phone">
  <select>
    <option value="" disabled selected>College Name:</option>
    <option>College 1</option>
    <option>College 2</option>
    <option>College 3</option>
    <option>College 4</option>
    <option>College 5</option>
    <option>College 6</option>
  </select>
  <select>
    <option value="" disabled selected>Enquiry Type:</option>
    <option>MD/MS Coaching</option>
    <option>MDS Coaching</option>
    <option>DNB Coaching</option>
  </select>
  <textarea>Message</textarea>
  <button class="btn btn-info submit">Submit</button>
</form>

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