Phone number validation bootstrap3

Question

I am trying to create a form in my website for people to able to put phone number and submit the form. But when I type alphabets instead of numbers, it still accepted. Is there anyway I can check phone validation using Bootstrap 3?

Here is my code

<footer>
  <hr>
  <div class="container text-center">
    <h3>Subscribe for special offer</h3>
    <p>Enter your information</p>

    <form action="" class="form-inline">
      <div class="form-group">
        <label for="name">Name</label>
        <input type="text" class="form-control" id="name" placeholder="Name" required="required">
      </div>
      <div class="form-group">
        <label for="email">Email</label>
        <input type="email" class="form-control" id="email" placeholder="Email" required="required">
      </div>
      <div class="form-group">
        <label for="phone_no">Phone Number</label>
        <input type="text" name="num" data-validation="number" data-validation-allowing="negative,number" input name="color" data-validation="number" datavalidation-ignore="$" required="required" class="form-control" id="phone_no" placeholder="Phone Number">

      </div>
      <button type="submit" class="btn btn-default">Subscribe</button>
      <hr>
    </form>
    <!--End form-->

    <hr>

  </div>
  <!--End Container-->

</footer>

Answer 1

You can use it using the pattern attribute. You can generate a pattern from this link.

HTML:

<form>
  <h2>Phone Number Validation</h2>
  <label for="phonenum">Phone Number (format: xxxx-xxx-xxxx):</label><br/>
  <input id="phonenum" type="tel" pattern="^\d{4}-\d{3}-\d{4}$" required >

  <input type="submit" value="Submit">
  <p class="p">Demo by Agbonghama Collins. <a href="http://www.sitepoint.com/client-side-form-validation-html5/">See article</a>.</p>
</form>

CSS:

input[type="tel"] {
  border: 1px solid #ddd;
  padding: 4px 8px;
}
input[type="tel"]:focus {
  border: 1px solid #000;
}

input[type="submit"] {
  font-weight: bold;
  padding: 4px 8px;
  border:1px solid #000;
  background: #3b5998;
  color:#fff;
}

form {
  width: 50%;
  margin: 0 auto;
}

.p {
  padding-top: 30px;
}

Fiddle here.