Authenticate Number Field For Free

As you can see, the type attribute has been set to ?tel.? Also, it has a pattern attribute, which takes a regular expression: "[0-9]{3}-[0-9]{3}-[0-9]{4}". It will be used during the phone number validation. By using the HTML5 ?tel? input, you can do phone number validation with shorter code.

Phone number validation using a simple Regular expression 0-9]{3}[-\s\.]?[ 0-9]{4,6}$/im; return re. test(input_str); } function validateForm(event) { var phone = document. getElementById('myform_phone').

HTML Demo: <input type="tel"> <label for="phone">Enter your phone number:</label> <input type="tel" id="phone" name="phone" pattern="[0-9]{3}-[0-9]{3}-[0-9]{4}" required /> <small>Format: 123-456-7890</small>

Validation of a number If the number is assigned by a telecom authority and has a carrier and line type. The type of line assigned to the number (mobile, VoIP, toll-free, landline, etc.) To which region the number belongs to. The name of the carrier. The format of the phone number (in standard and local accepted format)

Approach: We have used isNaN() function for validation of the text field for numeric value only. Text-field data is passed in the function and if passed data is a number then isNan() returns true and if data is not a number or a combination of both number and alphabets then it returns false.

The simplest HTML validation feature is the required attribute. To make an input mandatory, add this attribute to the element. When this attribute is set, the element matches the :required UI pseudo-class and the form won't submit, displaying an error message on submission when the input is empty.

HTML Demo: <input type="tel"> <label for="phone">Enter your phone number:</label> <input type="tel" id="phone" name="phone" pattern="[0-9]{3}-[0-9]{3}-[0-9]{4}" required /> <small>Format: 123-456-7890</small>

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