How do validate forms with complex validation requirements like credit card numbers using JQuery?

Question

Aryan Kumar · Answer

There are a few ways to validate forms with complex validation requirements like credit card numbers using JQuery.
One way is to use the validate method of the jQuery validation plugin. The validate method takes a set of rules as its argument. Each rule is a string that specifies the type of validation to perform. For example, the following rule would require the credit card number to be 16 digits long:
Code snippet
'creditcard': {
  'required': true,
  'minlength': 16
}
The jQuery validation plugin also supports a number of other validation rules, such as minlength, maxlength, regexp, and custom. For more information on the available validation rules, please refer to the jQuery validation plugin documentation.
Another way to validate forms with complex validation requirements is to use a custom validation function. A custom validation function is a function that is called by the jQuery validation plugin to validate a form field. The custom validation function must return a Boolean value. If the function returns true, then the form field is considered valid. If the function returns false, then the form field is considered invalid.
The following is an example of a custom validation function that can be used to validate credit card numbers:
Code snippet
function validateCreditCard(value) {
  // Check if the value is a valid credit card number.
  var re = /^[0-9]{16}$/;
  return re.test(value);
}
To use the custom validation function, you would simply add it to the rules object of the jQuery validation plugin. For example, the following code would use the custom validation function to validate the credit_card form field:
Code snippet
$(document).ready(function() {
  $('#myForm').validate({
    rules: {
      credit_card: {
        'required': true,
        'validateCreditCard': true
      }
    }
  });
});
By following the steps outlined above, you can easily validate forms with complex validation requirements like credit card numbers using JQuery.

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How do validate forms with complex validation requirements like credit card numbers using JQuery?

Revati S Misra

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