jQuery – Validate the form when the submit button is clicked

Here is a simple jQuery script which could use the validate a mandatory input.

(function ($) {
  $(document).ready(function() {    
      var x = $('<input-id>').val();
      if (x == null || x == '';) {
        alert('Please fill in the input.');


Done =)

Reference: StackOverflow – Intercept a click on submit button and check validity of form jQuery


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