jquery form validation with hide button submit?

Question

JavaScript

Is there a jquery plugin that validates the form and hides the submit button, if the validation fails, and if everything is fine, then submit opens.

Answer 1

In an HTML document:

<form action="">
  <input type="text" id="text">
  <input type="submit" id="submit" style="display:none;">
</form>

JavaScript (with jQ):

function validate(){
  if( $('#text').val() == 123 ){
    $('#submit').show();
  }else{
    $('#submit').hide();
  }
  }
  
  $('#text').keyup(function(){
    validate();
  });

Also you can write validation for e-mail || password || phone number, it is enough to pass the desired value to the function and process it.