How to assign a value to a variable in JQUERY

if($('#error-email-id').val() === '' || 
  ($("#error-email-id").val()) === 'Please enter email ID' || 
  (!filter.test($("#error-email-id").val())) )

{

here I want that the the 开发者_开发技巧value in the field remains "Please Enter email id". But When I enter wrong id say "afafaf.com" then after validating it remains "afafaf.com" But I want if it fails the validation it should be "Please Enter email id"

 return false;
}

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You can set the value using .val(value) method

$("#error-email-id").val("Please enter email ID");

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Then just set it as value:

if( /* ... lots of conditions here ... */) {
   $("#error-email-id").val('Please enter email ID'); 
   return false;
}

See the documentation of .val().

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Assign it explicitly inside your validation

$("#error-email-id").val('Please enter email ID')