javascript - Strict validation of text field -


on form there 2 fields days , month.

i want simple validation that. once user enter month , i.e., 12 alllow go next field.

if user enters invalid month should focus again on month field , entered text should selected.

i trying use .focus() , .select() jquery function not working

this fiction validation test , can number or label.

here jsfiddle link.

<input type="text" id="days" /> <input type="text" id="month" />  jquery("#days").blur(function(){     if(jquery(this).val() == "12"){         alert("valid");     }     else {         alert("invalid");         jquery(this).focus().select();             }   }); 

$(function({ $('#days').attr("disabled", true); }); $("#months").blur(function(){     if($(this).val()<1 || $(this).val()>12){        $(this).val() = "error, invalid month";        $(this).css('color', 'red');        $(this).focus();        $('#days').attr("disabled", true);        return;     }  else {  $('#days').attr("disabled", false); }       }         });

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