jQuery - simple input validation - empty and not empty

Question

I have an input that I want to validate    lt input type  text  id  input    gt    And here s the JS           jQuery   input   live  change   function                  if   input not  empty                      alert  not empty                                  else if   input empty                     alert  empty                                 Even when the   input  is empty there s no way of displaying alert with  empty  message  So  basically  no matter what I do  only the first statement is true and the second is false  always   What s wrong

User · Answer

You could do this      input   blur function        if   this  val                   alert  empty                 http   jsfiddle net jasongennaro Y5P9k 1   When the input has lost focus that is  blur    then check the value of the  input     If it is empty       then trigger the alert

User · Answer

JQuery s  empty selector selects all elements on the page that are empty in the sense that they have no child elements  including text nodes  not all inputs that have no text in them   Jquery  How to check if an input element has not been filled in   Here s the code stolen from the above thread       apply-form input   blur function              whenever you click off an input element                          if     this  val                              if it is blank            alert  empty                    This works because an empty string in JavaScript is a  falsy value   which basically means if you try to use it as a boolean value it will always evaluate to false  If you want  you can change the conditional to   this  val          for added clarity   D

User · Answer

Actually there is a simpler way to do this  just  if     quot  input quot   is   empty      console log  empty      else   console log  not empty       src  https   www geeksforgeeks org how-to-check-an-html-element-is-empty-using-jquery

User · Answer

jQuery   input   live  change   function                since we check more than once against the value  place it in a var          var inputvalue       input   attr  value                if it s value   IS NOT              if inputvalue                       jQuery this  css  outline    solid 1px red                              else if it s value   IS              else if inputvalue                       alert  empty

[jquery] jQuery - simple input validation - "empty" and "not empty"

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