validation - Check if inputs are empty using jQuery -

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I have a form that I would like to fill in all areas. If a field is clicked and is not filled, I would like to display a red background

Here is my code: 

  $ ('# apply- Form input '). Blur (function () (if ($ ('' input: text '') (": empty") {$ (this) .parents ('p'). AddClass ('warning');}});   
  
  
  
 
 
  $ ('# apply-form input'). Blur (function () {if (! $ (.) () .val ()) {$ (This) .parents ('p') AddClass ('warning');}});  
 
 And you do not need the necessary  .length  or see if it's  & gt; 0  because the empty string treats anyway as wrong, but if you want it for readability purposes: 
 
  $ ('# apply-form input'). Blur (function () {if ($ (this) .val (). Length === 0) {$ (this) .parents ('p') AddClass ('warning');}});  
 
 If you are certain that this will always work on a text field element, then you can only use  this.value . 
 
  $ ('#in-apply input'). Blurring (work!) (If (! This.value) {$ (this) .parents ('p') AddClass ('Warning');}});  
 
 with it You should also keep in mind that  $ ('input: text')  captures multiple elements, specify references or use  this  if you only use a single element Want reference (Referral children of message / children have a textfield).

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