Open In App

How to validate input field while focusout ?

Improve
Improve
Like Article
Like
Save
Share
Report

The focusout() method in jQuery is used to remove the focus from the selected element. Now we will use focusout() method to validate the input field while focussing out. This method checks whether the input field is empty or not. Also, use some CSS property to display input field validation. If the input field is empty then it will display the red border input field otherwise display green border input field.

Example 1:




<!DOCTYPE html> 
<html
  
<head
    <script src=
    </script
      
    <style
        form { 
            border: 2px solid black;
            border-radius:12px;            
            width: 50%; 
            padding: 20px; 
            background-color:#fffa86;
        
        label {
            color:brown;
            font-weight:bold;
        }
        input { 
        border: 2px solid grey; 
        border-radius:12px;
            padding: 5px; 
            margin: 10px; 
            outline:none;
        }     
    </style
</head>
  
<body
    <h3>Validation if input field empty:</h3>
      
    <form>
        <label><em>Enter Name:</em></label
        <input type="text" name="name" required autocomplete="off">
        <br
        <label><em>Enter Password:</em></label
        <input type="password" name="pwd" required autocomplete="off">
        <br
        <label><em>Enter Email Id:</em></label
        <input type="email" name="eid" required autocomplete="off">
    </form
      
    <script
        $(document).ready(function() { 
            $("input").focusout(function() { 
                if($(this).val()=='') { 
                    $(this).css('border', 'solid 2px red'); 
                }
                else {
                      
                    // If it is not blank.
                    $(this).css('border', 'solid 2px green');    
                }    
            }) .trigger("focusout");
        }); 
    </script
</body
  
</html


Output:

Example 2: Validation alert if input field empty using siblings(), addClass() method.




<!DOCTYPE html> 
<html
     
<head
    <link rel="stylesheet" href=
    integrity=
"sha384-lZN37f5QGtY3VHgisS14W3ExzMWZxybE1SJSEsQp9S+oqd12jhcu+A56Ebc1zFSJ"
    crossorigin="anonymous">
      
    <script src=
    </script
      
    <style
        form { 
            border: 2px solid black;
            border-radius:12px;            
            width: 50%; 
            padding: 20px; 
            background-color:#fffa86;
        
        label {
            color:brown;
            font-weight:bold;
        }
        input { 
            border: 2px solid grey; 
            border-radius:12px;
            padding: 5px; 
            margin: 10px; 
            outline:none;
        
        .myelement {
            visibility: hidden;
         }
        .isempty:after {
            content:"<i style='color:red;' class='fas fa-thumbs-down'></i>"
        }
        .emptynot:after {
            content:"<i style='color:green;' class='fas fa-thumbs-up'></i>"
        }
    </style
</head
  
<body
    <h3>
        Validation alert if input field empty
    </h3>
      
    <form
        <div id="input1">
            <label><em>Enter Name:</em></label
            <input type="text" name="name" required autocomplete="off">
                <i style='color:grey;' class='fas '></i>
        </div>
          
        <br
      
        <div id="input2">
            <label><em>Enter Password:</em></label
            <input type="password" name="pwd" required autocomplete="off">
            <i style='color:grey;' class='fas '></i>
        </div>
          
        <br
          
        <div id="input3">
            <label><em>Enter Email Id:</em></label
            <input type="email" name="eid" required autocomplete="off">
            <i style='color:grey;' class='fas '></i>
        </div>
    </form>
      
    <script
        $(document).ready(function() {
            $('div input').focusout(function() {                   
                if($(this).val()=='' ) {  
                    var error=$(this).siblings('i');
                    error.addClass("fa-thumbs-up").css('color', 'red');
                }
                else {
                    var correct=$(this).siblings('i');
                    correct.addClass("fa-thumbs-up").css('color', 'green');
                }
            }).trigger("focusout");
        });
    </script
</body
  
 </html


Output:



Last Updated : 17 Jul, 2019
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads