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How to change Input box borders after filling the box using JavaScript ?

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  • Difficulty Level : Medium
  • Last Updated : 13 Jun, 2022

In this article, we will change the input border after filling the text on the input text field. The onchange event attribute works when the value of the element changes and selects the new value from the list.

Approach: Whenever the input value is changed with some value by the user, the onchange event attribute is triggered. After the event is fired, the value is checked if it is not null. If the user value exists, then the bottom border of the input control is changed to dotted red colour by using inline styling.

Syntax:

<element onchange = "script">

Example: In this example, we will change the border-bottom style when the user types some text in the field.

HTML




<!DOCTYPE html>
<html>
 
<body style="text-align: center;">
    <h2>GeeksForGeeks</h2>
 
    <h2>
        Change input
        borders after filling data
    </h2>
 
    <form>
        <label> NAME</label>
        <input type="text" id="fname"
                name="fname" value="">
        <input type="submit" value="submit">
    </form>
 
    <script>
        var gfg = document.getElementById("fname");
         
          gfg.onchange = function (e) {
            if (gfg.value != '') {
                e.target.style.borderBottom
                        = "4px dotted red";
            }
        };
    </script>
</body>
 
</html>


Output:

  • Before filling the text:

 

  • After filling the text:

 

Supported Browsers: 

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Opera
  • Safari

HTML is the foundation of web pages and is used for webpage development by structuring websites and web apps. You can learn HTML from the ground up by following this HTML Tutorial and HTML Examples.

JavaScript is best known for web page development but it is also used in a variety of non-browser environments. You can learn JavaScript from the ground up by following this JavaScript Tutorial and JavaScript Examples.


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