How to get the width of device screen in JavaScript ?

Given an HTML document which is running on a device. The task is to find the width of the working screen device using JavaScript.

Example 1: This example uses window.innerWidth to get the width of device screen. The innerWidth property is used to return the width of the device.

filter_none

edit
close

play_arrow

link
brightness_4
code

<!DOCTYPE HTML> 
<html
    <head
        <title
            How to get the device screen width in JavaScript ?
        </title>
    </head
      
    <body style = "text-align:center;"
      
        <h1 style = "color:green;"
            GeeksForGeeks
        </h1>
      
        <p id = "GFG_UP" style
            "font-size: 19px; font-weight: bold;">
        </p>
          
        <button onclick = "GFG_Fun()">
            click here
        </button>
          
        <p id = "GFG_DOWN" style =
            "color: green; font-size: 24px; font-weight: bold;">
        </p>
          
        <!-- Script to display the device screen width -->
        <script>
            var el_up = document.getElementById("GFG_UP");
            var el_down = document.getElementById("GFG_DOWN");
              
            el_up.innerHTML = "Click on the button to get the"
                    + " width of the device's screen"; 
              
            function GFG_Fun() {
                var width = window.innerWidth;
                el_down.innerHTML = width + " pixels";
            }
        </script
    </body
</html>                    

chevron_right


Output:



  • Before clicking on the button:
  • After clicking on the button:

Example 2: This example uses document.documentElement.clientWidth method to get the width of device screen.

filter_none

edit
close

play_arrow

link
brightness_4
code

<!DOCTYPE HTML> 
<html
    <head
        <title
            How to get the device screen width in JavaScript ?
        </title>
    </head
      
    <body style = "text-align:center;"
      
        <h1 style = "color:green;"
            GeeksForGeeks
        </h1>
      
        <p id = "GFG_UP" style
            "font-size: 19px; font-weight: bold;">
        </p>
          
        <button onclick = "GFG_Fun()">
            click here
        </button>
          
        <p id = "GFG_DOWN" style =
            "color: green; font-size: 24px; font-weight: bold;">
        </p>
          
        <!-- Script to display the device screen width -->
        <script>
            var el_up = document.getElementById("GFG_UP");
            var el_down = document.getElementById("GFG_DOWN");
              
            el_up.innerHTML = "Click on the button to get the"
                    + " width of the device's screen"; 
              
            function GFG_Fun() {
                el_down.innerHTML =
                    document.documentElement.clientWidth + " pixels";
            }
        </script
    </body
</html>

chevron_right


Output:

  • Before clicking on the button:
  • After clicking on the button:


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.