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.

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<!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>                    

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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.











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<!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> 



















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Output:


    

  • 
Before clicking on the button:
    


    • 

  • 
After clicking on the button:
    


    • 



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