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.
<!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> |
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.
<!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> |
Output:
- Before clicking on the button:
- After clicking on the button:
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