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Amr Elgarhy
Amr Elgarhy

Reputation: 68912

How to get browser width using JavaScript code?

I am trying to write a JavaScript function to get the current browser width.

I found this one:

console.log(document.body.offsetWidth);

But its problem that it fail if the body has width 100%.

Is there any other better function or a workaround?

Upvotes: 216

Views: 339543

Answers (11)

Berend Kemper
Berend Kemper

Reputation: 76

Since nobody else has mentioned code that calculates the viewport width.

  • Notice that this procedure excludes the vertical overflow scrollbar and only measures the viewable width of the root <html> element.
  • Notice that the root element is always present unlike the <body> element.
document.documentElement.getBoundingClientRect()['width'];
  • Notice getBoundingClientRect width can return a decimal number and clientWidth returns only integers.
document.documentElement.clientWidth;

enter image description here

Upvotes: 0

uma mahesh
uma mahesh

Reputation: 124

simple way for all browsers

window.innerWidth

Upvotes: 1

Pepotas
Pepotas

Reputation: 1

function getWidth() {
  return Math.max(
    document.body.scrollWidth,
    document.documentElement.scrollWidth,
    document.body.offsetWidth,
    document.documentElement.offsetWidth,
    document.documentElement.clientWidth
  );
}

function getHeight() {
  return Math.max(
    document.body.scrollHeight,
    document.documentElement.scrollHeight,
    document.body.offsetHeight,
    document.documentElement.offsetHeight,
    document.documentElement.clientHeight
  );
}

console.log('Width:  ' +  getWidth() );
console.log('Height: ' + getHeight() );

Upvotes: -1

burkul
burkul

Reputation: 133

An important addition to Travis' answer; you need to put the getWidth() up in your document body to make sure that the scrollbar width is counted, else scrollbar width of the browser subtracted from getWidth(). What i did ;

<body>
<script>
function getWidth(){
return Math.max(document.body.scrollWidth,
document.documentElement.scrollWidth,
document.body.offsetWidth,
document.documentElement.offsetWidth,
document.documentElement.clientWidth);
}
var aWidth=getWidth();
</script>
</body>

and call aWidth variable anywhere afterwards.

Upvotes: 1

Sergiu
Sergiu

Reputation: 1396

An adapted solution to modern JS of Travis' answer:

const getPageWidth = () => {
  const bodyMax = document.body
    ? Math.max(document.body.scrollWidth, document.body.offsetWidth)
    : 0;

  const docElementMax = document.documentElement
    ? Math.max(
        document.documentElement.scrollWidth,
        document.documentElement.offsetWidth,
        document.documentElement.clientWidth
      )
    : 0;

  return Math.max(bodyMax, docElementMax);
};

Upvotes: 0

Travis
Travis

Reputation: 12379

Update for 2017

My original answer was written in 2009. While it still works, I'd like to update it for 2017. Browsers can still behave differently. I trust the jQuery team to do a great job at maintaining cross-browser consistency. However, it's not necessary to include the entire library. In the jQuery source, the relevant portion is found on line 37 of dimensions.js. Here it is extracted and modified to work standalone:

function getWidth() {
  return Math.max(
    document.body.scrollWidth,
    document.documentElement.scrollWidth,
    document.body.offsetWidth,
    document.documentElement.offsetWidth,
    document.documentElement.clientWidth
  );
}

function getHeight() {
  return Math.max(
    document.body.scrollHeight,
    document.documentElement.scrollHeight,
    document.body.offsetHeight,
    document.documentElement.offsetHeight,
    document.documentElement.clientHeight
  );
}

console.log('Width:  ' +  getWidth() );
console.log('Height: ' + getHeight() );

Original Answer

Since all browsers behave differently, you'll need to test for values first, and then use the correct one. Here's a function that does this for you:

function getWidth() {
  if (self.innerWidth) {
    return self.innerWidth;
  }

  if (document.documentElement && document.documentElement.clientWidth) {
    return document.documentElement.clientWidth;
  }

  if (document.body) {
    return document.body.clientWidth;
  }
}

and similarly for height:

function getHeight() {
  if (self.innerHeight) {
    return self.innerHeight;
  }

  if (document.documentElement && document.documentElement.clientHeight) {
    return document.documentElement.clientHeight;
  }

  if (document.body) {
    return document.body.clientHeight;
  }
}

Call both of these in your scripts using getWidth() or getHeight(). If none of the browser's native properties are defined, it will return undefined.

Upvotes: 198

Dariux
Dariux

Reputation: 4233

Why nobody mentions matchMedia?

if (window.matchMedia("(min-width: 400px)").matches) {
  /* the viewport is at least 400 pixels wide */
} else {
  /* the viewport is less than 400 pixels wide */
}

Did not test that much, but tested with android default and android chrome browsers, desktop chrome, so far it looks like it works well.

Of course it does not return number value, but returns boolean - if matches or not, so might not exactly fit the question but that's what we want anyway and probably the author of question wants.

Upvotes: 28

user3651121
user3651121

Reputation: 101

From W3schools and its cross browser back to the dark ages of IE!

<!DOCTYPE html>
<html>
<body>

<p id="demo"></p>

<script>
var w = window.innerWidth
|| document.documentElement.clientWidth
|| document.body.clientWidth;

var h = window.innerHeight
|| document.documentElement.clientHeight
|| document.body.clientHeight;

var x = document.getElementById("demo");
x.innerHTML = "Browser inner window width: " + w + ", height: " + h + ".";

alert("Browser inner window width: " + w + ", height: " + h + ".");

</script>

</body>
</html>

Upvotes: 10

Bradley Flood
Bradley Flood

Reputation: 10569

var w = window.innerWidth;
var h = window.innerHeight;
var ow = window.outerWidth; //including toolbars and status bar etc.
var oh = window.outerHeight;

Both return integers and don't require jQuery. Cross-browser compatible.

I often find jQuery returns invalid values for width() and height()

Upvotes: 66

chaos
chaos

Reputation: 124297

It's a pain in the ass. I recommend skipping the nonsense and using jQuery, which lets you just do $(window).width().

Upvotes: 310

ismael
ismael

Reputation: 71

Here is a shorter version of the function presented above:

function getWidth() {
    if (self.innerWidth) {
       return self.innerWidth;
    }
    else if (document.documentElement && document.documentElement.clientHeight){
        return document.documentElement.clientWidth;
    }
    else if (document.body) {
        return document.body.clientWidth;
    }
    return 0;
}

Upvotes: 7

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