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Brad Robinson
Brad Robinson

Reputation: 46747

Detecting touch screen devices with Javascript

In Javascript/jQuery, how can I detect if the client device has a mouse?

I've got a site that slides up a little info panel when the user hovers their mouse over an item. I'm using jQuery.hoverIntent to detect the hover, but this obviously doesn't work on touchscreen devices like iPhone/iPad/Android. So on those devices I'd like to revert to tap to show the info panel.

Upvotes: 133

Views: 147962

Answers (16)

user3792852
user3792852

Reputation: 355

As already mentioned, a device may support both mouse and touch input. Very often, the question is not "what is supported" but "what is currently used".

For this case, you can simply register mouse events (including the hover listener) and touch events alike.

element.addEventListener('touchstart',onTouchStartCallback,false);

element.addEventListener('onmousedown',onMouseDownCallback,false);

...

JavaScript should automatically call the correct listener based on user input. So, in case of a touch event, onTouchStartCallback will be fired, emulating your hover code.

Note that a touch may fire both kinds of listeners, touch and mouse. However, the touch listener goes first and can prevent subsequent mouse listeners from firing by calling event.preventDefault().

function onTouchStartCallback(ev) {
    // Call preventDefault() to prevent any further handling
    ev.preventDefault();
    your code...
}

Further reading here.

Upvotes: 0

Code Spy
Code Spy

Reputation: 9954

if ("ontouchstart" in window || navigator.msMaxTouchPoints) {
    isTouch = true;
} else {
    isTouch = false;
}

Works every where !!

Upvotes: 10

silassare
silassare

Reputation: 107

For my first post/comment: We all know that 'touchstart' is triggered before click. We also know that when user open your page he or she will: 1) move the mouse 2) click 3) touch the screen (for scrolling, or ... :) )

Let's try something :

//--> Start: jQuery

var hasTouchCapabilities = 'ontouchstart' in window && (navigator.maxTouchPoints || navigator.msMaxTouchPoints);
var isTouchDevice = hasTouchCapabilities ? 'maybe':'nope';

//attach a once called event handler to window

$(window).one('touchstart mousemove click',function(e){

    if ( isTouchDevice === 'maybe' && e.type === 'touchstart' )
        isTouchDevice = 'yes';
});

//<-- End: jQuery

Have a nice day!

Upvotes: 4

KevBurnsJr
KevBurnsJr

Reputation: 4878

var isTouchDevice = 'ontouchstart' in document.documentElement;

Note: Just because a device supports touch events doesn't necessarily mean that it is exclusively a touch screen device. Many devices (such as my Asus Zenbook) support both click and touch events, even when they doen't have any actual touch input mechanisms. When designing for touch support, always include click event support and never assume any device is exclusively one or the other.

Upvotes: 268

OZZIE
OZZIE

Reputation: 7338

In jQuery Mobile you can simply do:

$.support.touch

Don't know why this is so undocumented.. but it is crossbrowser safe (latest 2 versions of current browsers).

Upvotes: 1

user
user

Reputation: 18529

return (('ontouchstart' in window)
      || (navigator.maxTouchPoints > 0)
      || (navigator.msMaxTouchPoints > 0));

Reason for using maxTouchPoints alongwith msMaxTouchPoints:

Microsoft has stated that starting with Internet Explorer 11, Microsoft vendor prefixed version of this property (msMaxTouchPoints) may be removed and recommends using maxTouchPoints instead.

Source : http://ctrlq.org/code/19616-detect-touch-screen-javascript

Upvotes: 8

Moin Zaman
Moin Zaman

Reputation: 25435

+1 for doing hover and click both. One other way could be using CSS media queries and using some styles only for smaller screens / mobile devices, which are the ones most likely to have touch / tap functionality. So if you have some specific styles via CSS, and from jQuery you check those elements for the mobile device style properties you could hook into them to write you mobile specific code.

See here: http://www.forabeautifulweb.com/blog/about/hardboiled_css3_media_queries/

Upvotes: 12

Mike S
Mike S

Reputation: 136

A helpful blog post on the subject, linked to from within the Modernizr source for detecting touch events. Conclusion: it's not possible to reliably detect touchscreen devices from Javascript.

http://www.stucox.com/blog/you-cant-detect-a-touchscreen/

Upvotes: 3

Prasad
Prasad

Reputation: 57

I have tested following code mentioned above in the discussion

 function is_touch_device() {
    return !!('ontouchstart' in window);
 }

works on android Mozilla, chrome, Opera, android default browser and safari on iphone... all positive ...

seems solid for me :)

Upvotes: 3

Grey Perez
Grey Perez

Reputation: 20438

Wrote this for one of my sites and probably is the most foolproof solution. Especially since even Modernizr can get false positives on touch detection.

If you're using jQuery

$(window).one({
  mouseover : function(){
    Modernizr.touch = false; // Add this line if you have Modernizr
    $('html').removeClass('touch').addClass('mouse');
  } 
});

or just pure JS...

window.onmouseover = function(){ 
    window.onmouseover = null;
    document.getElementsByTagName("html")[0].className += " mouse";
}

Upvotes: 4

Turtletrail
Turtletrail

Reputation: 103

This works for me:

function isTouchDevice(){
    return true == ("ontouchstart" in window || window.DocumentTouch && document instanceof DocumentTouch);
}

Upvotes: 2

j7m
j7m

Reputation: 1075

If you use Modernizr, it is very easy to use Modernizr.touch as mentioned earlier.

However, I prefer using a combination of Modernizr.touch and user agent testing, just to be safe.

var deviceAgent = navigator.userAgent.toLowerCase();

var isTouchDevice = Modernizr.touch || 
(deviceAgent.match(/(iphone|ipod|ipad)/) ||
deviceAgent.match(/(android)/)  || 
deviceAgent.match(/(iemobile)/) || 
deviceAgent.match(/iphone/i) || 
deviceAgent.match(/ipad/i) || 
deviceAgent.match(/ipod/i) || 
deviceAgent.match(/blackberry/i) || 
deviceAgent.match(/bada/i));

if (isTouchDevice) {
        //Do something touchy
    } else {
        //Can't touch this
    }

If you don't use Modernizr, you can simply replace the Modernizr.touch function above with ('ontouchstart' in document.documentElement)

Also note that testing the user agent iemobile will give you broader range of detected Microsoft mobile devices than Windows Phone.

Also see this SO question

Upvotes: 1

Boyan
Boyan

Reputation: 456

Google Chrome seems to return false positives on this one:

var isTouch = 'ontouchstart' in document.documentElement;

I suppose it has something to do with its ability to "emulate touch events" (F12 -> settings at lower right corner -> "overrides" tab -> last checkbox). I know it's turned off by default but that's what I connect the change in results with (the "in" method used to work in Chrome). However, this seems to be working, as far as I have tested: 

var isTouch = !!("undefined" != typeof document.documentElement.ontouchstart);

All browsers I've run that code on state the typeof is "object" but I feel more certain knowing that it's whatever but undefined :-)

Tested on IE7, IE8, IE9, IE10, Chrome 23.0.1271.64, Chrome for iPad 21.0.1180.80 and iPad Safari. It would be cool if someone made some more tests and shared the results.

Upvotes: 4

hallodom
hallodom

Reputation: 6549

Found testing for window.Touch didn't work on android but this does: 

function is_touch_device() {
  return !!('ontouchstart' in window);
}

See article: What's the best way to detect a 'touch screen' device using JavaScript?

Upvotes: 20

Mark
Mark

Reputation: 3474

I use:

if(jQuery.support.touch){
    alert('Touch enabled');
}

in jQuery mobile 1.0.1

Upvotes: 4

Halton
Halton

Reputation: 35

For iPad development I am using:

  if (window.Touch)
  {
    alert("touchy touchy");
  }
  else
  {
    alert("no touchy touchy");
  }

I can then selectively bind to the touch based events (eg ontouchstart) or mouse based events (eg onmousedown). I haven't yet tested on android.

Upvotes: -3

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