Disable double-tap “zoom” option in browser on tou

2019-01-07 08:27发布

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问题:

I want to disable the double-tap zoom functionality on specified elements in the browser (on touch devices), without disabling all the zoom functionality.

For example: One element can be tapped multiple times for something to happen. This works fine on desktop browsers (as expected), but on touch device browsers, it will zoom in.

回答1:

<head>
<title>Site</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0"> 
etc...
</head>

I've used that very recently and it works fine on iPad. Haven't tested on Android or other devices (because the website will be displayed on iPad only).

回答2:

I know this may be old, but I found a solution that worked perfectly for me. No need for crazy meta tags and stopping content zooming.

~~I'm not 100% sure how cross-device it is~~, but it worked exactly how I wanted to.

$('.no-zoom').bind('touchend', function(e) {
  e.preventDefault();
  // Add your code here. 
  $(this).click();
  // This line still calls the standard click event, in case the user needs to interact with the element that is being clicked on, but still avoids zooming in cases of double clicking.
})

This will simply disable the normal tapping function, and then call a standard click event again. This prevents the mobile device from zooming, but otherwise functions as normal.

EDIT: This has now been time-tested and running in a couple live apps. Seems to be 100% cross-browser and platform. The above code should work as a copy-paste solution for most cases, unless you want custom behavior before the click event.

回答3:

I just wanted to answer my question properly as some people do not read the comments below an answer. So here it is:

(function($) {
  $.fn.nodoubletapzoom = function() {
      $(this).bind('touchstart', function preventZoom(e) {
        var t2 = e.timeStamp
          , t1 = $(this).data('lastTouch') || t2
          , dt = t2 - t1
          , fingers = e.originalEvent.touches.length;
        $(this).data('lastTouch', t2);
        if (!dt || dt > 500 || fingers > 1) return; // not double-tap

        e.preventDefault(); // double tap - prevent the zoom
        // also synthesize click events we just swallowed up
        $(this).trigger('click').trigger('click');
      });
  };
})(jQuery);

I did not write this, i just modified it. I found the iOS-only version here: https://gist.github.com/2047491 (thanks Kablam)

回答4:

If you need a version that works without jQuery, I modified Wouter Konecny's answer (which was also created by modifying this gist by Johan Sundström) to use vanilla JavaScript.

function preventZoom(e) {
  var t2 = e.timeStamp;
  var t1 = e.currentTarget.dataset.lastTouch || t2;
  var dt = t2 - t1;
  var fingers = e.touches.length;
  e.currentTarget.dataset.lastTouch = t2;

  if (!dt || dt > 500 || fingers > 1) return; // not double-tap

  e.preventDefault();
  e.target.click();
}

回答5:

You should set the css property touch-action to none as described in this other answer https://stackoverflow.com/a/42288386/1128216

.disable-doubletap-to-zoom {
    touch-action: none;
}

回答6:

Add touch-action: manipulation to any element on which you want to disable double tap zoom, like with the following disable-dbl-tap-zoom class:

.disable-dbl-tap-zoom {
  touch-action: manipulation;
}

From the touch-action docs (emphasis mine):

manipulation

Enable panning and pinch zoom gestures, but disable additional non-standard gestures such as double-tap to zoom.

I tried other answers on this page, but this is the simplest and most reliable solution. This value works on Android and on iOS.

回答7:

Simple prevent the default behavior of click, dblclick or touchend events will disable the zoom functionality.

If you have already a callback on one of this events just call a event.preventDefault().

回答8:

This will prevent double tap zoom on elements in 'body' this can be changed to any other selector

$('body').bind('touchstart', function preventZoom(e){
            var t2 = e.timeStamp;
            var t1 = $(this).data('lastTouch') || t2;
            var dt = t2 - t1;
            var fingers = e.originalEvent.touches.length;
            $(this).data('lastTouch', t2);
            if (!dt || dt > 500 || fingers > 1){
                return; // not double-tap
            }
            e.preventDefault(); // double tap - prevent the zoom
            // also synthesize click events we just swallowed up
            $(e.target).trigger('click');

});

But this also prevented my click event from triggering when clicked multiple times so i had to bind a another event to trigger the events on multiple clicks

$('.selector').bind('touchstart click', preventZoom(e) {    
    e.stopPropagation(); //stops propagation
    if(e.type == "touchstart") {
      // Handle touchstart event.
    } else if(e.type == "click") {
      // Handle click event.
    }
});

On touchstart i added the code to prevent the zoom and trigger a click.

$('.selector').bind('touchstart, click', function preventZoom(e){
            e.stopPropagation(); //stops propagation
            if(e.type == "touchstart") {
                // Handle touchstart event.
                var t2 = e.timeStamp;
                var t1 = $(this).data('lastTouch') || t2;
                var dt = t2 - t1;
                var fingers = e.originalEvent.touches.length;
                $(this).data('lastTouch', t2);


                if (!dt || dt > 500 || fingers > 1){
                    return; // not double-tap
                }

                e.preventDefault(); // double tap - prevent the zoom
                // also synthesize click events we just swallowed up
                $(e.target).trigger('click');

            } else if(e.type == "click") {
                // Handle click event.
               "Put your events for click and touchstart here"
            }

 });

回答9:

I assume that I do have a <div> input container area with text, sliders and buttons in it, and want to inhibit accidental double-taps in that <div>. The following does not inhibit zooming on the input area, and it does not relate to double-tap and zooming outside my <div> area. There are variations depending on the browser app.

I just tried it.

(1) For Safari on iOS, and Chrome on Android, and is the preferred method. Works except for Internet app on Samsung, where it disables double-taps not on the full <div>, but at least on elements that handle taps. It returns return false, with exception on text and range inputs.

$('selector of <div> input area').on('touchend',disabledoubletap);

function disabledoubletap(ev) {

    var preventok=$(ev.target).is('input[type=text],input[type=range]');

    if(preventok==false) return false; 
}

(2) Optionally for built-in Internet app on Android (5.1, Samsung), inhibits double-taps on the <div>, but inhibits zooming on the <div>:

$('selector of <div> input area').on('touchstart touchend',disabledoubletap);

(3) For Chrome on Android 5.1, disables double-tap at all, does not inhibit zooming, and does nothing about double-tap in the other browsers. The double-tap-inhibiting of the <meta name="viewport" ...> is irritating, because <meta name="viewport" ...> seems good practice.

<meta name="viewport" content="width=device-width, initial-scale=1, 
          maximum-scale=5, user-scalable=yes">

回答10:

I was havin trouble with this because I had to make a public touchscreen and none of those solutions worked for me, I used the css touch-events: none to completly take out all the touch events. Just leaving this here in case someone also has this problems, took me 2 hours to find this solution and it's only one line of css. https://developer.mozilla.org/en-US/docs/Web/CSS/touch-action