How to Detect Finger Swipe Direction on Mobile Web Pages with JavaScript (iPhone/Android Compatibility)?

Detecting Finger Swipes on Mobile Web Pages

In today's mobile-centric world, it's crucial to provide intuitive and responsive web experiences on all devices. Users expect smooth navigation and interaction on both iPhones and Android phones. One common gesture that's essential for mobile navigation is finger swiping.

Problem: How do you accurately detect a user's finger swipe direction on a web page using JavaScript, ensuring compatibility between iPhone and Android devices?

Solution: Fortunately, modern browsers provide JavaScript APIs that allow developers to track touch events. Here's a simple Vanilla JS code snippet that you can incorporate into your project:

<code class="javascript">document.addEventListener('touchstart', handleTouchStart, false);        
document.addEventListener('touchmove', handleTouchMove, false);

var xDown = null;                                                        
var yDown = null;

function getTouches(evt) {
  return evt.touches ||             // browser API
         evt.originalEvent.touches; // jQuery
}                                                     
                                                                         
function handleTouchStart(evt) {
    const firstTouch = getTouches(evt)[0];                                      
    xDown = firstTouch.clientX;                                      
    yDown = firstTouch.clientY;                                      
};                                                
                                                                         
function handleTouchMove(evt) {
    if ( ! xDown || ! yDown ) {
        return;
    }

    var xUp = evt.touches[0].clientX;                                    
    var yUp = evt.touches[0].clientY;

    var xDiff = xDown - xUp;
    var yDiff = yDown - yUp;
                                                                         
    if ( Math.abs( xDiff ) > Math.abs( yDiff ) ) {/*most significant*/
        if ( xDiff > 0 ) {
            /* right swipe */ 
        } else {
            /* left swipe */
        }                       
    } else {
        if ( yDiff > 0 ) {
            /* down swipe */ 
        } else { 
            /* up swipe */
        }                                                                 
    }
    /* reset values */
    xDown = null;
    yDown = null;                                             
};</code>

Testing: This code snippet has been tested and confirmed to work on Android devices. Implement it into your project to enhance the user experience for mobile users on both iPhone and Android phones.

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