添加向左/向右滑动到网页，但使用默认向上/向下滑动

Question

我正在使用 padilicious 来检测将在 iOS 和桌面上查看的网页的滑动手势。在我的网站的上一页和下一页向左/向右滑动非常有用。但是，向上/向下滑动时，它似乎覆盖了 iPhone/iPad 中的默认行为。我想要一个向上/向下滑动来滚动页面，当我没有 padilicious 运行时它会这样做。只是让代码忽略向上/向下滑动似乎不起作用。

我一直在做的一段精彩的代码

function processingRoutine() {
    var swipedElement = document.getElementById(triggerElementID);
    if ( swipeDirection == 'left' ) {
        document.location = document.getElementById('nextPage').href;
    } else if ( swipeDirection == 'right' ) {
        document.location = document.getElementById('prevPage').href;
    } else if ( swipeDirection == 'up' ) {
        return;
    } else if ( swipeDirection == 'down' ) {
        return;
    }


}

Answer 1

从所有函数中删除event.preventDefault();。在函数processingRoutine() {} 中添加event.preventDefault(); 以获得所需的内容。

function processingRoutine() {
    var swipedElement = document.getElementById(triggerElementID);
    if ( swipeDirection == 'left' ) {
        // REPLACE WITH YOUR ROUTINES
        //swipedElement.style.backgroundColor = 'orange';
        event.preventDefault();
    } else if ( swipeDirection == 'right' ) {
        // REPLACE WITH YOUR ROUTINES
        //swipedElement.style.backgroundColor = 'green';
        event.preventDefault();
    } else if ( swipeDirection == 'up' ) {
        // REPLACE WITH YOUR ROUTINES
        //swipedElement.style.backgroundColor = 'maroon';
    } else if ( swipeDirection == 'down' ) {
        // REPLACE WITH YOUR ROUTINES
        //swipedElement.style.backgroundColor = 'purple';
    }
}

Answer 2

有一个 jquery 库，可以完成这项工作（不提供向上/向下方法）：http://plugins.jquery.com/project/Touchwipe-iPhone-iPad-wipe-gesture

Answer 3

我不熟悉 padilicious，但请检查 ontouchmove="BlockMove(event);" 是否设置在任何地方，这会阻止页面像您描述的那样滚动，我不确定您如何让它保持垂直滚动但水平滑动。

编辑：从那以后，我发现了一个非常有用的概述，用于制作“原生”感觉的 iOS 网络应用程序，它可能不是您想要的，但可以为您提供另一种途径解决您的问题的方法。看看吧：http://matt.might.net/articles/how-to-native-iphone-ipad-apps-in-javascript/

Answer 4

Padilicious 似乎在所有情况下都防止默认。在所有情况下查看对 event.preventDefault() 的调用。

function touchStart(event,passedName) {
  // disable the standard ability to select the touched object
  event.preventDefault();

您必须更改 start、stop、... 处理程序，以便在 up 和 down 情况下不调用 preventDefault()。

Answer 5

我改变了脚本，这个工作：

    // TOUCH-EVENTS SINGLE-FINGER SWIPE-SENSING JAVASCRIPT
// Courtesy of PADILICIOUS.COM and MACOSXAUTOMATION.COM

// this script can be used with one or more page elements to perform actions based on them being swiped with a single finger

var triggerElementID = null; // this variable is used to identity the triggering element
var fingerCount = 0;
var startX = 0;
var startY = 0;
var curX = 0;
var curY = 0;
var deltaX = 0;
var deltaY = 0;
var horzDiff = 0;
var vertDiff = 0;
var minLength = 72; // the shortest distance the user may swipe
var swipeLength = 0;
var swipeAngle = null;
var swipeDirection = null;

// The 4 Touch Event Handlers

// NOTE: the touchStart handler should also receive the ID of the triggering element
// make sure its ID is passed in the event call placed in the element declaration, like:
// <div id="picture-frame" ontouchstart="touchStart(event,'picture-frame');"  ontouchend="touchEnd(event);" ontouchmove="touchMove(event);" ontouchcancel="touchCancel(event);">

function touchStart(event,passedName) {
    // disable the standard ability to select the touched object
    //event.preventDefault();
    // get the total number of fingers touching the screen
    fingerCount = event.touches.length;
    // since we're looking for a swipe (single finger) and not a gesture (multiple fingers),
    // check that only one finger was used
    if ( fingerCount == 1 ) {
        // get the coordinates of the touch
        startX = event.touches[0].pageX;
        startY = event.touches[0].pageY;
        // store the triggering element ID
        triggerElementID = passedName;
    } else {
        // more than one finger touched so cancel
        touchCancel(event);
    }
}

function touchMove(event) {
    //event.preventDefault();
    if ( event.touches.length == 1 ) {
        curX = event.touches[0].pageX;
        curY = event.touches[0].pageY;
    } else {
        touchCancel(event);
    }
}

function touchEnd(event) {
    //event.preventDefault();
    // check to see if more than one finger was used and that there is an ending coordinate
    if ( fingerCount == 1 && curX != 0 ) {
        // use the Distance Formula to determine the length of the swipe
        swipeLength = Math.round(Math.sqrt(Math.pow(curX - startX,2) + Math.pow(curY - startY,2)));
        // if the user swiped more than the minimum length, perform the appropriate action
        if ( swipeLength >= minLength ) {
            caluculateAngle();
            determineSwipeDirection();
            processingRoutine();
            touchCancel(event); // reset the variables
        } else {
            touchCancel(event);
        }   
    } else {
        touchCancel(event);
    }
}

function touchCancel(event) {
    // reset the variables back to default values
    fingerCount = 0;
    startX = 0;
    startY = 0;
    curX = 0;
    curY = 0;
    deltaX = 0;
    deltaY = 0;
    horzDiff = 0;
    vertDiff = 0;
    swipeLength = 0;
    swipeAngle = null;
    swipeDirection = null;
    triggerElementID = null;
}

function caluculateAngle() {
    var X = startX-curX;
    var Y = curY-startY;
    var Z = Math.round(Math.sqrt(Math.pow(X,2)+Math.pow(Y,2))); //the distance - rounded - in pixels
    var r = Math.atan2(Y,X); //angle in radians (Cartesian system)
    swipeAngle = Math.round(r*180/Math.PI); //angle in degrees
    if ( swipeAngle < 0 ) { swipeAngle =  360 - Math.abs(swipeAngle); }
}

function determineSwipeDirection() {
    if ( (swipeAngle <= 45) && (swipeAngle >= 0) ) {
        swipeDirection = 'left';
    } else if ( (swipeAngle <= 360) && (swipeAngle >= 315) ) {
        swipeDirection = 'left';
    } else if ( (swipeAngle >= 135) && (swipeAngle <= 225) ) {
        swipeDirection = 'right';
    }

    /* else if ( (swipeAngle > 45) && (swipeAngle < 135) ) {
        swipeDirection = 'down';
    } else {
        swipeDirection = 'up';
    }*/
}

function processingRoutine() {
    var swipedElement = document.getElementById(triggerElementID);
    if ( swipeDirection == 'left' ) {
        // REPLACE WITH YOUR ROUTINES
        event.preventDefault();
        swipedElement.style.backgroundColor = 'orange';
    } else if ( swipeDirection == 'right' ) {
        // REPLACE WITH YOUR ROUTINES
        event.preventDefault();
        swipedElement.style.backgroundColor = 'green';
    } 

    /*else if ( swipeDirection == 'up' ) {
        // REPLACE WITH YOUR ROUTINES
        swipedElement.style.backgroundColor = 'maroon';
    } else if ( swipeDirection == 'down' ) {
        // REPLACE WITH YOUR ROUTINES
        swipedElement.style.backgroundColor = 'purple';
    }*/
}