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我正在使用以下示例创建具有视差的网站：http ://webdesigntutsplus.s3.amazonaws.com/tuts/338_parallax/src/index.html

一切看起来都不错，但是左侧的导航有烦人的错误，当我使用从上到下的导航步骤时，一切看起来都不错，但是当使用导航从下到上返回时，它无法检测到当前幻灯片。有谁知道如何解决这个问题？

jQuery脚本：

$(window).stellar();

//Cache some variables
var links = $('#menu').find('li');
slide = $('.section'); 
mywindow = $(window); 
htmlbody = $('html,body');


//Setup waypoints plugin
slide.waypoint(function (event, direction) {

    //cache the variable of the data-slide attribute associated with each slide
    dataslide = $(this).attr('data-slide');

    //If the user scrolls up change the navigation link that has the same data-slide attribute as the slide to active and 
    //remove the active class from the previous navigation link 
    if (direction === 'down') {
        $('#menu li[data-slide="' + dataslide + '"]').addClass('current').prev().removeClass('current');
    }
    // else If the user scrolls down change the navigation link that has the same data-slide attribute as the slide to active and 
    //remove the active class from the next navigation link

    else {
        $('#menu ul li[data-slide="' + dataslide + '"]').addClass('current').next().removeClass('current');
    }



});

//waypoints doesnt detect the first slide when user scrolls back up to the top so we add this little bit of code, that removes the class 
//from navigation link slide 2 and adds it to navigation link slide 1. 
mywindow.scroll(function () {




    if (mywindow.scrollTop() == 0) {
        $('#menu li[data-slide="1"]').addClass('current');
        $('#menu li[data-slide="2"]').removeClass('current');
    }
});

//Create a function that will be passed a slide number and then will scroll to that slide using jquerys animate. The Jquery
//easing plugin is also used, so we passed in the easing method of 'easeInOutQuint' which is available throught the plugin.
function goToByScroll(dataslide) {
    htmlbody.animate({
        scrollTop: $('.section[data-slide="' + dataslide + '"]').offset().top-1
    }, 1000, 'easeInOutQuint');
}



//When the user clicks on the navigation links, get the data-slide attribute value of the link and pass that variable to the goToByScroll function
links.click(function (e) {
    e.preventDefault();
    dataslide = $(this).attr('data-slide');
    goToByScroll(dataslide);
});

//When the user clicks on the button, get the get the data-slide attribute value of the button and pass that variable to the goToByScroll function
/*button.click(function (e) {
    e.preventDefault();
    dataslide = $(this).attr('data-slide');
    goToByScroll(dataslide);

});*/

所以如果我在那里添加

function goToByScroll(dataslide) { htmlbody.animate({ scrollTop: $('.section[data-slide="' + dataslide + '"]').offset().top-1 }, 1000, 'easeInOutQuint'); }

.offset().top-1然后导航当前菜单在从上到下滚动时显示错误值，如果+1则从下到上错误，如果我只离开.offset().top它显示当前页面从下到上错误。

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1 回答 1

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I got around this same problem by setting a variable 'currentslide', then using this to determine whether the page is scrolling up or down, and offsetting the scroll amount accordingly. So:

//Cache some variables
var links = $('.navigation').find('li');
slide = $('.slide');
button = $('.button');
mywindow = $(window);
htmlbody = $('html,body');
currentslide=1; // new variable to determine current position

then lower down:

//Create a function that will be passed a slide number and then will scroll to that slide using jquerys animate. The Jquery
//easing plugin is also used, so we passed in the easing method of 'easeInOutQuint' which is available throught the plugin.
function goToByScroll(dataslide) {

    if (currentslide<dataslide){
        htmlbody.animate({
            scrollTop: $('.slide[data-slide="' + dataslide + '"]').offset().top
        }, 2000, 'easeInOutQuint');
        currentslide=dataslide;
    } else {
        htmlbody.animate({
            scrollTop: $('.slide[data-slide="' + dataslide + '"]').offset().top -10
        }, 2000, 'easeInOutQuint');
        currentslide=dataslide;
    }

}

You may need to adjust the value of -10 depending on your site.

于 2013-07-31T09:59:11.937 回答