Question

我正在玩Stellar.js并使用此处的演示： http://webdesign.tutsplus.com/tutorials/complete-websites/create-a-parallax-scrolling-website-using-stellar-js/

我遇到了与演示页面相同的问题，也就是说，当页面首次加载时，导航（幻灯片1）处于非活动状态。它只有在你开始向下滚动时才会变为活动状态，然后当你返回到幻灯片1时，它会保持活动状态。

这是FireFox和IE8中的问题（没有IE9可以测试）。

我确定它是一个航点问题，而不是在页面加载时激活。如何修复它以使导航中的“幻灯片1”进入活动类状态？

以下是演示中的JS代码：

jQuery(document).ready(function ($) {


//initialise Stellar.js
$(window).stellar(
    {
    // Set scrolling to be in either one or both directions
    horizontalScrolling: true,
    verticalScrolling: true,    
    // Refreshes parallax content on window load and resize
    responsive: true,   



    }
    );

//Cache some variables
var links = $('.navigation').find('li');
slide = $('.slide');
button = $('.button');
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') {
        $('.navigation li[data-slide="' + dataslide + '"]').addClass('active').prev().removeClass('active');
    }
    // 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 {
        $('.navigation li[data-slide="' + dataslide + '"]').addClass('active').next().removeClass('active');
    }

});


//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) {
        $('.navigation li[data-slide="1"]').addClass('active');
        $('.navigation li[data-slide="2"]').removeClass('active');
    }
});

//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: $('.slide[data-slide="' + dataslide + '"]').offset().top
    }, 2000, '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);

});

}）;

任何帮助都非常感激。

Answer 1

您应该查看jQuery Waypoints plugin可用的功能。

首先是尝试稍微设置航点插件的偏移设置（http://imakewebthings.com/jquery-waypoints/#doc-disable）。这将使航点触发在页面的不同位置，这样即使您位于屏幕顶部，第一个航点也会触发。

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

dataslide = $(this).attr('data-slide');

if (direction === 'down') {
    $('.navigation li[data-slide="' + dataslide + '"]').addClass('active').prev().removeClass('active');
}    
else {
    $('.navigation li[data-slide="' + dataslide + '"]').addClass('active').next().removeClass('active');
}
}, { offset:50 }); // The waypoint is triggered when the element is 50px from the top of the viewport.

或者您可以将“活动”CSS类添加到第一个元素，然后在滚动时更改。

希望能帮到你。

Answer 2

您也可以在html中添加该类，因为当您从第一个元素滚动时脚本会删除该类。

Parallax / Steller.js和Jquery Waypoints

2 个答案: