如何突出显示滚动菜单上的活动菜单项并单击? [英] How to highlighting active menu item on scroll and click?

问题描述

我要向滚动菜单上的当前菜单项添加类active，然后单击.这是一个包含不同部分的单个(长)页面.单击一个项目时，活动状态应切换到当前状态.

I want to add a class active to the current menu item on scroll and click. It’s a single (long) page with different sections. When click on an item, the active state should switch to the current one.

我想出了以下代码，但现在不知道如何集成以上代码:

I came up with the following code, but doesn’t now how I can integrate the above:

// Click event
    $('#primary-navwrapper li a[href^="#"]').click(function(event) {

        // Prevent from default action to intitiate
        event.preventDefault();

        // The id of the section we want to go to
        var anchorId = $(this).attr('href');

        // Our scroll target : the top position of the section that has the id referenced by our href
        var target = $(anchorId).offset().top - offset;
        console.log(target);

        $('html, body').stop().animate({ scrollTop: target }, 500, function () {
            window.location.hash = anchorId;
        });

        return false;
    });

推荐答案

使用jQuery很容易在click上添加active类.您只需要点击处理程序中的这段代码

To add active class on click is simple using jQuery. You just need this code in the click handler

//remove active from all anchor and add it to the clicked anchor
        $('#primary-navwrapper li a[href^="#"]').removeClass("active")
        $(this).addClass('active');

对于滚动部分，您需要监视滚动条的位置并将其与每个页面偏移量进行比较

And for the scroll part you need to monitor the position of the scroll bar and compare it with every page offset like so

//check the pages when scroll event occurs
$(window).scroll(function(){
    // Get the current vertical position of the scroll bar
    position = $(this).scrollTop();
    $('#primary-navwrapper li a[href^="#"]').each(function(){
          var anchorId = $(this).attr('href'); 
           var target = $(anchorId).offset().top - offset;
           // check if the document has crossed the page
        console.log(position,target);
        if(position>=target){
             //remove active from all anchor and add it to the clicked anchor
            $('#primary-navwrapper li a[href^="#"]').removeClass("active")
            $(this).addClass('active'); 
        }
    })

这是一个演示 http://jsfiddle.net/k5afwfva/

这篇关于如何突出显示滚动菜单上的活动菜单项并单击?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！