Cố định menu khi cuộn trang trong wordpress

     
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In this tutorial, we’ll learn how khổng lồ create a pattern seen on many websites these days: a fixed header which animates khổng lồ a less obtrusive state as we scroll down the page. We’ll start with the basic structure, then get things working using CSS & pure JavaScript. Before closing, we’ll briefly cover how we can optimize our code as well as discussing challenges present when applying this kind of pattern to touch devices.quý khách hàng sẽ xem: Cố định header lúc cuộn trang

To get an idea of what we’re going to lớn build, here’s the thử nghiệm (you may prefer fullscreen view):

HTML Markup

We’ll start this exercise with the following markup–a header, containing a & a couple of other nested elements:

Logo ☰ The nav element, which is part of the header, contains three elements; the biệu tượng công ty, the main menu, và a placeholder button lớn trigger a responsive sầu thực đơn (below 1061px). 

Note: If you cliông xã on this button, nothing much will happen. Creating the responsive sầu menu is beyond the scope of this tutorial.

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Initial CSS Styles

Now let’s have a look at some CSS styles lớn get things moving:

header position: fixed; top: 0; width: 100%; padding: 20px; box-sizing: border-box; background: #DD3543;nav display: flex; align-items: flex-end; justify-content: space-between; transition: align-items .2s;.hình ảnh font-size: 2rem; display: inline-block; padding: 20px 30px; background: #F35B66; color: #fff; margin: 50px 0 0 50px; transition: all .2s;ul display: flex; margin: 50px 50px 0 0; padding: 0; transition: margin .2s;li:not(:last-child) margin-right: 20px;li a display: block; padding: 10px 20px;.toggle-thực đơn display: none; font-size: 2rem; color: #fff; margin: 10px 10px 0 0; transition: margin .2s;main display: block; padding: 0 20px;Here’s a brief explanation of the most important rules here:

The header element is a fixed positioned element.We use flexbox khổng lồ layout the nav element.The logo has margin-top: 50px and margin-left: 50px. Additionally, we give it padding: 20px 30px.The main menu mirrors the hình ảnh sản phẩm, with margin-top: 50px and margin-right: 50px.The responsive sầu links button is hidden. It becomes visible when the viewport width is less than 1061px. Moreover, we set its top và right margins khổng lồ 10px.We add the transition property lớn the elements whose property values will change in the future. In this way, we achieve sầu a smooth transition effect between the initial state và the final state. 

With these rules in place, the header looks lượt thích this:


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Animating the Header

So far we’ve sầu built the basic structure of our header. It’s now time lớn discuss the next steps:

The main element should be positioned right underneath the header. Rethành viên that the header has positioned: fixed, and it’s therefore positioned on top of the main element. The header should be animated as we scroll down the page.

To solve sầu the first task, we add a padding-top property to lớn the main element. The value of this property should be equal to the header’s height. In our case, we haven’t specified a fixed height for our header, so we’ll use some JavaScript khổng lồ calculate it, & then add the corresponding padding to the main element. 

To solve the second task, we’ll vì the following:

Retrieve sầu the number of pixels that the document has already been scrolled vertically.If this number is greater than 150px, we assign the scroll class to the header.

JavaScript

Here’s the required JavaScript code–we begin by defining some variables, calculating the height of the header, then adding that value as padding-top to lớn the main element:

Now onto lớn the scrolling event:

function onScroll() window.addEventListener("scroll", callbackFunc); function callbackFunc() var y = window.pageYOffset; if (y > 150) h.classList.add("scroll"); else h.classList.remove("scroll"); Here we take advantage of the window’s pageYOffset property to calculate the number of pixels that our document has been scrolled vertically. chú ý that this property doesn’t work in older versions of IE (here.

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Then we use the classList property khổng lồ add & remove sầu the scroll class from our header. Not all browsers tư vấn this property however, so if you want to tư vấn any of these you may want to lớn look at the classList.js và classie.js polyfills. For this example, we could have used the className property khổng lồ manipulate our single class, but in a real-world scenario this might not the ikhuyến mãi solution (in case we have sầu multiple classes). 

To wrap things up, we call our functions in two different cases:

When the page loadsand as we reform size the browser window.

window.onload = function() setTopPadding(); onScroll();;window.onrekích thước = function() setTopPadding();;

CSS

As long as our scrolling exceeds the limit of 150px, a few additional CSS rules take place:

.scroll box-shadow: 0 7px 0 0 rgba(0, 0, 0, .1);.scroll .logo padding: 10px 20px; font-size: 1.5rem;.scroll nav align-items: center;.scroll .logo,.scroll ul,.scroll .toggle-menu margin: 0;Specifically, we make the following changes:

The aforementioned rules result in this new header layout:


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Going Responsive

As we’ve mentioned in a previous section, when the viewport width is less than 1061px, we hide the menu and show the responsive sầu link button (which doesn’t actually vì anything). Plus, we make a few other changes in the target elements.


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