Flex layout implements the layout of NetEase Cloud player interface

This article introduces you to the flex layout to implement the layout of the NetEase Cloud player interface. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Today we will go into the details of the project and talk about the hurdles that every graphics cutter cannot get around. It is also a regular task that jser must face - "NetEase Cloud Music Highly Reusable Responsive Carousel Graphics" The realization of the carousel chart is as important as the preparation work for you to go to your girlfriend’s house for the first time and cannot be bypassed. Unfortunately, most people write carousel pictures as if they are meeting parents for the first time and have little experience.

Many people want to write a set of carousels themselves, and then continue to improve them in their future work, and finally form their own plug-in library. Unfortunately, most people who have this idea only find out when they take action. To realize this is even harder than fulfilling the promise of "buying an apartment when you get married". In the end, I had no choice but to become a porter of plug-ins due to project pressure and my own skill level.

But there are three problems with the plug-in porter. First of all, this thing is of no use to a person's technical growth. Secondly, and this is also the key point, the plug-in does not fully meet the project requirements, and I am not capable of secondary development. When encountering strange things The bug can only resign itself to its fate and continue on the slow journey of finding a more suitable plug-in. Finally, some plugins are heavy and bloated, but all you need is the most basic carousel functionality. Would you make dumplings just to have a plate of vinegar? I don't think so. Then why do you use hundreds of K or even M plug-ins in the project just to use a carousel?

Many people may say that it’s because they don’t know how to write. Well, today we will implement one. You will find that the world of js is so simple and beautiful. With the effort of finding plug-ins, you can develop 8 A plug-in.

Look up, everyone knows what a carousel picture is, take a closer look at what you have to do in the first step, at least say I’m dragging it. Something must be able to move, even if it is a red square. Here we have to talk about dragging. What is changed by dragging is nothing more than the left and top values ​​(only aliens change the right and bottom values. We earthlings generally use left and top. Don’t ask me why). First let him move in one direction. Get moving.

nbsp;html>


    <meta>
    <meta>
    <meta>
    <title>Document</title>
    <style>
        #p1 {
            width: 100px;
            height: 100px;
            position: absolute;
            left: 50px;
            top: 50px;
            background: red;
        }
    </style>
    <script>
        document.addEventListener("DOMContentLoaded", function () {
            var op = document.getElementById(&#39;p1&#39;);

            var disX = 0;
            op.addEventListener("touchstart", function (e) {
                var startPoint = e.changedTouches[0].pageX;
                var startLeft = op.offsetLeft;
                disX = startPoint - startLeft;
            });

            op.addEventListener("touchmove", doMove,false);
            function doMove(e) {
                var currPoint = e.changedTouches[0].pageX;
                var newLeft  = currPoint - disX;
                op.style.left = newLeft +&#39;px&#39;;
            }
            function doUp(e) {
                var currPoint = e.changedTouches[0].pageX;
                var newLeft  = currPoint - disX;
                op.style.left = newLeft +&#39;px&#39;;
                op.removeEventListener("touchmove", doUp,false);
                op.removeEventListener("touchend", doUp,false);
            }
            op.addEventListener("touchend", doUp,false);
        }, false);
    </script>


    <p></p>

Look carefully, it’s just using mobile events, you can understand it in minutes. The problem is that many students will say, teacher, I don’t understand here, what is this,

 var currPoint = e.changedTouches[0].pageX;
 var newLeft  = currPoint - disX;
 op.style.left = newLeft +'px';

What is this?

var currPoint = e.changedTouches[0].pageX;
var newLeft  = currPoint - disX;
op.style.left = newLeft +'px';
op.addEventListener("touchmove", doUp,false);
op.addEventListener("touchend", doUp,false);

In fact, these are the core content. Simply put, it is a picture, a very simple picture,

You can understand it at a glance.

In fact, it is to calculate the distance of the blue line. As long as the blue line is correct, the position will not be wrong. If you really can’t understand it, it’s okay. You can There is nothing wrong with memorizing it as a formula. With these basic knowledge, it will be easy to handle, set up a shelf,

nbsp;html>



    <meta>
    <meta>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        li {
            list-style: none;
        }

        .swiper-container {
            width: 320px;
            height: 130px;
            position: relative;
            margin: 20px auto;
            overflow: hidden;
        }

        .swiper-container .swiper-wrapper {
            width: 2240px;
            height: 130px;
            position: absolute;
            left: 0px;
        }

        .swiper-container .swiper-wrapper img {
            width: 320px;
            height: 130px;
            float: left;
            display: block;
        }

        .swiper-container ul {
            width: 35px;
            height: 4px;
            position: absolute;
            bottom: 10px;
            left: 50%;
            margin-left: -15px;
        }

        .swiper-container ul li {
            width: 4px;
            height: 4px;
            border-radius: 2px;
            border: 0.25px solid #fff;
            margin-left: 2.5px;
            background: #666;
            float: left;
            cursor: pointer;
        }

        .swiper-container ul .active {
            background: #fff;
        }

        .swiper-container ul li:hover {
            background: #fff;
        }
    </style>



    <p>
        </p><p>
            <img  alt="Flex layout implements the layout of NetEase Cloud player interface" >
            <img  alt="Flex layout implements the layout of NetEase Cloud player interface" >
            <img  alt="Flex layout implements the layout of NetEase Cloud player interface" >
            <img  alt="Flex layout implements the layout of NetEase Cloud player interface" >
            <img  alt="Flex layout implements the layout of NetEase Cloud player interface" >
            <img  alt="Flex layout implements the layout of NetEase Cloud player interface" >
            <img  alt="Flex layout implements the layout of NetEase Cloud player interface" >
        </p>
        

            
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         <script> document.addEventListener("DOMContentLoaded", function () { var oSWiperContainer = document.querySelector(".swiper-container"); var oSWiperWrapper = document.querySelector(".swiper-container .swiper-wrapper"); var aImg = document.querySelectorAll(".swiper-container .swiper-wrapper img") var aLi = document.querySelectorAll(".swiper-container ul li"); oSWiperContainer.addEventListener("touchstart", function (e) { var disX = 0; var startPoint = e.changedTouches[0].pageX; var startLeft = oSWiperWrapper.getBoundingClientRect().left; disX = startPoint - startLeft; oSWiperContainer.addEventListener("touchmove", doMove, false); oSWiperContainer.addEventListener("touchend", doUp, false); function doMove(e) { var currPoint = e.changedTouches[0].pageX; var newLeft = currPoint - disX; oSWiperWrapper.style.left = newLeft + &#39;px&#39;; } function doUp(e) { oSWiperContainer.removeEventListener("touchmove", doUp, false); oSWiperContainer.removeEventListener("touchend", doUp, false); } }, false); }, false); </script> At least now you can drag and drop. Let’s keep it simple here. You don’t even need to consider the vertical direction. Carousel is simpler than dragging. Just think about it. Horizontal direction,

The problem is that after letting go, each item of the carousel chart does not go to the correct position. What is the correct position? In fact, the value of left every time it is changed will be a carousel chart. width, picture above.

Don’t worry about anything else. The red box is the width of the mobile phone screen. It actually moves one grid each time. Then I only need to set an iNow value and record how many grids to move. As long as the iNow is correct, everything will be fine. I can just do it.

nbsp;html>



    <meta>
    <meta>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        li {
            list-style: none;
        }

        .swiper-container {
            width: 320px;
            height: 130px;
            position: relative;
            margin: 20px auto;
            overflow: hidden;
        }

        .swiper-container .swiper-wrapper {
            width: 2240px;
            height: 130px;
            position: absolute;
            left: 0px;
            transition: .3s all ease;

        }

        .swiper-container .swiper-wrapper img {
            width: 320px;
            height: 130px;
            float: left;
            display: block;
        }

        .swiper-container ul {
            width: 35px;
            height: 4px;
            position: absolute;
            bottom: 10px;
            left: 50%;
            margin-left: -15px;
        }

        .swiper-container ul li {
            width: 4px;
            height: 4px;
            border-radius: 2px;
            border: 0.25px solid #fff;
            margin-left: 2.5px;
            background: #666;
            float: left;
            cursor: pointer;
        }

        .swiper-container ul .active {
            background: #fff;
        }

        .swiper-container ul li:hover {
            background: #fff;
        }
    </style>



    <p>
        </p><p>
            <img  alt="Flex layout implements the layout of NetEase Cloud player interface" >
            <img  alt="Flex layout implements the layout of NetEase Cloud player interface" >
            <img  alt="Flex layout implements the layout of NetEase Cloud player interface" >
            <img  alt="Flex layout implements the layout of NetEase Cloud player interface" >
        </p>
        

            
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         <script> document.addEventListener("DOMContentLoaded", function () { var oSWiperContainer = document.querySelector(".swiper-container"); var oSWiperWrapper = document.querySelector(".swiper-container .swiper-wrapper"); var aImg = document.querySelectorAll(".swiper-container .swiper-wrapper img") var aLi = document.querySelectorAll(".swiper-container ul li"); var iNow = 0; var oW = aImg[0].offsetWidth; oSWiperContainer.addEventListener("touchstart", function (e) { var disX = 0; var startPoint = e.changedTouches[0].pageX; var startLeft = oSWiperWrapper.getBoundingClientRect().left; disX = startPoint - startLeft; oSWiperContainer.addEventListener("touchmove", doMove, false); oSWiperContainer.addEventListener("touchend", doUp, false); function doMove(e) { var currPoint = e.changedTouches[0].pageX; var newLeft = currPoint - disX; oSWiperWrapper.style.left = newLeft+&#39;px&#39;; } function doUp(e) { var endPoint = e.changedTouches[0].pageX; if(endPoint-startPoint>50){ iNow--; if(iNow==-1){ iNow = 0; } oSWiperWrapper.style.left = -iNow*oW+&#39;px&#39;; } if(endPoint-startPoint<-50){ iNow++; if(iNow==aImg.length){ iNow = aImg.length -1; } oSWiperWrapper.style.left = -iNow*oW+&#39;px&#39;; } oSWiperContainer.removeEventListener("touchmove", doMove, false); oSWiperContainer.removeEventListener("touchend", doUp, false); } }, false); }, false); </script> To emphasize, getBoundingClientRect(), why didn’t I use offsetLeft here? Because in actual projects, it is impossible for the outer layer of the carousel to be covered with nothing, or if there is margin and padding, the distance of the carousel will be wrong. Using offsetLeft is not practical for the project, and it is okay for demonstrations. , the actual project would be useless if written like that.

Finally, I will talk about an infinite carousel, which actually counts numbers!

) The so-called infinite carousel The principle of broadcasting is that when iNow is equal to the 0 on the far right, pull it back to the red box position. On the left is when iNow is equal to 4 on the far left, iNow is equal to 6.

Many people have the source The code ignores the basic learning and is used directly. It is no different from directly looking for the plug-in, so just treat this as a small exercise.

Four exercises:

1. Implement corresponding adaptation to multiple screens

2. Implement wireless carousel

3. Implement if the sliding distance does not exceed 50px will not broadcast the next one

4. Implement automatic rotation with timer!

Here I put the code on the left side of the above four practice solutions as a reminder, and everyone should try their best to learn to implement it.

Recommended related articles:

Detailed explanation of flex layout

##How to use flex layout to distribute columns

CSS3 flex layout application introduction_html/css_WEB-ITnose

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