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jquery realizes louver effect

  • 2021-07-10 18:27:57
  • OfStack

Today, try to use jq to write the next picture shutter effect, that is, the mouse passes through that picture, that picture shows, and other pictures shrink ~

When I first saw the effect, I felt very complicated. I thought it was an animation written by the change of width, but later I thought carefully that if it was a change of width, the picture would definitely be distorted when it narrowed. Later, after learning, I found that the original principle was very simple:

The basic principle is that the pictures are absolutely positioned in the box, and then the whole box is positioned separately and divided equally, and the pictures will show a cascading effect (in this case, the position is controlled by left value); Then, through jq control, when the mouse passes through a certain picture, this picture is completely displayed (that is, the left value changes), and the left value of other pictures also changes accordingly.

It is difficult to understand the text description. First, the layout effect of html and css 


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
</head>
<body>
<style type="text/css">
div{
 width: 420px;
 height: 186px;
 border: 2px solid #ccc;
 overflow: hidden;
 position: relative;
 margin: 100px auto;
}
img{
 border: none;
 display: block;
 position: absolute;
 top: 0;
}
img:nth-of-type(1){
 left: 0;
}
img:nth-of-type(2){
 left: 84px;
}
img:nth-of-type(3){
 left: 168px;
}
img:nth-of-type(4){
 left: 252px;
}
img:nth-of-type(5){
 left: 336px;
}
</style>
<div class="box">
 <img src="http://tupian.enterdesk.com/2013/mxy/10/12/1/17.jpg">
 <img src="http://tupian.enterdesk.com/2013/mxy/07/0715/1/7.jpg">
 <img src="http://src.house.sina.com.cn/imp/imp/deal/5c/fa/e/afb00d1b581922fa567f9d65bfd_p1_mk1.jpg">
 <img src="http://www.wallcoo.com/nature/wild_field_01/wallpapers/1440x900/3787717_Wild_field_v1224236762.jpg">
 <img src="http://pic31.nipic.com/20130628/10700765_164502542117_2.jpg">
</div>
</body>
</html>

The layout is very simple, and then jq controls the change of relative position of each picture.

Starting position: The left value of 5 pictures has been written in css, which is to divide the width of the whole box equally;

When the mouse passes by: the picture that passes by is completely displayed, that is, it occupies a width of 280px (the width of the picture is 280px), and the remaining width is (box width-280px)/the number of remaining pictures. Determine the termination position of each picture according to the obtained value, left value;

I feel that what I said is very complicated. First, look at the animation effect when the mouse talked about a certain picture: 


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
</head>
<body>
<style type="text/css">
div{
 width: 420px;
 height: 186px;
 border: 2px solid #ccc;
 overflow: hidden;
 position: relative;
 margin: 100px auto;
}
img{
 border: none;
 display: block;
 position: absolute;
 top: 0;
}
img:nth-of-type(1){
 left: 0;
}
img:nth-of-type(2){
 left: 84px;
}
img:nth-of-type(3){
 left: 168px;
}
img:nth-of-type(4){
 left: 252px;
}
img:nth-of-type(5){
 left: 336px;
}
</style>
<div class="box">
 <img src="http://tupian.enterdesk.com/2013/mxy/10/12/1/17.jpg">
 <img src="http://tupian.enterdesk.com/2013/mxy/07/0715/1/7.jpg">
 <img src="http://src.house.sina.com.cn/imp/imp/deal/5c/fa/e/afb00d1b581922fa567f9d65bfd_p1_mk1.jpg">
 <img src="http://www.wallcoo.com/nature/wild_field_01/wallpapers/1440x900/3787717_Wild_field_v1224236762.jpg">
 <img src="http://pic31.nipic.com/20130628/10700765_164502542117_2.jpg">
</div>
<script type="text/javascript" src="https://code.jquery.com/jquery-1.11.3.js"></script>
<script type="text/javascript">
var lefts;
var idx;
$("img").each(function(){
 $(this).mouseenter(function(e) {
 idx = $(this).index();
 lefts = idx * 35;
 // Changes in the current picture 
 $(this).stop(true).animate({"left" : idx * 35}, 1000);
 });
})

The current picture can play happily, and the next focus is how the rest of the pictures move.

At this point, we can divide the remaining picture into left and right parts, and write the effect of the remaining parts with jq's ": lt ()" and ": gt ()" methods. There is a small pit here, which I have been circling for a long time, and finally it was reminded by others to get out.

Take the animation effect on the left side of the current picture as an example. At the beginning, I wrote this 


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
</head>
<body>
<style type="text/css">
div{
 width: 420px;
 height: 186px;
 border: 2px solid #ccc;
 overflow: hidden;
 position: relative;
 margin: 100px auto;
}
img{
 border: none;
 display: block;
 position: absolute;
 top: 0;
}
img:nth-of-type(1){
 left: 0;
}
img:nth-of-type(2){
 left: 84px;
}
img:nth-of-type(3){
 left: 168px;
}
img:nth-of-type(4){
 left: 252px;
}
img:nth-of-type(5){
 left: 336px;
}
</style>
<div class="box">
 <img src="http://tupian.enterdesk.com/2013/mxy/10/12/1/17.jpg">
 <img src="http://tupian.enterdesk.com/2013/mxy/07/0715/1/7.jpg">
 <img src="http://src.house.sina.com.cn/imp/imp/deal/5c/fa/e/afb00d1b581922fa567f9d65bfd_p1_mk1.jpg">
 <img src="http://www.wallcoo.com/nature/wild_field_01/wallpapers/1440x900/3787717_Wild_field_v1224236762.jpg">
 <img src="http://pic31.nipic.com/20130628/10700765_164502542117_2.jpg">
</div>
<script type="text/javascript" src="https://code.jquery.com/jquery-1.11.3.js"></script>
<script type="text/javascript">
var lefts;
var idx;
$("img").each(function(){
 $(this).mouseenter(function(e) {
 idx = $(this).index();
 lefts = idx * 35;
 // Changes in the current picture 
 $(this).stop(true).animate({"left" : idx * 35}, 1000);
  $( " img:lt( idx ) " ).each(function(){
 $(this).stop(true).animate({"left" : ($(this).index()) * 35}, 1000)
 })
 });
})

It seems that there is nothing wrong with witnessing miracles ~ ~ ~ Miracles ~ ~ ~ Traces ~ ~ ~ However, there is no miracle. The reason is that in the writing of $("img: lt (idx)"), idx inside is no longer a variable, so the current idx value cannot be obtained. We can define a variable outside and connect lt and variable idx with +.

Therefore, the changes are as follows: 


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
</head>
<body>
<style type="text/css">
div{
 width: 420px;
 height: 186px;
 border: 2px solid #ccc;
 overflow: hidden;
 position: relative;
 margin: 100px auto;
}
img{
 border: none;
 display: block;
 position: absolute;
 top: 0;
}
img:nth-of-type(1){
 left: 0;
}
img:nth-of-type(2){
 left: 84px;
}
img:nth-of-type(3){
 left: 168px;
}
img:nth-of-type(4){
 left: 252px;
}
img:nth-of-type(5){
 left: 336px;
}
</style>
<div class="box">
 <img src="http://tupian.enterdesk.com/2013/mxy/10/12/1/17.jpg">
 <img src="http://tupian.enterdesk.com/2013/mxy/07/0715/1/7.jpg">
 <img src="http://src.house.sina.com.cn/imp/imp/deal/5c/fa/e/afb00d1b581922fa567f9d65bfd_p1_mk1.jpg">
 <img src="http://www.wallcoo.com/nature/wild_field_01/wallpapers/1440x900/3787717_Wild_field_v1224236762.jpg">
 <img src="http://pic31.nipic.com/20130628/10700765_164502542117_2.jpg">
</div>
<script type="text/javascript" src="https://code.jquery.com/jquery-1.11.3.js"></script>
<script type="text/javascript">
var lefts;
var idx;
var imgL; 
$("img").each(function(){
 $(this).mouseenter(function(e) {
 idx = $(this).index();
  imgL = "img:lt(" + idx + ")"
 lefts = idx * 35;
 // Changes in the current picture 
 $(this).stop(true).animate({"left" : idx * 35}, 1000);
  $(imgL).each(function(){
 $(this).stop(true).animate({"left" : ($(this).index()) * 35}, 1000)
 })
 });
})

In this way, miracles appear ~ ~ the same reason, and the right side is the same method.

The final code is as follows: 


<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
</head>
<body>
<style type="text/css">
div{
 width: 420px;
 height: 186px;
 border: 2px solid #ccc;
 overflow: hidden;
 position: relative;
 margin: 100px auto;
}
img{
 width:280px;
 height:186px;
 border: none;
 display: block;
 position: absolute;
 top: 0;
}
img:nth-of-type(1){
 left: 0;
}
img:nth-of-type(2){
 left: 84px;
}
img:nth-of-type(3){
 left: 168px;
}
img:nth-of-type(4){
 left: 252px;
}
img:nth-of-type(5){
 left: 336px;
}
</style>
<div class="box">
 <img src="http://tupian.enterdesk.com/2013/mxy/10/12/1/17.jpg">
 <img src="http://tupian.enterdesk.com/2013/mxy/07/0715/1/7.jpg">
 <img src="http://src.house.sina.com.cn/imp/imp/deal/5c/fa/e/afb00d1b581922fa567f9d65bfd_p1_mk1.jpg">
 <img src="http://www.wallcoo.com/nature/wild_field_01/wallpapers/1440x900/3787717_Wild_field_v1224236762.jpg">
 <img src="http://pic31.nipic.com/20130628/10700765_164502542117_2.jpg">
</div>
<script type="text/javascript" src="https://code.jquery.com/jquery-1.11.3.js"></script>
<script type="text/javascript">
// The simplified method 
var lefts;
var idx;
var imgL; 
var imgR;
$("img").each(function(){
 $(this).mouseenter(function(e) {
 idx = $(this).index();
 imgL = "img:lt(" + idx + ")" // Gets all the pictures on the current left, if you use it directly  $("img:lt(idx)") , idx Will be treated as a string, and the corresponding value will not be obtained 
 imgR = "img:gt(" + idx + ")" // Gets all the pictures on the current right 
 lefts = idx * 35;
 // Changes in the current picture 
 $(this).stop(true).animate({"left" : idx * 35}, 1000);
 // Changes in the picture on the left 
 $(imgL).each(function(){
 $(this).stop(true).animate({"left" : ($(this).index()) * 35}, 1000)
 })
 // Changes in the picture on the right 
 $(imgR).each(function(){
 $(this).stop(true).animate({"left" : ($(this).index()+7) * 35}, 1000)
 })
 });
})
$("img").each(function(){
 $(this).mouseleave(function(){
 $("img").each(function(){
 $(this).stop(true).animate({"left" : ($(this).index())*84}, 1000);
 })
 });
})
</script>
</body>
</html>

The effect of moving the mouse out is to return to the initial state, so it is not described.

The method may not be the simplest method, and it may not be very detailed. I hope the great God will give me more advice and I will learn more ~ ~ ~

ps: I don't know how to add the pictures. Let's change them later. Welcome to join the front-end group of exchange learning 466039913

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