Home > Developer > Web Develop

Native JS-Implemented Magnifier effect

Source: Internet
Author: User
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

This is my native JS write Magnifier effect, compared with a variety of framework technology, I like to use the native JS, here, want to talk with you about the native and framework technology understanding and personal preferences.

<! DOCTYPE html>
<title>js Magnifier Effect </title>
<meta http-equiv= "Content-type" content= "Text/html;charset=utf-8"/>
<style>
*{
margin:0px;
padding:0px;
Border:none;
List-style:none;
}
#box {
margin:80px Auto;
width:352px;
}
#box P
{
width:350px;
height:350px;
border:1px solid #ddd;
margin-bottom:5px;
}
#box p img
{
width:350px;
height:350px;
}
#box H1
{
width:352px;
height:54px;
Overflow:hidden;
position:relative;
}
#box H1 Div
{
width:310px;
height:54px;
margin:0px Auto;
position:relative;
}
#box H1 Div ul
{
Position:absolute;
left:0px;
top:0px;
}
#box H1 ul Li
{
width:62px;
Float:left;
}
#box H1 ul li img
{
width:50px;
height:50px;
padding:1px;
border:1px solid #CECFCE;
}
#box H1 img.hoveredthumb{
border:2px solid #e4393c;
padding:0;
}
/* Medium-sized picture display area */
p#medimgbox{
position:relative;
}
#jing {
Position:absolute;
left:0;
top:0;
width:175px;
height:175px;
border-radius:50%;
Background: #ffd;
opacity:0.7;
Display:none;
}
/* Hangs at the top of the picture/jing dedicated to receiving mouse movement events
A completely transparent layer */
#medImgBox #mian {
Display:block;
Position:absolute;
width:100%;
height:100%;
top:0;
left:0;
Cursor:move;
opacity:0;
}

/**
Large Map Display Area
**/
#largeImgBox {
Position:absolute;
width:175px;
height:175px;
border-radius:50%;
border:1px solid #faa;
top:0px;
left:352px;
Overflow:hidden;
Display:none;
}
#largeImg {
Display:none;
Position:absolute;
}
</style>
<body >
<div id= "box" >
<p id= "Medimgbox" >

<span id= "Jing" ></span>
<span id= "Mian" ></span>
<span id= "Largeimgbox" >

</span>
</p>
<div>
<ul id= "List" >
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
</div>
</div>


<script>
var imglist = Document.queryselectorall (' #box ul li img ');
for (var i=0; i var img = imglist[i];
Img.onmouseover = changethumbimg;
}
Function changethumbimg () {
var previoushovered = Document.queryselector ('. Hoveredthumb ');
if (previoushovered==null) {
This.classname = ' hoveredthumb ';
Changemediumimg (THIS.SRC);//Modify the SRC
}else if (previoushovered!=this) {
Previoushovered.removeattribute (' class ');
This.classname = ' hoveredthumb ';
Changemediumimg (THIS.SRC);//Modify the medium image's SRC
}
}
function changemediumimg (thumbsrc) {
var dotindex = Thumbsrc.lastindexof ('. ');
var prefix = thumbsrc.substring (0, Dotindex);
var suffix = thumbsrc.substring (dotindex);
var mediumsrc = prefix + '-m ' +suffix;
document.getElementById (' mediumimg '). src = mediumsrc;
}

/**
Add a mouse move event for Magnifier Jing
**/
Document.queryselector (' #mian '). onmousemove =
function (event) {
var x = offset of the event.offsetx;//event relative to the event source
var y = event.offsety;
var jing = document.getElementById (' Jing ');
var w = jing.offsetwidth; Jing Width and height
var h = jing.offsetheight;
var left = X<w/2? 0: (X-W/2);
var top = Y

if (x> (W*2-W/2)) {
left = w*2-w;
}
if (y> (H*2-H/2)) {
top = h*2-h;
}

Jing.style.left = left+ ' px ';
Jing.style.top = top+ ' px ';

//Modify the position of the large image/
var largeimg = document.getElementById (' largeimg ');
LargeImg.style.left = (-left*largeimg.width/350) + ' px ';
LargeImg.style.top = (-top*largeimg.height/350) + ' px ';
}
Document.queryselector (' #mian '). onmouseover = function () {
//Display Jing
var jing = document.getElementById (' Jing ');
Jing.style.display = ' block ';
var largeimgbox = document.getElementById (' Largeimgbox ');
LargeImgBox.style.display = ' block ';

Gets the src of the large image currently being displayed
var src = document.queryselector (' #mediumImg '). Src;
var dotindex = Src.lastindexof ('. ');
var prefix = src.substring (0, dotIndex-2);
var suffix = src.substring (dotindex);
src = prefix + '-l ' + suffix;
var largeimg = document.getElementById (' largeimg ');
LARGEIMG.SRC = src;
largeimg.style.display= ' block ';
}
Document.queryselector (' #mian '). onmouseout =
function () {
Remove Jing
var jing = document.getElementById (' Jing ');
Jing.style.display = ' None ';
Remove large image display area
document.getElementById (' Largeimgbox '). style.display = ' None ';
}
</script>
</body>

Native JS-Implemented Magnifier effect

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
newspaper magnifier android magnifier tablet magnifier magnifier settings gameboy magnifier android magnifier android screen magnifier app

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More