javascript:100% native JS implementation of the left and right switch Carousel diagram (no delay loading)

Last Update:2017-02-05 Source: Internet

Author: User

Tags object object setinterval

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

<!--
Description: this. html file must have:
(1) The Json,json folder must have the file Data.txt, the contents of the file Data.txt are:
   [{"Imgsrc": "Img/banner1.jpg"},
    {"IMGSRC": "Img/banner2.jpg"},
    {"IMGSRC": "Img/banner3.jpg"},
    {"IMGSRC": "Img/banner4.jpg"}]
(2) The following images must be in the Img,img folder of the sibling folder: Banner1.jpg;banner2.jpg;banner3.jpg;banner4.jpg;
-

<! DOCTYPE html>
<meta charset= "UTF-8" >
<title></title>
<style>
*{
margin:0;
padding:0;
List-style:none;
}
. box{
width:1000px;
height:300px;
position:relative;
margin:30px Auto;
Overflow:hidden;
}
. box. boxinner{
width:4000px;
Position:absolute;
left:0;
top:0;
}
. box. Boxinner div{
width:1000px;
height:300px;
Float:left;
}
. box. Boxinner Div img{
width:100%;
height:100%;
}
. Box ul{
Position:absolute;
right:10px;
bottom:10px;
}
. Box UL li{
width:18px;
height:18px;
Background: #ccc;
border-radius:50%;
margin-left:10px;
Float:left;
Cursor:pointer;
}
. Box UL li.on{
Background:lightblue;
}
. Box a{
width:30px;
height:30px;
Position:absolute;
top:127px;
border:10px solid red;
Border-left:none;
Border-bottom:none;
opacity:0.3;
Filter:alpha (opacity=30);
Display:none;
}
. Box a:hover{
Opacity:1;
Filter:alpha (opacity=100);
}
. box. btnleft{
Transform:rotate ( -135DEG);
left:30px;
}
. box. btnright{
Transform:rotate (45DEG);
right:30px;
}

</style>
<body>
<div class= "box" id= "box" >
<div class= "Boxinner" >
<!--<div></div>
<div></div>
<div></div>
<div></div>-->
</div>
<ul>
<!--<li class= "on" ></li>
<li></li>
<li></li>
<li></li>-->
</ul>
<a href= "javascript:;" class= "Btnleft" ></a>
<a href= "javascript:;" class= "Btnright" ></a>
</div>
<script>
function Getcss (curele,attr) {
var val=null;
var reg=null;
if (getComputedStyle) {//Standard
Val=getcomputedstyle (Curele,false) [attr];
}else{//Non-standard
if (attr=== ' opacity ') {
Val=curele.currentstyle.filter; ' Alpha (opacity=10) '
Reg=/^alpha\ (opacity[=:] (\d+) \) $/i;
Return Reg.test (val)? Reg.exec (Val) [1]/100:1;
}
VAL=CURELE.CURRENTSTYLE[ATTR];
}
Reg=/^[+-]? ((\d| ([1-9]\d+)) (\.\d+)?) (Px|pt|rem|em) $/i;
Return Reg.test (val)? parseint (val): Val;
}
function Setcss (curele,attr,value) {
if (attr=== ' float ') {
Curele.style.cssfloat=value;
Curele.style.stylefloat=value;
Return
}
if (attr=== ' opacity ') {
Curele.style.opacity=value;
Curele.style.filter= ' alpha (opacity= ' + (value*100) + ') ';
Return
}
Handling of the Unit
var reg=/^ (width|height|top|right|bottom|left| ( (margin|padding) (Top|right|bottom|left))) $/i;
if (Reg.test (attr)) {
if (! ( value=== ' Auto ' | | Value.tostring (). IndexOf ('% ')!==-1)) {
Value=parsefloat (value) + ' px ';
}
}
Curele.style[attr]=value;
}
function Setgroupcss (curele,opt) {
if (opt.tostring ()!== ' [Object Object] ') return;
for (var attr in opt) {
This.setcss (curele,attr,opt[attr]);
}
}
function css (Curele) {
var arg2=arguments[1];
if (typeof arg2=== ' string ') {
var arg3=arguments[2];
if (typeof arg3=== ' undefined ') {//When the third parameter does not exist, is obtained;
Return This.getcss (CURELE,ARG2);
}else{
This.setcss (CURELE,ARG2,ARG3);
}
}
if (arg2.tostring () = = = ' [Object Object] ') {//Get a set of elements
This.setgroupcss (CURELE,ARG2);
}
}
function Animate (curele,target,duration) {
function Tmpeffect (t, B, C, D) {
Return c * t/d + B;
}
1. Prepare for each parameter of the formula
var begin={};
var change={};
for (var attr in target) {
Begin[attr]=css (CURELE,ATTR);
CHANGE[ATTR]=TARGET[ATTR]-BEGIN[ATTR];
}
duration=duration| | : 0];
var time=0;
2. Turn on a timer to keep the time accumulating, and to find the latest position according to the time and formula;
Clearinterval (Curele.timer); Turn off the useless timer before starting a timer.
Curele.timer=setinterval (function () {
time+=10;
3. Conditions for cessation of movement (time>=duration)
if (time>=duration) {
CSS (curele,target);
Clearinterval (Curele.timer);
Return
}
Get the latest value for each attribute, and assign to the attribute corresponding to the element;
for (var attr in target) {
var curpos=tmpeffect (time,begin[attr],change[attr],duration);
CSS (Curele,attr,curpos);
}
},10)
}
(function () {
Get element
var Obox=document.getelementbyid ("box");
var oboxinner=obox.getelementsbytagname (' div ') [0];
var adiv=oboxinner.getelementsbytagname (' div ');
var oul=obox.getelementsbytagname (' ul ') [0];
var ali=oul.getelementsbytagname (' Li ');
var obtnleft=obox.getelementsbytagname (' a ') [0];
var obtnright=obox.getelementsbytagname (' a ') [1];
var data=null;
var timer=null;
var step=0;
1. Get and parse data
GetData ();
function GetData () {
var xml=new xmlhttprequest;
Xml.open (' Get ', ' json/data.txt ', false);
Xml.onreadystatechange=function () {
if (xml.readystate==4 &&/^2\d{2}$/.test (xml.status)) {
Data=json.parse (Xml.responsetext);
}
};
Xml.send ();
}
2. Binding Data
Bind ();
function bind () {
var strdiv= ';
var strli= ';
for (var i=0; i<data.length; i++) {
strdiv+= ' <div></div> ';
Strli+=i===0? ' <li class= "On" ></li> ': ' <li></li> ';
}
strdiv+= ' <div></div> ';
Oboxinner.innerhtml+=strdiv;
oboxinner.style.width=adiv.length*adiv[0].offsetwidth+ ' px ';
Oul.innerhtml+=strli;
}

3. Automatic Picture Carousel
Timer=setinterval (automove,1400);
function Automove () {
if (step>=adiv.length-1) {
Step=0;
CSS (Oboxinner, ' left ', 0)
}
step++;
Animate (oboxinner,{left:-step*1000});
Bannertip ();
}
4. Focus Auto-Carousel
function Bannertip () {
var tmpstep=step>=ali.length?0:step;
for (var i=0; i<ali.length; i++) {
Ali[i].classname=i==tmpstep? ' On ': null;
}
}

5. Mouse move stop, move out continue
Obox.onmouseover=function () {
Clearinterval (timer);
obtnleft.style.display= ' block ';
obtnright.style.display= ' block ';
};
Obox.onmouseout=function () {
Timer=setinterval (automove,1400);
Obtnleft.style.display= ' None ';
Obtnright.style.display= ' None ';
};
6. Click Focus to switch manually
HandleChange ();
function HandleChange () {
for (var i=0; i<ali.length; i++) {
Ali[i].index=i;
Ali[i].onclick=function () {
Step=this.index;
Animate (oboxinner,{left:-step*1000});
Bannertip ();
}
}
}
7. Click the left and right buttons to switch manually
Obtnright.onclick=automove;
Obtnleft.onclick=function () {
if (step<=0) {
Step=adiv.length-1;
CSS (Oboxinner, ' left ',-step*1000);
}
step--;
Animate (oboxinner,{left:-step*1000});
Bannertip ();
}
})();
</script>
</body>
javascript:100% native JS implementation of the left and right switch Carousel diagram (no delay loading)

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.

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