Auto ImageSlider无法与SetInterval（）配合使用-JavaScript / JQuery
问题：想创建一个简单的javascript / jquery自动图像滑块，但似乎无法正常工作。
// jquery //
$(document).ready(function() {
$("#imgSlider_img1").show();
$("#imgSlider_img2").hide();
$("#imgSlider_img3").hide();
$("#imgSlider_img4").hide();
})
// slider //
var current_image_number = 1;
function slider() {
if (current_image_number == 1) {
$("#imgSlider_img1").hide();
$("#imgSlider_img2").show('fast');
$("#imgSlider_img3").hide();
$("#imgSlider_img4").hide();
current_image_number = 2;
}
if (current_image_number == 2) {
$("#imgSlider_img1").hide();
$("#imgSlider_img2").hide();
$("#imgSlider_img3").show('fast');
$("#imgSlider_img4").hide();
current_image_number = 3;
}
if (current_image_number == 3) {
$("#imgSlider_img1").hide();
$("#imgSlider_img2").hide();
$("#imgSlider_img3").hide();
$("#imgSlider_img4").show('fast');
current_image_number = 4;
}
if (current_image_number == 4) {
$("#imgSlider_img1").show('fast');
$("#imgSlider_img2").hide();
$("#imgSlider_img3").hide();
$("#imgSlider_img4").hide();
current_image_number = 1;
}
}
window.setInterval(slider, 4000);.imgSlider {
height: 500px;
margin-left: 10%;
margin-right: 10%;
margin-top: 10px;
box-shadow: 5px 5px 5px #333;
}
.imgSlider img {
width: 100%;
height: 100%;
}<div class="imgSlider">
<img id="imgSlider_img1" src="images/index/imgSlider_img1.png">
<img id="imgSlider_img2" src="images/index/imgSlider_img2.jpg">
<img id="imgSlider_img3" src="images/index/imgSlider_img3.jpg">
<img id="imgSlider_img4" src="images/index/imgSlider_img4.jpg">
</div>
逻辑：我想使用当前的html方案制作一个简单的自动滑块。我希望能够在'imgSlider'div内递增，或者通过ID更改图像（如当前图像）。但是问题在于每个间隔之后，所有图像都会显示出来。
感谢您的帮助！
3 个答案:
答案 0 :(得分：2)
对于4 if's，将执行所有if's。因此，我们假设在入口点 index 的值为1。前true将是if，并将 index 设置为2。现在，第二个if条件也变为true，它将 index 设置为3。依此类推，直到将值重置为1。
因此，您需要使用if's代替4 if else
// jquery //
$(document).ready(function(){
$("#imgSlider_img1").show();
$("#imgSlider_img2").hide();
$("#imgSlider_img3").hide();
$("#imgSlider_img4").hide();
})
// slider //
var current_image_number = 1;
function slider() {
if (current_image_number == 1) {
$("#imgSlider_img1").hide();
$("#imgSlider_img2").show('fast');
$("#imgSlider_img3").hide();
$("#imgSlider_img4").hide();
current_image_number = 2;
} else if (current_image_number == 2) {
$("#imgSlider_img1").hide();
$("#imgSlider_img2").hide();
$("#imgSlider_img3").show('fast');
$("#imgSlider_img4").hide();
current_image_number = 3;
} else if (current_image_number == 3) {
$("#imgSlider_img1").hide();
$("#imgSlider_img2").hide();
$("#imgSlider_img3").hide();
$("#imgSlider_img4").show('fast');
current_image_number = 4;
} else if (current_image_number == 4) {
$("#imgSlider_img1").show('fast');
$("#imgSlider_img2").hide();
$("#imgSlider_img3").hide();
$("#imgSlider_img4").hide();
current_image_number = 1;
}
}
window.setInterval(slider, 4000);.imgSlider {
height: 500px;
margin-left: 10%;
margin-right: 10%;
margin-top: 10px;
box-shadow: 5px 5px 5px #333;
}
.imgSlider img {
width: 100%;
height: 100%;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="imgSlider">
<img id="imgSlider_img1" alt="imgSlider_img1" src="images/index/imgSlider_img1.png">
<img id="imgSlider_img2" alt="imgSlider_img2" src="images/index/imgSlider_img2.jpg">
<img id="imgSlider_img3" alt="imgSlider_img3" src="images/index/imgSlider_img3.jpg">
<img id="imgSlider_img4" alt="imgSlider_img4" src="images/index/imgSlider_img4.jpg">
</div>
您可以进一步简化代码以遵循
// jquery //
$(document).ready(function(){
$(".imgSlider > img").hide(); // hide all images
$("#imgSlider_img1").show(); // show 1st image
});
var current_image_number = 1;
function slider() {
$(".imgSlider > img").hide(); // hide all images
current_image_number = ++current_image_number > 4 ? 1 : current_image_number; // calculate the next image
$("#imgSlider_img" + current_image_number).show('fast'); // show the image
}
window.setInterval(slider, 4000);.imgSlider {
height: 500px;
margin-left: 10%;
margin-right: 10%;
margin-top: 10px;
box-shadow: 5px 5px 5px #333;
}
.imgSlider img {
width: 100%;
height: 100%;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="imgSlider">
<img id="imgSlider_img1" alt="imgSlider_img1" src="images/index/imgSlider_img1.png">
<img id="imgSlider_img2" alt="imgSlider_img2" src="images/index/imgSlider_img2.jpg">
<img id="imgSlider_img3" alt="imgSlider_img3" src="images/index/imgSlider_img3.jpg">
<img id="imgSlider_img4" alt="imgSlider_img4" src="images/index/imgSlider_img4.jpg">
</div>
答案 1 :(得分：2)
我已经稍微简化了您的JS逻辑，以使事情更加清楚。简化的JS还可以让您无需触摸JS即可从HTML添加或删除图像：
// all images
var images = document.querySelectorAll('.imgSlider img');
// currently active number
var active = 1;
// slider
function activate() {
for (var i=0; i<images.length; i++) {
images[i].style.display = 'none';
}
// display the active image;
document.querySelector('#imgSlider_img' + active).style.display = 'block';
// increment the active image number
active++;
if (active > images.length) active = 1;
}
window.setInterval(activate, 3000);
activate();.imgSlider {
height: 500px;
margin-left: 10%;
margin-right: 10%;
margin-top: 10px;
box-shadow: 5px 5px 5px #333;
position: relative;
}
.imgSlider img {
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
}<div class="imgSlider">
<img id="imgSlider_img1" src="https://placeimg.com/640/480/1.jpg">
<img id="imgSlider_img2" src="https://placeimg.com/640/480/2.jpg">
<img id="imgSlider_img3" src="https://placeimg.com/640/480/3.jpg">
<img id="imgSlider_img4" src="https://placeimg.com/640/480/4.jpg">
</div>
要执行此操作，您需要增加存储当前活动图像的整数。您想要在更改图像的函数中执行此操作。
增加该活动图像的数量时，还应检查增加的数量是否大于最大图像数量。如果是这样，则应将活动图像编号设置为1。
仅此而已！
答案 2 :(得分：1)
如果出现许多图像，则意味着上述条件是否解决了问题。因此，我建议使用以下类型的JavaScript图像滑块。
var _imgPath = {
"imageDetails": [{
"Id": "F0001",
"Name": "figure1.jpg",
"Src": 'https://homepages.cae.wisc.edu/~ece533/images/airplane.png'
},
{
"Id": "F0002",
"Name": "figure2.jpg",
"Src": 'https://homepages.cae.wisc.edu/~ece533/images/arctichare.png'
},
{
"Id": "F0003",
"Name": "figure3.jpg",
"Src": 'https://homepages.cae.wisc.edu/~ece533/images/baboon.png'
},
{
"Id": "F0004",
"Name": "figure4.jpg",
"Src": 'https://homepages.cae.wisc.edu/~ece533/images/barbara.png'
},
{
"Id": "F0005",
"Name": "figure5.jpg",
"Src": 'https://homepages.cae.wisc.edu/~ece533/images/boat.png'
},
{
"Id": "F0006",
"Name": "figure6.jpg",
"Src": 'https://homepages.cae.wisc.edu/~ece533/images/cat.png'
},
{
"Id": "F0007",
"Name": "figure7.jpg",
"Src": 'https://homepages.cae.wisc.edu/~ece533/images/fruits.png'
},
{
"Id": "F0008",
"Name": "figure8.jpg",
"Src": 'https://homepages.cae.wisc.edu/~ece533/images/frymire.png'
},
{
"Id": "F0009",
"Name": "figure9.jpg",
"Src": 'https://homepages.cae.wisc.edu/~ece533/images/girl.png'
},
{
"Id": "F00010",
"Name": "figure10.jpg",
"Src": 'https://homepages.cae.wisc.edu/~ece533/images/monarch.png'
}
]
}
var currentImage, LastImage;
function initLoader(arg_imgPath) {
if (arg_imgPath.imageDetails.length > 0) {
sliderImgTag.src = arg_imgPath.imageDetails[0]['Src'];
sliderImgTag.setAttribute('cid', arg_imgPath.imageDetails[0]['Id']);
sliderImgTag.setAttribute('alt', arg_imgPath.imageDetails[0]['name']);
currentImage = 0;
document.querySelector('.Prod_Arrow.left').style.visibility = "hidden"
}
document.querySelector('.Prod_Arrow.right').addEventListener('click', function () {
btnArrowShift((currentImage + 1), true);
})
document.querySelector('.Prod_Arrow.left').addEventListener('click', function () {
btnArrowShift((currentImage - 1), false);
})
}
initLoader(_imgPath);
document.querySelector('.Prod_Arrow.right').addEventListener('click', function () {
btnArrowShift((currentImage + 1), true);
})
document.querySelector('.Prod_Arrow.left').addEventListener('click', function () {
btnArrowShift((currentImage - 1), false);
})
function btnArrowShift(value, types) {
if (types) {
if (value != _imgPath.imageDetails.length) {
document.querySelector('.Prod_Arrow.left').style.visibility = "visible"
sliderImgTag.src = _imgPath.imageDetails[value]['Src'];
sliderImgTag.setAttribute('cid', _imgPath.imageDetails[value]['Id']);
sliderImgTag.setAttribute('alt', _imgPath.imageDetails[value]['name']);
currentImage = value;
if (value === (_imgPath.imageDetails.length - 1)) {
document.querySelector('.Prod_Arrow.right').style.visibility = "hidden";
}
}
} else {
if (value != _imgPath.imageDetails.length) {
document.querySelector('.Prod_Arrow.right').style.visibility = "visible"
sliderImgTag.src = _imgPath.imageDetails[value]['Src'];
sliderImgTag.setAttribute('cid', _imgPath.imageDetails[value]['Id']);
sliderImgTag.setAttribute('alt', _imgPath.imageDetails[value]['name']);
currentImage = value;
if (value === 0) {
document.querySelector('.Prod_Arrow.left').style.visibility = "hidden";
}
}
}
}
setInterval(function () {
if (currentImage != _imgPath.imageDetails.length) {
if (currentImage === (_imgPath.imageDetails.length - 1)) {
currentImage = 0;
document.querySelector('.Prod_Arrow.right').style.visibility = "visible";
document.querySelector('.Prod_Arrow.left').style.visibility = "hidden";
} else if(currentImage === (0)) {
currentImage = currentImage + 1;
document.querySelector('.Prod_Arrow.left').style.visibility = "visible";
} else if(currentImage !== (0)){
currentImage = currentImage + 1;
document.querySelector('.Prod_Arrow.left').style.visibility = "visible";
}
sliderImgTag.src = _imgPath.imageDetails[currentImage]['Src'];
sliderImgTag.setAttribute('cid', _imgPath.imageDetails[currentImage]['Id']);
sliderImgTag.setAttribute('alt', _imgPath.imageDetails[currentImage]['name']);
}
}, 5000)@import url("https://fonts.googleapis.com/css?family=Nunito:400,600,700");
/* font-family: 'Nunito', sans-serif; */
:after,
:before,
* {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
*::selection {
background: transparent;
}
.Prod-dialog * {
font-family: "Nunito", sans-serif;
}
.Prodclear {
clear: both;
}
.Prod-pull-right {
float: right !important;
}
.Prod-pulk-left {
float: left !important;
}
.Prod-col-4 {
width: 45%;
float: left;
padding: 0px 15px;
}
.Prod-col-8 {
width: 55%;
float: left;
padding: 0px 15px 0px 30px;
}
/* dialog start */
.Prod-dialog.active {
visibility: visible;
position: fixed;
background: rgb(33, 32, 32);
left: 0px;
right: 0px;
bottom: 0px;
top: 0px;
transition: all 0.5s;
padding: 30px;
z-index: 99999;
}
.Prod-container {
max-width: 1440px;
background: #fff;
margin: auto;
/* box-shadow: 0px 0px 15px #ffffff; */
padding: 0px;
margin-top: 50px;
max-height: calc(100vh - 90px);
overflow-y: auto;
background: linear-gradient(to right, white 44%, #f9fafb 44%);
}
.Prod-Gallery-footer .Prod-col-8 {
padding-right: 0px;
}
/* width */
.Prod-container::-webkit-scrollbar,
.Prod_slider::-webkit-scrollbar {
width: 10px;
height: 10px;
}
/* Track */
.Prod-container::-webkit-scrollbar-track,
.Prod_slider::-webkit-scrollbar-track {
background: #f1f1f1;
}
/* Handle */
.Prod-container::-webkit-scrollbar-thumb,
.Prod_slider::-webkit-scrollbar-thumb {
background: #888;
border-radius: 4px;
}
/* Handle on hover */
.Prod-container::-webkit-scrollbar-thumb:hover {
background: #555;
}
.Prod-scroll-hidden {
overflow: hidden;
}
#Prod-dialog-close {
position: absolute;
right: 40px;
top: 15px;
width: 40px;
height: 40px;
opacity: 1;
background: #fff;
border-radius: 50%;
}
#Prod-dialog-close:hover {
opacity: 1;
}
#Prod-dialog-close:before,
#Prod-dialog-close:after {
position: absolute;
left: 19px;
content: " ";
height: 24px;
width: 2px;
background-color: #212020;
z-index: 4;
/* z-index: 888; */
top: 9px;
}
#Prod-dialog-close:before {
transform: rotate(45deg);
}
#Prod-dialog-close:after {
transform: rotate(-45deg);
}
/* dialog end */
/* header start */
.Prod-header h2 {
color: #252525;
font-size: 26px;
font-weight: 700;
line-height: 33px;
text-align: left;
position: relative;
margin: 0px 0px 25px 0px;
padding: 0px 0px 15px 0px;
}
.Prod-header h2:before {
position: absolute;
content: "";
width: 65px;
height: 3px;
background: #fa7000;
bottom: 0px;
}
/* header end*/
/* footer start */
.Prod-footer {
padding: 15px;
background: #fff;
}
.Prod-footer p {
color: #6a7070;
font-size: 16px;
font-weight: 500;
line-height: 24px;
text-align: center;
margin: 0px;
}
.Prod-footer p a {
color: #6a7070;
text-decoration: none;
}
/* footer end */
/* form start*/
.Prod-invoice-sec {
max-width: 994px;
margin: auto;
/* background: #f1f1f1;
background: linear-gradient(to right, white 40%, #f9fafb 40%); */
margin-bottom: 0px;
padding-bottom: 0px;
padding: 30px;
border-bottom: 1px solid #979797;
}
.Prod-col-6 {
width: 50%;
padding: 0px 15px;
float: left;
}
.Prod-row {
margin: 0px -15px;
}
.Prod-form-row {
margin-bottom: 15px;
}
.Prod-form-row label {
color: #9b9b9b;
font-size: 16px;
font-weight: 600;
line-height: 19px;
}
.Prod-form-row p {
color: #252525;
font-size: 16px;
font-weight: 600;
line-height: 22px;
margin: 0px;
}
/* form end*/
/* Gallery Start */
.Prod-Gallery {
margin: 15px 0px;
}
.Prod-Gallery-Header {
position: relative;
border-bottom: 1px solid #979797;
padding-bottom: 8px;
}
.Prod-Gallery-Header h2 {
color: #6a7070;
font-size: 16px;
font-weight: 900;
line-height: 19px;
margin: 0px;
padding: 10px 0px;
display: inline-block;
}
.Prod-tabs {
margin: 0px;
padding: 0px;
position: absolute;
right: 0px;
top: 5px;
}
.Prod-tabs li {
margin: 0px;
padding: 0px;
display: inline-block;
font-size: 16px;
line-height: 32px;
padding: 0px 8px 0px 8px;
position: relative;
cursor: pointer;
border-radius: 6px;
}
ul.Prod-tabs img {
width: 18px;
vertical-align: middle;
cursor: pointer;
}
li#Prod-tab1.active,
li#Prod-tab2.active {
background: #ddd;
}
.Prod-Gallery-body {
padding: 15px 0px 15px 0px;
}
/* Gallery Start */
/* Tab Start */
.Prod-tab-link.current {
background: #d8d8d8;
color: #5b5b5b;
}
.Prod-tab-link.current {
display: inline-block;
}
.Prod-tab-content {
display: none;
}
.Prod-tab-content.current {
display: block;
}
li#ProdSelectedTab.current {
background: transparent;
}
/* Tab End*/
/* selected */
.Prod-grid-group li {
position: relative;
}
.Prod-grid-group li.selected {
position: relative;
}
.Prod-grid-group li.selected:after {
content: "";
display: block;
position: absolute;
background: rgba(250, 112, 0, 0.6);
left: 0px;
right: 0px;
top: 0px;
bottom: 0px;
}
.Prod-grid-group li.selected:before {
content: "";
display: block;
width: 18px;
height: 30px;
border: solid #fff;
border-width: 0 3px 3px 0;
transform: rotate(45deg);
position: absolute;
top: 35px;
left: 50px;
z-index: 1;
}
.Prod-grid-group {
margin: 0px;
padding: 0px;
margin-left: -15px;
}
.Prod-grid-group li {
margin: 0px;
padding: 0px;
width: 110px;
height: 110px;
list-style-type: none;
display: inline-block;
overflow: hidden;
margin-left: 16px;
margin-bottom: 16px;
border-radius: 5px;
}
.Prod-grid-group li img {
max-width: 100%;
}
table.Prod-table {
border-collapse: collapse;
width: 100%;
}
table.Prod-table tfoot tr td {
border-top: 1px solid #979797;
border-bottom: 1px solid #979797;
padding: 18px 0px;
font-size: 18px;
}
table.Prod-table td,
table.Prod-table th {
text-align: left;
}
table.Prod-table tr th,
table.Prod-table tr td {
padding: 5px 40px 10px 0px;
}
.Prod-table thead th {
font-weight: 700;
color: #6a7070;
font-size: 16px;
}
.Prod-table tbody td {
font-size: 16px;
font-weight: 600;
line-height: 22px;
text-align: left;
color: #252525;
}
.Prod-table tfoot td {
font-weight: 700;
color: #252525;
font-size: 16px;
}
.Prod-payment-action {
padding: 50px 0px 0px 0px;
text-align: right;
}
.Prod-payment-action button {
border: 2px solid #fa7000;
opacity: 0.8;
border-radius: 5px;
display: inline-block;
padding: 8px 15px;
background: transparent;
text-transform: uppercase;
color: #fa7000;
font-weight: 700;
margin-left: 15px;
}
.Prod-payment-action button:hover {
color: #fff;
background-color: #fa7000;
box-shadow: 0 2px 6px 4px rgba(250, 112, 0, 0.25);
}
/* slider start */
.Prod_slider {
white-space: nowrap;
overflow-x: auto;
overflow-y: hidden;
margin-bottom: 35px;
}
.lSSlideOuter .lSPager.lSGallery img {
width: 100%;
}
/* slider End */
.Prod_slider ul li {
white-space: nowrap;
margin-bottom: 0px;
}
.Prodt-mark {
position: relative;
width: 20px;
height: 20px;
border: 1px solid #bfc3c3;
float: left;
margin-right: 10px;
top: 5px;
border-radius: 4px;
}
.Prodt-mark::before {
content: "";
display: block;
width: 6px;
height: 14px;
border: solid transparent;
border-width: 0 2px 2px 0;
transform: rotate(45deg);
position: absolute;
top: 0px;
left: 6px;
z-index: 1;
}
.Prod-tab-link.current .Prodt-mark {
background: #bfc3c3;
}
.Prod-tab-link.current .Prodt-mark::before {
content: "";
display: block;
width: 6px;
height: 14px;
border: solid #fff;
border-width: 0 2px 2px 0;
transform: rotate(45deg);
position: absolute;
top: 0px;
left: 6px;
z-index: 1;
}
.Prod-Caption {
margin: 8px 0px 0px 0px;
font-size: 14px;
}
.newImgViewer {
width: 150px;
height: 800px;
}
.Prod_slider {
position: relative;
}
.Prod_Arrow {
width: 50px;
height: 50px;
background: #bfc3c3;
border-radius: 50%;
position: absolute;
cursor: pointer;
}
.Prod_Arrow.left {
left: 0px;
top: 45%;
}
.Prod_Arrow.left::before {
position: absolute;
content: "";
top: 20px;
left: 20px;
border: solid #fff;
border-width: 0 3px 3px 0;
display: inline-block;
padding: 3px;
transform: rotate(135deg);
-webkit-transform: rotate(135deg);
}
.Prod_Arrow.right {
right: 0px;
top: 45%;
}
.Prod_Arrow.right::before {
position: absolute;
content: "";
top: 20px;
left: 20px;
border: solid #fff;
border-width: 0 3px 3px 0;
display: inline-block;
padding: 3px;
-webkit-transform: rotate(-45deg);
transform: rotate(-45deg);
}
.Prod-slider-view {
text-align: center;
position: relative;
height: 450px;
}
.Prod-slider-view img {
height: 400px;
border-radius: 6px;
vertical-align: middle;
margin-top: 25px;
}
.Prod_Selected {
width: 50px;
height: 50px;
position: absolute;
top: 30px;
right: 200px;
border-radius: 4px;
}
.Prod_Selected[isselected="true"]::before {
content: "";
display: block;
width: 8px;
height: 16px;
border: solid #fff;
border-width: 0 3px 3px 0;
transform: rotate(45deg);
position: absolute;
top: 15px;
left: 20px;
z-index: 1;
}
.Prod_Selected::after {
content: "";
display: block;
position: absolute;
background: #bfc3c3;
left: 0px;
right: 0px;
top: 0px;
bottom: 0px;
border-radius: 6px;
}
.allitems li {
display: none;
}
.allitems li.selected {
display: inline-block;
}
#Prod-grid-slider li.isactive {
border: 4px solid #fa7000;
}
#Prod-grid-slider li {
border: 4px solid transparent;
}
#ProdSelectedTab.current span.ProdAllImages {
display: none;
}
span.ProdAllImages {
display: none;
}
.Prod-tab-link.current span.ProdSelectedImg {
display: inline-block;
}<html>
<head>
<title>Parcel Sandbox</title>
<meta charset="UTF-8" />
<link rel="stylesheet" type="text/css" media="screen" href="src/index.css" />
</head>
<body>
<div class="Prod-dialog">
<div class="Prod-container">
<div class="Prod-invoice-sec">
<div class="Prod-header">
<h2>Slider</h2>
</div>
<div class="Prod-container-body">
<div class="Prod-Gallery">
<div class="Prod-Gallery-body">
<!--Wrapper to contain interchanging content-->
<div class="Prod-tabs-wrapper">
<div id="ProdSliderContent" class="Prod-tab-content current">
<div class="Prod-slider-view">
<img id="sliderImgTag">
<div class="Prod_Arrow left"></div>
<div class="Prod_Arrow right"></div>
</div>
<div class="Prod_slider">
<ul class="Prod-grid-group" id="Prod-grid-slider"> </ul>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="Prod-footer">
<p>Prasanna Brabourame</p>
<p>Open Source Enthusiasts</p>
<p>Place:
<a> Puducherry,Pondicherry,INDIA</a>
</p>
<p>Email:
<a href="mailto:prasanna18101994@gmail.com">prasanna18101994@gmail.com</a>
</p>
</div>
</div>
<script src="src/index.js"></script>
</body>
</html>
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