[英]Add “next” and “previous” buttons to dynamic Lightbox gallery
我創建了一個動態燈箱畫廊,並希望添加“下一個”和“上一個”功能。 我過去幾天一直在努力,但總是碰壁。
這是我的代碼(我將包括所有內容,因此更有意義):
我的gallery.php文件包含在index.php中。 您可以通過將圖像添加到目錄來將圖像添加到圖庫。 我正在為每個圖像分配ID。 :
<?php
//function call
return showImages();
//function definition
function showImages(){
$out = "<h1>Image Gallery</h1>";
$out .= "<ul id='images'>";
$folder = "img";
$filesInFolder = new DirectoryIterator($folder);
$imgnumber = 1;
while ($filesInFolder->valid()){
$file = $filesInFolder->current();
$filename = $file->getFilename();
$src = "$folder/$filename";
$fileInfo = new Finfo( FILEINFO_MIME_TYPE );
$mimeType = $fileInfo->file($src);
if ($mimeType === 'image/jpeg'){
$out.= "<li><img id='imgnumber$imgnumber' src='$src' /></li>";
$imgnumber = $imgnumber + 1;
}
$filesInFolder->next();
}
$out .= "</ul>";
return $out;
}
請記住漸進增強,這是我的JS文件:
function init (){
window.console.log("welcome newww user");
var lightboxElements = "<div id='lightbox'>";
lightboxElements += "<div id='overlay' class='hidden'></div>";
lightboxElements += "<img class='hidden' id='big-image' />";
lightboxElements += "<div id='navigation' class='hidden'>";
lightboxElements += "<div id='next'>Next</div><div id='prev'>Prev</div>";
lightboxElements += "</div>";
lightboxElements += "</div>";
document.querySelector("body").innerHTML += lightboxElements;
var bigImage = document.querySelector("#big-image")
bigImage.addEventListener("click",toggle,false);
var overlay = document.querySelector("#overlay")
overlay.addEventListener("click",toggle,false);
prepareThumbs();
}
function toggle(){
var clickedImage = event.target;
var bigImage = document.querySelector("#big-image");
var overlay = document.querySelector("#overlay");
var navigation = document.querySelector("#navigation");
bigImage.src = clickedImage.src;
//if overlay is hidden, we can assume the big image is hidden
if (overlay.getAttribute("class") === "hidden"){
overlay.setAttribute("class", "showing");
bigImage.setAttribute("class", "showing");
navigation.setAttribute("class", "showing");
} else {
overlay.setAttribute("class", "hidden");
bigImage.setAttribute("class", "hidden");
navigation.setAttribute("class", "hidden");
}
}
function prepareThumbs(){
var liElements = document.querySelectorAll("ul#images li");
var i = 0;
var image, li;
//loop through all <li> liElements
while (i < liElements.length){
li = liElements[i];
//set class='lightbox'
li.setAttribute("class", "lightbox");
image = li.querySelector("img");
//register a click event handeler for the <img> Elements
image.addEventListener("click", toggle, false);
i += 1;
}
}
document.addEventListener("DOMContentLoaded", init, false);
這是CSS文件:
h1{
color:red;
}
div#overlay {
position: absolute;
width: 100%;
height: 100%;
top: 0px;
left: 0px;
background:black;
opacity: 0.85;
transition: opacity 1s ease-in;
}
/* hide overlay and big-image and navigation */
div#overlay.hidden, img#big-image.hidden, div#navigation.hidden {
opacity: 0;
left: -200%;
}
/* resize images and display them as a horisontal list */
li.lightbox img {
height: 100px;
}
li.lightbox {
display: inline-block;
margin: 10px;
}
#big-image.showing{
max-width: 80%;
max-height: 90%;
position: absolute;
background-color: white;
padding: 10px;
top: 5%;
left: 10%;
}
#navigation.showing {
max-width: 80%;
max-height: 90%;
position: absolute;
background-color: white;
padding: 10px;
top: 5%;
left: 10%;
}
我的問題是,如何將這個功能添加到上面的代碼中?
我希望可以保留編寫的代碼,但是,如果此代碼無法實現此功能,則歡迎提出建議。 如果您需要更多信息,請在評論中讓我知道。
大概是這樣的。 您可以將此修改為您的代碼。 您需要在buttonHandler
方法中調用toggle
功能。 我添加了一些評論來幫助您。
let next = document.getElementById("next"); let previous = document.getElementById("previous"); let result = document.getElementById("result"); class ImageManager { constructor(imageElements, buttonPrevious, buttonNext, resultElement){ if(imageElements.length === 0) return; this.imageElements = imageElements; this.sentinel = imageElements[0]; this.index = 0; this.resultElement = resultElement; buttonPrevious.addEventListener("click", ()=>this.buttonHandler(-1), false); buttonNext.addEventListener("click", ()=>this.buttonHandler(1), false); this.resultElement.innerHTML = this.sentinel.innerHTML; } buttonHandler(val){ this.index = (this.index+val+this.imageElements.length) % this.imageElements.length; this.sentinel = this.imageElements[this.index]; this.resultElement.innerHTML = this.sentinel.innerHTML; //THIS IS WHERE YOU WANT TO CALL TOGGLE //this.sentinel is your clicked image. Just need to pass it to your toggle function as a parameter and use it. } } let images = document.querySelectorAll(".light-box"); let imageManager = new ImageManager(images, previous, next, result);
<div class="light-box">image1</div> <div class="light-box">image2</div> <div class="light-box">image3</div> <div class="light-box">image4</div> <div class="light-box">image5</div> <div class="light-box">image6</div> <div class="light-box">image7</div> <button id="next">Next</button> <button id="previous">Previous</button> <div id="result"></div>
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