向上一个/下一个图像幻灯片添加计数器(仅限javascript/css)?
我已经用javascript创建了一个“prev/next”幻灯片,现在我想在“prev/next”按钮旁边添加一个计数器(1/10、2/10、3/10…),但似乎没有任何效果 这是我第一次尝试创建网站,我对jQuery一无所知,所以如果可能的话,请坚持使用html+javascript。这是我的剧本向上一个/下一个图像幻灯片添加计数器(仅限javascript/css)?,javascript,html,css,slideshow,counter,Javascript,Html,Css,Slideshow,Counter,我已经用javascript创建了一个“prev/next”幻灯片,现在我想在“prev/next”按钮旁边添加一个计数器(1/10、2/10、3/10…),但似乎没有任何效果 这是我第一次尝试创建网站,我对jQuery一无所知,所以如果可能的话,请坚持使用html+javascript。这是我的剧本 var image = new Array( "http://i990.photobucket.com/albums/af24/callmeaaaaj/AJ/_MG_7747.jpg", "ht
var image = new Array(
"http://i990.photobucket.com/albums/af24/callmeaaaaj/AJ/_MG_7747.jpg",
"http://i990.photobucket.com/albums/af24/callmeaaaaj/AJ/1109163s.jpg")
var imgNumber=1
var numberOfImg=2
function previousImage(){
if(imgNumber>1){
imgNumber--
}
else{
imgNumber = numberOfImg
}
document.slideImage.src = image[imgNumber-1]
}
function nextImage(){
if(imgNumber < numberOfImg){
imgNumber++
}
else{
imgNumber = 1
}
document.slideImage.src = image[imgNumber-1]
}
if(document.images){
var image1 = new Image()
image1.src = "http://i990.photobucket.com/albums/af24/callmeaaaaj/AJ/_MG_7747.jpg"
var image2 = new Image()
image2.src = "http://i990.photobucket.com/albums/af24/callmeaaaaj/AJ/1109163s.jpg"
}
var image=新数组(
"http://i990.photobucket.com/albums/af24/callmeaaaaj/AJ/_MG_7747.jpg",
"http://i990.photobucket.com/albums/af24/callmeaaaaj/AJ/1109163s.jpg")
var imgNumber=1
变量numberOfImg=2
函数previousImage(){
如果(imgNumber>1){
imgNumber--
}
否则{
imgNumber=numberOfImg
}
document.slideImage.src=图像[imgNumber-1]
}
函数nextImage(){
如果(imgNumber
脚本+html:
(上一个/下一个按钮似乎不起作用——当我将它们从笔记本电脑启动到浏览器时,它们工作得很好。)您可以使用一些现有的javascript图像滑块,例如,对于您当前的代码,您可以这样做,添加一个元素,如
span
,以保持计数,您可以添加一个函数,如:
function changeCounter(cur, total) {
document.getElementById("counter").innerHTML = cur + "/" + total;
}
并在您的
previousImage()
和nextImage()
函数中调用它,就像在这个演示中一样有许多漂亮的纯css幻灯片,可以做令人印象深刻的事情。然而,当您试图支持较旧的浏览器时,纯css幻灯片的效果越来越差,甚至是不可能的。JavaScript是最灵活、最强大的方式。也就是说,我想帮你清理代码。我只有几分钟的时间,所以这是一个快速组合的插件,但它应该让你走上正确的轨道
首先,请注意您的代码:
下面是我的exampe插件:
如果下面的答案有帮助,请单击最佳答案旁边的“接受”复选标记?
//you're missing semicolons everywhere. ";"
/* "var image" is very unclear.
* it's an array, so it should be plural "images"
* there aren't images in this array - it's image urls or sources
* instead of "new Array" you could just use "[]"
*/
var image = new Array(
"http://i990.photobucket.com/albums/af24/callmeaaaaj/AJ/_MG_7747.jpg",
"http://i990.photobucket.com/albums/af24/callmeaaaaj/AJ/1109163s.jpg")
var imgNumber=1 //the name doesn't mean anything. I have to assume that you mean "currentImgNumber" or something to that effect
var numberOfImg=2 //this could be determined by checking the length of your array - myArray.length
/***** This section is how you use the plugin. I start writing with the usage and then I make it mean something *****/
window.onload = function() { //when the page is loaded
var fooElem = document.getElementById('foo'); //get an element where we will attach the plugin
var foo = Object.create(slideshow); //create a new slideshow object
foo.create({ //create a slideshow with the given options
element: fooElem, //the element where the slideshow will be
sources: [ //image urls
"http://i990.photobucket.com/albums/af24/callmeaaaaj/AJ/_MG_7747.jpg",
"http://i990.photobucket.com/albums/af24/callmeaaaaj/AJ/1109163s.jpg"
]
});
//we can make more of these and with different options
var barElem = document.getElementById('bar');
var bar = Object.create(slideshow);
bar.create({
element: barElem,
sources: [
"http://eggboss.com/wp-content/uploads/2013/09/The-Gentleman-233x300.png",
"http://fc07.deviantart.net/fs71/f/2013/040/8/a/profile_picture_by_classy_like_a_sir-d5uf426.jpg"
]
});
};
/**** now let's create the plugin and make it work as it is used above *****/
var slideshow = {
currentIndex: 0,
imgs: [],
create: function(options) {
options.element.className+= ' slideshow'; //add a class to the main element for styling
this.imgs = this.getImgs(options.sources); //make img html
var controls = this.getControls(); //make controls
//add the html to the element from the options
var frag = document.createDocumentFragment();
this.imgs.forEach(function(img) {
frag.appendChild(img);
});
frag.appendChild(controls);
options.element.appendChild(frag);
},
getImgs: function(sources) {
var imgs = [];
sources.forEach(function(src, i) {
var img = document.createElement('img');
img.src = src;
imgs.push(img);
if (i > 0) {
img.style.display = 'none'; //hide all but first image
}
});
return imgs;
},
getControls: function() {
var that = this; //so that we can access "this" within the click functions
var controls = document.createElement('div');
controls.className = 'controls';
var counter = document.createElement('span');
counter.className = 'counter';
this.setCounter(counter);
var prev = document.createElement('a');
prev.textContent = 'Prev';
prev.className = 'prev';
prev.addEventListener('click', function() {
newIndex = (that.currentIndex) ? that.currentIndex-1 : that.imgs.length-1;
that.changeImg(newIndex, counter);
});
var next = document.createElement('a');
next.textContent = 'Next';
next.className = 'next';
next.addEventListener('click', function() {
newIndex = (that.currentIndex !== that.imgs.length-1) ? that.currentIndex+1 : 0;
that.changeImg(newIndex, counter);
});
controls.appendChild(prev);
controls.appendChild(next);
controls.appendChild(counter);
return controls;
},
changeImg: function(newIndex, counter) {
this.imgs[this.currentIndex].style.display = 'none';
this.imgs[newIndex].style.display = 'inline';
this.currentIndex = newIndex;
this.setCounter(counter);
},
setCounter: function(counter) {
counter.textContent = (this.currentIndex+1)+' / '+this.imgs.length;
}
};