如何将当前图像文件名添加到滑块

时间:2017-08-17 15:02:57

标签: javascript slider

我是Javascript的新手,并在w3schools.com上找到了添加滑块的代码。

它工作得很好,但我需要在下一个和上一个按钮之间添加当前文件名,我不知道如何。

以下是我使用的代码:

HTML

<div class="slideshow-container">
<div class="mySlides fade">
<div class="numbertext">1 / 3</div>
<img src="img1.jpg" style="width:100%">
<div class="text">Caption Text</div>
</div>

<div class="mySlides fade">
<div class="numbertext">2 / 3</div>
<img src="img2.jpg" style="width:100%">
<div class="text">Caption Two</div>
</div>

<div class="mySlides fade">
<div class="numbertext">3 / 3</div>
<img src="img3.jpg" style="width:100%">
<div class="text">Caption Three</div>
</div>

<a class="prev" onclick="plusSlides(-1)">&#10094;</a>
<a class="next" onclick="plusSlides(1)">&#10095;</a>
</div>
<br>

<div style="text-align:center">
<span class="dot" onclick="currentSlide(1)"></span>
<span class="dot" onclick="currentSlide(2)"></span>
<span class="dot" onclick="currentSlide(3)"></span>
</div> 

CSS

* {box-sizing:border-box}

/* Slideshow container */
.slideshow-container {
max-width: 1000px;
position: relative;
margin: auto;
}

.mySlides {
display: none;
}

 /* Next & previous buttons */
.prev, .next {
cursor: pointer;
position: absolute;
top: 0%;
width: 45%;
margin-top: -22px;
padding: 16px;
color: white;
font-weight: bold;
font-size: 18px;
transition: 0.6s ease;
border-radius: 0 3px 3px 0;
}

/* Position the "next button" to the right */
.next {
right: 0;
border-radius: 3px 0 0 3px;
}
.prev {
text-align: right;
}

/* On hover, add a black background color with a little bit see-through */
.prev:hover, .next:hover {
background-color: rgba(0,0,0,0.8);
}

/* Caption text */
.text {
color: #f2f2f2;
font-size: 15px;
padding: 8px 12px;
position: absolute;
bottom: 8px;
width: 100%;
text-align: center;
}

/* Number text (1/3 etc) */
.numbertext {
color: #f2f2f2;
font-size: 12px;
padding: 8px 12px;
position: absolute;
top: 0;
}

/* The dots/bullets/indicators */
.dot {
cursor:pointer;
height: 13px;
width: 13px;
margin: 0 2px;
background-color: #bbb;
border-radius: 50%;
display: inline-block;
transition: background-color 0.6s ease;
}

.active, .dot:hover {
background-color: #717171;
}

/* Fading animation */
.fade {
-webkit-animation-name: fade;
-webkit-animation-duration: 1.5s;
animation-name: fade;
animation-duration: 1.5s;
}

@-webkit-keyframes fade {
from {opacity: .4}
to {opacity: 1}
}

@keyframes fade {
from {opacity: .4}
to {opacity: 1}
}

Javascript

var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
showSlides(slideIndex += n);
}

function currentSlide(n) {
showSlides(slideIndex = n);
}

function showSlides(n) {
var i;
var slides = document.getElementsByClassName("mySlides");
var dots = document.getElementsByClassName("dot");
if (n > slides.length) {slideIndex = 1}
if (n < 1) {slideIndex = slides.length}
for (i = 0; i < slides.length; i++) {
  slides[i].style.display = "none";
}
for (i = 0; i < dots.length; i++) {
  dots[i].className = dots[i].className.replace(" active", "");
}
slides[slideIndex-1].style.display = "block";
dots[slideIndex-1].className += " active";
} 

所以我将prev和next箭头改为顶部,因为我需要它们。我正在添加3个菜单作为图像,我需要它来说明第1页,第3页,第2页,第3页,第3页,共3页,具体取决于它们所在的菜单。所以我想我需要将图像文件名更改为“第1页,共3页”,“第2页,共3页”和“第3页,共3页”,以使其按照我需要的方式工作。那么如何在我的上一个箭头和下一个箭头之间显示当前文件名?

我希望这一切都有意义!任何帮助将不胜感激!!

谢谢!

1 个答案:

答案 0 :(得分:0)

您可以尝试从JavaScript中获取图片代码的来源,并使用它来更新字幕文字

var ctext = slides[slideIndex - 1].childNodes[1].getAttribute("src")
slides[slideIndex - 1].childNodes[2].innerHTML = ctext