Changing javascript background image using an array
I am not an exprienced javascript programmer, so I try to play with javascript. I am trying to make a slideshow by clicking on a button. Function I am trying to make a function with an array that contains the names of all images and changes the background image to match the index of the array. I have only completed this part of the function and I cannot figure out what is wrong.
function change(lol){
var img = ["veni1.jpg", "veni2.jpg", "veni3"];
var middle = document.getElementById("vvvmiddle");
var index = img.indexOf(middle.style.backgroundImage);
if(change === "right"){
var current = index + 1;
middle.style.backgroundImage = img[current];
}
}
middle {
width:1262px;
height:550px;
background-color: white;
margin-left: -7px;
}
#vvvmiddle {
width:700;
height:400;
background-image:url('veni1.jpg');
margin: 20px 0px 0px 310px;
float:left;
}
#sipka {
width:40;
height:40;
border-radius: 100px;
background-color: #DCDCDC;
float:right;
margin: 450px 410px 0px 0px;
}
#sipkatext {
font-family: Impact;
color: white;
font-size: 30px;
padding-left: 10px;
padding-top: 1px;
}
#sipkaurl {
text-decoration: none;
}
#sipka:hover {
background-color: #3399FF;
}
#sipka2:hover {
background-color: #3399FF;
}
#sipka2 {
width:40;
height:40;
border-radius: 100px;
background-color: #DCDCDC;
float:right;
margin: 450px -100px 0px 0px;
}
#sipkatext2 {
font-family: Impact;
color: white;
font-size: 30px;
padding-left: 13px;
padding-top: 1px;
}
<div id="middle">
<div id="vvvmiddle">
<div id="sipka" onclick="change('left')">
<div id="sipkatext">
<</div>
</div>
<div id="sipka2" onclick="change('right')">
<div id="sipkatext2">></div>
</div>
</div>
</div>
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3 answers
A possible solution could be as follows:
var img = ["img1.png", "img2.png", "img3.png"];
var len = img.length;
var url = 'Some url...';
var current=0;
var middle = document.getElementById("vvvmiddle");
middle.style.backgroundImage = "url(" + url + img[current] + ")";
function change(dir){
if(dir == "right" && current < len-1){
current++;
middle.style.backgroundImage = "url(" + url + img[current] + ")";
} else if(dir == "left" && current > 0){
current--;
middle.style.backgroundImage = "url(" + url + img[current] + ")";
}
}
See it in action, here's the jsfiddle .
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You may try:
function change(lol) {
var img = ["veni1.jpg", "veni2.jpg", "veni3"];
var middle = document.getElementById("vvvmiddle");
var index = img.indexOf(middle.style.backgroundImage);
if(lol === "right"){
index = (index + 1) % img.length;
} else {
index = (index + img.length - 1) % img.length;
}
middle.style.backgroundImage = img[index];
}
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