Slider not working Properly?

Question

HTML ------------------------------------------------------------------
<div>
<button id="prev">Prev</button>
<img id="image" src="resources/images/1.jpg">
<button id="next">Next</button>
</div>
JS------------------------------------------------------------------
var images = ["resources/images/1.jpg", "resources/images/2.jpg", "resources/images/3.jpg"];
var slider = document.getElementById("image");
var next = document.getElementById("next");
var currentImage = 0;
next.addEventListener("click", nextFunc);
function nextFunc() {
currentImage ++;
if (currentImage >= images.length) {
currentImage = 0;
} else {
slider.src = images[currentImage];
}
}

Answer 1

Hi Mohamed
You need to use the window.onload function before you call get the document ids
This means that some of you variables will need to pushed into the global scope (not best practice but fine when you are learning):
working code
=================================================
var currentImage = 0,
next,
images,
slider;
function nextFunc() {
currentImage ++;
if (currentImage >= images.length) {
currentImage = 0;
} else {
slider.src = images[currentImage];
}
}
window.onload = function() {
next = document.getElementById("next");
slider = document.getElementById("image");
images = ["resources/images/1.jpg", "resources/images/2.jpg", "resources/images/3.jpg"];
next.addEventListener("click", nextFunc);
}