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Set HTML <img> element to Javascript image variable

I have an array of image variables that get preloaded using javascript to make an image sequence animation. The issue I have is setting the img element from HTML to use one of these images. It seems all the properies are strings?
Here's how I set the array of images in javascript:
for(var i = 0; i < 30; i ++){
anim[i] = new Image();
if(i < 10){
anim[i].src = "images/anim/frame0" + i + ".png";
}
if(i >= 10){
anim[i].src = "images/anim/frame" + i + ".png";
}
}
and I simply have an
^img tag = "animation"^
in html that I want to change.

Your code looks valid.
for(var i = 0; i < 30; i++){
anim[i] = new Image();
if(i < 10){
anim[i].src = `images/anim/frame0${i}.png`;
}
if(i >= 10){
anim[i].src = `images/anim/frame${i}.png`;
}
}
Now you can do:
document.body.appendChild(anim[0]);
I tested this and it works for me.
If you want to change src on the fly then you'd have to select the appended element and update its src like this: document.querySelectorAll('img')[0].src = newSourceVariable;.

Inline Javascript in Wordpress

I'm have multiple tables and have an option dropdown that loops through them. When I tested the code in http://codepen.io/fernandob/pen/JEJRMW , it all works fine but when adding it in my Wordpress page, it doesn't run. In wordpress i'm using visual composer and in a text block, via the text editor i paste the html code, following this.
<script>
if (typeof suffixes !== "undefined") {
suffixes += ",1390152632";
} else {
suffixes = "1390152632";
}
function changeCurrency_1390152632() {
var idx = document.getElementById("id_selected_currency_1390152632").options.selectedIndex;
var currency = document.getElementById("id_selected_currency_1390152632").options[document.getElementById("id_selected_currency_1390152632").options.selectedIndex].value;
var currencies = ["EUR", "USD", "GBP"];
var i, j;
for (i = 0; i < 3; i++) {
var els = document.getElementsByClassName("currency_" + currencies[i]);
var cnt = els.length;
if (currency == currencies[i]) {
for (j = 0; j < cnt; j++) {
els[j].style.display = "block";
}
var a = suffixes.split(",");
for (j = 0; j < a.length; j++) {
document.getElementById("id_selected_currency_" + a[j]).options.selectedIndex = idx;
}
} else {
for (j = 0; j < cnt; j++) {
els[j].style.display = "none";
}
}
}
}
</script>

It's replace with html code because you are using text block.
Use RawHTML and RawJS elements under the structure tab using visual composer.
HTML code paste in the Raw HTML element and JavaScrip code paste in the Raw JS element.
See also image:
Hope this answer help you.

I'm trying to make a div width expand once clicking on another div

Im trying to make a div expanded once you click on another div. In my case I'm try to make div with some text in it expand when the image is clicked. A link to my JSFiddle - https://jsfiddle.net/txoyuvqn/3/
My javascript that I am using looks like.
var divs = document.getElementsByClassName('image');
var whattochange = document.getElementsByClassName('text');
for (var i = 0; i < divs.length; i++)
divs[i].addEventListener("click", function () {
for (var i = 0; i < whattochange.length; i++) {
whattochange[i].style.width = '500px'
whattochange[i].style.transition = 'all 1s'
whattochange[i].style.backgroundColor = 'red'
}
}, false);
However when I click on the class called image it effects all the Text classes, i know it's because were changing the css to all of the text divs, however is there a way to make it only effect the correlating div? Or am I going about creating this in the wrong way?

getElementsByClassName returns an array, not a single element.
divs is an array, and you are correctly using a for loop and the index indicator [i] after your variable name divs.
You need a similar for loop for whattochange.
var divs = document.getElementsByClassName('image');
var whattochange = document.getElementsByClassName('text');
for (var i = 0; i < divs.length; i++)
divs[i].addEventListener("click", function () {
for (var i = 0; i < whattochange.length; i++) {
whattochange[i].style.width = '800px';
whattochange[i].style.transition = 'all 1s';
whattochange[i].style.backgroundColor = 'red';
}
}, false);

There may be a better way, but you could do it like this:
var divs = document.getElementsByClassName('image');
var whattochange = document.getElementsByClassName('text');
for (var i = 0; i < divs.length; i++)
{
divs[i].addEventListener("click", function()
{
var w = document.getElementById(this.id.replace('img', 'text'));
w.style.width = '800px'
w.style.transition = 'all 1s'
w.style.backgroundColor = 'red'
});
whattochange[i].id = 'text' + i;
divs[i].id = 'img' + i;
}

See the fiddle
Javascript
var divs = document.getElementsByClassName('image');
var whattochange = document.getElementsByClassName('text');
for (var i = 0; i < divs.length; i++) {
divs[i].addEventListener("click", function () {
for (var i = 0; i < whattochange.length; i++) {
whattochange[i].style.width = '800px';
whattochange[i].style.transition = 'all 1s';
whattochange[i].style.backgroundColor = 'red';
}
}, false);
}
You have to be sure that the elements exist if your JavaScript code depends on them. The reason why your fiddle didnt work was because, you was not loading the script after the body has finished loading.
In your code, One way of achieving this is by putting the <script> tag at the end of the body like this:
<html>
<head></head>
<body>
<script type="text/javascript">
// code here
</script>
</body>
You can also put all your code in a function for the window.onload event or use jQuery.

javascript add relative path to all links dynamically

I'm trying to build a html file to prepend and replace string.
for example, if my url for css file,
<link href="/srsstore/store/-1/common/components/cbsassets/styles/iPhone.css" type="text/css" rel="stylesheet" />
And url for image file,
<img src="/s/store/-1/ProductizedWidgets/transparent.png" width="1px" height="1px"/>
Also, for background image
<div style="background-color: #e45600;background-image: url(/s/store/4812610/no_preview.gif);background-repeat:repeat-x;font-weight:bold;font-family:Helvetica, Arial, sans-serif; font-size:12px;color:#FFFFFF></div>
and I want to prepend "domain.com" to these urls. How do i search and replace a string dynamically using javascript.
The content is getting from this url:
http://euroleagueiphone.mo2do.net/s/31653/Home?ebbLinkIndex=0&backTitle=Home&iPhoneMode=app&debugRender=true&appVersion=2.2&engineVersion=1.3

You can try this:
window.onload = function() {
var domain = 'YOUR_DOMAIN';
// For images
var imgs = document.getElementsByTagName("img");
for (var i = 0; i < imgs.length; i++) {
imgs[i].setAttribute("src",domain + imgs[i].getAttribute("src"));
}
// For CSS files
var links = document.getElementsByTagName("link");
for (var i = 0; i < imgs.length; i++) {
links[i].setAttribute("href",domain + links[i].getAttribute("href"));
}
};
Edit:
For the divs add the following code to the above:
// For CSS files
var styleProp = 'background-image';
var divs = document.getElementsByTagName("div");
for (var i = 0; i < divs.length; i++) {
if(divs[i].currentStyle) {
divs[i].style['styleProp'] = domain + divs[i].currentStyle[styleProp];
} else if (window.getComputedStyle) {
divs[i].style['styleProp'] = domain + document.defaultView.getComputedStyle(divs[i],null)
.getPropertyValue(styleProp);
}
}
You can get help form Get Styles.

$("img").each(function(){
$e = $(this);
$e.attr("src","http://example.com" + $e.attr("src"));
})
$("link").each(function(){
$e = $(this);
$e.attr("href","http://example.com" + $e.attr("href"));
})
Use jquery

You need to find all the a's and img's in your code, loop through them, get the current attribute value (whether src or href), prepend your domain to it, and then set the attribute value. I haven't tested this, but this is the general idea:
var links = document.getElementsByTagName("a");
var images = document.getElementsByTagName("img");
for (i=0; i < links.length; i++) {
links[i].setAttribute("href","domain.com" + links[i].getAttribute("href"));
}
for (i=0; i < images.length; i++) {
images[i].setAttribute("src","domain.com" + images[i].getAttribute("src"));
}

How to hide a class using javascript?

I have text on a page, its in a <h3> tag, which has a class ms-standardheader, but there are other texts on the page with the same class in its own <h3> tag. I also know the text I want to hide is 'Session'.
With this how can I write a javascript function to hide only this text?
Here is an image of the developtools from IE.

I'd suggest, if you're restricted (as your tags suggest) to non-library plain JavaScript, the following:
var h3s = document.getElementsByTagName('h3'),
classedH3 = [];
for (var i = 0, len = h3s.length; i < len; i++) {
if (h3s[i].className.indexOf('ms-standardheader') > -1) {
classedH3.push(h3s[i]);
}
}
for (var i = 0, len = classedH3.length; i < len; i++) {
if (classedH3[i].firstChild.nodeValue == 'the text to hide'){
classedH3[i].style.display = 'none';
}
}​
JS Fiddle demo.
References:
push().
document.getElementsByTagName().
element.className.
node.nodeValue.
indexOf().

Can't you give the target element an ID? That would make things much more simple. Otherwise, you have to go through all <h3> elements until you find the one you want to hide:
var headings = document.getElementsByTagName("h3");
for(var i=0; i<headings.length; i++) {
var contentElement = headings[i].getElementsByTagName('nobr');
var content = "";
if(contentElement.length) {
content = contentElement[0].textContent ? contentElement[0].textContent : contentElement[0].innerText;
}
var content = contentElement.length ? contentElement[0].childNodes[0].nodeValue : '';
if(headings[i].className == 'ms-standardheader' && content == 'Session') {
headings[i].style.display = 'none';
}
}

you should try this :
window.onload = function()
{
getElementByClass('ms-standardheader');
}
window.getElementByClass = function(theClass){
var allHTMLTags=document.getElementsByTagName('*');
for (i=0; i<allHTMLTags.length; i++) {
if (allHTMLTags[i].className==theClass) {
var content = allHTMLTags[i].innerHTML;
var search = /session/;
if (search.test(content))
{
alert(search);
allHTMLTags[i].style.display='none';
}
}
}
}
See Demo : http://jsfiddle.net/3ETpf/18/

Always favour a unique Id where possible. If not possible then you have to manually traverse the DOM to find the elements you are looking for. Here's an example using getElementsByTagName().
var i, header, headers = document.getElementsByTagName('h3');
for (i = 0; i < headers.length; i += 1) {
header = headers[i];
if (header.className === 'ms-standardheader' &&
(header.textContent || header.innerText) === 'Session') {
header.style.display = 'none';
}
}
see: http://jsfiddle.net/whP5z/

If you have jquery you may type this :
$("h3.ms-standardheader:contains('Session')").hide();