Develop Reference

Is there a way to switch images src back to original after on.click src change event?

I'm a noob working my way to learn JavaScript on my own and using some resources but want to probe things on my own hence trying this thing but it's not working for some reason. Help is appreciated.
The object is to clarify some blurred images by swapping the source. The images are called zero.jpg/zeroblur.jpg, one.jpg/oneblur.jpg and so on... The page loads with blurred image sources until clicked on. I want to write code so that it goes back to original blurred source image after 5 secs.
P.S.: The code in comments is what I've tried to write on my own.
window.onload = init;
function init() {
var blurryPic = document.getElementsByTagName("img");
for (var i = 0; i < blurryPic.length; i++) {
blurryPic[i].onclick = clarify;
// setTimeout(resetPic, 5000);
}
}
function clarify(eventObj) {
var pic = eventObj.target;
var id = pic.id;
id = "images/" + id + ".jpg";
pic.src = id;
}
// function resetPic(eventObj) {
// var pic = eventObj.target;
// var id = pic.id;
// id = "images/" + id + "blur.jpg";
// pic.src = id;
// }

It's better with CSS: your image stays the same and you only toggle a class, the class making your image blur.
document.getElementById("clickImg").addEventListener("click", function() {
this.classList.toggle("blurImg")
})
.blurImg {
-webkit-filter: blur(5px); /* Safari 6.0 - 9.0 */
filter: blur(5px);
}
<img src="https://www.muralsticker.com/23751-thickbox/autocollants-en-vinyle-pour-enfants-spongebob-squarepants.jpg" id="clickImg">
If what you want is really to be able to reset the original image, I think it's better to stock it in a specific attribute, like this:
document.getElementById("reset").addEventListener("click", function() {
document.getElementById("clickImg").src = document.getElementById("clickImg").getAttribute('origSrc')
})
var imgs = [
'https://vignette.wikia.nocookie.net/spongebob/images/d/d7/SpongeBob_stock_art.png/revision/latest?cb=20190921125147',
'https://static.vecteezy.com/system/resources/previews/000/072/351/non_2x/spongebob-squarepants-vector.jpg',
'https://upload.wikimedia.org/wikipedia/en/c/c7/BattleForBikiniBottom.jpg'
]
document.getElementById("random").addEventListener("click", function() {
document.getElementById("clickImg").src = imgs[Math.floor(Math.random() * 3)]
})
<input type="button" value="RESET" id="reset" />
<input type="button" value="RANDOM" id="random" /><br/>
<img src="https://www.muralsticker.com/23751-thickbox/autocollants-en-vinyle-pour-enfants-spongebob-squarepants.jpg" origSrc="https://www.muralsticker.com/23751-thickbox/autocollants-en-vinyle-pour-enfants-spongebob-squarepants.jpg" id="clickImg">

I used an if statement for this to check if the first loaded image file was present or not. Then use the attribute src for the file. Here's an example.
#javascript
function magicChanger(){
var myImage = document.getElementById("emailImage")
if (myImage.getAttribute("src") == "first loaded image"){
myImage.setAttribute("src", "second image")
}
else{
myImage.setAttribute("src", "first loaded image")
}
}
#html element
<button id = "emailButton" onclick="magicChanger()">
<img id="emailImage" src="{% static 'GoEnigmaPics/emailIcon.png' %}" alt="email">
</button>

Thanks for all the answers! I wanted to get it done in JS only so CSS wouldn't work. Appreciate the answers and will definitely incorporate in future projects!
P. S. This is what got it done in the end.
window.onload = init;
function init() {
var blurryPics = document.getElementsByTagName("img");
for (var i = 0; i < blurryPics.length; i++) {
blurryPics[i].onclick = clarify;
}
function clarify(eventObj) {
var pic = eventObj.target;
var id = pic.id;
id = "images/" + id + ".jpg";
pic.src = id;
setTimeout(reBlur, 3000, pic);
}
function reBlur(eventObj) {
var pic = eventObj.target;
var id = pic.id;
id = "images/" + id + "blur.jpg";
pic.src = id;
}

Please try this code,To Is there a way to switch images src back to original after on.click src change event?
It switches back because by default, when you click a link, it follows the link and loads the page. In your case, you don't want that. You can prevent it either by doing e.preventDefault();
$(function() {
$('.menulink').click(function(){
$("#bg").attr('src',"img/picture1.jpg");
return false;
});
});
I hope this code will be useful.
Thank You.

How do I replace an item in an array with one that isn't in said array?

So I want to have one of the images in the array change to a question mark. Here's what I have so far.
var icons = new Array ();
icons [0] = { html: "Animals/Ape.png" };
icons [1] = { html: "Animals/Bat.png" };
icons [2] = { html: "Animals/Cow.png" };
icons [3] = { html: "Animals/Emu.png" };
icons [4] = { html: "Animals/Pig.png" };
icons [5] = { html: "Animals/Dog.png" };
icons [6] = { html: "Animals/Rat.png" };
icons [7] = { html: "Animals/Yak.png" };
icons [8] = { html: "Animals/Cat.png" };
function showBack()
{
document.getElementById('table').style.display = "none";
document.getElementById('tableblank').style.display = "block";
icons[0]="Animals/Q.png";
setTimeout(showFront,3000);
}
function showFront()
{
document.getElementById('table').style.display = "block";
document.getElementById('tableblank').style.display = "none";
document.getElementById('speech').style.display = "block";
document.getElementById('typewindow').style.display = "block";
}
I've tried a couple of solutions but I haven't been able to make any work. Thanks for the help :)

if you want to re-assign this object you may do it like that :
icons[0].html = "Animals/Q.png";

I would do something like this...
var icons = [ "Animals/Ape.png",
"Animals/Bat.png",
"Animals/Cow.png" ];
icons[1] = "Animals/Q.png";
document.write(icons[1]);
or if you want to keep an the url as an object...
var oIcons = [{ html:"Animals/Ape.png" },
{html:"Animals/Bat.png"},
{html:"Animals/Cow.png"}];
oIcons[2].html = "Animals/Q.png";
document.write(oIcons[2].html);
So basicly on show back you should have...
icons[0].html="Animals/Q.png";

Considering the code you posted in your comment:
<div id="containerGameplay">
<div id = "table">
<script>
for (i = 0; i < 9 ; i++) {
document.write ("<div class = 'tile'><img src='" + icons[i].html+ "'></div>");
}
</script>
</div>
You are running inline code on your page, which is executed as soon as the browser loads it. To change an image later, you'll need to create a reference to the element you want to change. The easiest way to do this is to give your elements IDs, which would change your code like so:
document.write("<div class='title'><img id='icon_" + i + "' src='" + icons[i].html+ "'></div>");
This will result in the first image (icon[0]) being applied to the element with the ID "icon_0", and so on for each image.
Later, when you want to change an image, you can get a reference to the correct element, and then change the src to that element:
elem = document.getElementById('icon_0');
elem.src = "Animals/Q.png";
Or, following what I believe you were trying to do originally, you can change the array, then set the new source (src):
icons[0].html = "Animals/Q.png";
document.getElementById('icon_0').src = icons[0].html;
They're both the same, but the second example is also storing the value in your array. Keep in mind that there is no automatic data-binding, so simply changing the array does not automatically update the image element.

Making dynamically added p elements clickable

I am trying to make the elements clickable. However on clicking any of the <p> elements there is no alert box saying "hello". Please could you look at my code and possibly point me in the right direction?
function createLink(text, parentElement) {
var a = document.createElement('p');
var linkText = document.createTextNode(text);
a.appendChild(linkText);
a.onclick = function(e) {
e.preventDefault();
alert("hello");
};
parentElement.appendChild(a);
var br = document.createElement('br');
parentElement.appendChild(br);
}
var txtFile8 = new XMLHttpRequest();
txtFile8.open("GET", "http://www.drakedesign.co.uk/mdmarketing/uploads/date.txt", true);
txtFile8.onreadystatechange = function() {
if (txtFile8.readyState === 4) { // Makes sure the document is ready to parse.
if ((txtFile8.status == 200) || (txtFile8.status == 0)) { // Makes sure it's found the file.
allText8 = txtFile8.responseText;
arrayOfLines8 = allText8.match(/[^\r\n]+/g);
for (i = 0; i < arrayOfLines8.length - 1; i++) {
createLink(arrayOfLines8[i], document.getElementById("previousResultsList"));
}
}
}
};
txtFile8.send(null);
The script parses a text file online:
http://www.drakedesign.co.uk/mdmarketing/uploads/date.txt
Which is updated weekly and has dates written in it like so:
19/04/16
12/04/16
...
My script separates the text document into each line and stores it as an array. A for loop is then used to show the dates on the screen in a column which looks like so:
The problem is that on clicking each date an alert box is not shown saying "hello" and there seems to be no response at all.
All help is greatly appreciated.

I solved the issue!!
The problem was that I had divs with opacity 0 that were overlaying my parentElement! sorry stupid mistake!

Javascript - swap image on click or rollover

I know how to do this in jquery but i am trying to do the below in pure old school javascript. Can someone help:
$(".thumbnail").click(function() {
$("#mainImage").attr("src", $(this).attr("src"));
});
My ultimate goal is to click on a thumbnail and have the main image change but I need to do it in javascript (no jquery). I know this sounds pretty simple but I cannot figure it out. thank you.

There are so many things that jQuery gives you automatically that it's difficult to give you an answer that will do everything that your jQuery code does. Here is a simple example that will find every image with a class of thumbnail and set its onclick property to an event handler that performs an image swap.
onload = function () {
var bigImg = document.getElementById("mainImage");
for (var i = 0; i < document.images.length; i++) {
var img = document.images[i];
if (/\bthumbnail\b/.test(img.className) {
img.onclick = thumbnailHandler;
}
}
function thumbnailHandler(e) {
bigImg.src = this.src;
}
};
If you don't have to support IE7, you can simplify it slightly by using document.querySelectorAll():
onload = function () {
var bigImg = document.getElementById("mainImage");
var thumbs = document.querySelectorAll(".thumbnail");
for (var i = 0; i < thumbs.length; i++) {
thumbs[i].onclick = thumbnailHandler;
}
function thumbnailHandler(e) {
bigImg.src = this.src;
}
};
As an aside, I don't understand why you are setting the source of the main image to be the source of the thumbnail. Are you loading the full image into the thumbnail? That can be a lot to download and can quickly increase the memory footprint of your page.

Event delegation is probably the easiest way:
function expandThumbnail(e) {
if(~(' ' + e.target.className + ' ').indexOf(' thumbnail ')) {
document.getElementById('mainImage').src = e.target.src;
}
}
if(document.addEventListener) {
document.addEventListener('click', expandThumbnail, false);
} else {
document.attachEvent('onclick', function() {
expandThumbnail({
target: event.srcElement
});
});
}

If I understand right, you have a thumbnail image displayed, let's say '1thumb.png', of an associated image, let's say '1.png', and when you click this thumbnail image you want to change the src attribute of a main image, let's say with id='mainimg', to show the '1.png' image associated to the thumbnail instead of whatever it's showing. I tried this and it works:
Inside your <header>:
<script type='text/javascript'>
function myHandler(source){
document.getElementById('mainimg').src=source;
}
</script>
...
Your thumbnail code:
<img src='1thumb.png' onclick="myHandler('1.png')"/>
or, for rollover triggering:
<img src='1thumb.png' onmouseover="myHandler('1.png')"/>
Check it out: http://jsfiddle.net/d7Q27/7/

How to change content of a div

I know this question has been asked before, but if someone could explain in greater detail it would be awesome. I have a div and a table and an image inside this div. I am making a image gallery, so I have two links forward and back, how do I make these links change the image, or rather all the content inside the div. I am very new to javascript, actually I know nothing at all about it, if I could get a step by step instruction that would be awesome, I have tried so of the other post codes but can not get it to work, so I have no idea what I am doing wrong.

Sample HTML:
<html>
<head><title>Dummy page</title></head>
<body>
<div id="divID">
<img id="backImg" src="http://test.com/sample.jpg">
</div>
</body>
</html>
To change the whole div:
var div = document.getElementByID('divID');
div.innerHTML = "<b>This is some html</b>";
To just change the image:
var img = document.getElementByID('backImg');
img.src = "http://www.host.com/image.jpg';

Here's a good example that I made that might help. Try it out -- http://jsfiddle.net/SuperBoi45/XMSGe/
Here's the code for a quick look:
HTML:
<button id="before">Previous</button>
<button id="next">Next</button>
<div id="imageGallery"></div>
JavaScript:
function $(id) {
return document.getElementById(id);
}
var foward = null,
back = null,
images = [
"http://www.toxel.com/wp-content/uploads/2009/04/conceptcar04.jpg",
"http://politicolnews.com/wp-content/uploads/2010/01/bill-gates-car.jpg",
"http://www.youthedesigner.com/wp-content/uploads/2008/05/car-wallpapers19.jpg",
"http://d2o7bfz2il9cb7.cloudfront.net/main-qimg-555c9ae9cfd364db5307b2e8d717a00d",
"http://d2o7bfz2il9cb7.cloudfront.net/main-qimg-01589fb639efec5433a3e30a8a8dd449",
"http://d2o7bfz2il9cb7.cloudfront.net/main-qimg-31f8cbd6627edc1ba9ef2828f3423fdf",
"http://d2o7bfz2il9cb7.cloudfront.net/main-qimg-0f47a0c2db85b5d7c134d41bcdc65b2e",
"http://d2o7bfz2il9cb7.cloudfront.net/main-qimg-739fd589778207e542a6e31873a24433",
"http://d2o7bfz2il9cb7.cloudfront.net/main-qimg-6056a5df58462ea4951a2b328243b7a2",
"http://d2o7bfz2il9cb7.cloudfront.net/main-qimg-59028363fc0f7d0ee7aa1ebc5e72713a",
"http://d2o7bfz2il9cb7.cloudfront.net/main-qimg-eb09864be7a1fbe7e821bc1ee08c3a8b",
"http://d2o7bfz2il9cb7.cloudfront.net/main-qimg-50bd88090e05a452bba67d510ba4a0cc",
"http://d2o7bfz2il9cb7.cloudfront.net/main-qimg-191b37eea296e90a242d24db90824c5c"
];
var img = new Image();
for (var i = 0; i < images.length; i++) { // caching the images for performance boost
img.src = images[i];
}
var image = {
count: -1,
next: function() {
if (image.count == (images.length) - 1) return false;
image.count += 1;
$('imageGallery').innerHTML = "<img src=\"" + images[image.count] + "\"\/>";
},
previous: function() {
if (image.count <= 0) return false;
image.count -= 1;
$('imageGallery').innerHTML = "<img src=\"" + images[image.count] + "\"\/>";
}
};
foward = image.next;
back = image.previous;
$('next').addEventListener("click", foward);
$('before').addEventListener("click", back);
The best thing about this is that all you have to do is add a new image URL to the array and it will still work.
If you want to change the images but not all the content in the div, I'd recommend putting in another div outside the image gallery.