Develop Reference

How to use onclick event in JavaScript?

I'm trying to make a window that slide up when the X button(close.png) is clicked.
I added the Wrap element with JavaScript, and added an img element inside.
Then, I put following JavaScript, but there is no change when I press the X button.
<script>
const parent3 = document.querySelector('#wrap');
const billingField3 = document.querySelector('#woocommerce-input-wrapper');
const newImg = document.createElement('img');
newImg.setAttribute("src", "//t1.daumcdn.net/postcode/resource/images/close.png");
newImg.setAttribute('id', 'btnFoldWrap');
newImg.style.cssText = 'cursor:pointer;position:absolute;right:0px;top:-1px;z-index:1';
newImg.onclick = "offDaumZipAddress();"
parent3.insertBefore(newImg, billingField3);
</script>
function offDaumZipAddress() {
jQuery("#wrap").slideUp();
}
Website structure is
<div class="woocommerce-billing-fields__field-wrapper">
<p class="billing_postcode_find_field">..
<span class="woocommerce-input-wrapper">...
</span>
</p>
<div id="wrap" ..>
<img src="..."></img>
</div>
<p class="billing_address_1_field">
<span class="woocommerce-input-wrapper">
Checking with the console of chrome developer tools doesn't show any errors.
Could someone please let me know what am I missing?
Thank you.

The value of the onclick property must be a function reference, not a JavaScript string.
newImg.onclick = offDaumZipAddress;

You have your answer; here is a working example of that loosely based on your code (so the inserted image actually shows, added some CSS etc. to illustrate)
//gets first one of this type
const billingField3 = document.querySelector('.woocommerce-input-wrapper');
// Get a reference to the parent node/ gets first one of this type
const parent3 = billingField3.parentNode;
//console.log(parent3);
//console.log(billingField3);
// Create the new node to insert
const newImg = document.createElement('img');
newImg.setAttribute("src", "//t1.daumcdn.net/postcode/resource/images/close.png");
newImg.setAttribute('id', 'btnFoldWrap');
newImg.setAttribute('alt', 'folderWrap');
// no not this: newImg.style.cssText = 'cursor:pointer;position:absolute;right:0px;top:-1px;z-index:1';
// this:
newImg.classList.add("inserted-image");
newImg.onclick = offDaumZipAddress;
//console.log("Thing:",newImg);
//console.log("HTML:", parent3.innerHTML);
parent3.insertBefore(newImg, billingField3);
//console.log("New HTML:", parent3.innerHTML);
function offDaumZipAddress() {
console.log('here we go');
jQuery("#wrap").slideUp();
}
.billing_postcode_find_field {
border: solid blue 1px;
padding: 1rem;
}
.woocommerce-input-wrapper {
border: solid 1px lime;
padding: 1rem;
}
.inserted-image {
cursor: pointer;
/* This is odd, makes it not clickable:
position: absolute;
right: 0px;
top: -1px;
z-index: 1;*/
border: solid 1px red;
min-width: 1.5rem;
min-height: 1.5rem;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="woocommerce-billing-fields__field-wrapper">
<p class="billing_postcode_find_field">..
<span class="woocommerce-input-wrapper">...</span>
</p>
<div id="wrap">
<img src="//t1.daumcdn.net/postcode/resource/images/close.png" alt="png"></img>
</div>
<p class="billing_address_1_field">
<span class="woocommerce-input-wrapper"></span>
</div>

How do I change the source of an image via JavaScript?

So, right now, I have this code, which has an upvote and downvote image (img/upvote.png and img/downvote.png) and when they are clicked, they should change source to img/orangeupvote.png, and downvote to orangedownvote.png (which are also both images in the img folder directory). So, for this I have this code:
<div style="position: fixed; margin-left: 1030px; margin-top: 235px">
<img class="textupvote" id="textUpvoteImg" src="img/upvote.png" alt="upvote" onclick="changetextUpvote()" style="width: 100px; margin-bottom: 28px; cursor: pointer">
<img class="textdownvote" id="textDownvoteImg" src="img/downvote.png" alt="downvote" onclick="changetextDownvote()" style="width: 120px; margin-top: -12px; position: fixed; cursor: pointer">
</div>
<script type="text/javascript">
function changetextUpvote() {
var textUpvoteImg = document.getElementById('textUpvoteImg');
if (textUpvoteImg.src.match("orangedownvote")) {
textUpvoteImg.src = "img/upvote.png";
} else {
textUpvoteImg.src = "img/orangedownvote.png";
}
}
function changetextDownvote() {
var textDownvoteImg = document.getElementById('textDownvoteImg');
if (textDownvoteImg.src.match("orangeupvote")) {
textDownvoteImg.src = "img/downvote.png";
} else {
textDownvoteImg.src = "img/orangeupvote.png";
}
}
</script>
So, when I try this out on a different document, it's working. The upvote and downvote images are both successfully changing to the orange versions of them (orangeupvote.png and orangedownvote.png), on click. However, when I try this on my current document, it isn't working. I even inspected, and on click, it isn't changing source, but then for any other image (anything which isn't orangeupvote.png or orangedownvote.png) is working. If is specify any other image on click, it's working, but orangeupvote.png and orangedownvote.png aren't working.
EDIT:
When I click the upvote button, it shows both orange downvote and upvote at the same time. This shouldn't happen. It should only show orange downvote. (Actually orange upvote, but I'm doing this to test). Similarly, with the downvote button, when clicked it should show only orange upvote, but it shows orange upvote and downvote at the same time. Here's an image for more clarity:
Image on what's occurring:

In order to write modern JavaScript you should define the Event-Listeners with addEventLisener:
Also, you should not pass a function call to onclick Attribute, but only the function reference, which should be executed on click.
Correct: onclick="changetextUpvote"
I'm not sure, whether the if-statements inside the Click-Handler do what they should..Maybe, I'd rather use String.prototype.includes instead of match (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes).
EDIT: Eventlisteners do not check the current img source. They just change the src to the desired image/png after click.
<div style="position: fixed; margin-left: 1030px; margin-top: 235px">
<img class="textupvote" id="textUpvoteImg" src="img/upvote.png" alt="upvote" style="width: 100px; margin-bottom: 28px; cursor: pointer">
<img class="textdownvote" id="textDownvoteImg" src="img/downvote.png" alt="downvote" style="width: 120px; margin-top: -12px; position: fixed; cursor: pointer">
</div>
<script type="text/javascript">
var textUpvoteImg = document.getElementById('textUpvoteImg');
var textDownvoteImg = document.getElementById('textDownvoteImg');
function changetextUpvote() {
// removed if-else statement here
textUpvoteImg.src = "img/orangedownvote.png";
}
function changetextDownvote() {
// removed if-else statement here
textDownvoteImg.src = "img/orangeupvote.png";
}
// Only pass the function name, not the function call (e.g. not changetextUpvote())
textUpvoteImg.addEventListener('click', changetextUpvote);
textDownvoteImg.addEventListener('click', changetextDownvote);
</script>

What is the appropriate way to add a click event in place of a hover event added to pictures in an org chart?

I have been tasked to take some pre-existing code which has a float event on an org chart. When you hover over an individual on the org chart a picture pops up and displays all the employees under them.
They don't like that and would like it changed to a click event. I've listed the code for the float event but what would be an example of taking the contentFloating and making it a click event? Looking for the proper syntax please.
}
.orgContainer .contentStable .contentFloating img {
height: 720px;
width: 960px;
}
/* Float content */
.orgContainer .contentFloating {
border: 2px solid black;
display: none;
position: fixed;
}
.orgContainer .contentStable:hover .contentFloating {
display: block;
top: 7%;
left: 15%;
}
<div class="contentStable">
<img title="Scott Plemmons Director Supplier Quality Compliance" src="/sites/scm/utas_supp_qual/Home_Pictures/scott_plemmons.jpg" />
<p>
Scott Plemmons<br/> Director
<br/> Supplier Quality
</p>
<div class="contentFloating">
<img src="/sites/scm/utas_supp_qual/Home_Pictures/Org_Charts/Scott_Plemmons_Chart.jpg" />
</div>
</div>

This is an example of how to add a click event handler to a dom element, and then make another div appear when you click on it.
html
<div class="orgchart">click for details</div>
<div id="details">details</div>
css
#details {
position:absolute;
}
javascript
let elements = document.getElementsByClassName("orgchart");
for(var i = 0; i < elements.length; i++)
{
elements[i].addEventListener("click", function(e){
// get the position of the element that was clicked
let clickedItem = e.target;
var rect = clickedItem.getBoundingClientRect();
// set the details div to that position and fill it with content
let details = document.getElementById("details");
details.innerHTML = "Joe Average";
details.style.left = (rect.left + 10) + "px";
details.style.top = (rect.top + 20) + "px";
});
}
Check a jsfiddle example here

Select the last two items of a parent element, add class and apply changes to both of them->not working

This jsfiddle example can explain more or less what I mean
Click here
This is my actual code
JS
loadMore : function(){
var limit = initial_rows+1; //initial_rows begin being 2
var number_of_rows_to_append = initial_rows+2; // 4
$card.css('height', $card.find('.title-box').height() + number_of_rows_to_append * 70); //update card height
for(var i = initial_rows; i<=limit; i++){
$(template(content[i])).appendTo($contentJQuery);
}
$contentJQuery.find('.normal-box').slice(-2).addClass('show');
initial_rows+=2;
}
},
CSS
.normal-box{ /*Container of other tiny boxes*/
height: 70px;
border-bottom: 1px solid;
border-bottom-color: gainsboro;
overflow: hidden;
opacity: 0;
transition: opacity 0.5s ease 0.5s;
}
.normal-box.show{
opacity: 1;
}
HTML
<div class="card">
<div class="content">
<div class="normal-box">
</div>
<div class="normal-box">
</div>
<div class="normal-box">
</div>
<div class="normal-box">
</div>
</div>
</div>
Basically there is a function which creates the card and appends only 2 normal-boxes at the beginning(there opacity is set to 1 automatically). When loadMore() function is triggered 2 more rows have to be appended with the opacity transition as shown in the jsfiddle example(in my case the rows appear, in the jsfiddle they disappear). The transition consists in the card getting bigger(thats why card height gets updated) with a blank space, then the 2 last normal-boxes appear with transition
The problem is that in my case the last row appears without transition and the penultimate appears with transition, no idea why. Any help will be appreciated

Updated Fiddle:
Perhaps this is what you intended:
revised jsFiddle
$('.btn').on('click', function(){
$('li').each(function(){
var txt = $(this).text().slice(0,-2); //or .slice(-1) ?
$(this).text(txt).addClass('change');
});
});

How to use Jquery to remove an overflowing element?

Pretty simple problem, but I can't find a solution. This plugin claims to do it, but I can't get it to work on my site at all, not as a called script, not inline, nothing. So, I have two columns of divs, the ones on one side larger than the other. I have set it up so the second column container will match the height of the first (which is determined elsewhere and thus varies) and set it to overflow:hidden, but what I want to do do is to remove the overflowing divs entirely so it always ends on the last complete div. Here's the fiddle: https://jsfiddle.net/bw2v39ru/2/
This is the JS to equalize the heights $('.row2').css('height', $('.row1').height()+'px');
In that example, only two of he block2 spans should be visible and the overflowing ones removed completely instead of leaving half a block.

Try this: https://jsfiddle.net/bw2v39ru/9/
Besides the code below - you will have to e.g. insert a <br style="clear:both;" /> in the parent DIV since the children has float: left
$('.row2').css('height', $('.row1').height());
var maxHeight = $("#main").outerHeight();
$("#main span").each(function() {
var elm = $(this);
if (elm.offset().top + elm.height() > maxHeight)
elm.remove();
});

as promised, here is my answer. Custom build jsfiddle from pure JavaScript.
https://jsfiddle.net/www139/vjgnsrpg/
Here is a code snippit for you. It assumes that all of your block2 elements have a fixed height. Also I changed the .row1 and .row2 classes to ids to make the solution easier to create. Feel free to change it back but remember to use document.getElementsByClassName('class')[i] instead.
//make sure you execute this script onload inside a jquery document ready or window.onload
//get the rendered height of both rows
//enter margin for blocks here
//this also assumes that the height of your block1 and block2 elements are fixed
var margin = 5;
var rowOneHeight = document.getElementById('row1').offsetHeight;
//get height of block2 element including vertical margin (multiplied twice)
var blockTwoHeight = document.getElementById('row2').getElementsByClassName('block2')[0].offsetHeight + 2 * margin;
var howManyBlocksCanFit = Math.floor(rowOneHeight / blockTwoHeight);
var numberOfBlocks = document.getElementById('row2').getElementsByClassName('block2').length;
for (var i = 0; i != numberOfBlocks - howManyBlocksCanFit; i++) {
document.getElementById('row2').removeChild(document.getElementById('row2').lastElementChild);
}
#main {
width: 240px;
}
#row1 {
float: left;
}
#row2 {
float: right;
overflow: hidden;
}
.block1 {
display: block;
margin: 5px;
width: 100px;
height: 50px;
border: 1px solid red;
}
.block2 {
display: block;
margin: 5px;
width: 100px;
height: 100px;
border: 1px solid red;
}
<div id="main">
<div id="row1">
<span class="block1"></span>
<span class="block1"></span>
<span class="block1"></span>
<span class="block1"></span>
<span class="block1"></span>
</div>
<div id="row2">
<span class="block2"></span>
<span class="block2"></span>
<span class="block2"></span>
<span class="block2"></span>
<span class="block2"></span>
</div>
</div>
Hope this helps you, please tell me if there was something I didn't understand in your question to improve my answer.

I programmed it for you, this works after your existing JS code line:
var row2 = $('div.row2'),
block2elements = row2.children('span.block2');
// Function to use also for other situations
function calculateElementsHeight(elements) {
var height = 0;
$.each(elements, function(i, elementRaw ){
height += $(elementRaw).height();
})
return height;
}
for(var i = 0; block2elements.length > i; i++) {
block2elements = row2.children('span.block2'); // Get new state of the block2 elements
if(row2.height() < calculateElementsHeight(block2elements)) {
block2elements.last().remove();
}
}