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Swap as image positions with drag and drop

I have the following script that I put together with part of another, what I need is to change the images by dragging the red heart to the blue one, the blue takes the place of the red and vice versa.
Today the trawler wipes out the old ones.
<div id="div1" ondrop="drop(event)" ondragover="allowDrop(event)">
<img id="drag2"
src="http://icons.iconarchive.com/icons/mirella-gabriele/valentine/256/Heart-red-icon.png"
draggable="true" ondragstart="drag(event)" width="50px">
</div>
<div id="div2" ondrop="drop(event)" ondragover="allowDrop(event)">
<img id="drag1"
src="http://icons.iconarchive.com/icons/mirella-gabriele/valentine/256/Heart-blue-icon.png"
draggable="true" ondragstart="drag(event)" width="50px">
</div>
Javascript:
function allowDrop(ev) {
ev.preventDefault();
}
function drag(ev) {
ev.dataTransfer.setData("Text", ev.target.id);
}
function drop(ev) {
ev.preventDefault();
var data = ev.dataTransfer.getData("Text");
ev.target.appendChild(document.getElementById(data));
}

function allowDrop(ev) {
ev.preventDefault();
}
function drag(ev) {
ev.dataTransfer.setData("text", ev.target.id);
}
function drop(ev) {
ev.preventDefault();
var id = ev.dataTransfer.getData("text");
var element = document.getElementById(id)
var div = document.getElementById(id).parentNode;
var clonedHeart = document.getElementById(ev.target.id).cloneNode(true);
ev.target.parentNode.insertBefore(element, ev.target.id.nextSibling)
document.getElementById(ev.target.id).remove();
div.appendChild(clonedHeart);
ev.dataTransfer.clearData();
}
I hope this help you.

display next image on drop

I have three div boxes with id 10, 11, 12. I have an image array, on dropping an item box, the box element gets deleted, I make a call to function nextslide in the on-drop method which calls next slide to display.
On dropping the first element on any box with id 10, 11, 12 The box gets deleted, but displaying next image through nextslide() method doesn't work.
I want to display next image in an array on successfully dropping the first element.
How to achieve this?
function allowDrop(ev) {
ev.preventDefault();
}
function drag(ev) {
ev.dataTransfer.setData("Text", ev.target.id);
}
var x = document.get
function drop(ev) {
ev.preventDefault();
var data = ev.dataTransfer.getData("Text");
alert(data);
var el = document.getElementById(data);
el.parentNode.removeChild(el); // deleting drag item
ev.target.style.backgroundColor = 'initial'; //[value indicate which box elemenet] bgcoclor none
nextslide();
}
var images = new Array();
images[0] = "https://picsum.photos/200/300/?random";
images[1] = "https://picsum.photos/200/300/?random";
images[2] = "https://picsum.photos/200/300/?random";
var currentpic = 0;
var lastpic = images.length - 1;
function nextslide() {
if (currentpic == lastpic) {
currentpic = 0;
document.getElementById('slide').src = images[currentpic];
} else {
currentpic++;
document.getElementById('slide').src = images[currentpic];
}
}
.box {
background-color: coral;
width: 20%;
height: 60px;
display: inline-block;
border-radius: 5px;
margin: -2px;
border-radius: 12%;
background-color: #00b300;
}
<div id="container">
<div class="box" ondrop="drop(event)" ondragover="allowDrop(event)" id="10">
<p name="values"></p>
</div>
<div class="box" ondrop="drop(event)" ondragover="allowDrop(event)" id="11">
<p name="values"></p>
</div>
<div class="box" ondrop="drop(event)" ondragover="allowDrop(event)" id="12">
<p name="values"></p>
</div>
</div>
<div class="box2" draggable="true" ondragstart="drag(event)" id="2">
<img src="https://picsum.photos/200/300/?random" draggable="true" id="slide" style="width:30px; height:100px; border-radius: 50%;" border="rounded" onclick="nextslide()" />
</div>

Javascript / html5 drag n drop counting

Ok I have 7 colour block in which to drag 7 colour names. If the user get the correct colour name in the right colour block they receive a point. This is my code below but my count is not working when the user gets the correct answer. Can anyone help please, I know it is something stupid I'm not seeing.
function readDropZone() {
var score = document.getElementById('score');
score.innerHTML = 0;
var block = document.getElementById('colour-block').children;
for(var i = 0; i < block.length; ++i) {
var hitblock = block[i];
var dropzone = hitblock.lastElementChild;
if (dropzone.children.length > 0) {
var dropzoneId = dropzone.id;
var blockId = dropzone.firstElementChild.id;
var blockNo = dropzoneId.substring(dropzoneId.indexOf('-') + 1);
var dragNo = blockId.substring(blockId.indexOf('-') + 1);
if (dragNo == blockNo) {
score.innerHTML = parseInt(score.innerHTML) + 1;
}
}
if (parseInt(score.innerHTML) == 10) {
alert('Congratulations! You won the game!\nClick OK to restart.');
location.reload();
}
}
}
function allowDrop(ev) {
ev.preventDefault();
}
function drag(ev) {
ev.dataTransfer.setData("text", ev.target.id);
}
function drop(ev) {
ev.preventDefault();
readDropZone();
const data = ev.dataTransfer.getData("text");
ev.target.appendChild(document.getElementById(data));
}
#block-1, #block-2, #block-3, #block-4, #block-5, #block-6, #block-7 {
color: #fff;
width: 150px;
height: 35px;
border: 1px solid #aaaaaa;
text-align: center;
padding: 10px 0;
font-size: 1.25em;
}
#block-3 {
color: #000;
}
#colour-block {
float: left;
width: 50%;
}
#colour-name {
float: right;
line-height: 1.5em;
font-size: 1.25em;
font-weight: bold;
width: 50%;
clear: right;
cursor: move;
}
<h2>1. Drag and drop the names into the coloured blocks</h2>
<div id="colour-block">
<div id="block-1" class="block" style="background-color:red" ondrop="drop(event)" ondragover="allowDrop(event)" name="red"></div>
<div id="block-2" class="block" style="background-color:orangered" ondrop="drop(event)" ondragover="allowDrop(event)" name="orange" ></div>
<div id="block-3" class="block" style="background-color:yellow" ondrop="drop(event)" ondragover="allowDrop(event)" name="yellow"></div>
<div id="block-4" class="block" style="background-color:green" ondrop="drop(event)" ondragover="allowDrop(event)" name="green"></div>
<div id="block-5" class="block" style="background-color:skyblue" ondrop="drop(event)" ondragover="allowDrop(event)" name="blue"></div>
<div id="block-6" class="block" style="background-color:midnightblue" ondrop="drop(event)" ondragover="allowDrop(event)" name="indego"></div>
<div id="block-7" class="block" style="background-color:rgb(109, 92, 221)" ondrop="drop(event)" ondragover="allowDrop(event)" name="violet"></div>
</div>
<div id="colour-name">
<div id="drag-6" class="colour" draggable="true" ondragstart="drag(event)" name="indego">Indeagó</div>
<div id="drag-2" class="colour" draggable="true" ondragstart="drag(event)" name="orange">Oráiste</div>
<div id="drag-4" class="colour" draggable="true" ondragstart="drag(event)" name="green">Glas</div>
<div id="drag-3" class="colour" draggable="true" ondragstart="drag(event)" name="yellow">Buí</div>
<div id="drag-1" class="colour" draggable="true" ondragstart="drag(event)" name="red">Dearg</div>
<div id="drag-7" class="colour" draggable="true" ondragstart="drag(event)" name="violet">Corcairghorm</div>
<div id="drag-5" class="colour" draggable="true" ondragstart="drag(event)" name="blue">Gorm</div>
</div>
<div style="clear:both"></div>
<h1>Your score is <span id="score">0</span> out of 7</h1>
</div>

As several others have stated, your blockResults function is not being invoked. Once it is being invoked there are 2 errors that are preventing count from incrementing properly:
dropzone will never have children. You already check for the presense of children in this line: var dropzone = hitblock.lastElementChild; So I changed the if statement to just if (dropzone) {
The line var blockId = dropzone.firstElementChild.id; was a bit confusing to me as you are trying to get the id of the block but you are looking at the child's Id which is not present. I changed the line to var blockId = hitblock.id;
The counter begun incrementing after these two changes.

Ondrop function. Help me complete my function.

I am trying to make a feature of my website where there are multiple pictures and you have to drag an icon ( Turtle ) into a box. I managed to find some codes for what happen if you drag the correct icon.
function allowDrop(ev) {
ev.preventDefault();
}
function drag(ev) {
ev.dataTransfer.setData("text", ev.target.id);
}
function drop(ev) {
ev.preventDefault();
var data = ev.dataTransfer.getData("text");
ev.target.appendChild(document.getElementById(data));
window.location.assign("homepage.html");
}
<div id="div1" ondrop="drop(event)" ondragover="allowDrop(event)"></div>
<img id="drag1" src="turtle.ico" draggable="true" ondragstart="drag(event)"
width="100" height="100">
<img draggable="true" width="100" height="100" src="fish.ico">
I am now having trouble of writing the code for what happen if you drag the wrong icon (fish.ico) . I am planning for it to have a prompt, saying "Try again" but can't find out how to do it. Can someone help me create of function to do that?

If you have a proper id setup per image you can check if the data in the drop event is turtle.
See below.
function allowDrop(ev) {
ev.preventDefault();
}
function drag(ev) {
ev.dataTransfer.setData("text", ev.target.id);
}
function drop(ev) {
ev.preventDefault();
var data = ev.dataTransfer.getData("text");
if (data !== "turtle") {
alert("Try again!");
return;
}
var img = document.getElementById(data);
ev.target.appendChild(img);
}
<div id="div1" ondrop="drop(event)" ondragover="allowDrop(event)">
drop here
</div>
<img id="turtle" src="turtle.ico" draggable="true" ondragstart="drag(event)" width="100" height="100" />
<img id="fish" src="fish.ico" draggable="true" ondragstart="drag(event)" width="100" height="100" />

drag and drop text exercise

I am making an exercise in which text id drag from div(contain words) then drop them into text-fields (these are 3)..Each field has its own text to be placed .. I have already drag and drop the text but cant able to compare them for particular fields .. Please help me.. Here is my code :
<!DOCTYPE HTML>
<html>
<head>
<style type="text/css">
#div1 {width:350px;height:70px;padding:10px;border:1px solid #aaaaaa;}
#div2 {width:350px;height:70px;padding:10px;border:1px solid #aaaaaa;}
#div3 {width:350px;height:70px;padding:10px;border:1px solid #aaaaaa;}
</style>
<script>
function allowDrop(ev)
{
ev.preventDefault();
}
function drag(ev)
{
ev.dataTransfer.setData("Text",ev.target.id);
}
function drop(ev)
{
ev.preventDefault();
var data=ev.dataTransfer.getData("Text");
ev.target.appendChild(document.getElementById(data));
}
</script>
</head>
<body>
verbs
<div id="div1" ondrop="drop(event)" ondragover="allowDrop(event)"></div>
<br>
noun
<div id="div3" ondrop="drop(event)" ondragover="allowDrop(event)"></div>
<br>
adjetives
<div id="div2" ondrop="drop(event)" ondragover="allowDrop(event)"></div>
<br>
<div id="drag1" draggable="true" ondragstart="drag(event)">I play the guitar</div>
<div id="drag2" draggable="true" ondragstart="drag(event)">The piano is black</div>
</body>
</html>

There are a couple of things you need to change here.
You need to drag words and not sentences
<div id="drag1">I
<span id="play" draggable="true" ondragstart="drag(event)"><b>play</b></span> the
<span id="guitar" draggable="true" ondragstart="drag(event)"><b>guitar</b></span>
</div>
There should be some list containing the allowed words for each type
var nouns = ['guitar'];
var verbs = ['play'];
Finally there should be a condition during drop event
function drop(ev) {
ev.preventDefault();
var data = ev.dataTransfer.getData("Text");
if(ev.target.id =='verb' && verbs.indexOf(data) != -1){
ev.target.appendChild(document.getElementById(data));
}
else{
alert(data + ' is not a ' + ev.target.id +'. Try again');
}
}
Here is a demo for a single sentence