I need to figure out how to incorporate a specific feature into my personal list by leveraging Javascript

Question

I need to figure out how to incorporate a specific feature into my personal list by leveraging Javascript

Looking at the list below, it's a simple one that allows users to add and remove items while also changing their order using buttons. However, I want to enhance this feature by removing the "up" button for the first item and the "down" button for the last item. Initially, everything might seem fine, but in reality, I only took 4 lines of code to make these changes which led to issues when users modified or added new items. I'm sure there are smarter ways to implement this, but I've personally tried an approach that I can't seem to get working after spending over 2 hours on it.

My idea:

FIRST PART: Creating functions to remove the "up" button from the second li and moving it to the first li. Also, removing the "down" button from the penultimate li and relocating it to the last li.

function upButtonFixer (li1,li2){

var up = document.createElement("BUTTON");
up.className = "up"
up.textContent="up"
li1.appendChild(up); 

var upper = li2.getElementsByClassName('up')[0];
li2.removeChild(upper);
}


 function downButtonFixer (li1,li2){

 var down = document.createElement("BUTTON");
 down.className = "down"
 down.textContent="down" 
 li2.appendChild(down);

 var downer = li1.getElementsByClassName('down')[0];
 li1.removeChild(downer);
 }

SECOND PART : Then I called both functions within an if statement as shown below:

ul.addEventListener('click',(event)=>{

if (event.target.tagName == "BUTTON"){
        if (event.target.className=="up"){

            **if (prevLi == ul.firstElementChild)
                  upAdderRemover(prevLi,li);**     
          }

        if (event.target.className=="down"){

               **if (li==ul.lastElementChild) 
                   downAdderRemover(li,nextLi);**


          } 
            }

... (The remaining HTML, CSS, and JavaScript code has been omitted for brevity) ...

javascript jquery html css

Answer 1

Answer №1

After dedicating 4 hours to the problem, I finally found a solution using javascript, although it may not be the most efficient one. But nonetheless, I'm thrilled that it's now implemented and working! 😊

A big shoutout to those who provided their creative CSS solutions. Feel free to check it out.

Without further ado, here are the details:

const toggleList = document.getElementById('toggle');
const listDiv = document.querySelector("div");
const inputDescription = document.querySelector("input.description");
const pDescription = document.querySelector('p.description');
const buttonDescription = document.querySelector('button.description');
const addItemList = document.querySelector('button.adder');
const addInput = document.getElementsByClassName('addInput')[0];
const ul = document.querySelector('ul');
const removeButton = document.querySelector('button.remover');
const lis = ul.children;

// Function to add buttons
function addButtons (li){

    let up = document.createElement("BUTTON");
    up.className = "up"
    up.textContent="up"
    li.appendChild(up);
    
    let down = document.createElement("BUTTON");
    down.className = "down"
    down.textContent="down"
    li.appendChild(down);
    
    let remove = document.createElement("BUTTON");
    remove.className = "remove"
    remove.textContent="remove"
    li.appendChild(remove);
}

for (var i = 0 ; i<lis.length ;i++){
    
    addButtons(lis[i]);
}

// More functions and event listeners follow...

@import 'https://fonts.googleapis.com/css?family=Lato:400,700';

/* CSS styles go here */

<!DOCTYPE html>
<html>
    <head>
        <title>My First Website</title>
        <link rel="stylesheet" href="style.css">
    </head>
    <body>
        <h2>Im the H2!</h2>
        <p>Im the p!</p>
        <button id="toggle">Hide list!</button> 
        <div class="list">
            <p class="description">The title of the list</p>
            <input type="text" class="description">
            <button class="description">change the title!</button>
            <ul>
                <li>first </li>
                <li>second</li>
                <li>third</li>
                <li>forth</li>
                <li>fifth</li>
                <li>sixth</li>
                <li>seventh</li>
            </ul>
            <input type="text" class="addInput">
            <button class="adder">Add!</button>
            <button class="remover">Remove!</button>
        </div>
        <script src="app.js"></script>
    </body>  
</html>

Answer 2

After dedicating 4 hours to the problem, I finally found a solution using javascript, although it may not be the most efficient one. But nonetheless, I'm thrilled that it's now implemented and working! 😊

A big shoutout to those who provided their creative CSS solutions. Feel free to check it out.

Without further ado, here are the details:

const toggleList = document.getElementById('toggle');
const listDiv = document.querySelector("div");
const inputDescription = document.querySelector("input.description");
const pDescription = document.querySelector('p.description');
const buttonDescription = document.querySelector('button.description');
const addItemList = document.querySelector('button.adder');
const addInput = document.getElementsByClassName('addInput')[0];
const ul = document.querySelector('ul');
const removeButton = document.querySelector('button.remover');
const lis = ul.children;

// Function to add buttons
function addButtons (li){

    let up = document.createElement("BUTTON");
    up.className = "up"
    up.textContent="up"
    li.appendChild(up);
    
    let down = document.createElement("BUTTON");
    down.className = "down"
    down.textContent="down"
    li.appendChild(down);
    
    let remove = document.createElement("BUTTON");
    remove.className = "remove"
    remove.textContent="remove"
    li.appendChild(remove);
}

for (var i = 0 ; i<lis.length ;i++){
    
    addButtons(lis[i]);
}

// More functions and event listeners follow...

@import 'https://fonts.googleapis.com/css?family=Lato:400,700';

/* CSS styles go here */

<!DOCTYPE html>
<html>
    <head>
        <title>My First Website</title>
        <link rel="stylesheet" href="style.css">
    </head>
    <body>
        <h2>Im the H2!</h2>
        <p>Im the p!</p>
        <button id="toggle">Hide list!</button> 
        <div class="list">
            <p class="description">The title of the list</p>
            <input type="text" class="description">
            <button class="description">change the title!</button>
            <ul>
                <li>first </li>
                <li>second</li>
                <li>third</li>
                <li>forth</li>
                <li>fifth</li>
                <li>sixth</li>
                <li>seventh</li>
            </ul>
            <input type="text" class="addInput">
            <button class="adder">Add!</button>
            <button class="remover">Remove!</button>
        </div>
        <script src="app.js"></script>
    </body>  
</html>

Answer 3

Answer №2

To achieve this effect, you can utilize CSS. Upon implementation, I observed that the initial set of buttons has shifted to the left, but overall, it fulfills your requirements.

Feel free to experiment with the CSS to rectify any minor issues that may arise.

To suppress the JavaScript function responsible for removing the first up and last down button, I opted to conceal these buttons using CSS instead by including the following code snippet:

ul li:first-child .up{ 
    display:none;
}
ul li:last-child .down{ 
    display:none;
}

If you require further clarifications on the changes I've applied, please don’t hesitate to leave a comment below, and I'll address them promptly.

I trust this information proves beneficial. Happy coding!

Edit: Rectified button alignment issue

If you seek a quick resolution for the button positioning problem, consider replacing the CSS with the revised code snippet provided below:

ul li:first-child .up{ 
    visibility:hidden;
}

Answer 4

To achieve this effect, you can utilize CSS. Upon implementation, I observed that the initial set of buttons has shifted to the left, but overall, it fulfills your requirements.

Feel free to experiment with the CSS to rectify any minor issues that may arise.

To suppress the JavaScript function responsible for removing the first up and last down button, I opted to conceal these buttons using CSS instead by including the following code snippet:

ul li:first-child .up{ 
    display:none;
}
ul li:last-child .down{ 
    display:none;
}

If you require further clarifications on the changes I've applied, please don’t hesitate to leave a comment below, and I'll address them promptly.

I trust this information proves beneficial. Happy coding!

Edit: Rectified button alignment issue

If you seek a quick resolution for the button positioning problem, consider replacing the CSS with the revised code snippet provided below:

ul li:first-child .up{ 
    visibility:hidden;
}

Answer 5

Answer №3

The solution provided here utilizes CSS to meet your requirement in the simplest way possible.

The usage of :last-child and :first-child selectors is employed to toggle the visibility of up and down buttons.

.list>ul>li:first-child>button.up{
  display:none;
}
.list>ul>li:first-child>button.down{
  margin-left: auto;
}
.list>ul>li:last-child>button.down{
  display:none;
}

const listDiv = document.querySelector("div");
const inputDescription = document.querySelector("input.description");
const pDescription = document.querySelector('p.description');
const buttonDescription = document.querySelector('button.description');
const addItemList = document.querySelector('button.adder');
const addInput = document.getElementsByClassName('addInput')[0];
const ul = document.querySelector('ul');
const removeButton = document.querySelector('button.remover');
const lis = ul.children;


function addButtons (li){

    let up = document.createElement("BUTTON");
    up.className = "up"
    up.textContent="up"
    li.appendChild(up);
    
    let down = document.createElement("BUTTON");
    down.className = "down"
    down.textContent="down"
    li.appendChild(down);
    
    let remove = document.createElement("BUTTON");
    remove.className = "remove"
    remove.textContent="remove"
    li.appendChild(remove);
}

for (var i = 0 ; i<lis.length ;i++){
    
    addButtons(lis[i]);
}

buttonDescription.addEventListener('click', ()=>{
   pDescription.textContent = inputDescription.value+':';
});  


addItemList.addEventListener('click',()=>{
    
    let newLI = document.createElement("li"); 
    newLI.textContent = addInput.value;
    addButtons(newLI)
    ul.appendChild(newLI);
    addInput.value = '';
});


removeButton.addEventListener('click', ()=>{
    
    const lastChild = document.querySelector('li:last-child');
    ul.removeChild(lastChild);
    
});



ul.addEventListener('click',(event)=>{
        
    if (event.target.tagName == "BUTTON"){
       if (event.target.className=="remove"){
       const par1 = event.target.parentNode;
       const par2 = par1.parentNode;
       par2.removeChild(par1);
   }
       if (event.target.className=="up"){
        
            const li = event.target.parentNode;
            const prevLi = li.previousElementSibling;
            if (prevLi)
                ul.insertBefore(li,prevLi);
       }
        
        else if (event.target.className=="down"){
           
            const li = event.target.parentNode;
            const nextLi = li.nextElementSibling;
            if (nextLi)
                ul.insertBefore(nextLi,li);                    

   }
   }
});

@import 'https://fonts.googleapis.com/css?family=Lato:400,700';

body {
  color: #484848;
  font-family: 'Lato', sans-serif;
  padding: .45em 2.65em 3em;
  line-height: 1.5;
}
h1 {
  margin-bottom: 0;
}
.list>ul>li:first-child>button.up{
  display:none;
}
.list>ul>li:first-child>button.down{
  margin-left: auto;
}
.list>ul>li:last-child>button.down{
  display:none;
}
h1 + p {
  font-size: 1.08em;
  color: #637a91;
  margin-top: .5em;
  margin-bottom: 2.65em;
  padding-bottom: 1.325em;
  border-bottom: 1px dotted;
}
ul {
  padding-left: 0;
  list-style: none;
}
li {
  padding: .45em .5em;
  margin-bottom: .35em;
  display: flex;
  align-items: center;
}
input,
button {
  font-size: .85em;
  padding: .65em 1em;
  border-radius: .3em;
  outline: 0;
}
input {
  border: 1px solid #dcdcdc;
  margin-right: 1em;
}
div {
  margin-top: 2.8em;
  padding: 1.5em 0 .5em;
  border-top: 1px dotted #637a91;
}
p.description,
p:nth-of-type(2) {
  font-weight: bold;
}
/* Buttons */
button {
  color: white;
  background: #508abc;
  border: solid 1px;
  border-color: rgba(0, 0, 0, .1);
  cursor: pointer;
}
button + button {
  margin-left: .5em;
}
p + button {
  background: #52bab3;
}
.list button + button {
  background: #768da3;
}
list li button + button {
  background: #508abc;
}
li button:first-child {
  margin-left: auto;
  background: #52bab3;
}
.list li button:last-child {
  background: #768da3;
}
li button {
  font-size: .75em;
  padding: .5em .65em;
}

<!DOCTYPE html>
<html>
    
    
    
    <head>
        
        <title>My First Website</title>
        <link rel="stylesheet" href="style.css">

    </head>
    
    
    <body>
    
        <h2>Im the H2!</h2>
        <p>Im the p!</p>        
        <div class="list">
            <p class="description">The title of the list</p>
            <input type="text" class="description">
            <button class="description">change the title!</button>
            <ul>
                <li>first </li>
                <li>second</li>
                <li>third</li>
                <li>forth</li>
                <li>fifth</li>
                <li>sixth</li>
                <li>seventh</li>
                
            </ul>
            <input type="text" class="addInput">
            <button class="adder">Add!</button>
            <button class="remover">Remove!</button>
        </div>
        
        
        
            <script src="app.js"></script>
    </body>
    
    
    
    
</html>

Answer 6

The solution provided here utilizes CSS to meet your requirement in the simplest way possible.

The usage of :last-child and :first-child selectors is employed to toggle the visibility of up and down buttons.

.list>ul>li:first-child>button.up{
  display:none;
}
.list>ul>li:first-child>button.down{
  margin-left: auto;
}
.list>ul>li:last-child>button.down{
  display:none;
}

const listDiv = document.querySelector("div");
const inputDescription = document.querySelector("input.description");
const pDescription = document.querySelector('p.description');
const buttonDescription = document.querySelector('button.description');
const addItemList = document.querySelector('button.adder');
const addInput = document.getElementsByClassName('addInput')[0];
const ul = document.querySelector('ul');
const removeButton = document.querySelector('button.remover');
const lis = ul.children;


function addButtons (li){

    let up = document.createElement("BUTTON");
    up.className = "up"
    up.textContent="up"
    li.appendChild(up);
    
    let down = document.createElement("BUTTON");
    down.className = "down"
    down.textContent="down"
    li.appendChild(down);
    
    let remove = document.createElement("BUTTON");
    remove.className = "remove"
    remove.textContent="remove"
    li.appendChild(remove);
}

for (var i = 0 ; i<lis.length ;i++){
    
    addButtons(lis[i]);
}

buttonDescription.addEventListener('click', ()=>{
   pDescription.textContent = inputDescription.value+':';
});  


addItemList.addEventListener('click',()=>{
    
    let newLI = document.createElement("li"); 
    newLI.textContent = addInput.value;
    addButtons(newLI)
    ul.appendChild(newLI);
    addInput.value = '';
});


removeButton.addEventListener('click', ()=>{
    
    const lastChild = document.querySelector('li:last-child');
    ul.removeChild(lastChild);
    
});



ul.addEventListener('click',(event)=>{
        
    if (event.target.tagName == "BUTTON"){
       if (event.target.className=="remove"){
       const par1 = event.target.parentNode;
       const par2 = par1.parentNode;
       par2.removeChild(par1);
   }
       if (event.target.className=="up"){
        
            const li = event.target.parentNode;
            const prevLi = li.previousElementSibling;
            if (prevLi)
                ul.insertBefore(li,prevLi);
       }
        
        else if (event.target.className=="down"){
           
            const li = event.target.parentNode;
            const nextLi = li.nextElementSibling;
            if (nextLi)
                ul.insertBefore(nextLi,li);                    

   }
   }
});

@import 'https://fonts.googleapis.com/css?family=Lato:400,700';

body {
  color: #484848;
  font-family: 'Lato', sans-serif;
  padding: .45em 2.65em 3em;
  line-height: 1.5;
}
h1 {
  margin-bottom: 0;
}
.list>ul>li:first-child>button.up{
  display:none;
}
.list>ul>li:first-child>button.down{
  margin-left: auto;
}
.list>ul>li:last-child>button.down{
  display:none;
}
h1 + p {
  font-size: 1.08em;
  color: #637a91;
  margin-top: .5em;
  margin-bottom: 2.65em;
  padding-bottom: 1.325em;
  border-bottom: 1px dotted;
}
ul {
  padding-left: 0;
  list-style: none;
}
li {
  padding: .45em .5em;
  margin-bottom: .35em;
  display: flex;
  align-items: center;
}
input,
button {
  font-size: .85em;
  padding: .65em 1em;
  border-radius: .3em;
  outline: 0;
}
input {
  border: 1px solid #dcdcdc;
  margin-right: 1em;
}
div {
  margin-top: 2.8em;
  padding: 1.5em 0 .5em;
  border-top: 1px dotted #637a91;
}
p.description,
p:nth-of-type(2) {
  font-weight: bold;
}
/* Buttons */
button {
  color: white;
  background: #508abc;
  border: solid 1px;
  border-color: rgba(0, 0, 0, .1);
  cursor: pointer;
}
button + button {
  margin-left: .5em;
}
p + button {
  background: #52bab3;
}
.list button + button {
  background: #768da3;
}
list li button + button {
  background: #508abc;
}
li button:first-child {
  margin-left: auto;
  background: #52bab3;
}
.list li button:last-child {
  background: #768da3;
}
li button {
  font-size: .75em;
  padding: .5em .65em;
}

<!DOCTYPE html>
<html>
    
    
    
    <head>
        
        <title>My First Website</title>
        <link rel="stylesheet" href="style.css">

    </head>
    
    
    <body>
    
        <h2>Im the H2!</h2>
        <p>Im the p!</p>        
        <div class="list">
            <p class="description">The title of the list</p>
            <input type="text" class="description">
            <button class="description">change the title!</button>
            <ul>
                <li>first </li>
                <li>second</li>
                <li>third</li>
                <li>forth</li>
                <li>fifth</li>
                <li>sixth</li>
                <li>seventh</li>
                
            </ul>
            <input type="text" class="addInput">
            <button class="adder">Add!</button>
            <button class="remover">Remove!</button>
        </div>
        
        
        
            <script src="app.js"></script>
    </body>
    
    
    
    
</html>

I need to figure out how to incorporate a specific feature into my personal list by leveraging Javascript

Answer №1

Answer №2

Answer №3

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