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Budget App With Javascript

Hey everyone. Welcome to today’s tutorial. In today’s tutorial, we will learn how to create a budget app. To build this app, we need HTML, CSS and Javascript.

Let us take a look at how this app works. Our budget app has two input sections. We use the first input section to set/update the budget. And we use the other input to enter the expense title and expense amount.

As soon as the user sets the budget or adds an expense, we display an output that shows the budget, total expenses, and the balance left.

Following this output, we display a list of all the expenses. This list of items comes with an option to either edit or delete them.

This tutorial is suitable for javascript beginners. If you are looking for more projects to improve your javascript skills, you should check out this playlist here. This playlist contains around 95+ javascript projects. The difficulty of these projects varies from simple to quite complex ones.

Video Tutorial:

If you are interested to learn by watching a video tutorial rather than reading this blog post. You should check out the video below. Also, subscribe to my youtube channel where I post new tutorials every alternate day.

Project Folder Structure:

Before we start coding let us take a look at the project folder structure. We create a project folder called – ‘ Budget App’. Inside this folder, we have three files. These files are index.html which is an HTML document. Next, we have style.css which is the stylesheet. Finally, we have script.js which is a script file.

HTML:

We begin with HTML. First, copy the code below and paste it into your HTML document.

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Budget App</title>
    <!-- Font Awesome Icons -->
    <link
      rel="stylesheet"
      href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.1.1/css/all.min.css"
    />
    <!-- Google Fonts -->
    <link
      href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;500&display=swap"
      rel="stylesheet"
    />
    <!-- Stylesheet -->
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <div class="wrapper">
      <div class="container">
        <div class="sub-container">
          <!-- Budget -->
          <div class="total-amount-container">
            <h3>Budget</h3>
            <p class="hide error" id="budget-error">
              Value cannot be empty or negative
            </p>
            <input
              type="number"
              id="total-amount"
              placeholder="Enter Total Amount"
            />
            <button class="submit" id="total-amount-button">Set Budget</button>
          </div>

          <!-- Expenditure -->
          <div class="user-amount-container">
            <h3>Expenses</h3>
            <p class="hide error" id="product-title-error">
              Values cannot be empty
            </p>
            <input
              type="text"
              class="product-title"
              id="product-title"
              placeholder="Enter Title of Product"
            />
            <input
              type="number"
              id="user-amount"
              placeholder="Enter Cost of Product"
            />
            <button class="submit" id="check-amount">Check Amount</button>
          </div>
        </div>
        <!-- Output -->
        <div class="output-container flex-space">
          <div>
            <p>Total Budget</p>
            <span id="amount">0</span>
          </div>
          <div>
            <p>Expenses</p>
            <span id="expenditure-value">0</span>
          </div>
          <div>
            <p>Balance</p>
            <span id="balance-amount">0</span>
          </div>
        </div>
      </div>
      <!-- List -->
      <div class="list">
        <h3>Expense List</h3>
        <div class="list-container" id="list"></div>
      </div>
    </div>
    <!-- Script -->
    <script src="script.js"></script>
  </body>
</html>

CSS:

Next, we style the app with CSS. For this copy, the code provided to you below and paste it into your stylesheet.

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;
}
body {
  background-color: #f7f9fd;
}
.wrapper {
  width: 90%;
  font-size: 16px;
  max-width: 43.75em;
  margin: 1em auto;
}
.container {
  width: 100%;
}
.sub-container {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3em;
}
.flex {
  display: flex;
  align-items: center;
}
.flex-space {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.wrapper h3 {
  color: #363d55;
  font-weight: 500;
  margin-bottom: 0.6em;
}
.container input {
  display: block;
  width: 100%;
  padding: 0.6em 0.3em;
  border: 1px solid #d0d0d0;
  border-radius: 0.3em;
  color: #414a67;
  outline: none;
  font-weight: 400;
  margin-bottom: 0.6em;
}
.container input:focus {
  border-color: #587ef4;
}
.total-amount-container,
.user-amount-container {
  background-color: #ffffff;
  padding: 1.25em 0.9em;
  border-radius: 0.3em;
  box-shadow: 0 0.6em 1.2em rgba(28, 0, 80, 0.06);
}
.output-container {
  background-color: #587ef4;
  color: #ffffff;
  border-radius: 0.3em;
  box-shadow: 0 0.6em 1.2em rgba(28, 0, 80, 0.06);
  margin: 2em 0;
  padding: 1.2em;
}
.output-container p {
  font-weight: 500;
  margin-bottom: 0.6em;
}
.output-container span {
  display: block;
  text-align: center;
  font-weight: 400;
  color: #e5e5e5;
}
.submit {
  font-size: 1em;
  margin-top: 0.8em;
  background-color: #587ef4;
  border: none;
  outline: none;
  color: #ffffff;
  padding: 0.6em 1.2em;
  border-radius: 0.3em;
  cursor: pointer;
}
.list {
  background-color: #ffffff;
  padding: 1.8em 1.2em;
  box-shadow: 0 0.6em 1.2em rgba(28, 0, 80, 0.06);
  border-radius: 0.6em;
}
.sublist-content {
  width: 100%;
  border-left: 0.3em solid #587ef4;
  margin-bottom: 0.6em;
  padding: 0.5em 1em;
  display: grid;
  grid-template-columns: 3fr 2fr 1fr 1fr;
}
.product {
  font-weight: 500;
  color: #363d55;
}
.amount {
  color: #414a67;
  margin-left: 20%;
}
.icons-container {
  width: 5em;
  margin: 1.2em;
  align-items: center;
}
.product-title {
  margin-bottom: 1em;
}
.hide {
  display: none;
}
.error {
  color: #ff465a;
}
.edit {
  margin-left: auto;
}
.edit,
.delete {
  background: transparent;
  cursor: pointer;
  margin-right: 1.5em;
  border: none;
  color: #587ef4;
}
@media screen and (max-width: 600px) {
  .wrapper {
    font-size: 14px;
  }
  .sub-container {
    grid-template-columns: 1fr;
    gap: 1em;
  }
}

Javascript:

Finally, we implement the functionality of the budget app. For this we use javascript. We do this in six steps:

  • Create initial references
  • Implement function to set budget
  • Function to disable Edit/Delete buttons
  • Create a function to modify list items
  • Create a function to create a list
  • Implement function to calculate expenses and balance.
let totalAmount = document.getElementById("total-amount");
let userAmount = document.getElementById("user-amount");
const checkAmountButton = document.getElementById("check-amount");
const totalAmountButton = document.getElementById("total-amount-button");
const productTitle = document.getElementById("product-title");
const errorMessage = document.getElementById("budget-error");
const productTitleError = document.getElementById("product-title-error");
const productCostError = document.getElementById("product-cost-error");
const amount = document.getElementById("amount");
const expenditureValue = document.getElementById("expenditure-value");
const balanceValue = document.getElementById("balance-amount");
const list = document.getElementById("list");
let tempAmount = 0;

//Set Budget Part
totalAmountButton.addEventListener("click", () => {
  tempAmount = totalAmount.value;
  //empty or negative input
  if (tempAmount === "" || tempAmount < 0) {
    errorMessage.classList.remove("hide");
  } else {
    errorMessage.classList.add("hide");
    //Set Budget
    amount.innerHTML = tempAmount;
    //Set Balance
    balanceValue.innerText = tempAmount - expenditureValue.innerText;
    //Clear Input Box
    totalAmount.value = "";
  }
});

//Function To Disable Edit and Delete Button
const disableButtons = (bool) => {
  let editButtons = document.getElementsByClassName("edit");
  Array.from(editButtons).forEach((element) => {
    element.disabled = bool;
  });
};

//Function To Modify List Elements
const modifyElement = (element, edit = false) => {
  let parentDiv = element.parentElement;
  let currentBalance = balanceValue.innerText;
  let currentExpense = expenditureValue.innerText;
  let parentAmount = parentDiv.querySelector(".amount").innerText;
  if (edit) {
    let parentText = parentDiv.querySelector(".product").innerText;
    productTitle.value = parentText;
    userAmount.value = parentAmount;
    disableButtons(true);
  }
  balanceValue.innerText = parseInt(currentBalance) + parseInt(parentAmount);
  expenditureValue.innerText =
    parseInt(currentExpense) - parseInt(parentAmount);
  parentDiv.remove();
};

//Function To Create List
const listCreator = (expenseName, expenseValue) => {
  let sublistContent = document.createElement("div");
  sublistContent.classList.add("sublist-content", "flex-space");
  list.appendChild(sublistContent);
  sublistContent.innerHTML = `<p class="product">${expenseName}</p><p class="amount">${expenseValue}</p>`;
  let editButton = document.createElement("button");
  editButton.classList.add("fa-solid", "fa-pen-to-square", "edit");
  editButton.style.fontSize = "1.2em";
  editButton.addEventListener("click", () => {
    modifyElement(editButton, true);
  });
  let deleteButton = document.createElement("button");
  deleteButton.classList.add("fa-solid", "fa-trash-can", "delete");
  deleteButton.style.fontSize = "1.2em";
  deleteButton.addEventListener("click", () => {
    modifyElement(deleteButton);
  });
  sublistContent.appendChild(editButton);
  sublistContent.appendChild(deleteButton);
  document.getElementById("list").appendChild(sublistContent);
};

//Function To Add Expenses
checkAmountButton.addEventListener("click", () => {
  //empty checks
  if (!userAmount.value || !productTitle.value) {
    productTitleError.classList.remove("hide");
    return false;
  }
  //Enable buttons
  disableButtons(false);
  //Expense
  let expenditure = parseInt(userAmount.value);
  //Total expense (existing + new)
  let sum = parseInt(expenditureValue.innerText) + expenditure;
  expenditureValue.innerText = sum;
  //Total balance(budget - total expense)
  const totalBalance = tempAmount - sum;
  balanceValue.innerText = totalBalance;
  //Create list
  listCreator(productTitle.value, userAmount.value);
  //Empty inputs
  productTitle.value = "";
  userAmount.value = "";
});

That’s all for this tutorial. If you face any issues while creating this code, you can download the source code by clicking on the ‘Download Code’ Button below. Also, I would love to hear from you guys, so if you have any queries, suggestions, or feedback you can drop them in the comments below.
Happy Coding!

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2 COMMENTS

  1. how to subtract only once to expenditure so that next subtract to balance is from useramount.value
    totalAmountButton.addEventListener(“click”, () =>
    {
    tempAmount = parseFloat(totalAmount.value)
    //empty or negative input
    if (!tempAmount === “” || tempAmount < 0)
    {
    errorMessage.classList.remove("hide")
    } else {
    errorMessage.classList.add("hide")
    //Set Budget
    let currentAmount = parseFloat(amount.innerHTML)
    let newAmount = currentAmount + tempAmount
    amount.innerHTML = newAmount
    //Set Balance
    balanceValue.innerText = newAmount – expenditureValue.innerText
    //Clear Input Box
    totalAmount.value = ""
    }
    })

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