Learn Functional Programming by Building a Spreadsheet - Step 17

JavaScript
1

Tell us what’s happening:

I’m having trouble with the attributes in the input element. I’ve done document.createElement(“input”), but I need help proceeding from there.

Your code so far

<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link rel="stylesheet" href="./styles.css" />
    <title>Functional Programming Spreadsheet</title>
  </head>
  <body>
    <div id="container">
      <div></div>
    </div>
    <script src="./script.js"></script>
  </body>
</html>

/* file: styles.css */
#container {
  display: grid;
  grid-template-columns: 50px repeat(10, 200px);
  grid-template-rows: repeat(11, 30px);
}

.label {
  background-color: lightgray;
  text-align: center;
  vertical-align: middle;
  line-height: 30px;
}

/* file: script.js */
const range = (start, end) => Array(end - start + 1).fill(start).map((element, index) => element + index);
const charRange = (start, end) => range(start.charCodeAt(0), end.charCodeAt(0)).map(code => String.fromCharCode(code));

window.onload = () => {
  const container = document.getElementById("container");
  const createLabel = (name) => {
    const label = document.createElement("div");
    label.className = "label";
    label.textContent = name;
    container.appendChild(label);
  }
  const letters = charRange("A", "J");
  letters.forEach(createLabel);
  range(1, 99).forEach(number => {
    createLabel(number);

// User Editable Region

    letters.forEach(letter => {
      const input = document.createElement("input");
    })

// User Editable Region

  })
}

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Challenge Information:

Learn Functional Programming by Building a Spreadsheet - Step 17

2

To set value for an attribute of a DOM element, you can use syntax:

element.attributeName = attributeValue;

Example: to set name attribute for input (DOM element) with the value "fullname":

input.name = "fullname";
3

I finally got the syntax.

1 Like
4

I understood the .type syntax but did not understand how and why letter and number variables were set inside the .id

5

Hi there,

Do you mean you don’t understand why we set the id attribute of the input element to letter + number?

It’s because the instruction asked us to do so:

Set the type attribute to text and the id attribute to letter + number.

The purpose of the block of code we’re writing is:

We’re iterating letter from "A" to "J", and iterating number from 1 to 99.
At each iteration, we create a new input element and set its id to: letter + number.

For example:

At the iteration when letter is "A", and number is 2,
we create a new input element with id is: "A2".
("A" + 2 = "A2")

That’s what we’re doing.