London | Nadarajah_Sripathmanathan | book -library | Module-Data-Flows #178
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hi, |
debugging/book-library/index.html
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When I checked the code in index.html at https://validator.w3.org/, it indicated some errors.
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In terms of input validation,
- Are all input properly checked?
- Can
.valuebenull? (Do we need to checksomeInputElement.value == null?) - What if a user enters only space characters in the "title" input field?
- What if a users enters
-1or3.1416in the "pages" input field?
With the way the book's title is assigned to an HTML element, a book with a title containing special character sequence such as <i> can possibly ruin the display.
debugging/book-library/script.js
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| for (let n = rowsNumber - 1; n > 0; n--) { | ||
| table.deleteRow(n); | ||
| } |
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Instead of deleting the table rows one by one, can you think of a more efficient way to remove all rows (except the <th>...</th>) in the table?
debugging/book-library/script.js
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| alert(`You've deleted title: ${myLibrary[i].title}`); | ||
| myLibrary.splice(i, 1); |
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At the moment when the alert message is displayed, has the book mentioned in the message been deleted yet?
How would you rearrange these statements to make the message truthful?
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I do not see any changes made to the files. I am removing the "Complete" label for now. |
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| if (titleValue.length === 0) { | ||
| alert("Title cannot be just spaces!"); | ||
| return; | ||
| } |
| } | ||
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| const pagesNumber = parseInt(pagesValue, 10); | ||
| if (isNaN(pagesNumber) || pagesNumber < 1 || !Number.isInteger(pagesNumber)) { |
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You were using parseInt(). Why further check if pagesNumber is integer?
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| changeReadButton.addEventListener("click", function () { | ||
| myLibrary[i].read = !myLibrary[i].read; | ||
| changeReadButton.textContent = myLibrary[i].read ? "Yes" : "No"; |
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Could also consider calling render() to update the view to avoid maintaining two sets of code to update view.
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