Question

In: Computer Science

1 – Create a webpage that contains a table with exactly three rows and two columns....

  1. 1 – Create a webpage that contains a table with exactly three rows and two columns.
  1. The first row will contain a table heading containing the name of a US National Park, that spans across all columns. Hint: use the colspan attribute inside the opening th tag
  2. Give the table heading an onmouseover that will change the text of the heading when it is moused over to read My Favorites Park! (Hint: use innerHTML). Use onmouseout to change it back.
  3. The second and third rows will contain 2 thumbnail(small) images each. (See Creating Square Thumbnails section below).
  • These are images from the National Park that you selected
  • Remember your code, pages, images will not be like anyone else’s. When they are compared you do not want your file to be flagged.
  1. Use the anchor element on the thumbnail images, so that each thumbnail image opens a larger version of the same image in a new tab. (Hint: if you give the target a name, you can have them all open in the same tab rather than using _blank and having a new tab open each time one is clicked. This avoids opening too many tabs.)
  2. Apply style to the table. Again, your table will not be like anyone else’s. Your work is to be your own work.
  3. Write the JavaScript code so that each thumbnail image in the table opens the larger original image in the large cell in row four/five of the table when the thumbnail is clicked.
    1. E.g., clicking on dog_small.png should cause dog.png to open in the large cell of the table as a 300px by 300px image replacing the image that was previously there.
    2. Note: Write a function to replace the large image with the new image.
    3. Hint: The onclick will just call the function.

Solutions

Expert Solution

NOTE:
- I have taken some sample images. You can use your own images by replacing the src attribute of img tags.
Put the images in the same directory where you put these html, css and js files.
- External CSS and External JS have been used and imported at appropriate place in the HTML file.
- Read through the comments in the Javascript file (index.js) to understand its working.

Index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Favorite Park!</title>
    <link rel="stylesheet" href="styles.css" />
  </head>
  <body>
    <main>
      <table>
        <thead>
          <tr>
            <th colspan="2">US National Park</th>
          </tr>
        </thead>
        <tbody>
          <tr>
            <td>
              <img class="thumbnail-img" src="np1.jpg"  />
            </td>
            <td>
              <img class="thumbnail-img" src="np2.jpg"  />
            </td>
          </tr>
          <tr>
            <td>
              <img class="thumbnail-img" src="np3.jpg"  />
            </td>
            <td>
              <img class="thumbnail-img" src="np4.jpeg"  />
            </td>
          </tr>
          <tr>
            <td>
              <img class="thumbnail-img" src="np5.jpg"  />
            </td>
            <td>
              <img class="thumbnail-img" src="np6.jpg"  />
            </td>
          </tr>
          <tr class="larger-img">
            <td colspan="2">
              <a target="_blank" href="np1.jpg"
                ><img class="image-lg" src="np1.jpg" 
              /></a>
            </td>
          </tr>
        </tbody>
      </table>
    </main>
    <script src="index.js"></script>
  </body>
</html>

styles.css

table,
th,
td {
  border: 1px solid black;
  border-collapse: collapse;
}

tr > th {
  cursor: pointer;
}
td {
  padding: 5px;
  text-align: center;
}

.thumbnail-img,
.image-lg {
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 5px;
  width: 150px;
}

.image-lg {
  width: 300px;
  height: 300px;
}

table {
  font-family: Arial, Helvetica, sans-serif;
  border-collapse: collapse;
  margin: 0 auto;
  width: 50%;
}

table td,
table th {
  border: 1px solid #ddd;
  padding: 8px;
}

table tr td:hover {
  background-color: #f2f2f2;
}

table tr td img:hover {
  cursor: pointer;
}

table th {
  padding-top: 12px;
  padding-bottom: 12px;
  text-align: center;
  background-color: #ff7a0e;
  color: white;
}

index.js

//First we get the reference to the DOM node of Table Heading th
const tableHeading = document.querySelector('tr > th')

//We add an event listener to the table heading to listen to mouseover event. We then pass the event listener the callback function that sets the text to "My Favorite Park" when we hover over the heading
tableHeading.addEventListener('mouseover', function () {
  tableHeading.innerHTML = 'My Favorite Park!'
})

//We also add a mouseout event on the heading so that when we remove the cursor from the heading, the heading text changes back to "US National Park"
tableHeading.addEventListener('mouseout', function () {
  tableHeading.innerHTML = 'US National Park'
})

//now we take the reference to the larger image and the link of the larger image and to the table
const largerImageLink = document.querySelector('.larger-img a')
const largerImage = document.querySelector('.larger-img img')
const table = document.querySelector('table')

// Here we are using event-delegation.
//In event delegation, we add an event listener to the parent rather than to each individual child
// Whenever a thumbnail image is clicked, we check for an event on the table.
//We determine if the click event occurred on the thumbnail image, if thumbnail image is clicked we set the src attribute of the largerImage to the thumbnail image that was clicked
table.addEventListener('click', function (e) {
  const target = e.target
  if (target.tagName !== 'IMG') {
    return
  } else {
    largerImage.setAttribute('src', target.getAttribute('src'))
    largerImageLink.setAttribute('href', target.getAttribute('src'))
  }
})

OUTPUT FROM THE BROWSER

NOTE:

Initially, the larger image in row 4 shows the first thumbnail image. As you click on the different thumbnail images the larger image will be replaced by that particular image which was clicked.




venereology answered 1 year ago
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