Iterate through the elements in an array in order to generate new elements

Currently, I am in the process of comparing various popular javascript frameworks and I need to generate an HTML element for each object retrieved from an API.

const frameworks = [
  {
    name: "angular"
  },
  {
    name: "ember"
  },
  {
    name: "react"
  },
  {
    name: "vue"
  }
];

For simplicity, I am working with an array of objects (this is just a simplified version for easier readability).

I have a function that iterates through this array and at the moment, it only logs the name of the framework to the console. If I want to create an HTML element (such as a bootstrap card) for each item in the loop, what would be the most efficient approach?

frameworks.forEach(fw => {
    console.log(fw);
  });

Simply using a forEach function.

<div class="card" style="width: 18rem;">
  <img class="card-img-top" src=".../100px180/?text=Image cap" alt="Card image cap">
  <div class="card-body">
    <h5 class="card-title">Card title</h5>
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
  </div>
  <ul class="list-group list-group-flush">
    <li class="list-group-item">Cras justo odio</li>
    <li class="list-group-item">Dapibus ac facilisis in</li>
    <li class="list-group-item">Vestibulum at eros</li>
  </ul>
  <div class="card-body">
    <a href="#" class="card-link">Card link</a>
    <a href="#" class="card-link">Another link</a>
  </div>
</div>

I am attempting to accomplish this using vanilla JS instead of utilizing React. This approach seems a bit tedious. Should I create a template with the createElement() function to streamline this process?

javascript

Answer №1

When it comes to plain JavaScript: 

const libraries = [
  {
    name: "jQuery"
  },
  {
    name: "Lodash"
  },
  {
    name: "Underscore"
  },
  {
    name: "Moment"
  }
];

libraries.forEach( library => {
  const card = `<div class="card" style="width: 18rem;">
  <img class="card-img-top" src=".../100px180/?text=Image cap" alt="Card image cap">
  <div class="card-body">
    <h5 class="card-title">${library.name}</h5>
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
  </div>
  <ul class="list-group list-group-flush">
    <li class="list-group-item">Cras justo odio</li>
    <li class="list-group-item">Dapibus ac facilisis in</li>
    <li class="list-group-item">Vestibulum at eros</li>
  </ul>
  <div class="card-body">
    <a href="#" class="card-link">Card link</a>
    <a href="#" class="card-link">Another link</a>
  </div>
</div>`
  const element = document.createElement('div');
  element.innerHTML = card;
  document.body.appendChild(element.firstChild);
})

Answer №2

If you're looking to avoid adding event listeners, my recommendation would be to use insertAdjacentHTML():

const libraries = [
  {
    name: "react"
  },
  {
    name: "angular"
  },
  {
    name: "vue"
  },
  {
    name: "ember"
  }
];

libraries.forEach( library => 
  document.body.insertAdjacentHTML("beforeend", 
  `<div class="card" style="width: 18rem;">
  <img class="card-img-top" src=".../100px180/?text=Image cap" alt="Card image cap">
  <div class="card-body">
    <h5 class="card-title">${library.name}</h5>
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
  </div>
  <ul class="list-group list-group-flush">
    <li class="list-group-item">Cras justo odio</li>
    <li class="list-group-item">Dapibus ac facilisis in</li>
    <li class="list-group-item">Vestibulum at eros</li>
  </ul>
  <div class="card-body">
    <a href="#" class="card-link">Card link</a>
    <a href="#" class="card-link">Another link</a>
  </div>
</div>`))

Answer №3

If you're looking to optimize your code, consider using the reduce function instead of forEach. This way, you can prepare your HTML content as a string and then update the innerHTML of the parent element all at once, which would be much faster than adding elements individually.

Check out the example snippet below:

const frameworks = [{
    name: "angular"
  },
  {
    name: "ember"
  },
  {
    name: "react"
  },
  {
    name: "vue"
  }
];

document.querySelector('.content')
  .innerHTML = frameworks.reduce((a, fw) => a +=
  `<div class="card" style="width: 18rem;">
  <img class="card-img-top" src=".../100px180/?text=Image cap" alt="Card image cap">
  <div class="card-body">
    <h5 class="card-title">${fw.name}</h5>
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
  </div>
  <ul class="list-group list-group-flush">
    <li class="list-group-item">Cras justo odio</li>
    <li class="list-group-item">Dapibus ac facilisis in</li>
    <li class="list-group-item">Vestibulum at eros</li>
  </ul>
  <div class="card-body">
    <a href="#" class="card-link">Card link</a>
    <a href="#" class="card-link">Another link</a>
  </div>
</div>`, ''
);
.content {
  display: flex;
  flex-flow: row wrap;
}

.card {
  margin: .5rem;
  padding: 1rem;
  background: #fec
}
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<div class="content"></div>

Hopefully, this suggestion will help improve the efficiency of your code.

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