The best practices for utilizing both Id and class within a single HTML element

Below you'll find a snippet of code:

<form>
  <div class="form-group">
    <label for="inputEmail">Email</label>
    <input type="email" class="form-control" id="inputEmail" placeholder="Email">
  </div>
  <div class="form-group">
    <label for="inputPassword">Password</label>
    <input type="password" class="form-control" id="inputPassword" placeholder="Password">
  </div>
  <div class="form-group">
    <label class="form-check-label"><input type="checkbox"> Remember me</label>
  </div>
  <button type="submit" class="btn btn-primary">Sign in</button>
</form>

While I understand the purpose of an id and a class attribute, I'm puzzled by why both are used in the same element.

For instance, in the code above, the input has a class="form-control" and an id="inputPassword".

I'm seeking a clarification on when and why this combination is used, as I personally would typically only use the class and not the id in this scenario.

Answer №1

Both the id and class attributes offer flexibility in assigning properties to elements.

An element with an id attribute is uniquely identified on a page, while the class attribute allows multiple elements to share the same properties.

The value of the id attribute must be unique within the HTML page, whereas the class attribute can be reused throughout the page.

For instance, the class="form-control" is used to style an input as a form control, while id="inputPassword" is used to uniquely identify the input for specific interactions.

Answer №2

If you find yourself utilizing generic styles for specific elements, and desire to give a particular element unique properties, you can achieve this by assigning it a specific id. Ids not only allow for customization of individual elements but also facilitate easy access to them using JavaScript and jQuery.

Answer №3

In my opinion, having a function in the inputPassword is crucial for your id to serve a purpose. Personally, I find that using a class allows for that function to be utilized across multiple objects, whereas an id is more suited for a single, specific object.

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