Is there a way in Javascript to adjust the attributes of a class when a specific class is present?

Recently, I've been attempting to update the style of an element in my script, but only on a specific page. My strategy involved checking for a unique id (profile-advanced-details) and then adjusting the height of another id (page-body) to 1500px if found.

Despite implementing this code, it doesn't seem to be effective. Are there any syntax errors present? Is there perhaps a more efficient method to achieve this desired outcome?

var wrap = document.getElementById("page-body");

if (!document.getElementsById('profile-advanced-details').length){
  return;  // Do nothing if profile-advanced-details doesn't exist
}

else {
  wrap.style.height = "1500px"; // Change the height of page-body if it does exist
}

Any insights or guidance would be greatly appreciated!

Answer №1

In the world of HTML, ids stand out because they are unique identifiers for elements on a page. It's important to note that there is no function called document.getElementsById(). The correct method to use is actually document.getElementById(), which will either give you the element with the specified id or return null if no such element exists.

Answer №2

getElementById is usually used in the singular form, not plural. Furthermore, using .length may result in different outcomes based on the node.

if( document.getElementById('profile-advanced-details')) {
  document.getElementById('page-body').style.height = "1500px";
}

In some cases, CSS can also be utilized for the same purpose, but with a condition that the reference element ("profile-advanced-details") precedes the target element ("page-body"). Although this may not apply in this scenario, it's always beneficial to have this knowledge:

#profile-advanced-details + #page-body,
    #profile-advanced-details + * page-body {height:1500px}
/* potential CSS4 syntax: */
!#page-body #profile-advanced-details,
    !#page_body + #profile-advanced-details,
    !#page_body + * #profile-advanced-details {height:1500px}
$#page-body #profile-advanced-details,
    $#page_body + #profile-advanced-details,
    $#page_body + * #profile-advanced-details {height:1500px}
#page-body! #profile-advanced-details,
    #page_body! + #profile-advanced-details,
    #page_body! + * #profile-advanced-details {height:1500px}
#page-body$ #profile-advanced-details,
    #page_body$ + #profile-advanced-details,
    #page_body$ + * #profile-advanced-details {height:1500px}
/* Variations might occur due to spec changes and my recollection */

Answer №3

It is essential to remember that Element ids are unique. To ensure this uniqueness, consider assigning the classname 'profile-advanced-details' to your elements. Utilize document.getElementsByClassName to verify if such a class exists.

By incorporating this methodology into your code snippet, it will appear as follows:

var wrap = document.getElementById("page-body");

if (document.getElementsByClassName('profile-advanced-details').length == 0){
  return;  //no action needed if profile-advanced-details is missing
}

else {
  wrap.style.height = "1500px"; //adjust page-body height if found
}

Answer №4

When it comes to classes, do you say "class"? Then make this change:

         if (!document.getMyClass('profile-advanced-details').length)

instead of

         if (!document.getElementByAttribute('profile-advanced-details').length)

Answer №5

If you want to dynamically adjust the height of an element based on another element's existence, you can achieve this using JavaScript.

var container = document.querySelector(".main-content");

if (document.getElementById('related-articles-section')){
    // related-articles-section exists
    container.style.height = "1200px";
}

This code snippet is effective because if the getElementById function doesn't find the specified element, it will return null, causing the condition to evaluate as false and preventing the inner code from executing.

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