How to Retrieve Elements with the Same ID in JavaScript?

How to Retrieve Elements with the Same ID Using JavaScript's getElementById

Obtaining a collection of elements based on their shared ID using JavaScript's getElementById() method may seem challenging, considering its inability to handle multiple elements with identical IDs. However, for historical reasons, it's still relevant to explore this technique.

getElementById() and Multiple IDs

Typically, HTML elements should not have duplicate IDs, as it violates the requirement for uniqueness. However, in certain cases, such as working with improperly constructed HTML documentation, it may be necessary to manipulate elements with the same ID.

To bypass the inherent limitation of getElementById(), you can leverage the querySelectorAll() method instead. This method allows you to retrieve a collection of elements based on a specified CSS selector. By specifying the CSS selector "[id='myId']", you can select all elements with the given ID.

Code Example

Here's a code snippet that demonstrates how to use querySelectorAll() to obtain elements with the same ID:

var elms = document.querySelectorAll("[id='myId']");

// Perform operations on the collection of elements
for (var i = 0; i < elms.length; i++) {
  elms[i].style.display = "none"; // Example operation
}

In this example, the elms variable will contain an array-like collection of all elements with the specified ID. You can then perform any necessary operations on these elements, such as hiding them using the style.display property.

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