Maximizing JavaScript DOM efficiency

In my code, I have numerous elements that need to be hidden and displayed dynamically. To facilitate this, I plan on utilizing the 

document.getElementById('x').style.display
method. However, instead of directly using this method each time, I have opted to create two separate functions to handle the task for me:

function displayNone(a){document.getElementById(a).style.display= "none";}
function displayBlock(a){document.getElementById(a).style.display="block";}

By calling these functions with the corresponding ID as an argument, I will achieve the desired result. Now, my question is whether there would be any performance drawbacks in using this structured approach compared to simply employing 

document.getElementById('x').style.display
directly without encapsulating it within a function call.

javascriptdom

Answer №1

My question: Is there a performance impact when choosing one method over another?

Absolutely. The execution of the function will be slower.

The real question is by how much. It may only be a minuscule amount. Some engines might even optimize and inline the function call, essentially eliminating any performance hit. Even if not optimized, the speed reduction is likely in fractions of microseconds.

Like with any potential performance issue, the best approach is to develop your application first, then identify and address any performance bottlenecks as they arise.

On a different note, it is advisable - as pointed out by a commenter - to avoid referencing DOM elements by their IDs. Instead of passing an ID to a function and retrieving the element each time, consider passing the actual DOM element directly to the function. The overhead of repeatedly using getElementById outweighs the cost of an additional function call.

Furthermore, it is recommended to refrain from setting styles directly on elements. Opt for defining a CSS class like 

.hide { display: none; }

and toggle the visibility of elements by adding or removing this class:

function hide(e) { e.classList.add('hide'); }
function show(e) { e.classList.remove('hide'); }

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