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If you use getElementById to with document like - document.getElementById then it always works.
But however, if we perform the same on an element say x like x.getElementById, then it returns an error.
The unusual thing about this is that getElementsByClassName and getElementsByTagName work on the elements however getElementById doesn't!
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This can happen if the JavaScript code is executed before the page is fully loaded, so its not able to find the element. The solution is that you need to put your JavaScript code after the closure of the HTML element or more generally before < /body > tag.
You can call getElementById multiple times and it will work.
If there is no element with the given id , this function returns null . Note that the id parameter is case-sensitive, so document. getElementById("Main") will return null instead of the element <div id="main"> because "M" and "m" are different for the purposes of this method.
You can't have the same id multiple times. Use class instead. Show activity on this post. COMPONENTS: if you write reusable component e.g. ) in your example then if you put two ore more components into one document then you will get INVALID html.
Container IDs should be unique, so there's no reason to find an object by ID within another container. This is why you only need document.getElementById to access any element by its ID, whereas when you are searching by class or tag name, you might want to only search within a specific container, which is why you can do x.getElementsByClassName etc.
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