Refreshing various innerHTML elements using a universal function

I'm attempting to consolidate several similar functions into one, but I'm encountering some challenges.

Below is an example of one of the original functions that is called by a button press:

function ADD_ONE(Variable_Name){
    Variable_Name += 1;
    document.getElementById(Variable_Name).innerHTML = Variable_Name;
};

Here is my attempt at the replacement:

function ADD_ONE(Variable_Name){
    Variable_Name += 1;
    document.getElementById(Variable_Name).innerHTML = Variable_Name;
};

However, this resulted in an error:

ref(v1.0).html:744 Uncaught TypeError: Cannot set property 'innerHTML' of null
    at ADD_ONE

I believe it's likely a simple mistake that I'm overlooking, but being relatively new to Javascript, I would appreciate any guidance.

javascriptinnerhtml

Answer №1

Can you share the HTML code you're working with? The error message you're seeing commonly indicates that the element being referenced in your document.getElementById() call is not present on the page. When this happens, the method returns null, which does not have an innerHTML property since it's not an actual element. Without examining the HTML code, it's challenging to pinpoint the exact issue.

Answer №2

The issue lies in the sequence in which you are modifying the Variable_Name. You are changing it before retrieving the original element. Try this instead:

var element = document.getElementById(Variable_Name);

Variable_Name += 1;

element.innerHtml += Variable_Name;

Answer №3

One reason for the element not existing in the DOM after incrementing your variable is due to the incorrect usage of the code:

Variable_Name += 1

This line is erroneous and results in the absence of the element in the DOM.

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