This function is designed to only work under specific conditions

Looking for assistance with a function that takes an item ID as input and changes its border when pressed. The goal is to increase the border width by 2px when there is no border, and remove the border completely when pressed again. Currently, only the first condition seems to be working properly. Seeking help to troubleshoot this issue.

function PIG(x) {

        if (!(document.getElementById(x).style.border = "none")) {

            document.getElementById(x).style.border = "2px solid green";

        }

        else if(!(document.getElementById(x).style.border = "2px solid green")){

            document.getElementById(x).style.border = "none";

        }
    }
javascript

Answer №1

Using an assignment operator instead of a comparison operator can lead to errors in your code:

if (!(document.getElementById(x).style.border = "none")) {

To correct this, use the comparison operator like so:

if (!(document.getElementById(x).style.border === "none")) {
// --------------------------------------------^

Answer №2

Expect your if statement to behave differently!

if ( !(document.getElementById(x).style.border = "none"))

This will transform the border to none instead of verifying that the border value is set to none and disrupts a significant portion of your code logic!

Capture the fix initially and record your values once more. I am certain the solution will emerge.

Tackle the issue first before revising/logging your code: 

if (!(document.getElementById(x).style.border === "none"))

Answer №3

To correct your code, ensure you are using the triple equals comparison operator === instead of the single equals assignment operator =. Additionally, there is a logic error in your current implementation. Remember that ! represents "not". So, the following code snippet:

    if (!(document.getElementById(x).style.border === "none")) {

        document.getElementById(x).style.border = "2px solid green";

    }

    else if(!(document.getElementById(x).style.border === "2px solid green")){

        document.getElementById(x).style.border = "none";

    }

Can be interpreted as:

/*
If the border is NOT "none" (indicating it's probably solid green)
    -> Set the border to solid green
Otherwise if the border is NOT already solid green (likely indicating it's currently set to none)
   -> Set the border to none
*/

In order to fix this, remove the "NOT" by removing the negation operators ! from your code.

Click here for an example on Fiddle

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