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JavaScript jQuery Basics (2014) Creating a Simple Drawing Application Perform: Part 5

Steve Fan
Steve Fan
8,218 Points
Posted by Steve Fan
Steve Fan
8,218 Points

Code at line 62 in the video

The code line 61-63: }).mouseup(function(){ mouseDown = false; });

_I tried to use var "mouseDown" but It did not work at all, so just tried another way to do this. And when I moved to "Mouse Events" quiz. I just got a hint at the question: "Which of the following jQuery methods would I use to detect if someone presses down a mouse button and doesn't release it?" and the answer is "mousedown"

_So I made a try and It only work like the video when I modified "mouseDown" ==> "mousedown".

Anyone has same problems? How do you think about this prob? Is my understanding is in a right way?

I am quite confused when I do a different thing from the instructor and still get a result.

1 Answer

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

:point_right: Changing variable names will still work as long as it is consistent.

If you change a variable name the same way throughout a program, you should always get the same result as before.

The problem occurs when you use a different variable name in one place from the name used elsewhere in the code. The name must always match, even though the name itself isn't important.

On the other hand, a method name must always be used the same way as it was defined. And both method and variable names in JavaScript are case-sensitive. So for example, the method to establish an event handler for pressing the mouse button is ".mousedown", all lower case. It won't work if spelled any other way.