simple javascript

JZeig
JZeig used Ask the Experts™
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I working with a training course on Lynda.com and I didn't purchase the exercise files. I created a file with a basic button, but it doesn't seem to be executing.  Basically, it's suppose to change the body color.  I was viewing in G Chrome.  The button appears on the browser, but won't execute code.

Any suggestions???
Hello.htm
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Commented:
document.getElementByID

should be

document.getElementById
JavaScript is case-sensitive, so watch carefully the case of the function names etc.
Instead of getElementByID() it should be getElementById()

Also, as a side notice, it's better practice to use the addEventListener() function to bind the event handler, than the rather old approach in your code.

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Commented:
Hello All,

@Chatal Thank you. I think the instructor called it "camel-case naming".  Gotta look that up.

@zc2 Thank you as well.  Now I'm just getting started, but I appreciate all help.  I'm sure he'll get to that optional code later.  But btw, in the case of this code, what would be the event handler. Is it the function or that name of the function?

@kaufmed NProblem & thanks for the info...  Oh and what is the difference???
Instead of assigning the function reference to the onclick attribute
document.getElementById('color').onclick = changeColor;
you pass that function reference to the addEventListener() function:
document.getElementById('color').addEventListener( "click", changeColor );
ǩa̹̼͍̓̂ͪͤͭ̓u͈̳̟͕̬ͩ͂̌͌̾̀ͪf̭̤͉̅̋͛͂̓͛̈m̩̘̱̃e͙̳͊̑̂ͦ̌ͯ̚d͋̋ͧ̑ͯ͛̉Glanced up at my screen and thought I had coded the Matrix...  Turns out, I just fell asleep on the keyboard.
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Commented:
JavaScript generally runs inside of a web browser. Java typically runs as a standalone executable--though it does have to be run through the Java runtime. Both languages have object-orientation, but the do so in different manners. Java is based on classes; JavaScript is based on prototypes (don't ask me to explain what that is; one of the web-dev guys would do it more justice than I could). Both languages are effectively cross-platform, though each could have different host implementations among the various platforms. Both languages have garbage collection, but each implements it in different ways. Both languages have C-style syntax. Java is a statically-typed language whereas Javascript is dynamically-typed.

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