On Wed, 2007-07-18 at 21:25 -0600, Wade Preston Shearer wrote:
> Would someone be willing to walk me through the following javascript
> snippet, line-by-line? I do not understand what is happening exactly
> in the second, fourth, and sixth lines. The values being passed into
> the function are being picked up as an array, but I am not familiar
> with the syntax.
>
> <a onclick="javascript:Effect.Combo('drawer_one', {duration:
> 0.5});"></a>
{ x: 17, y: -2 } is an object literal, in other words it creates an
unnamed object with two properties, x having a value of 17 and y having
a value of -2. Or in the above example, an object with one property
named duration and a value of 0.5 .
> Effect.Combo = function(element) {
> element = $(element);
$ is a legal identifier name in JavaScript. Apparently there is
a function defined somewhere whose name is $, or there is a variable
named $ which has had a function assigned as its value.
> if(element.style.display == 'none') {
> new Effect.OpenUp(element, arguments[1] || {});
arguments[] is an array containing the arguments to the enclosing
function. arguments[1] may or may not exist, if it exists that means
there is a second argument in the call to Effect.Combo. If there is a
second argument then the expression
arguments[1] || {}
evaluates to the value of arguments[1] if that value is not false,
otherwise the expression evaluates to an object literal with no methods
and no properties.
> }else {
> new Effect.CloseDown(element, arguments[1] || {});
> }
> }
-- Walt
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