Andreas Bachmann wrote:
> Hi
>
> I'm new to prototype and have some problems creating a class...
> really!!
> I'm using script.aculo.us too, but it's not a problem... rightnow ;)
>
> My code:
>
> var ImageButton = Class.create({
> initialize: function(e) {
> this.e = e;
> this.e.observe('mouseover', this.onMousOver);
> this.e.observe('mouseout', this.onMousOut);
> },
>
> onMousOver: function() {
> this.fadeIn();
> },
>
> onMouseOut: function() {
> this.fadeOut();
> },
>
> fadeIn: function() {
> new Effect.Fade(e, { duration: 1 });
> },
>
> fadeOut: function() {
> new Effect.Appear(e, { duration: 1, from: 1.0, to: 1.0 });
> }
> });
>
> document.observe('dom:loaded' , function() {
> var previous = new ImageButton($('previous'));
> var next = new ImageButton($('next'));
> });
>
> --> Firebug result: this.fadeIn is not a function
>
> The same code but shorter:
>
> var ImageButton = Class.create({
> initialize: function(e) {
> this.e = e;
> this.e.observe('mouseover', this.fadeIn);
> this.e.observe('mouseout', this.fadeOut);
> },
>
> fadeIn: function() {
> new Effect.Fade(e, { duration: 1 });
> },
>
> fadeOut: function() {
> new Effect.Appear(e, { duration: 1, from: 1.0, to: 1.0 });
> }
> });
>
> document.observe('dom:loaded' , function() {
> var previous = new ImageButton($('previous'));
> var next = new ImageButton($('next'));
> });
>
> --> Firebug result: e is not defined
>
> Any advice to get to work?
>
>
On the first bit, you need to bind the functions to "this" since the
body of those functions reference "this". so:
initialize: function(e) {
this.e = e;
this.e.observe('mouseover', this.onMousOver.bind(this));
this.e.observe('mouseout', this.onMousOut.bind(this));
},
On the second bit, you forgot to put "e" as a parameter to fadeIn() and
fadeOut().
- Ken Snyder
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