Looks like it should work to me, but I don't know because you are very
specific in your boolean tests. For example:
var blah = 'true'; //the string "true"
blah == true //this is false
elem.isDefault==true //this probably isn't working...
I don't know what getAttribute("default") is returning in your case, but
say it is a string representation of "true"/"false". If so, change line
26 of your pastie to:
isDefault: elem.getAttribute("default") == "true",
Now, in displayTopic, to get the topic use this simplified code:
var topic = topics.find( topicID ?
function(elem){ return elem.isDefault } :
function(elem){ return elem.id == topicID } );
Firefox and Firebug are your friends if there is any doubt as to what
values you have stored and how they are comparing in your code.
Colin
Vin wrote:
> Dear Colin:
> I took few minutes this morning to modify my code following your
> suggestion,and it works,but not entirely.
> There is a problem in the "displayTopic" function,where and when i use
> the "find" method of prototype's Enumerable object,and i couldn't
> figure it out.Is there anything wrong with my iterator function in
> that "find" method??
> I wrote the "displayTopic" function like this,and the iterator
> function as its nested function:
> The detail code i've pasted to pastie:http://pastie.caboo.se/
> 51571[line 73]
> function displayTopic(topicID){
> var topic;
> function iterator(elem){
> if(topicID==null ||topicID==""){
> return (elem.isDefault==true)?true:false;
> }else{
> return (elem.id==topicID)?true:false;
> }
> };
> //find method here
> topic=topics.find(iterator);
> alert(topic.id);//this's for test,it show nothing.
> alert("hi");//this's for test too,it show "hi"
> ....
> ....
> }
>
> Sincerely bookish Vin.:>
>
>
> >
>
>
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