On Mon, Mar 8, 2010 at 11:16, Qoodary Doo <[email protected]> wrote:
> Hi Derrell,
>
> great, it works now with your solution and with one addListener.
> Thank you so much !!!!
>
You're welcome.
>
> I have learned a lot with you, even if I have not understand all in
> details.
> especially what you have donw with the "setUserData" and "getUserData".
> I first thought this was wrong written and means my "getTableData"
> function :-)
>
If you look at the implementation of setUserData and getUserData, it'll
likely be clear what's going on. setUserData is just saving the object you
pass as the second parameter in a map, identified by the string you pass in
the first parameter. getUserData just does a look-up in that map and returns
the value. Many people have an aversion to looking at the underlying source
code, but I'm a huge advocate of doing so. You learn an incredible amount by
looking at how things are done. Here's the implementation from
qx/core/Object.js:
/** {Map} stored user data */
__userData : null,
/**
* Store user defined data inside the object.
*
* @param key {String} the key
* @param value {Object} the value of the user data
* @return {void}
*/
setUserData : function(key, value)
{
if (!this.__userData) {
this.__userData = {};
}
this.__userData[key] = value;
},
/**
* Load user defined data from the object
*
* @param key {String} the key
* @return {Object} the user data
*/
getUserData : function(key)
{
if (!this.__userData) {
return null;
}
var data = this.__userData[key];
return data === undefined ? null : data;
},
Hope that helps.
Derrell
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