Thanks BJ.
I have looked a bit at boot.js and various startup modules. It is a bit
more clear (especially how $tw is created and populated, but not perfrect.
Still, I cannot say when the $tw can be used.
Specifically, if a create a new module with the classical
`(function(){ ... `
I will not be able to use `$tw.utils`. What should I do to "see" $tw ?
If I call my module from a Widget, I could pass my module the $tw variable
? Other ways ?
And, to go back to filter.js
For example, $tw is used inside the fonction
exports.compileFilter = function(filterString) {
Is it because filters.js is loaded through $tw.modules.applyMethods() that
$tw is in its scope ?
Alain
On Sun, Mar 20, 2016 at 8:22 PM, BJ <[email protected]> wrote:
> HI Alain,
> the modular structure of tiddlywiki is more extensive that 'require'.
>
> There is some documentation here
>
> tiddlywiki.com/dev. <http://tiddlywiki.com/dev>
>
> but mostly you can read the code! but ask questions when you get stuck.
>
> The $tw structure is populated in a number of step during the start up. It
> is defined at the begin of the boot and some basic functionality is added
> to it in boot.js. Alot of extra stuff in added to it in
>
> $:/core/modules/startup/load-modules.js
>
> javascipt modules in tiddlywiki can have a module-type that allow them to
> be add to $tw thru $tw.modules.applyMethods(). (including the filter
> functions)
>
> Some places use 'this' instead of $tw, may be for some future expansion of
> tw?
>
> all the best
>
> BJ
>
>
> On Sunday, March 20, 2016 at 5:16:22 PM UTC, Alain Dutech wrote:
>>
>>
>> Hi,
>> this must be a bunch of stupid questions but I'm still learning the logic
>> of javascript.
>>
>> 1) when is the global $tw variable available?
>> - what "module" are required for it to be available ?
>> - does it become available after
>> `require("$:/core/modules/widgets/widget.js");` ? Why ?
>> - how come $tw can be used in the filter.js module ? as show below
>>
>> exports.getFilterOperators = function() {
>> if(!this.filterOperators) {
>> $tw.Wiki.prototype.filterOperators = {};
>> $tw.modules.applyMethods("filteroperator",this.filterOperators);
>> }
>> return this.filterOperators;
>> };
>>
>> Is it because getFilterOperators is defined inside "exports" ??
>>
>> 2) To use the filter API, and in particular the filterTiddler function
>> defined in filters.js (see below), must I "require" filter.js, or
>> widget.js, or wiki.js or ???
>>
>> exports.filterTiddlers = function(filterString,widget,source) {
>> var fn = this.compileFilter(filterString);
>> return fn.call(this,source,widget);
>> };
>>
>> 3) the `this.wiki` of Widgets is initialized through the option
>> parameters in the Widget constructor.
>> so all the function exported by wiki.js are available through this.wiki ?
>>
>> 4) Is there like a list of "public" function available through $tw,
>> $tw.utils and this.wiki ? I am trying to guess by reading through the
>> various *.js modules, but I'm my knowledge of JS make this task a bit
>> tedious...
>>
>> Thanks for any hint or explanations or info.
>> Alain
>>
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