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Code Issues Releases Wiki Activity

Add the each filter operator

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This makes it possible to do grouping within lists
This commit is contained in:
Jeremy Ruston 2013-05-27 17:59:03 +01:00
parent 887d955fc4
commit ca51634041
1 changed files with 42 additions and 0 deletions
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core/modules/filters/each.js Normal file
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/*\
title: $:/core/modules/filters/each.js
type: application/javascript
module-type: filteroperator
Filter operator that selects one tiddler for each unique value of the specified field
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
/*
Export our filter function
*/
exports.each = function(source,operator,options) {
// Convert the source to an array if necessary
if(!$tw.utils.isArray(source)) {
var copy = [];
$tw.utils.each(source,function(element,title) {
copy.push(title);
});
source = copy;
}
// Collect up the first tiddler with each unique value of the specified field
var results = [],values = {};
$tw.utils.each(source,function(title) {
var tiddler = options.wiki.getTiddler(title);
if(tiddler) {
var value = tiddler.getFieldString(operator.operand);
if(!$tw.utils.hop(values,value)) {
values[value] = true;
results.push(title);
}
}
});
return results;
};
})();