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tt-rss/lib/dojo/NodeList-data.js

176 lines
6.2 KiB
JavaScript

/*
Copyright (c) 2004-2011, The Dojo Foundation All Rights Reserved.
Available via Academic Free License >= 2.1 OR the modified BSD license.
see: http://dojotoolkit.org/license for details
*/
if(!dojo._hasResource["dojo.NodeList-data"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojo.NodeList-data"] = true;
dojo.provide("dojo.NodeList-data");
(function(d){
/*=====
dojo.NodeList.prototype.data = function(key, value){
// summary: stash or get some arbitrary data on/from these nodes.
//
// description:
// Stash or get some arbirtrary data on/from these nodes. This private _data function is
// exposed publicly on `dojo.NodeList`, eg: as the result of a `dojo.query` call.
// DIFFERS from jQuery.data in that when used as a getter, the entire list is ALWAYS
// returned. EVEN WHEN THE LIST IS length == 1.
//
// A single-node version of this function is provided as `dojo._nodeData`, which follows
// the same signature, though expects a String ID or DomNode reference in the first
// position, before key/value arguments.
//
// node: String|DomNode
// The node to associate data with
//
// key: Object?|String?
// If an object, act as a setter and iterate over said object setting data items as defined.
// If a string, and `value` present, set the data for defined `key` to `value`
// If a string, and `value` absent, act as a getter, returning the data associated with said `key`
//
// value: Anything?
// The value to set for said `key`, provided `key` is a string (and not an object)
//
// example:
// Set a key `bar` to some data, then retrieve it.
// | dojo.query(".foo").data("bar", "touched");
// | var touched = dojo.query(".foo").data("bar");
// | if(touched[0] == "touched"){ alert('win'); }
//
// example:
// Get all the data items for a given node.
// | var list = dojo.query(".foo").data();
// | var first = list[0];
//
// example:
// Set the data to a complex hash. Overwrites existing keys with new value
// | dojo.query(".foo").data({ bar:"baz", foo:"bar" });
// Then get some random key:
// | dojo.query(".foo").data("foo"); // returns [`bar`]
//
// returns: Object|Anything|Nothing
// When used as a setter via `dojo.NodeList`, a NodeList instance is returned
// for further chaning. When used as a getter via `dojo.NodeList` an ARRAY
// of items is returned. The items in the array correspond to the elements
// in the original list. This is true even when the list length is 1, eg:
// when looking up a node by ID (#foo)
};
dojo.NodeList.prototype.removeData = function(key){
// summary: Remove the data associated with these nodes.
// key: String?
// If ommitted, clean all data for this node.
// If passed, remove the data item found at `key`
};
dojo._nodeDataCache = {
// summary: An alias to the private dataCache for NodeList-data. NEVER USE THIS!
// This private is only exposed for the benefit of unit testing, and is
// removed during the build process.
};
=====*/
var dataCache = {}, x = 0, dataattr = "data-dojo-dataid", nl = d.NodeList,
dopid = function(node){
// summary: Return a uniqueish ID for the passed node reference
var pid = d.attr(node, dataattr);
if(!pid){
pid = "pid" + (x++);
d.attr(node, dataattr, pid);
}
return pid;
}
;
var dodata = d._nodeData = function(node, key, value){
var pid = dopid(node), r;
if(!dataCache[pid]){ dataCache[pid] = {}; }
// API discrepency: calling with only a node returns the whole object. $.data throws
if(arguments.length == 1){ r = dataCache[pid]; }
if(typeof key == "string"){
// either getter or setter, based on `value` presence
if(arguments.length > 2){
dataCache[pid][key] = value;
}else{
r = dataCache[pid][key];
}
}else{
// must be a setter, mix `value` into data hash
// API discrepency: using object as setter works here
r = d._mixin(dataCache[pid], key);
}
return r; // Object|Anything|Nothing
};
var removeData = d._removeNodeData = function(node, key){
// summary: Remove some data from this node
// node: String|DomNode
// The node reference to remove data from
// key: String?
// If omitted, remove all data in this dataset.
// If passed, remove only the passed `key` in the associated dataset
var pid = dopid(node);
if(dataCache[pid]){
if(key){
delete dataCache[pid][key];
}else{
delete dataCache[pid];
}
}
};
d._gcNodeData = function(){
// summary: super expensive: GC all data in the data for nodes that no longer exist in the dom.
// description:
// super expensive: GC all data in the data for nodes that no longer exist in the dom.
// MUCH safer to do this yourself, manually, on a per-node basis (via `NodeList.removeData()`)
// provided as a stop-gap for exceptionally large/complex applications with constantly changing
// content regions (eg: a dijit.layout.ContentPane with replacing data)
// There is NO automatic GC going on. If you dojo.destroy() a node, you should _removeNodeData
// prior to destruction.
var livePids = dojo.query("[" + dataattr + "]").map(dopid);
for(var i in dataCache){
if(dojo.indexOf(livePids, i) < 0){ delete dataCache[i]; }
}
};
// make nodeData and removeNodeData public on dojo.NodeList:
d.extend(nl, {
data: nl._adaptWithCondition(dodata, function(a){
return a.length === 0 || a.length == 1 && (typeof a[0] == "string");
}),
removeData: nl._adaptAsForEach(removeData)
});
// TODO: this is the basic implemetation of adaptWithCondtionAndWhenMappedConsiderLength, for lack of a better API name
// it conflicts with the the `dojo.NodeList` way: always always return an arrayLike thinger. Consider for 2.0:
//
// nl.prototype.data = function(key, value){
// var a = arguments, r;
// if(a.length === 0 || a.length == 1 && (typeof a[0] == "string")){
// r = this.map(function(node){
// return d._data(node, key);
// });
// if(r.length == 1){ r = r[0]; } // the offending line, and the diff on adaptWithCondition
// }else{
// r = this.forEach(function(node){
// d._data(node, key, value);
// });
// }
// return r; // dojo.NodeList|Array|SingleItem
// };
})(dojo);
}