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