39 lines
No EOL
1.1 KiB
JavaScript
39 lines
No EOL
1.1 KiB
JavaScript
define(function() {
|
|
|
|
/*
|
|
|
|
Storing JS data on HTML elements has, in the past, been a likely source of
|
|
memory leaks one way or the other. In this module, we create a set of
|
|
matching WeakMaps for connecting data to DOM and vice versa. The dom2 module
|
|
uses this to emulate jQuery's data() method, and other modules can import this
|
|
to ask for an element given a JS object (such as a tab instance).
|
|
|
|
*/
|
|
|
|
var elements = new WeakMap();
|
|
var objects = new WeakMap();
|
|
|
|
return {
|
|
get: function(key) {
|
|
var map = key instanceof HTMLElement ? elements : objects;
|
|
return map.get(key);
|
|
},
|
|
set: function(key, value) {
|
|
var isDom = key instanceof HTMLElement;
|
|
var forward = isDom ? elements : objects;
|
|
var reverse = isDom ? objects : elements;
|
|
forward.set(key, value);
|
|
reverse.set(value, key);
|
|
},
|
|
"delete": function(key) {
|
|
var isDom = key instanceof HTMLElement;
|
|
var forward = isDom ? elements : objects;
|
|
var reverse = isDom ? objects : elements;
|
|
var data = forward.get(key);
|
|
forward.delete(key);
|
|
reverse.delete(data);
|
|
}
|
|
}
|
|
|
|
|
|
}); |