Posted By

Sephr on 03/05/09


Tagged

accessor getter setter


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Get Accessor (Getter/Setter)


 / Published in: JavaScript
 

$[gs]etter(obj, property) returns function() { return obj.__lookup[GS]etter__(property).apply(obj, Array.prototype.slice.call(arguments)) }

object.get[GS]etter(property) returns $[gs]etter(this, property)

Useful for getting the getters and setters of objects like location, so you can do stuff like location.getSetter("hash") to get the native hash-changing function.

Example:

var foo = {a: 5}
foo.__defineSetter__("bar", function(x) { return x/this.a })
var fooBarSetter = foo.getSetter("bar") // $setter(foo, "bar") also works
fooBarSetter(40) == 8

var changeHash = location.getSetter("hash")
changeHash("test")
var getHash = location.getGetter("hash")
getHash() == location.hash
getHash() == "#test"

function changeInnerHTML(el, html) { return el.getSetter("innerHTML")(html) }
changeInnerHTML(document.body, "test")
document.getSetter("title")("Test")
  1. function $setter(obj, prop) {
  2. return function() {
  3. return obj.__lookupSetter__(prop).apply(obj, Array.prototype.slice.call(arguments))
  4. }
  5. }
  6.  
  7. function $getter(obj, prop) {
  8. return function() {
  9. return obj.__lookupGetter__(prop).apply(obj, Array.prototype.slice.call(arguments))
  10. }
  11. }
  12.  
  13. Object.prototype.getSetter = function(prop) { return $setter(this, prop) }
  14. Object.prototype.getGetter = function(prop) { return $getter(this, prop) }

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