Hacker News new | ask | show | jobs
by seumars 1665 days ago
Love this trick. It should be noted that the element is added to the window object as long as the id follows the syntax of a valid javascript variable (meaning no dashes).
1 comments
chrismorgan 1665 days ago
False on two counts:

1. It doesn’t need to be a valid JavaScript identifier, though if it isn’t you’ll need to use subscripting syntax to access it:

  > document.body.id = "like-this";
  > window["like-this"]
  <body id="like-this">
2. It’s not added to the window object; rather, property lookup on a window object falls back to looking up elements by ID if there is no such property:

  > typeof example
  "undefined"
  > document.body.id = "example";
  > example
  <body id="example">
  > example = "no longer an element";
  > example
  "no longer an element"
  > delete example;
  true
  > example
  <body id="example">
link