Avoiding Casting
From PowerUI
Revision as of 22:05, 9 February 2017 by 151.229.186.156 (talk) (Created page with "PowerUI 2 has a standardised DOM. That means that methods like '''getElementById''' return an '''Element''' rather than the more useful '''HtmlElement''', which results in a l...")
PowerUI 2 has a standardised DOM. That means that methods like getElementById return an Element rather than the more useful HtmlElement, which results in a lot of casting that previously wasn't required.
Why does it happen at all?
HTML5 can have content like SVG and MathML embedded within it; an SvgElement is not a HtmlElement. However, the vast majority of the time, you'll be interacting with a HtmlElement (and on the web, Javascript hides this from you).
Convenience functions
If you find an instance where a convenience function would be useful, please let us know!
(these ones have the bonus of being a little shorter too - just omit the word Element from the standard Web API)
| Class | Standard name | Convenience name | What it does |
|---|---|---|---|
| Document | getElementById | getById | Element to HtmlElement |
| Document | getElementByTagName | getByTagName | Element to HtmlElement |
| Document | getElementByAttribute | getByAttribute | Element to HtmlElement |
| Event | target | htmlTarget | Element to HtmlElement |
