Javascript: getElement

Get element by element name
e.g. document.getElementByTagName('p');

Get element by ID
e.g. document.getElementById('textarea_1');
To set value of an element like text, can simply refer the element by ID
<input id='abc' value='yyy'/>
abc.value='xxx';

Get active element which is currently on focus
e.g. document.getActiveElement

Get the type of currently active element
e.g. document.getActiveElement.type

remove currently active element's focus
e.g. document.getActiveElement.blur();