SO - 19568041
by Ratan Paul
HTML
<input type="text" id="Search" value="Hello" style="text-align:right;"/>
JavaScript
var SearchInput = $('#Search');
SearchInput.val(SearchInput.val() + ' World!');
var strLength= SearchInput.val().length;
SearchInput.focus();
SearchInput[0].setSelectionRange(strLength, strLength);