Get the cursor position in an input field. Best to use in combination with 'keyup', 'keydown', 'focus', etc. events.

getCursorPosition.js

/**
 * Get Cursor Position in Input Field
 * @return integer Returns the cursor position.
 * 
 * Source: Stackoverflow
 * Source URI: http://stackoverflow.com/a/2897510/3107931
 * 
 * Usage: $('input[type="text"]').getCursorPosition()
 */
$.fn.getCursorPosition = function() {
  var input = this.get(0);
  if (!input) return; // No (input) element found
  if ('selectionStart' in input) {
    // Standard-compliant browsers
    return input.selectionStart;
  } else if (document.selection) {
    // IE
    input.focus();
    var sel = document.selection.createRange();
    var selLen = document.selection.createRange().text.length;
    sel.moveStart('character', -input.value.length);
    return sel.text.length - selLen;
  }
}