knockout.js - Javascript test for blur event -

i'm working knockout. i'm trying test enter key press or blur event.

html:

<input class="percent-text" data-bind="numeric: percent, value: percent, event: { keypress: $root.percentupdate, blur: $root.percentupdate }" type="number" min="1" max="100" oninput="maxlength(this)" maxlength="3" /> 

knockout model:

self.percentupdate = function (data, event) {             if (event.keycode === 13 || test blur here) { .... 

not sure how test blur event. thanks

not familiar knockout, assume regular javascript work:

self.percentupdate = function (data, event) {   if (event.keycode === 13 || event.type==='blur') {