need to time in characters to times to display value

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Javascript

jQuery

SharePoint2013

i am displaying data in an autocomplete , my input box dont get the value first time only second times
so for example when typing A, it dont dislay but second time i type A it displays the value but i want to to display the value on keypress the first time and not second, i am using a sharepoint hosted app, and without document.ready it wont work at also, so how could i do to preventing to need to type 2 times to display value?

$(document).ready(function () {
    $("#subSiteTitle").keypress(function () {