How to change source of Struts2 autocompleter?

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How to change source of Struts2 autocompleter?



So i've made an autocompleter UI using struts2 tag. i.e "sj:autocompleter"



I need to change the source of the autocompleter on keyup. I'm giving first 100 results initially and then on keyup function i want the the source to change dynamically. How can i achieve this?



This is my autompleter tag


<sj:autocompleter name="locationName" selectBox="true"
selectBoxIcon="true"
requiredLabel=""
id="USER_NAME" autocomplete="off"
tabindex="%{session.fielddata.USER_NAME.getSearchFilterSequence()}"
label="%{session.fielddata.USER_NAME.getFieldLabel()}"
parentTheme="xhtml" labelSeparator=""
list="session.initialUserListForDropDown"
value="%{session.searchcriteria.locationName}"
cssClass="pointercursor resetfields"
style="border-radius:3px;"
maxLength="%{session.fielddata.USER_NAME.getFieldMaxValue()}">
</sj:autocompleter>



Below is the keyup function that i've binded with it


setTimeout(function(){
$(".form-group.username").find(".s2j-combobox-input.ui-autocomplete-input").keyup(function(event){
var userNameSearch= $(this).val();
if(event.which!=37 && event.which!=38 && event.which!=39 && event.which!=40 && event.which!=13)
{
var options_USER_NAME_widget = {};
options_USER_NAME_widget.hiddenid = "USER_NAME";
options_USER_NAME_widget.selectBox = true;
options_USER_NAME_widget.selectBoxIcon = true;
options_USER_NAME_widget.forceValidOption = true;
options_USER_NAME_widget.jqueryaction = "autocompleter";
options_USER_NAME_widget.id = "USER_NAME_widget";
options_USER_NAME_widget.name = "locationName_widget";
options_USER_NAME_widget.href = "applicationURL+"searchUserNameValues"+"?"+"userNameSearch"=userNameSearch

jQuery.struts2_jquery_ui.bind(jQuery('#USER_NAME_widget'),options_USER_NAME_widget);
}
});
},1000);



This is my JSON


{"searchedUserNames":["","admin","abcd","undertaker","hellya","ohno","grand","supp","oimate","cmom","sgray","jlambregtse","ssantana","jharris","cmanroy","lololo","abhi","bc","mc","di","admin1","admin2","admin3","adm2in","yoyo","BackendUser","hello"]}



This JSON is getting stored in the select as a string as it is .. What am i doing wrong? How can i get it work?



I've also tried to set the source via blow code but it didn't work


$(".form-group.username").find(".s2j-combobox-input ui-autocomplete-input").autocomplete( "option", "source", list );









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