jQuery Autocomplete: How to enable cache? - jquery-ui

Question

This is my source code that use a function to push the suggestion array:
jQuery(document).ready(function ($){
var cache = {};
function split( val ) {
return val.split( /,\s*/ );
}
function extractLast( term ) {
return split( term ).pop();
}
$("#ctags-input")
.bind( "keydown", function( event ) {
if ( event.keyCode === $.ui.keyCode.TAB &&
$( this ).data( "autocomplete" ).menu.active ) {
event.preventDefault();
}
})
.autocomplete({
source: function(req, add){
var ctags_action = 'suggest_tags';
var term = req.term;
if (term in cache) {
add(cache[term]);
return;
}
$.getJSON(SuggestTags.url+'?callback=?&action='+ctags_action, req, function(data) {
var suggestions = [];
$.each(data, function(i, val){
suggestions.push({
label: val.name,
count: val.count
});
});
cache[term] = suggestions;
add(suggestions);
});
},
focus: function() {
return false;
},
select: function( event, ui ) {
var terms = split( this.value );
terms.pop();
terms.push( ui.item.value );
terms.push( "" );
this.value = terms.join( ", " );
return false;
}
})
.data( "autocomplete" )._renderItem = function( ul, item ) {
return $("<li></li>")
.data("item.autocomplete", item)
.append("<a>" + item.label + " (" + item.count+ ")</a>")
.appendTo(ul);
};
});
To add cache ability, jQ UI site demo directly uses response for data:
source: function( request, response ) {
var term = request.term;
if ( term in cache ) {
response( cache[ term ] );
return;
}
lastXhr = $.getJSON( "search.php", request, function( data, status, xhr ) {
cache[ term ] = data;
if ( xhr === lastXhr ) {
response( data );
}
});
}
How to implement this cache demo in my code?

Answer 1

Put suggestions in the cache.
var term = req.term;
if (term in cache) {
add(cache[term]);
return;
}
...
cache[term] = suggestions;
add(suggestions);