Jquery - Autocomplete comma values From http://stackoverflow.com/questions/8716811/comma-separated-auto-complete-with-jquery-auto-complete

autocomplete.js

$("#<%= txtMultipleName.ClientID %>").autocomplete({
    source: function (request, response) {
        $.getJSON("AutoComplete.ashx", {
            term: extractLast(request.term)
        }, response);
    },
    search: function () {
        // custom minLength
        var term = extractLast(this.value);
        if (term.length < 1) {
            return false;
        }
    },
    focus: function () {
        // prevent value inserted on focus
        return false;
    },
    select: function (event, ui) {
        var terms = split(this.value);
        // remove the current input
        terms.pop();
        // add the selected item
        terms.push(ui.item.value);
        // add placeholder to get the comma-and-space at the end
        terms.push("");
        this.value = terms.join(", ");
        return false;
    }
});
function split(val) {
    return val.split(/,\s*/);
}
function extractLast(term) {
    return split(term).pop();
}