在键入"@"时实现jquery UI自动完成功能以显示建议

Question

我正在使用jquery UI AutoComplete来允许用户使用@mentions标记朋友.默认情况下,只要您将焦点放在文本框上,就会显示自动填充建议.只有在输入"@"时,如何才能显示建议？这是我到目前为止的代码:

var availableTags = [
            "ActionScript",
            "AppleScript",
            "Asp",
            "BASIC",
            ];
$("#tags").autocomplete({
    source: availableTags,
    minLength: 0
});

Answer 1

您可以通过为source自动完成选项提供一个功能来完成此操作:

var availableTags = [ /* Snip */];

function split(val) {
    return val.split(/@\s*/);
}

function extractLast(term) {
    return split(term).pop();
}

$("#tags")
// don't navigate away from the field on tab when selecting an item
.bind("keydown", function(event) {
    if (event.keyCode === $.ui.keyCode.TAB && $(this).data("autocomplete").menu.active) {
        event.preventDefault();
    }
}).autocomplete({
    minLength: 0,
    source: function(request, response) {
        var term = request.term,
            results = [];

        /* If the user typed an "@": */
        if (term.indexOf("@") >= 0) {
            term = extractLast(request.term);
            /* If they've typed anything after the "@": */
            if (term.length > 0) {
                results = $.ui.autocomplete.filter(
                availableTags, term);
            /* Otherwise, tell them to start typing! */
            } else {
                results = ['Start typing...'];
            }
        }
        /* Call the callback with the results: */
        response(results);
    },
    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;
    }
});

这是一个有效的例子:http://jsfiddle.net/BfAtM/2/

请注意,这几乎等同于这个演示,除了为用户键入的要求"@".该代码位于sourceoption参数内.

希望有所帮助.