javascript - jquery提到jquery ui autocomplete

Question

我正在尝试了解 jquery 提及插件 jquery mentions我在插件中看到了这一部分。谁能解释这是什么意思？最后一个返回函数有什么特别的作用？ 我想在匹配值的长度小于 4 时关闭自动完成下拉列表

     search: function (value, event) {
        var match, pos;
        //&& value.length >= this.options.minChars
        if (!value) {
            //sel = window.getSelection();
            //node = sel.focusNode;
            value = this._value();
            pos = Selection.get(this.element).start;
            value = value.substring(0, pos);
            match = this.matcher.exec(value);
            if (!match || match[1].length <= this.options.minChars) {
                return '';
            }

            this.start = match.index;
            this.end = match.index + match[0].length;
            this.searchTerm = match[1];
            //this._setDropdownPosition(node);
        }
        return $.ui.autocomplete.prototype.search.call(this, this.searchTerm, event);
    }

Answer 1

我解决了这个问题，因为我发现搜索项没有重置，下拉列表没有返回空值。所以我像这样更改了搜索代码。

 search: function (value, event) {
        var match, pos;
        //&& value.length >= this.options.minChars
        if (!value) {
            //sel = window.getSelection();
            //node = sel.focusNode;
            value = this._value();
            pos = Selection.get(this.element).start;
            value = value.substring(0, pos);
            match = this.matcher.exec(value);
            if (!match ) {

                return '';
            }


            this.start = match.index;
            this.end = match.index + match[0].length;
            this.searchTerm = match[1];
            if (match[1].length <= this.options.minChars) {//customization: to check minChars

                this.searchTerm = '';// customization: to clear autocomplete dropdown
            }
            this._setDropdownPosition($('.mentions')[0]);
        }
        return $.ui.autocomplete.prototype.search.call(this,this.searchTerm, event);
    }