jQuery插件问题-使用JSON数据填充选择选项 [英] jQuery plugin question - populate select options with JSON data

问题描述

我正在尝试用来自Web服务的json数据填充选择.我收到错误消息:对象不支持此属性或方法."当我这样做$(this).html(options.join('')); 有什么想法我做错了吗?

I'm trying to fill selects with json data from a web service. I'm getting error 'Object doesn't support this property or method.' when I do this $(this).html(options.join('')); Any ideas what I'm doing wrong?

;(function($) {

    $.fillSelect = {};

    $.fn.fillSelect = function(url, map) {
        var jsonpUrl = url + "?callback=?";        
        $.getJSON(jsonpUrl, function(d) {
           var options = [];
           var txt = map[0];
           var val = map[1];
           options.push('<option>--Select--</option>');
           $.each(d, function(index, item) {
                options.push('<option value="' + item[val] + '">' + item[txt] + '</option>');
           });
           $(this).html(options.join(''));
           //getting error  Object doesn't support this property or method
        };
    };
})(jQuery);

推荐答案

问题出在变量this上.在您使用的上下文中，this可能是指jQuery对象本身(即不是结果集).试试这个:

The problem is the variable this. In the context you're using, this is probably referring to the jQuery object itself (that is, not the result set). Try this:

$.fn.fillSelect = function (url, map) {
    var $t = this;     // (this) is the jQuery result set

    $.getJSON( ... blah blah,

        $t.html(options.join(''));
    )
}

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