Jquery三级联动(需要JSON数据)

Category.js

$(function () {
    BindCategory();
})

function BindCategory() {

    var $txtCategory = $("#txtCategoryId");
    var _selectId = ["selBigClass", "selSmallClass", "selThreeClass"];
    for (var i = 0; i < _selectId.length; i++) {
        var select = document.createElement("select");
        select.id = _selectId[i];
        select.name = _selectId[i];
        $txtCategory.parent().append(select);
    }
    var $selBigClass = $("#selBigClass");
    var $selSmallClass = $("#selSmallClass");
    var $selThreeClass = $("#selThreeClass");
    $selSmallClass.hide();
    $selThreeClass.hide();

    $.getJSON("Scripts/CategoryJson.js", function (json) {

        var html = [‘<option value="">请选择大类</option>‘];
        for (var key in json) {
            if (json[key].pid == 0) {
                html.push(‘<option value="‘ + json[key].id + ‘">‘ + json[key].name + ‘</option>‘);
            }
        }

        $selBigClass.empty().append(html.join(‘‘)).change(function () {
            $txtCategory.val(this.value);
            $selThreeClass.hide();
            if (this.value == "" || this.value == "0") {
                $selSmallClass.hide();
                return false;
            }
            $selSmallClass.show();
            var html = [‘<option value="">请选择小类</option>‘];
            for (var data in json) {
                if (json[data].pid == $("#selBigClass").val()) {
                    html.push(‘<option value="‘ + json[data].id + ‘">‘ + json[data].name + ‘</option>‘);
                }
            }

            $selSmallClass.empty().append(html.join(‘‘)).change(function () {
                $txtCategory.val(this.value);
                if (this.value == "" || this.value == "0") {
                    $selThreeClass.hide();
                    $txtCategory.val($selBigClass.val());
                    return false;
                }
                var data = json;
                $selThreeClass.show();
                var html = [‘<option value="">请选择小类</option>‘];
                for (var key in data) {
                    if (data[key].pid == $("#selSmallClass").val()) {
                        html.push(‘<option value="‘ + data[key].id + ‘">‘ + data[key].name + ‘</option>‘);
                    }
                }

                $selThreeClass.empty().append(html.join(‘‘)).change(function () {
                    $txtCategory.val(this.value);
                    if (this.value == "" || this.value == "0") {
                        $txtCategory.val($selSmallClass.val());
                    }
                });

            });

        });

    });

};

CategoryJson.js（如何生成json数据详见：http://www.cnblogs.com/haozhenjie819/p/3601676.html）

1 [{ "id": 31, "name": "\u65b0\u95fb\u4e2d\u5fc3", "pid": 0, "itemvalue": "|0|" }, { "id": 54, "name": "\u5173\u4e8e\u76df\u53cb\u634c\u634c", "pid": 0, "itemvalue": "|0|" }, { "id": 59, "name": "\u52a0\u76df\u5408\u4f5c", "pid": 0, "itemvalue": "|0|" }, { "id": 64, "name": "\u5ba2\u670d\u670d\u52a1", "pid": 0, "itemvalue": "|0|" }, { "id": 65, "name": "\u4ea7\u54c1\u670d\u52a1", "pid": 0, "itemvalue": "|0|" },{ "id": 55, "name": "\u4f01\u4e1a\u6982\u51b5", "pid": 54, "itemvalue": "|0|54|" }, { "id": 56, "name": "\u4f01\u4e1a\u6587\u5316", "pid": 54, "itemvalue": "|0|54|" }, { "id": 57, "name": "\u4f01\u4e1a\u53d1\u5c55", "pid": 54, "itemvalue": "|0|54|" }, { "id": 58, "name": "\u8054\u7cfb\u6211\u4eec", "pid": 54, "itemvalue": "|0|54|" }, { "id": 60, "name": "\u52a0\u76df\u987b\u77e5", "pid": 59, "itemvalue": "|0|59|" }, { "id": 61, "name": "\u52a0\u76df\u6d41\u7a0b", "pid": 59, "itemvalue": "|0|59|" }, { "id": 62, "name": "\u52a0\u76df\u533a\u57df", "pid": 59, "itemvalue": "|0|59|" }, { "id": 66, "name": "\u67e5\u8be2\u7535\u8bdd", "pid": 64, "itemvalue": "|0|64|" }, { "id": 67, "name": "\u670d\u52a1\u7f51\u7edc", "pid": 64, "itemvalue": "|0|64|" }, { "id": 68, "name": "\u5e38\u89c1\u95ee\u9898", "pid": 64, "itemvalue": "|0|64|" }, { "id": 69, "name": "\u6295\u8bc9\u5efa\u8bae", "pid": 64, "itemvalue": "|0|64|" }, { "id": 70, "name": "\u63a8\u8350\u670d\u52a1", "pid": 65, "itemvalue": "|0|65|" }, { "id": 71, "name": "\u8ba1\u8d39\u65b9\u5f0f", "pid": 65, "itemvalue": "|0|65|" }, { "id": 72, "name": "\u7528\u6237\u987b\u77e5", "pid": 65, "itemvalue": "|0|65|" }, { "id": 73, "name": "\u7981\u5bc4\u8303\u56f4", "pid": 65, "itemvalue": "|0|65|" }, { "id": 75, "name": "\u666e\u901a\u5feb\u9012", "pid": 70, "itemvalue": "|0|65|70|" }, { "id": 76, "name": "\u7279\u79cd\u5feb\u4ef6", "pid": 70, "itemvalue": "|0|65|70|" }, { "id": 77, "name": "\u9650\u65f6\u6d3e\u9001", "pid": 70, "itemvalue": "|0|65|70|" }, { "id": 78, "name": "\u4ee3\u6536\u8d37\u6b3e", "pid": 70, "itemvalue": "|0|65|70|" }, { "id": 79, "name": "\u4fdd\u4ef7\u670d\u52a1", "pid": 70, "itemvalue": "|0|65|70|" }, { "id": 80, "name": "\u4ee3\u7b7e\u56de\u5355", "pid": 70, "itemvalue": "|0|65|70|"}]

html

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>三级联动</title>
    <script src="Scripts/jquery-1.4.1.min.js" type="text/javascript"></script>
    <script src="Scripts/Category.js" type="text/javascript"></script>
</head>
<body>
    <form id="form1" runat="server">
         <table>
            <tr>
                <td >新闻类别：</td>
                <td > <input id="txtCategoryId" name="txtCategoryId" type="hidden" runat="server" /></td>
            </tr>
        </table>
    </form>
</body>
</html>

效果图

Jquery三级联动(需要JSON数据),布布扣,bubuko.com