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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="http://www.mamicode.com/‘ + json[key].id + ‘">‘ + json[key].name + ‘</option>‘); } } $selBigClass.empty().append(html.join(‘‘)).change(function () { $txtCategory.val(this.value); $selThreeClass.hide(); if (this.value =http://www.mamicode.com/="" || this.value =http://www.mamicode.com/="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="http://www.mamicode.com/‘ + json[data].id + ‘">‘ + json[data].name + ‘</option>‘); } } $selSmallClass.empty().append(html.join(‘‘)).change(function () { $txtCategory.val(this.value); if (this.value =http://www.mamicode.com/="" || this.value =http://www.mamicode.com/="0") { $selThreeClass.hide(); $txtCategory.val($selBigClass.val()); return false; } var data =http://www.mamicode.com/ 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="http://www.mamicode.com/‘ + data[key].id + ‘">‘ + data[key].name + ‘</option>‘); } } $selThreeClass.empty().append(html.join(‘‘)).change(function () { $txtCategory.val(this.value); if (this.value =http://www.mamicode.com/="" || this.value =http://www.mamicode.com/="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
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