构造AJAX参数， 表单元素JSON相互转换

ajax提交服务器数据， 整理一下转换方法。
HTML：

<form id="fm" name="fm" action="">
<input name="UserName" type="text" value="UserName1"/>
</form>
<input name="UserId" id="UserId" type="text" value="UserId1"/>

1.表单元素转QueryString

var q = $('#fm,#UserId').serialize(); //q = UserName=UserName1&UserId=UserId1

2.字符串， JSON 互相转换

var obj = jQuery.parseJSON('{"name":"John"}'); alert( obj.name === "John" );

可以利用jquery-json插件实现转换，直接引用示例

var thing = {plugin: 'jquery-json', version: 2.3}; var encoded = $.toJSON( thing ); // '{"plugin":"jquery-json","version":2.3}'
var name = $.evalJSON( encoded ).plugin; // "jquery-json"
var version = $.evalJSON(encoded).version; // 2.3

3.表单，元素转Name,Value数组

var arr = $("#fm,#UserId").serializeArray(); /*[ {name: 'UserName', value: '"UserName"1'}, {name: 'UserId', value: 'UserId'} ] */

4. 表单元素转JSON

$.fn.serializeObject = function() { var o = {}; var a = this.serializeArray(); $.each(a, function() { if (o[this.name] !== undefined) { if (!o[this.name].push) { o[this.name] = [o[this.name]]; } o[this.name].push(this.value || ''); } else { o[this.name] = this.value || ''; } }); return o; }; var obj = $('form').serializeObject(); /*obj: Object UserId: "UserId1" UserName: "UserName1" __proto__: Object*/

5. JSON2FORM

$.getJSON('url_to_file', function(data) { for (var i in data) { $('input[name="'+i+'"]').val(data[i]); } }

Google过程中发现一个更强大的插件 http://code.google.com/p/jquery-load-json/

data = { "Name":"Emkay Entertainments", "Address":"Nobel House, Regent Centre", "Contact":"Phone" } $('div#data').loadJSON(data); <div id="data">
<h1 id="Name">Emkay Entertainments</h1>
<label for="Address">Address:</label>
<span id="Address">Nobel House, Regent Centre</span>
<label for="Contact">Contact by:</label>
<span id="Contact">Phone</span>
</div>

ajax提交参数是，要注意提交参数的类型。如easyui grid 参数只能用JSON,不支持QueryString