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: ObjectUserId: "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