将JavaScript的jQuery库中表单转化为JSON对象的方法
将JavaScript的jQuery库中表单转化为JSON对象
大家知道Jquery中有serialize方法，可以将表单序列化为一个“&”连接的字符串，但却没有提供序列化为Json的方法。不过，我们可以写一个插件实现。
有人用替换的方法，先用serialize序列化后，将&替换成“：”、“‘”：
/*** 重置form表单* @param formId form的id*/function resetQuery(formId){var fid = "#" + formId;var str = $(fid).serialize();//str= cardSelectDate=3&startdate=2012-02-01&enddate=2012-02-04var ob= strToObj(str);alert(ob.startdate); //2012-02-01}function strToObj(str){str = str.replace(/&/g, "','" );str = str.replace(/=/g, "':'" );str = "({'" +str + "'})" ;obj = eval(str);return obj;}/** * 重置form表单 * @param formId form的id */ function resetQuery(formId){ var fid = "#" + formId; var str = $(fid).serialize(); //str= cardSelectDate=3&startdate=2012-02-01&enddate=2012-02-04 var ob= strToObj(str); alert(ob.startdate);//2012-02-01 } function strToObj(str){ str = str.replace(/&/g,"','"); str = str.replace(/=/g,"':'"); str = "({'"+str +"'})"; obj = eval(str); return obj; }不过这样做有bug。
其他的方法是，先用serializeArray序列化为数组，再封装为Json对象。
下面是表单：
< form id = "myForm" action = "#" >< input name = "name" />< input name = "age" />< input type = "submit" /></ form > <form action="#"> <input name="name"/> <input name="age"/> <input type="submit"/> </form>Jquery插件代码：
( function ($){$.fn.serializeJson= function (){var serializeObj={};$( this .serializeArray()).each( function (){serializeObj[ this .name]= this .value;});return serializeObj;};})(jQuery); (function($){ $.fn.serializeJson=function(){ var serializeObj={}; $(this.serializeArray()).each(function(){ serializeObj[this.name]=this.value; }); return serializeObj; }; })(jQuery);测试一下：
$("#myForm").bind("submit",function(e){ e.preventDefault();console.log($( this ).serializeJson());}); e.preventDefault(); console.log($(this).serializeJson()); });测试结果：
输入a，b提交，得到序列化结果：
{age: "b",name: "a"}
进一步优化
上面的插件，不能适用于有多个值的输入控件，例如复选框、多选的select。下面，将插件做进一步的修改，让其支持多选。代码如下：
( function ($){$.fn.serializeJson= function (){var serializeObj={};var array= this .serializeArray();var str= this .serialize();$(array).each( function (){if (serializeObj[ this .name]){if ($.isArray(serializeObj[ this .name])){serializeObj[ this .name].push( this .value);} else {serializeObj[ this .name]=[serializeObj[ this .name], this .value];}} else {serializeObj[ this .name]= this .value;}});return serializeObj;};})(jQuery);(function($){ $.fn.serializeJson=function(){ var serializeObj={}; var array=this.serializeArray(); var str=this.serialize(); $(array).each(function(){ if(serializeObj[this.name]){ if($.isArray(serializeObj[this.name])){ serializeObj[this.name].push(this.value); }else{ serializeObj[this.name]=[serializeObj[this.name],this.value]; } }else{ serializeObj[this.name]=this.value; } }); return serializeObj; }; })(jQuery);这里，将多选的值封装为一个数值来进行处理。如果大家使用的时候需要将多选的值封装为“,"连接的字符串或者其他形式，请自行修改相应代码。
测试如下：
表单：< form id = "myForm" action = "#" >< input name = "name" />< input name = "age" />< select multiple = "multiple" name = "interest" size = "2" >< option value = "interest1" > interest1 </ option >< option value = "interest2" > interest2 </ option >< option value = "interest3" > interest3 </ option >< option value = "interest4" > interest4 </ option ></ select >< input type = "checkbox" name = "vehicle" value = "Bike" /> I have a bike< input type = "checkbox" name = "vehicle" value = "Car" /> I have a car< input type = "submit" /></ form ><form action="#"> <input name="name"/> <input name="age"/> <select multiple="multiple" name="interest" size="2"> <option value ="interest1">interest1</option> <option value ="interest2">interest2</option> <option value="interest3">interest3</option> <option value="interest4">interest4</option> </select> <input type="checkbox" name="vehicle" value="Bike" /> I have a bike <input type="checkbox" name="vehicle" value="Car" /> I have a car <input type="submit"/> </form>< form id = "myForm" action = "#" >< input name = "name" />< input name = "age" />< select multiple = "multiple" name = "interest" size = "2" >< option value = "interest1" > interest1 </ option >< option value = "interest2" > interest2 </ option >< option value = "interest3" > interest3 </ option >< option value = "interest4" > interest4 </ option ></ select >< input type = "checkbox" name = "vehicle" value = "Bike" /> I have a bike< input type = "checkbox" name = "vehicle" value = "Car" /> I have a car< input type = "submit" /></ form ><form action="#"> <input name="name"/> <input name="age"/> <select multiple="multiple" name="interest" size="2"> <option value ="interest1">interest1</option> <option value ="interest2">interest2</option> <option value="interest3">interest3</option> <option value="interest4">interest4</option> </select> <input type="checkbox" name="vehicle" value="Bike" /> I have a bike <input type="checkbox" name="vehicle" value="Car" /> I have a car <input type="submit"/> </form>测试结果：
{age: "aa",interest: ["interest2", "interest4"],name: "dd",vehicle:["Bike","Car"]}处理序列化时的空格问题
jquery的 serialize()方法，可以对表单项进行序列化，这本来是很方便的一个功能；但是实际使用中有时会出现如下问题：
例如：
<input name="content" value="ddd 567"/>在执行 serialize()方法后，得到的却是 ddd+567这样的字符串；即jquery的序列化方法对空格进行了转义，转换成了 + 号。
解决方法
由于serialize()方法对真正的“+”号转义的是 ％２Ｂ，所以可以对serialize()后的结果进行符号替换。
例如：
<input name="content" value="ddd + 567 + 987"/><script>var a= $('$frm1').serialize(); //序列化，默认会调用encodeURIComponent()进行编码alert(a); // content=ddd+++567+++987var b = a.replace(/\\+/g," "); // g表示对整个字符串中符合条件的都进行替换b = decodeURIComponent(b); //对serialize后的内容进行解码alert(b); // content=ddd + 567 + 987</script>