


Method to convert forms in JavaScript's jQuery library into JSON objects_jquery
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。
我在网上看到有人用替换的方法,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=2012-02-04 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; } /** * 重置form表单 * @param formId form的id */ function resetQuery(formId){ var fid = "#" + formId; var str = $(fid).serialize(); //str= cardSelectDate=3&startdate=2012-02-01&enddate=2012-02-04 var ob= strToObj(str); alert(ob.startdate);//2012-02-01 } function strToObj(str){ str = str.replace(/&/g,"','"); str = str.replace(/=/g,"':'"); str = "({'"+str +"'})"; obj = eval(str); return obj; }
个人感觉这样做有bug。
我的方法是,先用serializeArray序列化为数组,再封装为Json对象。
下面是表单:
< form id = "myForm" action = "#" > < input name = "name" /> < input name = "age" /> < input type = "submit" /> </ form > <form id="myForm" action="#"> <input name="name"/> <input name="age"/> <input type="submit"/> </form>
Jquery插件代码如下:
( function ($){ $.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);
下面测试一下:
$("#myForm").bind("submit",function(e){ e.preventDefault(); console.log($( this ).serializeJson()); }); e.preventDefault(); console.log($(this).serializeJson()); });
测试结果:
输入a,b提交,得到序列化结果
{age: "b",name: "a"}
上面的插件,不能适用于有多个值的输入控件,例如复选框、多选的select。下面,我将插件做进一步的修改,让其支持多选。代码如下:
( function ($){ $.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,我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 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>
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+++987 var 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>

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