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=2012-02-04
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 = $(fid).serialize(
//str= cardSelectDate=3&startdate=2012-02-01&enddate=2012-02-04
var ob= strToObj(str
alert(ob.startdate//2012-02-01
}
function strToObj(str){
str = str.replace(/&/g,"','"
str = str.replace(/=/g,"':'"
str = "{'"+str +"'})";
obj = eval(str
return obj;
}
不过这样做有bug。
其他的方法是，先用serializeArray序列化为数组，再封装为Json对象。
下面是表单：
< form id = "myForm" action = "#" >
< input name = "name" />
< input name = "age" />
< input type = "submit" />
</ form >
<form id="myForm" action="#">
<input name="name"/>
<input name="age"/>
<input type="submit"/>
</form>
Jquery插件代码：
( function ($){
$.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 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 >
<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>
