更新对象 JSON 通过 Javascript

一个简单的解决方案 JavaScript, 强加出来

jsonObj

已经包含了 JSON:

上面的循环搜索相应的标识符，设置适当的用户名和

break

从循环发生变化后：

for /var i = 0; i < jsonObj.length; i++/ {

 if /jsonObj[i].Id === 3/ {

 jsonObj[i].Username = "Thomas";

 break;

 }

}

http://jsfiddle.net/cAyRs/1/
以下是函数中最包装的相同：

function setUsername/id, newUsername/ {

 for /var i = 0; i < jsonObj.length; i++/ {

 if /jsonObj[i].Id === id/ {

 jsonObj[i].Username = newUsername;

 return;

 }

 }

}



// Call as

setUsername/3, "Thomas"/;

只需重复列表，然后检查每个对象的属性。

for /var i = 0; i < jsonObj.length; ++i/ {

 if /jsonObj[i]['Id'] === '3'/ {

 jsonObj[i]['Username'] = 'Thomas';

 }

}

$/document/.ready/function//{ 

 var jsonObj = [{'Id':'1','Username':'Ray','FatherName':'Thompson'}, 

 {'Id':'2','Username':'Steve','FatherName':'Johnson'},

 {'Id':'3','Username':'Albert','FatherName':'Einstein'}];



 $.each/jsonObj,function/i,v/{ 

 if /v.Id == 3/ {

 v.Username = "Thomas";

 return false;

 }

 }/;



alert/"New Username: " + jsonObj[2].Username/;



}/;

使用：

var parsedobj = jQuery.parseJSON/ jsonObj/;

只有当您不需要留在字符串中时，这将是有用的。
否则，您必须将其转换为 JSON, 使用库 JSON.

var i = jsonObj.length;

while / i --> 0 / {

 if / jsonObj[i].Id === 3 / {

 jsonObj[ i ].Username = 'Thomas';

 break;

 }

}

或者，如果阵列始终订购 IDs:

jsonObj[ 2 ].Username = 'Thomas';

JSON - 这是

物体的名称

JavaScript . 这样的东西

一个东西 JSON

, 不存在 . JSON只是代表一个对象的方法 JavaScript 在文中。

因此，您正在寻找一种更新对象的方法 in in-memory JavaScript.

展示如何更简单。

我做了答案

Berkovsky在步骤 /或两者/ 此外，并创建了更灵活的功能，允许您使用任何搜索字段和任何目标字段。 对于娱乐，我有机会 splat / * /, 对某人可能想要为每个人提供替代品。

jQuery 必要的 NOT.

checkAllRows 允许您中断搜索找到性能的参数或更换先前提到的所有内容。

function setVal/update/ {

 /* Included to show an option if you care to use jQuery 

 var defaults = { jsonRS: null, lookupField: null, lookupKey: null,

 targetField: null, targetData: null, checkAllRows: false }; 

 //update = $.extend/{}, defaults, update/; */



 for /var i = 0; i < update.jsonRS.length; i++/ {

 if /update.jsonRS[i][update.lookupField] === update.lookupKey || update.lookupKey === '*'/ {

 update.jsonRS[i][update.targetField] = update.targetData;

 if /!update.checkAllRows/ { return; }

 }

 }

}





var jsonObj = [{'Id':'1','Username':'Ray','FatherName':'Thompson'}, 

 {'Id':'2','Username':'Steve','FatherName':'Johnson'},

 {'Id':'3','Username':'Albert','FatherName':'Einstein'}]

使用您的数据，您将使用：

var update = {

 jsonRS: jsonObj,

 lookupField: "Id",

 lookupKey: 2, 

 targetField: "Username",

 targetData: "Thomas", 

 checkAllRows: false

 };



setVal/update/;

和鲍勃 - 你的叔叔。 :/ [完美工作]

例如，我在篮子的功能中使用这种技术。

让我们将新产品添加到篮子里。

var productArray=[];





$/document/.on/'click','[cartBtn]',function/e/{

 e.preventDefault//;

 $/this/.html/'<i class="fa fa-check"></i>Added to cart'/;

 console.log/'Item added '/;

 var productJSON={"id":$/this/.attr/'pr_id'/, "nameEn":$/this/.attr/'pr_name_en'/, "price":$/this/.attr/'pr_price'/, "image":$/this/.attr/'pr_image'/, "quantity":1, "discount":0, "total":$/this/.attr/'pr_price'/};





 if/localStorage.getObj/'product'/!==null/{

 productArray=localStorage.getObj/'product'/;

 productArray.push/productJSON/; 

 localStorage.setObj/'product', productArray/; 

 }

 else{

 productArray.push/productJSON/; 

 localStorage.setObj/'product', productArray/; 

 }





 itemCountInCart/productArray.length/;



}/;

在向篮子添加某些项目后，会生成数组 json 像那样

[

 {

 "id": "95",

 "nameEn": "New Braslet",

 "price": "8776",

 "image": "1462012394815.jpeg",

 "quantity": 1,

 "discount": 0,

 "total": "8776"

 },

 {

 "id": "96",

 "nameEn": "new braslet",

 "price": "76",

 "image": "1462012431497.jpeg",

 "quantity": 1,

 "discount": 0,

 "total": "76"

 },

 {

 "id": "97",

 "nameEn": "khjk",

 "price": "87",

 "image": "1462012483421.jpeg",

 "quantity": 1,

 "discount": 0,

 "total": "87"

 }

]

从篮子里删除某种物品。

$/document/.on/'click','[itemRemoveBtn]',function//{



var arrayFromLocal=localStorage.getObj/'product'/;

findAndRemove/arrayFromLocal,"id",$/this/.attr/'basketproductid'//;

localStorage.setObj/'product', arrayFromLocal/;

loadBasketFromLocalStorageAndRender//;

}/;



//This function will remove element by specified property. In my case this is ID.

function findAndRemove/array, property, value/ {

 array.forEach/function/result, index/ {

 if/result[property] === value/ {

 //Remove from array

 console.log/'Removed from index is '+index+' result is '+JSON.stringify/result//;

 array.splice/index, 1/;



 } 

 }/;

}

最后，这个问题的真实答案 "Updating a JSON object using JS". 在我的示例中，在更改元素的值时更新产品数量和总价格 "number".

$/document/.on/'keyup mouseup','input[type=number]',function//{



 var arrayFromLocal=localStorage.getObj/'product'/;

 setQuantityAndTotalPrice/arrayFromLocal,$/this/.attr/'updateItemid'/,$/this/.val///;

 localStorage.setObj/'product', arrayFromLocal/;

 loadBasketFromLocalStorageAndRender//;

}/;



function setQuantityAndTotalPrice/array,id,quantity/ {



 array.forEach/function/result, index/ {

 if/result.id === id/ {

 result.quantity=quantity;

 result.total=/quantity*result.price/;

 } 

 }/;



}

var jsonObj = [{'Id':'1','Quantity':'2','Done':'0','state':'todo',

 'product_id':[315,"[LBI-W-SL-3-AG-TA004-C650-36] LAURA BONELLI-WOMEN'S-SANDAL"],

 'Username':'Ray','FatherName':'Thompson'}, 

 {'Id':'2','Quantity':'2','Done':'0','state':'todo',

 'product_id':[314,"[LBI-W-SL-3-AG-TA004-C650-36] LAURA BONELLI-WOMEN'S-SANDAL"],

 'Username':'Steve','FatherName':'Johnson'},

 {'Id':'3','Quantity':'2','Done':'0','state':'todo',

 'product_id':[316,"[LBI-W-SL-3-AG-TA004-C650-36] LAURA BONELLI-WOMEN'S-SANDAL"],

 'Username':'Albert','FatherName':'Einstein'}];



 for /var i = 0; i < jsonObj.length; ++i/ {

 if /jsonObj[i]['product_id'][0] === 314/ {





 this.onemorecartonsamenumber//;





 jsonObj[i]['Done'] = ""+this.quantity_done+"";



 if/jsonObj[i]['Quantity'] === jsonObj[i]['Done']/{

 console.log/'both are equal'/;

 jsonObj[i]['state'] = 'packed';

 }else{

 console.log/'not equal'/;

 jsonObj[i]['state'] = 'todo';

 }



 console.log/'quantiy',jsonObj[i]['Quantity']/;

 console.log/'done',jsonObj[i]['Done']/;





 }

 }



 console.log/'final',jsonObj/;

}



quantity_done: any = 0;



 onemorecartonsamenumber// {

 this.quantity_done += 1;

 console.log/this.quantity_done + 1/;

 }