将新数组元素添加到JSON对象

时间:2013-09-19 01:17:50

标签: javascript json

我有一个JSON格式对象,我从一个名为teamJSON的变量中的JSON文件中读取,如下所示:

 {"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}

我想在数组中添加一个新项目,例如

{"teamId":"4","status":"pending"}

最终以

结束
{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"},{"teamId":"4","status":"pending"}]}

在写回文件之前。添加到新元素的好方法是什么?我接近但所有双引号都被逃脱了。我已经找到了一个很好的答案,但没有一个完全覆盖这个案例。任何帮助表示赞赏。

5 个答案:

答案 0 :(得分:186)

JSON 只是一个符号;进行您想要的更改parse,以便您可以将更改应用于本机 JavaScript对象,然后stringify返回 JSON

var jsonStr = '{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}';

var obj = JSON.parse(jsonStr);
obj['theTeam'].push({"teamId":"4","status":"pending"});
jsonStr = JSON.stringify(obj);
// "{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"},{"teamId":"4","status":"pending"}]}"

答案 1 :(得分:18)

var Str_txt = '{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}';

如果您想在最后位置添加,请使用代码

var parse_obj = JSON.parse(Str_txt);
parse_obj['theTeam'].push({"teamId":"4","status":"pending"});
Str_txt = JSON.stringify(parse_obj);
Output //"{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"},{"teamId":"4","status":"pending"}]}"

并且,如果您想添加第一个位置,请使用代码

var parse_obj = JSON.parse(Str_txt);
parse_obj['theTeam'].unshift({"teamId":"4","status":"pending"});
Str_txt = JSON.stringify(parse_obj);
Output //"{"theTeam":[{"teamId":"4","status":"pending"},{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}"

而且,任何人都想添加数组的某个位置然后尝试下面的代码

fruits['theTeam'].splice(2, 0, {"teamId":"4","status":"pending"});
Output //"{"theTeam":[{"teamId":"1","status":"pending"},{"teamId":"2","status":"member"},{"teamId":"4","status":"pending"},{"teamId":"3","status":"member"}]}"

上面的代码块在第二个元素之后添加一个元素。

答案 2 :(得分:1)

首先我们需要解析JSON对象,然后我们可以添加一个项目。

var str = '{"theTeam":[{"teamId":"1","status":"pending"},
{"teamId":"2","status":"member"},{"teamId":"3","status":"member"}]}';

var obj = JSON.parse(str);
obj['theTeam'].push({"teamId":"4","status":"pending"});
str = JSON.stringify(obj);

最后我们 JSON.stringify obj 回到json

答案 3 :(得分:1)

在我的情况下,我的JSON对象中没有任何现有的Array,因此我必须先创建array元素,然后再推送该元素。

  elementToPush = [1, 2, 3]
  if (!obj.arr) this.$set(obj, "arr", [])
  obj.arr.push(elementToPush)  

(此答案可能与该特定问题无关,但可能会有所帮助 别人)

答案 4 :(得分:0)

例如,这里有一个元素,如按钮,用于将项目添加到购物篮以及用于保存在localStorage中的相应属性。

'<a href="#" cartBtn pr_id='+e.id+' pr_name_en="'+e.nameEn+'" pr_price="'+e.price+'" pr_image="'+e.image+'" class="btn btn-primary"><i class="fa fa-shopping-cart"></i>Add to cart</a>'
  
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')};


  if(localStorage.getObj('product')!==null){
    productArray=localStorage.getObj('product');
    productArray.push(productJSON);  
    localStorage.setObj('product', productArray);  
  }
  else{
    productArray.push(productJSON);  
    localStorage.setObj('product', productArray);  
  }


});

Storage.prototype.setObj = function(key, value) {
    this.setItem(key, JSON.stringify(value));
}

Storage.prototype.getObj = function(key) {
    var value = this.getItem(key);
    return value && JSON.parse(value);
}

将JSON对象添加到Array结果后(在LocalStorage中):

[{“id”:“99”,“nameEn”:“Product Name1”,“price”:“767”,“image”:“1462012597217.jpeg”},{“id”:“93”, “nameEn”:“Product Name2”,“price”:“76”,“image”:“1461449637106.jpeg”},{“id”:“94”,“nameEn”:“Product Name3”,“price”: “87”, “图像”: “1461449679506.jpeg”}]

执行此操作后,您可以轻松地将数据作为Java中的List发送到服务器

完整的代码示例在这里

How do I store a simple cart using localStorage?