如何从dojo存储的项数组中删除对象

Question

我有一个有序的商店，我正在使用过滤选择，我需要从商店中删除一个商品，如何知道这一点 数组中的对象只有两个属性VALUE和LABEL，

商店就像：

{
    "items":
        [
            {
                "VALUE":"AG",
                "LABEL":"Agriculture"
            },
            {
                "VALUE":"CE",
                "LABEL":"Construction"
            },
            {
                "VALUE":"CO",
                "LABEL":"Consumer"
            }
        ],
    "identifier":"VALUE"
}

我想删除项目数组中的一个对象。

Answer 1

有几种方法可以通过示例从数组中删除obj及其安静简单：

1. Native JS

使用Array.splice：

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var json = {"items":[{"VALUE":"AG","LABEL":"Agriculture"},{"VALUE":"CE","LABEL":"Construction"},{"VALUE":"CO","LABEL":"Consumer"},
{"VALUE":"CD","LABEL":"CDsample"},
{"VALUE":"AL","LABEL":"Aluminium"}],"identifier":"VALUE"}

var array = json.items;
var valueToRemove = "CD";

json.items.forEach(function(element,index){
  if(element["VALUE"] == valueToRemove)
    json.items.splice(index, 1);
});

console.log(json);
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使用Array.filter

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var json = {"items":[{"VALUE":"AG","LABEL":"Agriculture"},{"VALUE":"CE","LABEL":"Construction"},{"VALUE":"CO","LABEL":"Consumer"},
    {"VALUE":"CD","LABEL":"CDsample"},
    {"VALUE":"AL","LABEL":"Aluminium"}],"identifier":"VALUE"}
//get the array from
var array = json.items;
var valueToRemove = "CD";
json.items = json.items.filter(function(element) {
    return element["VALUE"] !== valueToRemove;
});

console.log(json);
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1. 使用Dojo

使用Array.map：

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require(["dojo/_base/array"],function(Array){
  var json = {"items":[{"VALUE":"AG","LABEL":"Agriculture"},{"VALUE":"CE","LABEL":"Construction"},{"VALUE":"CO","LABEL":"Consumer"},
  {"VALUE":"CD","LABEL":"CDsample"}, {"VALUE":"AL","LABEL":"Aluminium"}],"identifier":"VALUE"};


  var valueToRemove = "CD";
  //get index of element
  var index = Array.map(json.items, function(item){
    return item["VALUE"];
  }).indexOf(valueToRemove);
  //remove elemnt at that index
  json.items.splice(index,1);

  console.log(json);
})
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<script src="//ajax.googleapis.com/ajax/libs/dojo/1.10.4/dojo/dojo.js"></script>
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使用Array.filter：

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require(["dojo/_base/array"],function(Array){
  var json = {"items":[{"VALUE":"AG","LABEL":"Agriculture"},{"VALUE":"CE","LABEL":"Construction"},{"VALUE":"CO","LABEL":"Consumer"},
  {"VALUE":"CD","LABEL":"CDsample"}, {"VALUE":"AL","LABEL":"Aluminium"}],"identifier":"VALUE"};


  var valueToRemove = "CD";
 
 //filter
  json.items = Array.filter(json.items, function(item){
    return item["VALUE"] != valueToRemove;
  });

  console.log(json);
})
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<script src="//ajax.googleapis.com/ajax/libs/dojo/1.10.4/dojo/dojo.js"></script>
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使用Array.forEach：

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require(["dojo/_base/array"],function(Array){
  var json = {"items":[{"VALUE":"AG","LABEL":"Agriculture"},{"VALUE":"CE","LABEL":"Construction"},{"VALUE":"CO","LABEL":"Consumer"},
  {"VALUE":"CD","LABEL":"CDsample"}, {"VALUE":"AL","LABEL":"Aluminium"}],"identifier":"VALUE"};


  var valueToRemove = "CD";


  Array.forEach(json.items, function(item,index){
    if(item)
      if(item["VALUE"] == valueToRemove)
        json.items.splice(index,1);

  });

  console.log(json);
})
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<script src="//ajax.googleapis.com/ajax/libs/dojo/1.10.4/dojo/dojo.js"></script>
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