Javascript 如何检查 JSON 对象数组是否包含数组中定义的值？

How to check if the JSON Object array contains the value defined in an arrary or not?

提问by Kiran Shahi

I have the following JSON data.

我有以下 JSON 数据。

categories = [
    {catValue:1, catName: 'Arts, crafts, and collectibles'},
    {catValue:2, catName: 'Baby'},
    {catValue:3, catName: 'Beauty and fragrances'},
    {catValue:4, catName: 'Books and magazines'},
    {catValue:5, catName: 'Business to business'},
    {catValue:6, catName: 'Clothing, accessories, and shoes'},
    {catValue:7, catName: 'Antiques'},
    {catValue:8, catName: 'Art and craft supplies'},
    {catValue:9, catName: 'Art dealers and galleries'},
    {catValue:10, catName: 'Camera and photographic supplies'},
    {catValue:11, catName: 'Digital art'},
    {catValue:12, catName: 'Memorabilia'}
];

var categoriesJson = JSON.stringify(categories);

And following array.

和以下数组。

var mainCat = ['Arts, crafts, and collectibles', 'Baby' , 'Antiques']

While looping the JSON data I need to check if the Object value is listed in an array or not. If the yes do something else do another thing.

在循环 JSON 数据时，我需要检查 Object 值是否列在数组中。如果是，做别的事情做另一件事。

For example

例如

$.each(categoriesJson , function (key, value) {
    if(value.catName is in array) {
        //do something here 
    } else {
        //do something here
    }
});

How can I achieve this?

我怎样才能做到这一点？

采纳答案by Mamun

Try the following:

请尝试以下操作：

var categories = [
    {catValue:1, catName: 'Arts, crafts, and collectibles'},
    {catValue:2, catName: 'Baby'},
    {catValue:3, catName: 'Beauty and fragrances'},
    {catValue:4, catName: 'Books and magazines'},
    {catValue:5, catName: 'Business to business'},
    {catValue:6, catName: 'Clothing, accessories, and shoes'},
    {catValue:7, catName: 'Antiques'},
    {catValue:8, catName: 'Art and craft supplies'},
    {catValue:9, catName: 'Art dealers and galleries'},
    {catValue:10, catName: 'Camera and photographic supplies'},
    {catValue:11, catName: 'Digital art'},
    {catValue:12, catName: 'Memorabilia'}
];

var categoriesJson = JSON.stringify(categories);
var mainCat = ['Arts, crafts, and collectibles', 'Baby' , 'Antiques']

$.each(JSON.parse(categoriesJson) , function (key, value) {
  if(mainCat.indexOf(value.catName) > -1){
   console.log('Exists: ' +value.catName)
 }
 else{
   console.log('Does not exists: ' +value.catName)
 }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

回答by dhilt

I would filterthe initial data array to get the array of matching categories:

我将过滤初始数据数组以获取匹配类别的数组：

var matchedCategories = categories.filter(i => mainCat.indexOf(i.catName) >= 0);

Then you could do what you need by iterating this sub-array.

然后你可以通过迭代这个子数组来做你需要的。

回答by Neter

I also use @dhiltapproach but with includes

我也使用@dhilt方法但包含

ex. If even one is included (return bool)

前任。如果甚至包括一个（返回布尔值）

  categories.filter(i =>
    mainCat.includes(i.catName)
  ).length > 0
    ? true
    : false;