如何递归删除包含空数组的嵌套对象? [英] How do you recursively remove nested objects that contain an empty array?

问题描述

我最初收到{"B":{"1":"100","3":{"AA":256}},"A":100}的AJAX响应，并转换为javascript对象:

I initially receive an AJAX response of {"B":{"1":"100","3":{"AA":256}},"A":100} and converted to a javascript object:

var jsonOBJ = {};
jsonOBJ = jQuery.parseJSON(data);

未来的响应可以是初始响应的子集或超集.如果服务器上表的值未更改，则停滞数据将替换为空数组.示例:

Future responses can be subsets or supersets of the initial response. If the value of a table is unchanged at the server, the stagnant data is replaced with an empty array. Example:

{"B":{"1":"90","2":200,"3":[]}}

{"B":[],"A":20}

每次收到AJAX响应时，对象都会更新为:

Everytime an AJAX response is received, the object is updated with:

jQuery.extend(true, jsonOBJ, jQuery.parseJSON(data));

但是我需要javascript对象来保留未更改的部分，因此我需要在上面的示例响应中得到一个等效于以下内容的对象:

But I need the javascript object to keep the unchanged portions, so I need to end up with an object that would be equivalent to the following with the example responses above:

jsonOBJ = jQuery.parseJSON('{"B":{"1":"90","2":200,"3":{"AA":256}},"A":20}');

我的首选方法是从转换后的响应中删除空对象.是否有现有功能或对jQuery扩展功能的修改可以做到这一点?

My preferred option would be to remove the empty objects from the converted response. Is there an existing function or a modification to the jQuery extend function that would do this?

推荐答案

您可以使用此代码删除响应中带有空数组的元素.

You can remove the elements in your response with empty arrays with this code.

它循环遍历顶层，查找任何空数组并将其删除.它找到的所有对象都会递归到其中，也要删除其中的空数组:

It cycles through the top level, looking for any empty arrays and removing them. Any objects it finds, it recurses into to also remove empty arrays in them:

// make sure the ES5 Array.isArray() method exists
if(!Array.isArray) {
  Array.isArray = function (arg) {
    return Object.prototype.toString.call(arg) == '[object Array]';
  };
}

function removeEmptyArrays(data) {
    for (var key in data) {
        var item = data[key];
        // see if this item is an array
        if (Array.isArray(item)) {
            // see if the array is empty
            if (item.length == 0) {
                // remove this item from the parent object
                delete data[key];
            }
        // if this item is an object, then recurse into it 
        // to remove empty arrays in it too
        } else if (typeof item == "object") {
            removeEmptyArrays(item);
        }
    }    
}

var jsonOBJ = {};
jsonOBJ = jQuery.parseJSON(data);
removeEmptyArrays(jsonOBJ);

您可以在这里看到它的工作: http://jsfiddle.net/jfriend00/U6qMH/

You can see it work here: http://jsfiddle.net/jfriend00/U6qMH/

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