使用点分隔字符串获取对象嵌套属性 [英] Get Object nested property using dot separated string

问题描述

Flex中是否有任何实用程序可以使用点分隔的字符串来获取对象嵌套的属性，如下所示:

Is there in Flex any utility to get object nested property using dot separated string like this:

SomeUtil.getObjectProperty(object, "child.property");

推荐答案

假设对象是动态对象，您可以自己滚动:

You can roll your own, assuming object is a dynamic object :

public function getObjectProperty(object:Object, property:String):Object
{
    var parts:Array = property.split(".");
    if(parts && parts.length == 2 && object && object[parts[0]] && object[parts[0]][parts[1]])
    {
         return object[parts[0]][parts[1]];
    }
    return null;
} 

这是另一种可以使用不同字符串的方法:

Here is another one that will work with different strings :

private function test(e:Event = null):void 
{

    var obj:Object = { 
        "child": { 
            "property":1
         },
         "anotherproperty": 2
    };

    var test1:Object = getObjectProperty(obj, "anotherproperty");
    var test2:Object = getObjectProperty(obj, "child.property");
}

public function getObjectProperty(object:Object, property:String):Object
{
    var parts:Array = property.split(".");
    var returnProp:Object = null;

    for (var i:int = 0; i < parts.length; i++) 
    {
         if(object[parts[i]]) 
         {             
             returnProp = object[parts[i]];
             object = returnProp;
         } 
         else
             return null;
    }

    return returnProp;
}

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