string as object reference to object variable

var string = 'object.data.path';

Th开发者_如何学JAVAat's a string that resembles a path to variable.

How can I return the corresponding variable from that string?

Something like transforming the string into return object.data.path;

The thing behind this is that the string could be much longer (deeper), like:

var string = 'object.data.path.original.result';

---

function GetPropertyByString(stringRepresentation) {
    var properties = stringRepresentation.split("."),
        myTempObject = window[properties[0]];
    for (var i = 1, length = properties.length; i<length; i++) {
    myTempObject = myTempObject[properties[i]];
    }

    return myTempObject;
}


alert(GetPropertyByString("object.data.path"));

this assumes that your first level object (in this case called object is global though. Alternatively, although not recommended, you could use the eval function.

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Assuming you don't want to just use eval you could try something like this:

function stringToObjRef(str) {
   var keys = str.split('.'),
       obj = window;
   for (var i=0; i < keys.length; i++) {
      if (keys[i] in obj)
         obj = obj[keys[i]];
      else
         return;
   }

   return obj;
}

console.log(stringToObjRef('object.data.path.original.result'));

Uses a for loop to go one level down at a time, returning undefined if a particular key in the chain is undefined.