Question

I have a json object retrieved from server in my $(document).ready(...); that has an string that I would like to resolve to a function also defined within $(document).ready(...); so, for example:

$(document).ready(function{

    $.getJSON(/*blah*/,function(data){/*more blah*/});
    function doAdd(left,right) {
        return left+right;
    }
    function doSub(left,right) {
        return left-right;
    }
});

with json string:

{"doAdd":{"left":10,"right":20}}

One way I thought about was creating an associative array of the function before loading the json:

var assocArray=...;
assocArray['doAdd'] = doAdd;
assocArray['doSub'] = doSub;

Using eval or window[](); are no good as the function may not be called for some time, basically I want to link/resolve but not execute yet.

Answer 1

Change your JSON to

{method: "doAdd", parameters : {"left":10,"right":20}}

Then do

var method = eval(json.method); 
// This doesn't call it. Just gets the pointer

Or (haven’t tried this)

var method = this[json.method]