Question

I’m building a json object in java. I need to pass a function into my javascript and have it validated with jquery $.isFunction(). The problem I’m encountering is I have to set the function in the json object as a string, but the json object is passing the surrounding quotes along with object resulting in an invalid function. How do I do this without having the quotes appear in the script.

Example Java

JSONObject json = new JSONObject();
json.put("onAdd", "function () {alert(\"Deleted\");}");

Jquery Script

//onAdd output is "function () {alert(\"Deleted\");}" 
//needs to be //Output is function () {alert(\"Deleted\");} 
//in order for it to be a valid function.
if($.isFunction(onAdd)) { 
    callback.call(hidden_input,item);
}

Any thoughts?

Answer 1

Running

onAdd = eval(onAdd);

should turn your string into a function, but it’s buggy in some browsers.

The workaround in IE is to use

onAdd = eval("[" + onAdd + "]")[0];

See Are eval() and new Function() the same thing?