I have a function:
var greet = function (name) {
console.log("Hi " + name);
}
If I have a string "greet('eric')" is it possible to convert it to a function call passing "eric" as argument?
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5 Answers
eval() is your friend ! http://www.w3schools.com/jsref/jsref_eval.asp
4 Comments
ajsie
Oh totally forgot eval(). Isn't it the other way around, its evil?
Peter Olson
@weng Eval is only evil if you misuse it
Zirak
The call of a thousand screaming virgins tearing at their flesh accompany your answer.
KooiInc
W3Schools bashing seems to be fashionable nowadays. They may be wrong in many aspects, but in their days (w3schools started in 1999) they were a great source of information to many. Maybe they'll catch up someday.
You, me, him her and them fWord('ing') hate eval. There's always another way.
callMethod = function(def) {
//all the variables are function references
var approvedMethods = {greet: greet, love: love, marry: marry, murder: murder, suicide: suicide},
split = def.split(/\(/); //split[0] contains function name, split[1] contains (unsplit) parameters
//replace last ) and all possible string detonators left-over
split[1] = split[1].replace(/\)$/, '').replace(/[\'\"]/g, '').split(','); //contains list of params
if (!approvedMethods[split[0]])
return 'No such function.';
approvedMethods[split[0]].apply(window, split[1]);
}
//Called like this:
callMethod("greet('eric')");
Replace window reference with whatever.
Comments
I'm not sure I've understood your question correctly, but are you looking for the eval() function?
eval("greet('eric')");
Comments
It is as easy as typing
eval("greet('eric')");
Comments
without eval
var greet = function (name) {
console.log("Hi " + name);
},
greetstr = 'greet("Eric")';
var greeter = greetstr.split('("');
window[greeter[0]]( greeter[1].replace(/\)|"/g,'') );
Bottom line 1: use eval with care
Bottom line 2: avoid constructions like this.
Just to be sure you have all possibilities @ your disposal: setTimeout(greetstr,0);
Mmmm, there is an eval in there somewhere ;)
1 Comment
ajsie
I guess eval() indeed is my friend in this case=)