Javascript function inside of string, how to add it to javascript to be called on for later

Question

I have been trying to figure this out for a while, and I cannot wrap my head around how to do this. I dynamically created a function composed of different strings, and I would like to be able to turn this into actual javascript that can be called on.

I simplified this example but it still should help solve my problem.

var previewStringFunction = "function updateMap() {"
 + "some javascript code" + "}"

Why are you creating a function out of strings? You can eval it but it's bad practice. — elclanrs
– elclanrs, Commented Mar 4, 2013 at 6:47
its part an application that allows people to see the script they are creating and I want to be able to execute it — user1551909
– user1551909, Commented Mar 4, 2013 at 6:51
possible duplicate of Calling a function by a string in JavaScript and staying in scope — Samuel Liew
– Samuel Liew, Commented Mar 4, 2013 at 6:52

arjuncc · Accepted Answer · 2013-03-04 06:52:14Z

3

You can use The eval() function for evaluating.

sample:

var strng = "function executeThs(){  alert('hello world'); }";// your string
eval(s);// evaluation of your function
executeThs();// calling function

http://www.w3schools.com/jsref/jsref_eval.ASP

answered Mar 4, 2013 at 6:52

arjuncc

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Mikhail Vladimirov · Accepted Answer · 2013-03-04 07:00:00Z

0

<html>
  <head>
    <script language="javascript">
<!--
function foo ()
{
  var script = document.createElement ('script');
  script.innerHTML = "function bar () {alert ('bar');}";
  body.appendChild (script);
}
// -->
    </script>
  </head>
  <body id="body">
    <input type="button" onclick="foo(); return false;" value="foo" />
    <input type="button" onclick="bar(); return false;" value="bar" />
  </body>
</html>

Button foo defines function, button bar calls it.

answered Mar 4, 2013 at 7:00

Mikhail Vladimirov

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