I have a variable (string) in Javascript, in which you for example have this text:
"document.getElementById('tekst').innerHTML = 'Probeer opnieuw!';"
I got this variable using Ajax and PHP, but that is not where my (possibly very easy) question is about.
Say I want to use this code as code itself, not as a string, so instead of this being a string I would like the code inside of it to be executed.
How can I possibly do this?
Thanks in advance
Don't do this. It's a security nightmare.
If you really must do this, use eval() as in:
eval("document.getElementById('tekst').innerHTML = 'Probeer opnieuw!';");
Considering your example and explanation, I suspect that you are retrieving a url whose contents consist entirely of javascript. The problem you've run across is that the method you are using to retrieve that url gives you a string containing that javascript. I believe that it's intended for you to instead use a <script> element to load that code. To do so dynamically:
var script = document.createElement("script");
script.src = "url/to/your/javascript";
document.getElementByTagName('body')[0].appendChild(script);
You can use the eval() method. But don't do it if you don't have to. And if you do have to, make sure you know what you're doing.
eval("document.getElementById('tekst').innerHTML = 'Probeer opnieuw!';")
Here is an alternative to using eval() :
var stringContainingJavascript = "document.getElementById('tekst').innerHTML = 'Probeer opnieuw!';"
var body = document.getElementsByTagName('body')[0];
var paragraph = document.createElement('p');
paragraph.id = 'tekst';
body.appendChild(paragraph);
var script = document.createElement('script');
var scriptText = document.createTextNode(stringContainingJavascript);
script.appendChild(scriptText);
body.appendChild(script);
The script above creates a <p> element and gives it id="tekst", before appending the <p> to the <body> of the document.
The same script then creates a <script> element and appends the string to it, before appending the <script> to the <body> of the document.
