how to escape special characters within eval using javascript?

Question

var input;

// method 1
input = document.getElementById('address').value;
alert(input)

// method 2
eval('input = "'+document.getElementById('address').value+'"')
alert(input)

method 1 is working fine, but method 2 is not working when newline characters are inputted and it says "unterminated string literal".

I need to store values using eval anyway. So please help me.

Aaron Digulla · Accepted Answer · 2010-09-30 11:48:08Z

4

Use string.replace(/\r?\n/g, "\\n") to escape the newlines.

answered Sep 30, 2010 at 11:48

Aaron Digulla

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Comments

ChrisR · Accepted Answer · 2010-09-30 11:43:48Z

1

That's because you are actually evaluating code that looks like this, which is ofcourse wrong in javascript

var test = "Lorem ipsum
    dolor sit amet";

Why do you need the eval? It looks not really necessary in this case. Maybe we can help you get around the eval?

answered Sep 30, 2010 at 11:43

ChrisR

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Comments

Zmey · Accepted Answer · 2019-11-28 23:16:20Z

0

Try:

   const address = document.getElementById('address').value
   eval('input = ' + JSON.stringify(String(address)))

String(address) will guarantee that the object is a string. JSON.stringify will return a double quoted string parsable with eval.

answered Nov 28, 2019 at 23:16

Zmey

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