Escaping single quotes in JavaScript string for JavaScript evaluation

Question

I have a project, in which some JavaScript var is evaluated. Because the string needs to be escaped (single quotes only), I have written the exact same code in a test function. I have the following bit of pretty simple JavaScript code:

function testEscape() {     var strResult = "";     var strInputString = "fsdsd'4565sd";      // Here, the string needs to be escaped for single quotes for the eval      // to work as is. The following does NOT work! Help!     strInputString.replace(/'/g, "''");      var strTest = "strResult = '" + strInputString + "';";     eval(strTest);     alert(strResult); } 

And I want to alert it, saying: fsdsd'4565sd.

Answer 1

The thing is that .replace() does not modify the string itself, so you should write something like:

strInputString = strInputString.replace(... 

It also seems like you're not doing character escaping correctly. The following worked for me:

strInputString = strInputString.replace(/'/g, "\\'");