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

User · Answer

var str   quot fsdsd 4565sd quot   str replace    g  quot   quot   This worked for me  Kindly try this

User · Answer

strInputString   strInputString replace    g

User · Answer

Only this worked for me   searchKeyword replace    g            searchKeyword contains  d av    So  the result variable will contain  d  av    I don t know why with the RegEx didn t work  maybe because of the JS framework that I m using  Backbone js

User · Answer

There are two ways to escaping the single quote in JavaScript  1- Use double-quote or backticks to enclose the string  Example   quot fsdsd 4565sd quot  or  fsdsd 4565sd   2- Use backslash before any special character  In our case is the single quote Example strInputString   strInputString replace      g   quot       quot    Note  use a double backslash  Both methods work for me

User · Answer

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

User · Answer

That worked for me  string address senderAddress Replace  quot   quot    quot     quot

User · Answer

I agree that this var formattedString   string replace    g          works very well  but since I used this part of code in PHP with the framework Prado  you can register the js script in a PHP class  I needed this sample working inside double quotes    The solution that worked for me is that you need to put three   and escape the double quotes   var string     l avancement    var formattedString   string replace    g               I answer that question since I had trouble finding that three   was the work around

User · Answer

Best to use JSON stringify   to cover all your bases  like backslashes and other special characters   Here s your original function with that in place instead of modifying strInputString   function testEscape         var strResult           var strInputString    fsdsd 4565sd        var strTest    strResult       JSON stringify strInputString             eval strTest       alert strResult        This way your strInputString could be something like             abc   and it will still work fine    Note that it adds its own surrounding double-quotes  so you don t need to include single quotes anymore

[javascript] Escaping single quotes in JavaScript string for JavaScript evaluation

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