What is the process for executing JavaScript code that is stored as a string?

Question

What is the process for executing JavaScript code that is stored as a string?

After making an AJAX call, I receive a random string (constructed dynamically on the server) that contains JavaScript code like:

Plugins.add('test', function()
 { 
        return
            {
                html: '<div>test</div>',//EDITED
                width: 200
            }
 });//EDITED

I want to be able to execute this code on the client side. I attempted to use the eval function in this way:

eval("(" + str + ")");

However, I encountered an error. After removing all instances of "\r\n" and eliminating the last ";" (semicolon), the eval function was successful. But, if I include any comments in the code above, the eval function fails.

Is there a way for me to successfully run the code from the string?

javascript

Answer 1

Answer №1

Simply delete those brackets:

execute(str);

If there was a mistake in your inquiry and the server is actually sending the missing closing bracket and comma within the item:

Modules.insert('example', function()
 { 
        return {
                content: '<span>example</span>',  // <-- the comma was omitted
                height: 150
        };
 }
);   // <-- was forgotten

Keep in mind that utilizing execute() is perceived as risky because it can be very hazardous.

Answer 2

Simply delete those brackets:

execute(str);

If there was a mistake in your inquiry and the server is actually sending the missing closing bracket and comma within the item:

Modules.insert('example', function()
 { 
        return {
                content: '<span>example</span>',  // <-- the comma was omitted
                height: 150
        };
 }
);   // <-- was forgotten

Keep in mind that utilizing execute() is perceived as risky because it can be very hazardous.

Answer 3

Answer №2

Executing a new function with the input string as an argument.

You can also use the same method for JSON data:

Executing a new function that returns the input string concatenated after 'return'.

If this solution serves your purpose better than using eval, feel free to use it. However, keep in mind that it has similar risks like eval does.

Answer 4

Executing a new function with the input string as an argument.

You can also use the same method for JSON data:

Executing a new function that returns the input string concatenated after 'return'.

If this solution serves your purpose better than using eval, feel free to use it. However, keep in mind that it has similar risks like eval does.

Answer 5

Answer №3

Your object literal is missing a comma. When Return is on its own line, it will just exit the function. To properly return the object, you should specify the return value on the same line.

Plugins.add('test', function() { 
   var ret =   {
                html: '<div>test</div>',
                width: 200,
            };     
   return ret;

 };

Answer 6

Your object literal is missing a comma. When Return is on its own line, it will just exit the function. To properly return the object, you should specify the return value on the same line.

Plugins.add('test', function() { 
   var ret =   {
                html: '<div>test</div>',
                width: 200,
            };     
   return ret;

 };

Answer 7

Answer №4

To send back your string using the content type "text/javascript" or "application/x-javascript" will result in the JavaScript code being executed immediately upon return.

Answer 8

To send back your string using the content type "text/javascript" or "application/x-javascript" will result in the JavaScript code being executed immediately upon return.

What is the process for executing JavaScript code that is stored as a string?

Answer №1

Answer №2

Answer №3

Answer №4

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