How to return a value from script when using chrome.tabs.executeScript

[Ben Bracha]

Hi,

I have a simple script file - myScript.js:

(function main() { return 1; })();

I would expect that when running it with chrome.tabs.executeScript (giving it the "file" parameter) that I will receive a result of "1". But I get empty results.

When I run this command on console I get back "1".

Any idea how to return a value from script run by chrome.tabs.exectueScript ?

Thanks

[Nihal Titan]

Here's some logic I'm using to run a function in a tab and get the results (single value).

let myResults = await scriptWait(myTabID,myFunction);

async function scriptWait(target, runfunc)
    {
    return new Promise((resolve, reject) =>
        {
        try
            {
            if(!target?.tabId) { resolve(); }
            chrome.scripting.executeScript(
                {
                target : target,
                func : runfunc
                },
            function (result)
                {
                if(result)
                    {
                    resolve(result[0].result);
                    }
                resolve();
                });
            }
        catch {resolve();}
       
        });
    }

[Ben Bracha]

You are using the chrome.scripting api which is from v3

I’m using v2 and other api 

[Ben Bracha]

It seems to work if I use a simple script. But if my script is a webpack module, it doesn't work - no return value.

Does anyone have experience with this?

[wOxxOm]

You can use webpack's DefinePlugin to add a footer like `;window.result` so that it becomes the last code in the output file and in your own code you'll set it like window.result = 'foo'

Note that this works only for synchronous code, so if you use Promise or any other asynchronously running code you'll need to use chrome messaging to send the result.

[wOxxOm]

Oops, not DefinePlugin but wrapper-webpack-plugin or a similar one.

[Ben Bracha]

That seem to work well

Thank you very much