Documentation
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Overview ¶
Command exposefunc is a chromedp example demonstrating how to call Go functions from a page with chromedp.ExposeFunc. The action makes a Go function available as window.<name>, and a script of the page calls it like an async function that returns a promise. The program exposes four functions. The first gets an object and returns an object, with a lookup in a Go map. The second gets several arguments and returns a number. The third returns a Go error, so the promise rejects and the script catches it. The fourth is slow, and the page calls it five times at the same time. The program then navigates to a page with an iframe, and shows that the functions are still there, in the page and in the iframe. For each call it prints what the page got. It starts a local server and needs no internet. Use -v to print the protocol messages and -visible to show the browser window and leave it open. Use -visible-on-terminal to draw the page in the terminal with terminal graphics.
Source Files