puppeteer/third_party/phantomjs/examples/pagecallback.js

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"use strict";
var p = require("webpage").create();
p.onConsoleMessage = function(msg) { console.log(msg); };
// Calls to "callPhantom" within the page 'p' arrive here
p.onCallback = function(msg) {
console.log("Received by the 'phantom' main context: "+msg);
return "Hello there, I'm coming to you from the 'phantom' context instead";
};
p.evaluate(function() {
// Return-value of the "onCallback" handler arrive here
var callbackResponse = window.callPhantom("Hello, I'm coming to you from the 'page' context");
console.log("Received by the 'page' context: "+callbackResponse);
});
phantom.exit();