puppeteer/third_party/phantomjs/examples/injectme.js

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// Use 'page.injectJs()' to load the script itself in the Page context
"use strict";
if ( typeof(phantom) !== "undefined" ) {
var page = require('webpage').create();
// Route "console.log()" calls from within the Page context to the main Phantom context (i.e. current "this")
page.onConsoleMessage = function(msg) {
console.log(msg);
};
page.onAlert = function(msg) {
console.log(msg);
};
console.log("* Script running in the Phantom context.");
console.log("* Script will 'inject' itself in a page...");
page.open("about:blank", function(status) {
if ( status === "success" ) {
console.log(page.injectJs("injectme.js") ? "... done injecting itself!" : "... fail! Check the $PWD?!");
}
phantom.exit();
});
} else {
alert("* Script running in the Page context.");
}